CA2424694C - Power system for a telecommunication facility - Google Patents

Power system for a telecommunication facility Download PDF

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Publication number
CA2424694C
CA2424694C CA 2424694 CA2424694A CA2424694C CA 2424694 C CA2424694 C CA 2424694C CA 2424694 CA2424694 CA 2424694 CA 2424694 A CA2424694 A CA 2424694A CA 2424694 C CA2424694 C CA 2424694C
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Canada
Prior art keywords
fuel
power
electrical power
rectifier
proton exchange
Prior art date
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CA 2424694
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French (fr)
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CA2424694A1 (en
Inventor
Larry L. Johnson
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Sprint Communications Co LP
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Sprint Communications Co LP
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J9/00Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/02Conversion of ac power input into dc power output without possibility of reversal
    • H02M7/04Conversion of ac power input into dc power output without possibility of reversal by static converters
    • H02M7/06Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes without control electrode or semiconductor devices without control electrode
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B90/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02B90/10Applications of fuel cells in buildings
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/40Fuel cell technologies in production processes

Abstract

A power system specifically designed to provide reliable electrical power to a telecommunication facility is disclosed. The system includes a number of microturbine generators adapted to provide AC power that is then rectified to DC power by an array of rectifiers. The system is configured so that the microturbine generators are fueled initially by utility-supplied natural gas. In the event the utility-supplied natural gas fails, the system provides propane from a storage tank to fuel the microturbine generators. If both microturbine generator fuel sources fail or their fuel supply becomes exhausted, power is supplied to the rectifiers by a commercial electrical utility. The system also includes a number of hydrogen-powered proton exchange membranes that are operable to supply DC power directly to the facility if both the microturbine generators and the electrical utility fail. Finally, a number of super capacitors are coupled to the bus line directly connected to the facility in order to maintain power if it becomes necessary to switch power sources.

Description

EXPRESS MAIL NO: EL800840832U5 POWER SYSTEM FOR A TELECOMMUNICATION FACILITY
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] None.
STATEMENT REGARDING FEDERALLY
SPONSORED RESEARCH OR DEVELOPMENT
[0002] Not applicable.
BACKGROUND OF THE INVENTION
[0003] In general, this invention relates to a system for providing electrical power. More specifically, this invention is directed to a system particularly adapted to provide reliable electrical power for the operation of a remote telecommunications facility.
[00041 Although it may be utilized in numerous applications, this invention is specifically adapted to provide power for the continuous operation of a remote telecommunications facility.
With its core technology substantially composed of digital components, the telecommunications industry is heavily dependent on the continued supply of reliable electrical power. The critical nature of the functions performed by remote telecommunications facilities further emphasizes the need for a dependable power supply.
[0005] Most telecommunications facilities rely on a commercial power utility for electrical power and employ traditional devices, such as a transformer and switchgear, to safely receive and use the electrical power. To insure the facility's power supply is not interrupted, such as in the case of a black-out or other disturbance in the commercial power system, many telecommunications facilities have a system for providing backup power. Although various designs are used, many 1162978.1 Page 1 of 19 backup systems employ a diesel generator and an array of batteries. If power from the commercial utility is lost, the diesel generator takes over to supply power, and the battery array insures that power is maintained during the time it takes to switch from utility-supplied power to generator-supplied power. If the generator also fails, such as due to a mechanical malfunction or to the depletion of its fuel source, then the battery array is able to provide power for an additional period of time.
[0006] There are several disadvantages inherent in the current manner in which power is supplied to telecommunications facilities. First, the cost of local electrical utility service has risen dramatically in recent years and, by all accounts, will continue to rise.
Thus, the cost of local electrical utility power is a large component of the facility's overall power expenses. Next, as the facility's power demands have increased, the number of batteries required to provide an adequate amount of power for a reasonable period of time has also increased. Clearly, the component cost of the system increases with the greater number of batteries required. In addition, the greater number of batteries required has significantly increased the space required to house the backup system, which has increased the spacial cost of the systems. Finally, it is known that generators suffer from certain reliability problems, such as failing to start when needed because of disuse or failed maintenance.
Therefore, the reliability of the backup systems could be improved.
[0007] The power system of the present invention overcomes these disadvantages by providing reliable electrical power that is not initially dependent on a commercial electrical utility and that does not employ an array of batteries. The system, therefore, is more cost efficient and requires less space than the present manner of providing power to facilities.
The invention employs redundant sources of power, and thus, is uninterruptible. Also, the system employs power generating components that have less of an impact on the environment than the current manner in which power 1162978.1 Page 2 of 19 is supplied. Moreover, the system may be constructed at a manufacturing site and then moved to the facility. Thus, the system of the present invention provides power to a telecommunications facility in a manner that is less expensive, that requires less space, that is movable, and that is environmentally friendly.
BRIEF SUMMARY OF THE INVENTION
[0007a] According to one aspect of the present invention, there is provided a power supply system for providing reliable electrical power to a telecommunications facility, said facility containing telecommunications equipment, said system comprising: a primary fuel line that supplies a primary fuel from a commercial utility; a backup fuel line that supplies a backup fuel from a backup fuel source; a microturbine generator operable to produce AC
electrical power that is coupled to said primary fuel line and said backup fuel line, wherein said microturbine generator is selectably powered by either said primary fuel from said commercial utility or said backup fuel; a control mechanism that selects said primary fuel to power said microturbine generator when a flow of said primary fuel is above a predetermined value, and selects said backup fuel to power said microturbine generator when the flow of said primary fuel falls below the predetermined value; a rectifier operable to convert said AC
electrical power received from said microturbine generator to a first DC
electrical power adaptable to power said telecommunication equipment; a switching mechanism that receives AC electrical power from said microturbine generator and AC electrical power from a commercial power utility, wherein said switching mechanism is coupled with said rectifier, wherein said switching mechanism operates to provide AC electrical power from said microturbine generator to said rectifier so long as said AC electrical power from said microturbine generator remains above a predetermined value and to provide AC
electrical power from said commercial power utility to said rectifier when said AC
electrical power from said microturbine generator falls below said predetermined value; at least one proton exchange membrane that is operable to produce a second DC electrical power adaptable to power said telecommunication equipment when said first DC electrical power is unavailable, said at least one proton exchange membrane adapted to be powered by a fuel; a proton exchange membrane fuel line containing a fuel valve; a proton exchange membrane fuel control operable to open said fuel valve in said proton exchange membrane fuel line when the AC electrical power provided to said rectifier falls below a predetermined value; at least one capacitor coupled to an output of said at least one rectifier.
[000711 According to another aspect of the present invention, there is provided a power supply system for providing reliable electrical power to a telecommunications facility, said facility containing telecommunications equipment, said system comprising: a first AC power source that operates from one of a plurality of fuels that include a fuel from a commercial utility and a locally-stored backup fuel, wherein the one fuel is selected based on an availability of the plurality of fuels and a predetermined selection order of available fuels, such that the fuel from the commercial utility is selected as the one fuel while the fuel from the commercial utility is available and the locally-stored backup fuel is selected as the one fuel when the primary fuel becomes unavailable; a rectifier that operates to convert AC
electrical power from one of a plurality of AC power sources to a first DC
electrical power, wherein said first DC electrical power is adapted to power said telecommunications equipment, and wherein said plurality of AC power sources includes said first AC power source and a second AC power source, wherein said one AC power source is selected based on an availability of said plurality of AC power sources and a predetermined selection order of available AC power sources, wherein said first AC power source and said second AC
power source are connected to a switching mechanism, wherein when said first AC power source is selected, said switching mechanism supplies power from said first AC
power source to said rectifier, and wherein when said second AC power source is selected, said switching mechanism provides power from said second AC power source to said rectifier;
at least one proton exchange membrane that is operable to produce a second DC electrical power adaptable to power said telecommunications equipment when said first DC
electrical power is unavailable, said at least one proton exchange membrane adapted to be powered by a fuel; and at least one capacitor coupled to the output of said at least one proton exchange membrane.
[0007c] According to still another aspect of the present invention, there is provided a power supply system for providing reliable electrical power to a telecommunications facility, said facility containing telecommunications equipment, said system comprising:
a first fuel 3a line containing a first fuel valve and a second fuel line containing a second fuel valve, wherein both said first fuel line and said second fuel line are coupled to a microturbine generator; said microturbine generator operable to produce AC electrical power that is selectably powered by either a first fuel from said first fuel line or a second fuel from said second fuel line, wherein said microturbine generator is normally selected to be powered by said first fuel; means for receiving AC electrical power from an electric utility; a rectifier operable to convert said AC
electrical power to DC electrical power adaptable to power said telecommunication equipment, wherein said rectifier receives said AC electrical power from either said microturbine generator or said electric utility, wherein said rectifier normally receives said AC
electrical power from said microturbine generator; at least one capacitor coupled to the output of said at least one rectifier; at least one proton exchange membrane that is operable to produce DC electrical power adaptable to power said telecommunication equipment, said at least one proton exchange membrane adapted to be powered by a third fuel, wherein said at least one proton exchange membrane operates when DC electrical power is unavailable from said rectifier; a first control means for selecting said microturbine generator to be powered by said a second fuel when a flow of said first fuel is insufficient; a second control means for switching said rectifier from said AC electrical power produced by said microturbine generator to said AC electrical power from said electric utility when said AC
electrical power produced by said microturbine generator is insufficient; and a third control means for switching from said DC electrical power produced by said rectifier to DC
electrical power produced by said at least one proton exchange membrane when said DC electrical power produced by said rectifier is insufficient.
[0007d] According to yet another aspect of the present invention, there is provided a method for supplying power to a telecommunications facility from a power supply system, said method comprising the following steps: providing a primary fuel from commercial utility to a microturbine generator, said microturbine generator operable to produce a first AC
electrical power, wherein said microturbine generator is capable of receiving fuel from both the commercial utility and a locally-stored backup fuel source; providing a backup fuel from said locally-stored backup fuel source to said microturbine generator if the flow of said fuel falls below a predetermined value; providing said first AC electrical power produced by said 3b microturbine generator to a rectifier, said rectifier operable to convert said first AC electrical power to DC electrical power; when said first AC electrical power falls below a predetermined value, providing a second AC electrical power from an electric utility to said rectifier; providing said DC electrical power from said rectifier to at least one capacitor; and providing said DC electrical power from said rectifier to said telecommunications facility.
[0007e] According to a further aspect of the present invention, there is provided a method for supplying power to a telecommunications facility from a power supply system, said method comprising the following steps: supplying one of a plurality of fuels to a first AC
power source, wherein said first AC power source operates from said one fuel, and wherein said one fuel is selected based on an availability of said plurality of fuels and a predetermined selection order of available fuels; supplying one of a plurality of AC power sources to a rectifier by way of a switch that selects between the AC power sources, wherein said rectifier operates to convert AC electrical power to a first DC electrical power, wherein said plurality of AC power sources includes said first AC power source, and wherein said one AC power source is selected based on an availability of said plurality of AC power sources and a predetermined selection order of available AC power sources; providing said first DC
electrical power to said telecommunications facility when said first DC
electrical power is available; providing fuel to at least one proton exchange membrane when said first DC
electrical power is unavailable, said at least one proton exchange membrane operable to produce a second DC electrical power; providing said second DC electrical power produced by said at least one proton exchange membrane to at least one capacitor; and providing said second DC electrical power produced by said at least one proton exchange membrane to said telecommunications facility when said first DC electrical power is unavailable.
[0008] Some embodiments of the present invention include a power system that is designed to provide reliable electrical power to a facility, and specifically to a telecommunications facility. The system includes a number of microturbine generators adapted to provide AC power. The system is configured so that the microturbine generators are fueled initially by natural gas supplied by a commercial utility. In the event the natural gas supply fails, the system includes a propane storage tank to provide fuel to the 3c microturbine generators. The system also has an array of rectifiers to convert the AC power from the microturbine generator to DC power. If both of the microturbine generators' fuel sources fail or become exhausted, power is supplied to the rectifiers by a commercial electrical utility, and the system includes components to receive the utility-supplied electricity. The system also includes a number of hydrogen-powered proton exchange membranes that are operable to supply DC power directly to the facility if both the microturbine generators and the electrical utility fail. Finally, the system includes a number of super capacitors that are operable to maintain power during the time required to change between power sources.
3d BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
[0009] The present invention is described in detail below with reference to the attached figure, wherein:
[OM] FIG. 1 is a schematic diagram of the present invention without the sensing/control mechanism.
[001 1] FIG. 2 is a functional block diagram of the major components of the present invention; and [0012]
FIG. 3 is a block diagram showing the physical relationship of the present invention.

[0013] The present invention includes both a system and a method for providing reliable electrical power to a facility, and specifically to a telecommunications facility. The system provides redundant sources of electrical power including a number of microturbine generators and a number of proton exchange membranes (PEMs). The system also includes a number of capacitors to provides power during the time it takes to switch between power sources. By employing these components, the system avoids the need for an array of batteries and is more cost efficient than the current method for providing power to telecommunications facilities.
[0014] The present invention is best understood in connection with the schematic diagram of FIG. 1-3. In FIG. 1, the power system of the present invention initially comprises a number of microturbine generators 10. A turbine includes a rotary engine actuated by the reaction or impulse or both of a current of fluid, such as air or steam, subject to pressure and an electrical generator that utilizes the rotation of the engine to produce electrical power. Microturbine generators are a recently 1162978.1 Page 4 of 19 developed technology and have not been employed to provide power to a telecommunications facility. A microturbine is smaller and more compact than more common turbines and creates a lower amount of harmful emissions than both more common turbines and diesel generators. A
microturbine generator includes a system for receiving fuel, a microturbine for converting the fuel received to electrical power and a digital power controller. Thus, a microturbine generator is able to utilize a fuel source such as natural gas or propane to produce electrical power. One microturbine generator that is suitable for the present invention is the Capstone 60 MicroTurbine' system produced by the Capstone Turbine Corporation of Chatsworth, California. As is understood by those in the art, the number of microturbine generators used in the inventive system depends on the amount of power required by the destination facility.
[0015] The present invention is designed to provide fuel from two different sources to microturbine generators 10. Initially, microturbine generators 10 are fueled by natural gas. The natural gas is received in primary fuel valve 20 which is coupled to primary fuel pipe or line 30.
Pipe 30 is also coupled to a series of valves 40, and each of valves 40 is also coupled to an input of a corresponding mixing box 50. The output of mixing boxes 50 is coupled to the input of one of microturbine generators 10. Microturbine generators 10 may also be powered by propane stored in a local storage tank 60. The propane is received through backup fuel valve 70 which is coupled to backup fuel pipe or line 80. Pipe 80 is also coupled to a series of valves 90, and each of valves 90 is coupled to an input of mixing boxes 50. Mixing boxes 50 is operable to combine fuel received with any necessary additional components and thereafter provide appropriate amounts of fuel to microturbine generators 10. Mixing boxes 50 are capable of receiving and responding to a control 1162978.1 Page 5 of 19 ____________________________ õ ____________ signal by at least opening or closing lines. In addition, valves 20, 40, 70 and 90 are also capable of receiving and responding to a control signal by at least opening and closing.
[0016] Microturbine generators 10 utilize the natural gas or propane fuel to produce AC
electrical power. The output electrical current from each microturbine generator 10 is coupled to one end of a circuit breaker 100 in order to protect the circuit such as, for example, if microturbine generator 10 causes a power surge. The opposite end of circuit breakers 100 is coupled to a bus line 110 that is also coupled to switch 120. Bus line 130 is coupled to the output of switch 120 and to a number of rectifiers 140. As is known, a rectifier is capable of receiving an AC input and rectifying or converting that input to produce a DC output. Thus, rectifiers 140 convert the microturbine-produced AC power to DC power. The output of rectifiers 140 is coupled to bus line 150 which is connected to the power distribution unit 160 in the destination facility. Power distribution unit 160 contains connections into the telecommunications facility's power lines, and/or provides connections to the various telecommunications equipment. Power distribution unit 160 may also contain additional circuit breakers or other power switch gear or safety devices and/or circuits, including circuits to limit the voltage or current provided to the facility's power lines, and monitoring/measuring equipment. A number of super capacitors 170 are also connected to bus line 150.
[00171 The system of the present invention is also capable of receiving power from a commercial utility. Utility-supplied power is received on bus line 180, and a connection to ground is provided through line 190. Bus line 180 is connected to one side of switch 200, and the other side of switch 200 is coupled to the primary side of transformer 210. As is known, a transformer is capable of receiving an input signal on its primary side and producing a corresponding signal on its 1162978.1 Page 6 of 19 =
secondary side that is electronically isolated from the input signal. The secondary side of transformer 210 is coupled to one side of a main circuit breaker 220. The opposite side of main circuit breaker 220 is coupled to one side of a number of circuit breakers 230. The opposite side of one of the circuit breakers 230 is connected to bus line 240; the remaining circuit breakers 230 are available to provide electrical power for additional applications or systems.
Bus line 240 is also connected to an input of switch 120.
[0018] The power system of the present invention also includes a number of proton exchange membrane fuel cell modules (PEMs) 250. A PEM is a device that is capable of converting dry gaseous hydrogen fuel and oxygen in a non-combustive electrochemical reaction to generate DC
electrical power. Because the only by-products of this reaction are heat and water, a PEM is friendly to the environment and may be used indoors and in other locations where it is not possible to use a conventional internal combustion engine. In addition, unlike a battery, a PEM is capable of providing electrical power for as long as fuel is supplied to the unit. One PEM that is suitable for the present invention is the NexaTm power module manufactured by Ballard Power Systems Inc. of Burnaby, British Columbia, Canada. As with microturbine generators 10, the number of PEMs 250 required is dependent on the amount of power required by the destination facility.
[0019] Hydrogen fuel is supplied to the PEMs 250 from a number of storage tanks 260 located in a vault 270. Each of the storage tanks 260 is coupled to a valve 280. Each of valves 280 is coupled to a valve 290 which is also coupled to a pipe 300. Thereafter, pipe 300 is coupled to a series of valves 310, and each of valves 310 is coupled to one of the PEMs 250. The output of the PEMs 250 is connected between bus line 150 and a circuit breaker 320. As stated above, super capacitors 170 and the power distribution unit 160 of the facility are also connected to bus line 150.
1162978.1 Page 7 of 19 The other side of circuit breakers 320 is connected to a bus line 330. There are two switches connected to bus line 330. Switch 340 is coupled to bus line 330 on one side and bus line 150 on the other side. Switch 350 is coupled to bus line 330 on one side and bus line 360 on the other side.
Unlike bus line 150, bus line 360 is only connected to power distribution unit 160 of the facility.
[0020] The power system of the present invention also comprises a number of sensing and control mechanisms (not expressly shown) for determining which fuel source to activate and which power source to engage. As is known, the sensing mechanisms may be separate devices or may be integral to the valves, bus lines, and/or devices being monitored. Likewise, the control mechanism may be a separate device, such as a programmable logic controller, or may be part of one of the components already described, such as the microturbine generators 10. It is also possible that the sensing and control mechanisms may be combined into a solitary mechanism that may be a stand-alone unit or may be combined with one of the components already described.
[0021] The operation of the power system may be understood by referring to FIG. 2. It should be noted that the present invention is represented in FIG. 2 by functional blocks. Thus, sensing/control mechanism 370 is shown as one unit when in fact the sensing and control devices actually may be several devices as discussed previously. Of course, all of the sensing and control devices actually may be placed together in a separate unit, such as a programmable logic controller, as shown in FIG. 2.
[0022] In operation, the sensing/control mechanism 370 initially causes valves 380 (which include valves 40 and 90 shown in FIG. 1) to allow natural gas to flow from the utility source to the microturbine generators 390 and to prevent the flow of propane to microturbine generators 390.
Sensing/control mechanism 370 also initiates operation of the microturbine generators 390. In 1162978.1 Page 8 of 19 addition, sensing/control mechanism 370 also causes valves 400 (which include valves 310 shown in FIG. 1) to prevent the flow of hydrogen to the PEMs 410 and causes the PEMs 410 to remain off.
In this manner, microturbine generators 390 produce AC power using utility-supplied natural gas.
The AC current produced by the microturbine generators passes through switch 420 to rectifiers 430 where it is converted to DC current. Thereafter, the DC current from rectifiers 430 is provided to the telecommunications facility and to super capacitors 440. As is well known, when they first receive DC current, super capacitors 440 charge to the level of the DC power provided.
[0023] If sensing/control mechanism 370 determines that there is an interruption in the utility-supplied natural gas, then it will cause valves 380 to prevent the flow of natural gas and allow the flow of hydrogen to microturbine generators 390. Switch 420 remains in the same position as before and valves 400 continue to prevent the flow of hydrogen to PEMs 410. In this configuration, microturbine generators 390 continue to generate AC power but now their fuel is propane.
[0024] If the sensing/control mechanism 370 determines that both fuel sources for microturbine generators 390 have failed or that there is some other disturbance in the microturbine-supplied power which causes that power to become inadequate, then sensing/control mechanism 370 will cause valves 380 to close and deactivate the microturbine generators 390.
Sensing/control mechanism 370 will set switch 420 so that rectifiers 430 receive AC power from the electric utility.
In addition, sensing/control mechanism 370 will keep valves 400 closed and PEMs 410 deactivated.
[0025] If sensing/control mechanism 370 determines that the electric utility has failed or the power it supplies has become inadequate and the microturbine generators 390 remain deactivated, such as due to a lack of fuel or a malfunction, then sensing/control mechanism 370 will cause valves 400 to open which allows hydrogen to flow to PEMs 410. Thereafter, the control mechanism will 1162978.1 Page 9 of 19 activate PEMs 410. In this manner the PEMs 410 provides DC power to the telecommunications facility and to super capacitors 440.
[0026] In each of the above scenarios, super capacitors 440 provide electrical power during the time it takes for the control mechanism to switch from one power source to another. Thus, super capacitor 440 must have a discharge time greater than the longest time required to switch between power sources. One super capacitor that is suitable for this invention is manufactured by Maxwell Technologies located in San Diego, California.
[0027] Referring now to FIG. 3, significant portions of the present invention may be enclosed in a modular, weatherproof container, indicated by the numeral 450, that is transportable by truck or rail. For example, all of the components shown in FIG. 1, except tank 60 and vault 270 with the components contained therein, may be pre-assembled and pre-wired with the sensing/control mechanism(s) and then placed in container 450 before being shipped to a facility. Once at the facility, propane storage tank 460 and hydrogen storage vault 470 are provided and coupled to container 450. Once utility-supplied natural gas and electricity lines have been coupled to container 450 and the output of container 450 is coupled to the telecommunications facility 480, then the unit may be activated.
[0028] As discussed, the power system described above initially employs microturbine generators to provide electrical power for a telecommunications facility. The microturbine generators are compact, efficient (both in terms of space and fuel) and reliable. By relying on microturbine generators as the main source of power, the system avoids both the reliability problems and environmental hazards inherent in internal combustion generators and the costs and environmental concerns associated with commercial electrical power. The power system also 1162978.1 Page 10 of 19 , ___________________________________________ provides redundant sources of power, specifically from a commercial electrical utility and a number of proton exchange membranes, and therefore is uninterruptible. Finally, the system provides a number of super capacitors to provide electrical power during the time it takes to switch between power sources. By employing super capacitors and proton exchange membranes, the power system avoids the use of batteries thereby saving significant cost and space.
[0029] It will be appreciated by persons skilled in the art that the present invention is not limited to what has been particularly shown and described hereinabove. Rather, all matter shown in the accompanying drawings or described hereinabove is to be interpreted as illustrative and not limiting. Accordingly, the scope of the present invention is defined by the appended claims rather than the foregoing description.
1162978.1 Page 11 of 19 = . _

Claims (19)

CLAIMS:
1. A power supply system for providing reliable electrical power to a telecommunications facility, said facility containing telecommunications equipment, said system comprising:
a primary fuel line that supplies a primary fuel from a commercial utility;
a backup fuel line that supplies a backup fuel from a backup fuel source;
a microturbine generator operable to produce AC electrical power that is coupled to said primary fuel line and said backup fuel line, wherein said microturbine generator is selectably powered by either said primary fuel from said commercial utility or said backup fuel;
a control mechanism that selects said primary fuel to power said microturbine generator when a flow of said primary fuel is above a predetermined value, and selects said backup fuel to power said microturbine generator when the flow of said primary fuel falls below the predetermined value;
a rectifier operable to convert said AC electrical power received from said microturbine generator to a first DC electrical power adaptable to power said telecommunication equipment;
a switching mechanism that receives AC electrical power from said microturbine generator and AC electrical power from a commercial power utility, wherein said switching mechanism is coupled with said rectifier, wherein said switching mechanism operates to provide AC electrical power from said microturbine generator to said rectifier so long as said AC electrical power from said microturbine generator remains above a predetermined value and to provide AC electrical power from said commercial power utility to said rectifier when said AC electrical power from said microturbine generator falls below said predetermined value;

at least one proton exchange membrane that is operable to produce a second DC electrical power adaptable to power said telecommunication equipment when said first DC electrical power is unavailable, said at least one proton exchange membrane adapted to be powered by a fuel;
a proton exchange membrane fuel line containing a fuel valve;
a proton exchange membrane fuel control operable to open said fuel valve in said proton exchange membrane fuel line when the AC electrical power provided to said rectifier falls below a predetermined value;
at least one capacitor coupled to an output of said at least one rectifier.
2. A system as set forth in claim 1 wherein said primary fuel for said at least one microturbine generator is natural gas.
3. A system as set forth in claim 1 or 2, wherein said backup fuel for said at least one microturbine generator is propane.
4. A system as set forth in claim 3 wherein said propane is stored on site.
5. A system as set forth in any one of claims 1 to 4, wherein said primary fuel line is coupled to a primary fuel valve and said backup fuel line is coupled to a backup fuel valve.
6. A system as set forth in claim 5 further comprising a microturbine generator fuel control operable to open and close said primary fuel valve and said backup fuel valve.
7. A system as set forth in any one of claims 1 to 6, wherein said fuel for said at least one proton exchange membrane is hydrogen.
8. A system as set forth in claim 7 wherein said hydrogen is stored on site.
9. A power supply system for providing reliable electrical power to a telecommunications facility, said facility containing telecommunications equipment, said system comprising:

a first AC power source that operates from one of a plurality of fuels that include a fuel from a commercial utility and a locally-stored backup fuel, wherein the one fuel is selected based on an availability of the plurality of fuels and a predetermined selection order of available fuels, such that the fuel from the commercial utility is selected as the one fuel while the fuel from the commercial utility is available and the locally-stored backup fuel is selected as the one fuel when the primary fuel becomes unavailable;
a rectifier that operates to convert AC electrical power from one of a plurality of AC power sources to a first DC electrical power, wherein said first DC
electrical power is adapted to power said telecommunications equipment, and wherein said plurality of AC
power sources includes said first AC power source and a second AC power source, wherein said one AC power source is selected based on an availability of said plurality of AC power sources and a predetermined selection order of available AC power sources, wherein said first AC power source and said second AC power source are connected to a switching mechanism, wherein when said first AC power source is selected, said switching mechanism supplies power from said first AC power source to said rectifier, and wherein when said second AC
power source is selected, said switching mechanism provides power from said second AC
power source to said rectifier;
at least one proton exchange membrane that is operable to produce a second DC electrical power adaptable to power said telecommunications equipment when said first DC electrical power is unavailable, said at least one proton exchange membrane adapted to be powered by a fuel; and at least one capacitor coupled to the output of said at least one proton exchange membrane.
10. A system as set forth in claim 9 wherein said fuel for said at least one proton exchange membrane is hydrogen.
11 . A system as set forth in claim 10 wherein said fuel is stored on site.
12. A power supply system for providing reliable electrical power to a telecommunications facility, said facility containing telecommunications equipment, said system comprising:
a first fuel line containing a first fuel valve and a second fuel line containing a second fuel valve, wherein both said first fuel line and said second fuel line are coupled to a microturbine generator;
said microturbine generator operable to produce AC electrical power that is selectably powered by either a first fuel from said first fuel line or a second fuel from said second fuel line, wherein said microturbine generator is normally selected to be powered by said first fuel;
means for receiving AC electrical power from an electric utility;
a rectifier operable to convert said AC electrical power to DC electrical power adaptable to power said telecommunication equipment, wherein said rectifier receives said AC electrical power from either said microturbine generator or said electric utility, wherein said rectifier normally receives said AC electrical power from said microturbine generator;
at least one capacitor coupled to the output of said at least one rectifier;
at least one proton exchange membrane that is operable to produce DC
electrical power adaptable to power said telecommunication equipment, said at least one proton exchange membrane adapted to be powered by a third fuel, wherein said at least one proton exchange membrane operates when DC electrical power is unavailable from said rectifier;
a first control means for selecting said microturbine generator to be powered by said a second fuel when a flow of said first fuel is insufficient;
a second control means for switching said rectifier from said AC electrical power produced by said microturbine generator to said AC electrical power from said electric utility when said AC electrical power produced by said microturbine generator is insufficient;
and a third control means for switching from said DC electrical power produced by said rectifier to DC electrical power produced by said at least one proton exchange membrane when said DC electrical power produced by said rectifier is insufficient.
13. A system as set forth in claim 12 further comprising means to monitor said AC
electrical power produced by said at least one microturbine generator.
14. A system as set forth in claim 12 or 13 further comprising means to monitor said AC electrical power received from said electric utility.
15. A system as set forth in any one of claims 12 to 14 further comprising means for monitoring the flow of fuel in said primary fuel line.
16. A system as set forth in any one of claims 12 to 15 further comprising means for controlling said primary fuel valve and said backup fuel valve.
17. A method for supplying power to a telecommunications facility from a power supply system, said method comprising the following steps:
providing a primary fuel from commercial utility to a microturbine generator, said microturbine generator operable to produce a first AC electrical power, wherein said microturbine generator is capable of receiving fuel from both the commercial utility and a locally-stored backup fuel source;
providing a backup fuel from said locally-stored backup fuel source to said microturbine generator if the flow of said fuel falls below a predetermined value;
providing said first AC electrical power produced by said microturbine generator to a rectifier, said rectifier operable to convert said first AC
electrical power to DC
electrical power;

when said first AC electrical power falls below a predetermined value, providing a second AC electrical power from an electric utility to said rectifier;
providing said DC electrical power from said rectifier to at least one capacitor;
and providing said DC electrical power from said rectifier to said telecommunications facility.
18. A method as set forth in claim 17 further comprising the steps of:
providing DC power produced by at least one proton exchange membrane if said first AC electrical power and said second AC electrical power received at said at least one rectifier falls below a predetermined value.
19. A method for supplying power to a telecommunications facility from a power supply system, said method comprising the following steps:
supplying one of a plurality of fuels to a first AC power source, wherein said first AC power source operates from said one fuel, and wherein said one fuel is selected based on an availability of said plurality of fuels and a predetermined selection order of available fuels;
supplying one of a plurality of AC power sources to a rectifier by way of a switch that selects between the AC power sources, wherein said rectifier operates to convert AC electrical power to a first DC electrical power, wherein said plurality of AC power sources includes said first AC power source, and wherein said one AC power source is selected based on an availability of said plurality of AC power sources and a predetermined selection order of available AC power sources;
providing said first DC electrical power to said telecommunications facility when said first DC electrical power is available;

providing fuel to at least one proton exchange membrane when said first DC
electrical power is unavailable, said at least one proton exchange membrane operable to produce a second DC electrical power;
providing said second DC electrical power produced by said at least one proton exchange membrane to at least one capacitor; and providing said second DC electrical power produced by said at least one proton exchange membrane to said telecommunications facility when said first DC
electrical power is unavailable.
CA 2424694 2002-11-15 2003-04-07 Power system for a telecommunication facility Expired - Lifetime CA2424694C (en)

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US7157803B2 (en) 2007-01-02
US20040095022A1 (en) 2004-05-20
US7626284B2 (en) 2009-12-01
US8269371B2 (en) 2012-09-18
US20040094963A1 (en) 2004-05-20
WO2004047250A3 (en) 2004-08-12
US20060049637A1 (en) 2006-03-09
AU2003295516A8 (en) 2004-06-15
US7875995B2 (en) 2011-01-25
US20080203822A1 (en) 2008-08-28
CA2424694A1 (en) 2004-05-15
US6879052B1 (en) 2005-04-12
US20110074216A1 (en) 2011-03-31
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US20080203821A1 (en) 2008-08-28
US6960838B2 (en) 2005-11-01
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US8106533B1 (en) 2012-01-31

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