CN102468755A - Controller device and control method of new energy power-supply system - Google Patents
Controller device and control method of new energy power-supply system Download PDFInfo
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- CN102468755A CN102468755A CN201010547202XA CN201010547202A CN102468755A CN 102468755 A CN102468755 A CN 102468755A CN 201010547202X A CN201010547202X A CN 201010547202XA CN 201010547202 A CN201010547202 A CN 201010547202A CN 102468755 A CN102468755 A CN 102468755A
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Abstract
The invention discloses a controller device and a control method of a new energy power-supply system; the controller device comprises a boost module (1), a voltage reduction module (2), a diode (3), an automatic switch (4), a boost driving module (5), a voltage reduction driving module (6) and a sampling control module (7), wherein the sampling control module (7) is used for sampling voltage signals and current signals respectively from an input point (A) and an output point (B) of the boost module (1) as well as an output point (C) of the voltage reduction module, and after processing and operation, the sampled voltage signals and current signals are sent into the boost driving module (5) and the voltage reduction driving module (6), so that the automatic switch (4) can be controlled to be switched on or off; when the input voltage Va of the input point (A) of the boost module (1) is lower than the set value Vr, the input voltage is boosted; and when the input voltage Va is higher than the set value Vr, the controller device is shut down and stops working. The invention is capable of improving the utilization rate of a direct current (DC) source and the conversion efficiency, and is compatible with an input withdrawal type DC source.
Description
Technical field
The present invention relates to new energy systems technology field, in particular to a kind of new energy system controller device and control method.
Background technology
Receive the pressure of energy-saving and emission-reduction, communication equipment uses the applied more and more of new energy resources system such as solar energy, wind energy as electric power system.The power supply that the new energy system provides to communication equipment is that direct current input or rectifiable become the direct current input, below DC power supply that new forms of energy are produced be called for short " DC source ".When DC source in the time can accepting voltage range; Is 48V or 24V or 12V battery charging through controller to nominal voltage; Give the communication equipment electric simultaneously; When the voltage range of DC source has exceeded controller tolerance interval or DC source and is not enough to holding load power and needs, batteries discharge powering load.As shown in Figure 1, the scope of batteries charging/discharging voltage Vo is V1～V3, and wherein V1 is discharge off protection voltage and charging initial voltage, and V3 is battery pack even charging voltage and beginning discharge initiation voltage.DC source receives the attribute of DC source own and moves the compatible influence of considering of power supply on the net with the past; The scope of its input voltage Vs is from V2～V4; The voltage of this scope is accumulators group and electric directly, need could be accepted by batteries and load through controller control or conversion.
The output characteristic of DC source is when a certain electrical voltage point, can Maximum Power Output.Controller in the past adopts throws the formula of removing or general MPPT (Maxium Power Point Track; MPPT maximum power point tracking) mode boost or step-down is transformed into batteries with DC source and needs voltage, exist insufficient or conversion efficiency low or do not match with accumulator battery voltage or dispose and defective such as owe flexibly to the utilization of power of new forms of energy.
The existing controller technology comprises following several kinds of schemes:
Scheme one: throw the formula of removing; Throwing is removed formula and (is also called off the pass mode controller; Switch Mode Controller); The switch of controller is relay or power electronic switching device, is that access (input) or disconnection (removing) come the output voltage of controller is carried out rough voltage stabilizing through controlling one or more DC source.The DC source output voltage is by battery tension clamp (ignoring switch and line drop), so the output voltage of DC source can't be operated in the voltage of maximum power point (mpp), also just can't make full use of the power output of new forms of energy.
Scheme two: adopt single-stage boosting mode or single-stage buck mode; Because the output voltage range of DC source is very wide; And the batteries required voltage that controller output connects changes also very greatly when different conditions, therefore causes controller can't be operated in the voltage range (promptly can't make full use of the output of new forms of energy) that its best efficiency point perhaps can't satisfy the broad of DC source.
Scheme three: boost and simple string of step-down mode or parallel connection combination, or because of existing multi-stage transformation to cause conversion efficiency low or because of satisfying the charging voltage demand of batteries simultaneously.
Summary of the invention
Technical problem to be solved by this invention is, the control device and the control method thereof of a kind of new energy system is provided, be used for overcoming utilization rate of electrical that the DC source of prior art new forms of energy exists low with the low defective of controller conversion efficiency.
In order to address the above problem, the present invention proposes the control device of a kind of new energy system, comprising: boost module (1), step-down module (2); Diode (3), automatic switch (4), the driver module that boosts (5); Step-down driver module (6), controlling of sampling module (7), wherein:
The output of the external DC source of input point (A) of said boost module (1) is connected with the anode of diode (3), first link of automatic switch (4) simultaneously;
The output point (B) of said boost module (1) is connected with the input of step-down module (2), is connected with the negative electrode of diode (3), second link of automatic switch (4) simultaneously;
The output point (C) of said step-down module (2) is connected to batteries and communication equipment load;
Said controlling of sampling module (7) is respectively from input point (A), the output point (B) of boost module (1); The output point (C) of step-down module (2) is gathered the voltage and current signal, through sending the closed of the driver module that boosts (5), step-down driver module (6) and control automatic switch (4) after the processing operations or breaking off;
The said driver module that boosts (5) is used for driving boost module (1), and said step-down driver module (6) is used for driving step-down module (2).
Said boost module (1) is used for when the input voltage Va of input point (A) is lower than set point Vr, input voltage being boosted; Be used for when input voltage Va is higher than set point Vr, closes and not working.
Said automatic switch (4) is used for conducting when the input voltage Va of input point (A) is higher than set point Vr, with boost module (1) short circuit.
Said diode (3) is used at boost module (1) when closing and automatic switch (4) does not have conducting moment to give step-down module (2) power supply.
Said step-down module (2) is used for when the input voltage Va of input point (A) is higher than set point Vr, and the input voltage that transmits through automatic switch (4) or diode (3) is carried out step-down; Be used for perhaps that the output voltage to boost module carries out step-down when the input voltage Va of input point (A) is lower than set point Vr.
Said controlling of sampling module (7); Be used for input point (A) sampling input voltage and input current signal from boost module (1); The output point (B) of boost module (1) adopts the output current and the output voltage signal of output point (C) the sampling step-down module (2) of voltage signal, step-down module (2); Drive boost module (1) according to the driver module (5) that boosts of control after the electric current that obtains of sample and/or the voltage signal computing, control step-down driver module (6) drives step-down module (2); See the disconnected and logical of signal controlling automatic switch (4) off.
The present invention also provides the control method of the control device of a kind of new energy system, comprising:
The input voltage Va that controlling of sampling module (7) detects boost module (1) is when setting threshold voltage Vr; Automatic switch (4) closure; Boost module (1) is not worked, and controlling of sampling module (7) follows the tracks of being operated in DC source peak power output point through step-down driver module (6) control step-down module (2) beginning MPPT maximum power point tracking (MPPT) scanning; When the output voltage of controller is lower than the even charging voltage value Ve of setting, step-down module (2) is proceeded the MPPT operating state.
Said method further comprises: when the output voltage V c of step-down module (2) reached the even charging voltage value Ve of setting, step-down module (2) transferred the voltage stabilizing state to by MPPT maximum power point tracking (MPPT).
Said method further comprises: when the output voltage V c of step-down module (2) reaches even charging voltage value Ve, pick up counting, behind the certain hour t1, transfer the floating charge mode to by equal modes of filling, this moment, output voltage V c was reduced to float charge voltage value Vf.
Said method further comprises: the input voltage Va of the boost module (1) that samples when controlling of sampling module (7) is lower than when setting threshold voltage Vr and being higher than the lower voltage limit V2 of tolerance interval; When the difference of the output voltage V c of input voltage Va and boost module (2) is lower than the setting voltage difference simultaneously; Boost module (1) and step-down module (2) are all worked; Automatic switch (4) breaks off; Diode (3) blocking-up, boost module (1) are operated in alternately control between MPPT maximum power point tracking (MPPT) ring and the Voltage loop, step-down module (2) current limliting voltage stabilizing work.
The condition that is operated in MPPT maximum power point tracking (MPPT) state of said boost module (1) is: the duty ratio D of step-down module (2) is greater than setting dutyfactor value D1.
The condition that withdraws from MPPT maximum power point tracking (MPPT) state of said boost module (1) is: the duty ratio of step-down module (2) is less than setting dutyfactor value D2.
The present invention also provides the control method of the control device of another kind of new energy system, comprising:
The input voltage Va of the boost module (1) that samples when controlling of sampling module (7) is lower than when setting threshold voltage Vr and being higher than the lower voltage limit V2 of tolerance interval; When the difference of the output voltage V c of input voltage Va and step-down module (2) is lower than the setting voltage difference simultaneously; Boost module (1) and step-down module (2) are all worked; Automatic switch (4) breaks off; Diode (3) blocking-up, boost module (1) are operated in alternately control between MPPT maximum power point tracking (MPPT) ring and the Voltage loop, step-down module (2) current limliting voltage stabilizing work.
The condition that is operated in MPPT maximum power point tracking (MPPT) state of said boost module (1) is: the duty ratio D of step-down module (2) is greater than setting dutyfactor value D1.
The condition that withdraws from MPPT maximum power point tracking (MPPT) state of said boost module (1) is: the duty ratio of step-down module (2) is less than setting dutyfactor value D2.
The control device and the control method of new energy system proposed by the invention; According to same DC source during in the different voltages with different section of broad and in the storage battery different state; Controller is operated in different state, can overcome the low and low defective of controller conversion efficiency of utilization rate of electrical of the DC source existence of new forms of energy in prior art and the method.Adopt control device of the present invention and method; Can improve the utilance of DC source, can improve the conversion efficiency of controller itself, can remove the DC source compatibility of formula mode with throwing previously; Be applicable to existing communication equipment, make the input DC source configuration of controller more flexible.
Description of drawings
Fig. 1 is the direct voltage scope and the batteries required voltage scope sketch map of new forms of energy output;
Fig. 2 is the control device sketch map of a kind of new energy of the present invention system;
Fig. 3 is the control method sketch map of the controller of a kind of new energy of the present invention system;
Fig. 4 is a kind of controller for solar device sketch map of embodiment one according to the invention;
Fig. 5 is a kind of wind energy control device sketch map of embodiment two according to the invention.
Embodiment
For making the object of the invention, technical scheme and advantage clearer, the present invention is done to specify further below in conjunction with accompanying drawing.
The present invention proposes a kind of control device and control method of new energy system of suitable communication usefulness; Hang down and the defective that can't make full use of the new forms of energy electric energy to existing controller and the existing conversion efficiency of control method; The improvement of doing mainly is; During in the different voltages with different section of broad and in the storage battery different state, make controller be operated in different state according to same DC source.This with previously throw that to remove communicating by letter of formula controller better compatible with new energy resources system, satisfy the demand of communication power supply preferably.The utilance of DC source can be improved, the conversion efficiency of controller itself can be improved.
New energy system controller device of the present invention shown in accompanying drawing 2, comprising: boost module 1, and step-down module 2, diode 3, automatic switch 4, the driver module 5 that boosts, step-down driver module 6, controlling of sampling module 7, wherein:
The output of the external DC source 10 of the input point A of said boost module 1 is connected with the anode of diode 3, first link of automatic switch 4 simultaneously;
The output point B of said boost module 1 is connected with the input of step-down module 2, is connected with the negative electrode of diode 3, second link of automatic switch 4 simultaneously;
The output point C of said step-down module 2 is connected to batteries 8 and communication equipment 9 loads;
Said controlling of sampling module 7 is respectively from input point A, the output point B of boost module 1; The output point C of step-down module 2 gathers the voltage and current signal, through sending the closed of the driver module 5 that boosts, step-down driver module 6 and control automatic switch 4 after the processing operations or breaking off;
The said driver module 5 that boosts is used for driving boost module 1, and said step-down driver module 6 is used for driving step-down module 2.
During shown in Figure 2 said new energy system controller device busy:
(the Vr value can be established according to different environment and batteries demand) can boost to input voltage when said boost module 1 was lower than set point Vr at the voltage Va of input point A.When input voltage Va was higher than set point, boost module 1 was closed and is not worked.Boost module 1 is controlled through the driver module 5 that boosts by controlling of sampling module 7.
The input voltage of coming through automatic switch 4 or diode 3 in 2 pairs of controllers of said step-down module or the output voltage of boost module 1 carry out step-down, satisfy battery charging voltage and powering load requirement.Step-down module 2 is controlled through step-down driver module 6 by controlling of sampling module 7.
Said automatic switch 4 is when input voltage is higher than set point, and conducting to reduce conduction loss, does not improve the conversion efficiency of controller with boost module 1 short circuit when not working because of boost module 1.Automatic switch 4 receives 7 controls of controlling of sampling module.Automatic switch 4 can be that relay or contactor or other conduction loss are low and be easy to control device.
Said diode 3 is avoided step-down module 2 moments input power down when boost module 1 is closed and automatic switch 4 does not have conducting moment to give the step-down module 2 power supplies.
Said controlling of sampling module 7 is from A point sampling input voltage shown in Figure 2 and input current signal; The B point adopts voltage signal, C point sampling output current and output voltage signal; Through sending boost driver module 5 and step-down driver module 6 after 7 computings of controlling of sampling module, drive boost module 1 and step-down module 2 respectively.Controlling of sampling module 7 is seen the disconnected and logical of signal controlling automatic switch 4 off simultaneously.
As shown in Figure 3, the control method of Fig. 2 middle controller comprises the control to following several kinds of operating states:
Operating state 1:
When controller starts; Controlling of sampling module 7 detects input voltage; When detecting Va more than or equal to Vr (this value can be established according to environmental condition etc.), automatic switch 4 closures, boost module 1 is not worked; Controlling of sampling module 7 follows the tracks of being operated in DC source peak power output point through the 2 beginning MPPT scannings of step-down driver module 6 control step-down modules;
Be lower than the even charging voltage value Ve (this value is suitably set according to different batteries group and local climate condition among a small circle) of setting when the output voltage of controller; Expression communication equipment 9 loads and storage battery 8 need the power output of controller to want enough big, and then step-down module 2 is proceeded the MPPT operating state.
The basic principle of MPPT is in some cycles, and the input voltage of 7 pairs of controllers of controlling of sampling module (being the output voltage of DC source) scans within the specific limits, and the input power (being the power output of DC source) of controller is differentiated.Be Δ P, Δ P is the step value of algorithm, increases a Δ P at every turn, judges the derivative Δ P of power output, if Δ P shows also not reach maximum power point that if less than zero, the expression output voltage has surpassed maximum power point greater than zero.Searching out null tangent position like this, is exactly maximum power point.
When controller startup work, controlling of sampling module 7 sampling input voltages, input current, and the variation delta P of rated output if Δ P=0 this means that controller is operated in DC source peak power output point, just need not adjustment.If Δ P ≠ 0; The expression controller also is not operated in the peak power output point of DC source; Need to change its operating voltage point, quiescent potential is heightened or is reduced and depends on current variation tendency, if U* (dI)+I* (dU)＜0; Represent that current quiescent potential is higher than maximum power point voltage, need the working point be moved toward reducing voltage direction.Otherwise if U* (dI)+I* (dU)＞0, expression work at present point voltage is lower than maximum power point voltage, need heighten quiescent potential.
When the DC source output voltage changed with environmental condition or load size reason, controller was in time adjusted the operating voltage point through above-mentioned workflow, so that controller reaches maximum power output, utilizes the output energy of DC source maximumly.
Operating state 2
When the output voltage V c of controller reaches the even charging voltage value Ve of setting; Expression load and storage battery no longer need the power of full-amount MPPT control mode output; Step-down module 2 transfers the voltage stabilizing state to by the MPPT state, this moment output voltage stabilization, output current progressively reduces.
Operating state 3
When the output voltage V c of controller reaches even charging voltage value Ve, pick up counting, behind the certain hour t1 (can establish), reduce output voltage, promptly transfer the floating charge mode to by equal modes of filling to float charge voltage value Vf.
When three kinds of operating states of above-mentioned 1,2,3; Boost module 1 is closed; Just step-down module 2 work; When the difference that the input voltage Va that is based on controller is higher than input voltage and the output voltage of magnitude of voltage Vr of setting (this value can be established according to environmental condition etc.) or controller is higher than some set points (Va-Vc=Δ U, this voltage difference is according to step-down module self character and duty optimization setting recently).
Operating state 4
The input voltage Va of the controller that samples when controlling of sampling module 7 in the controller be lower than Vr but when being higher than the lower voltage limit V2 of tolerance interval; When simultaneously the difference of the input voltage of controller and output voltage is lower than some set points (this voltage difference reaches duty optimization setting recently according to step-down module itself); This moment, the boost module 1 of controller all needed work with step-down module 2; The boost module 1 of prime is started working, and automatic switch 4 breaks off, diode 3 blocking-up; Prime boost module 1 is operated in alternately control between MPPT ring and the Voltage loop, step-down module 2 current limliting voltage stabilizings work.
Operating state 5
The condition of the MPPT state of prime boost module 1 is: as the duty ratio D of back level step-down module 2 during greater than a certain set point D1; Duty ratio strengthens proof back level output current in the regulation loop action and is strengthening, and needs prime to carry out the power output that the MPPT state improves DC source.
Operating state 6
The condition that prime boost module 1 withdraws from the MPPT state is: when the duty ratio of the step-down module 2 of back level during less than a certain set point D2; Output current was reducing when duty ratio was dwindled the level regulation loop work of proof back; Power output is reducing; Need prime to withdraw from the MPPT state, reduce the power output of DC source 10.
When the MPPT of prime boost module 1 ring withdrawed from, DC source 10 power outputs reduced, and the duty ratio of the step-down module 2 of level can increase Δ D after this moment; For assurance does not get into the MPPT state because of the increase of Δ D again; Need Δ D＜D1-D2, promptly the duty ratio of the step-down module 2 of expression back level gets into MPPT to prime and to withdraw from MPPT different slightly, have one time stagnant; The setting that return to stagnate should retentive control device steady operation, can improve the utilance of DC source again.
If when the input voltage Va of controller is higher than Vr at this moment, then close boost module 1, diode 3 conductings, automatic switch 4 closures have only step-down module 2 work of back level this moment, get back to operating state 1.
When if the input voltage Va of controller is lower than V2, then controller dormancy, communication equipment 9 loads institute energy requirement is all provided by 8 groups of discharges of storage battery.
Embodiment one: a kind of control device of solar photovoltaic powered system and control method
As shown in Figure 4, provided the control device sketch map that the present invention is based on solar photovoltaic powered system.Among this embodiment, DC source shown in Figure 2 10 is replaced with solar energy photovoltaic array 200, with solar energy photovoltaic array 200 as DC source through controller to communication equipment load supply power, and storage battery is charged.
For compatible with the assembly output voltage of the solar electric power supply system of throwing the formula of removing in the past; Also for compatible with the 48V batteries; In the present embodiment one; Adopt one group of perhaps solar battery of organizing parallelly connected 2 standard P V assemblies (English photovoltaic module, photovoltaic module) series connection as DC source, 1 standard P V assembly contains 72 Cell (primary cell unit) and connects more.
The power output of PV assembly increases with intensity of illumination, and the output voltage of PV assembly raises with the temperature of assembly and reduces.During the series connection of 2 standard P V assemblies, MPPT maximum power point tracking MPPT (Maxium Power Point Track) the voltage Vmp when 25 ℃ of assembly temperatures is about 72V.And during from-40 ℃～80 ℃ range, to correspond to Vmp be 98.4V～49.6V to voltage during MPPT maximum power point tracking.The charging voltage that communication uses the 48V lead-acid batteries to require is: 43.2V～57.6V.
Like Fig. 4, the input point A of the boost module 1 of present embodiment external one group or the output of organizing the solar battery array (200) that is composed in series by 2 standard P V assemblies are connected with the anode of diode 3, an end of automatic switch 4 simultaneously more.The output point B of boost module 1 is connected with the input of step-down module 2, is connected with the negative electrode of diode 3, the other end of automatic switch 4 simultaneously.The output point C of step-down module 2 connects 48V lead-acid batteries or other type batteries and the communication equipment load approaching with 48V voltage.Controlling of sampling module 7 is gathered the voltage and current signal from A point, B point, C point respectively; Through sending the driver module 5 that boosts, step-down driver module 6 and the 4 closed or disconnections of control automatic switch after the processing operations, the driver module 5 that boosts is used for driving boost module 1, step-down driver module 6 is used for driving step-down module 2.
In the control method when controller of embodiment one is worked, comprise following several kinds of operating states:
Operating state 1:
When the controller of solar photovoltaic powered system starts; Controlling of sampling module 7 detects input voltages, when detecting Va more than or equal to Vr (this value according to environmental condition etc. can establish), automatic switch 4 closures; Boost module 1 is not worked; The beginning MPPT scanning of step-down module 2 is followed the tracks of and is operated in PV assembly peak power output point, is lower than the even charging voltage value Ve (like 56.4V) of setting when the output voltage of controller; It is enough big that expression communication equipment 9 loads and batteries 8 need the power output of controller to need, and then step-down module 2 is proceeded the MPPT operating state.
When solar components changed with intensity of illumination, assembly temperature, load or other reason, controller was in time adjusted the operating voltage point through the MPPT control mode, so that controller reaches maximum power output, maximum land productivity is with the output energy of photovoltaic module.
Operating state 2
When the controller output voltage reaches the bulk charge pressure point of setting; Expression communication equipment 9 loads and batteries 8 no longer need the power of full-amount MPPT control mode output; Step-down module 2 is transferred to the voltage stabilizing state of output voltage by the MPPT state; This moment output voltage stabilization, output current progressively reduces.
Operating state 3
When output voltage reaches even charging voltage value Ve, pick up counting, behind the certain hour t1, reduce output voltage to float charge voltage value Vf, promptly changeing all, the mode of filling is the floating charge mode.
Operating state 4
When three kinds of operating states of above-mentioned 1,2,3; Boost module 1 is closed; Just step-down module 2 work; When the difference that the input voltage that is based on controller is higher than input voltage and the output voltage of magnitude of voltage Vr of setting (establish 60～65V, this value can be established according to environmental condition etc.) or controller is higher than some set points (like 5V, this voltage difference is according to step-down module itself and duty optimization setting recently).If the input voltage of controller is lower than Vr; When simultaneously the difference of the input voltage of controller and output voltage is lower than some set points (like 5V, this voltage difference is according to step-down module itself and duty optimization setting recently), the boost module 1 and the step-down module 2 of controller all need work at this moment; Prime boost module 1 is started working; Automatic switch 4 breaks off, diode 3 blocking-up, the 2 voltage stabilizing work of back level step-down module; Prime boost module 1 adopts the alternately control of MPPT control mode and voltage regulation way, and the back level is a current limliting voltage stabilizing control mode.
Operating state 5
The condition that prime boost module 1 gets into the MPPT state is: when the duty ratio of back level step-down module 2 during greater than a certain set point D1; Duty ratio strengthens proof back level output current in the regulation loop action and is strengthening, and needs prime to carry out the power output that the MPPT state improves the PV assembly.
Operating state 6
The condition that prime boost module 1 withdraws from the MPPT state is: when the duty ratio of back level step-down module 2 during less than a certain set point D2; Output current was reducing when duty ratio was dwindled the level regulation loop work of proof back; Power output is reducing; Need prime to withdraw from the MPPT state, reduce the power output of PV assembly.
When prime boost module 1 withdraw from the MPPT control mode time, PV assembly output energy reduces, the duty ratio of back level step-down this moment module 2 can increase Δ D suddenly, for guaranteeing to need Δ D＜D1-D2 because the increase of Δ D does not get into the MPPT state again.Prime is got into MPPT to the duty ratio of i.e. expression back level step-down module 2 and to withdraw from MPPT different slightly, has one to return and stagnate, and time stagnant setting should retentive control device steady operation, can improve the utilance of DC source again.
If when the input voltage Va of controller is higher than Vr at this moment, then close boost module 1, diode 3 conductings, relay (being automatic switch 4) closure has only 2 work of back level step-down module this moment, gets back to operating state 1.
When if the input voltage Va of controller is lower than V2, then controller dormancy, communication equipment 9 loads institute energy requirement is all provided by batteries 8 discharges.
Among the embodiment one, said controller 100 is the step-down control mode with 2 standard package series connection as DC source input, controller or throws the formula of removing and compare that can improve solar energy utilization rate, the situation that specifically contrasts can be referring to technology contents shown in the table 1.
Table 1: adopt present embodiment and do not adopt the scheme comparison sheet of present embodiment:
Annotate: " 2 block assembly " is meant " 2 standard P V assembly series connection " abbreviation in the table 1, and " 3 block assembly " is meant " 3 standard P V assembly series connection " abbreviation.
When communication equipment need be the 24V electric power system time, then external PV assembly is 1 or the parallel connection of polylith standard package, export equal float charge voltage value, prime boost module work starting resistor all relatively the 48V system reduce by half.
When communication equipment need be the 12V electric power system time, then external PV assembly is the assembly parallel connection of 1 or 36 Cell series connection of polylith, exports equal float charge voltage value, prime boost module 1 work starting resistor is 1/4 of 48V system.
When the backup battery group is not that the nominal voltage value is the lead acid accumulator of 2V or 12V integral multiple, but during like other batteries such as lithium batteries, then in PV arrangement of components and the controller voltage setting according to the aforementioned proportion equivalence.
Embodiment two: a kind of control device of wind power generation electric power system and control method
Embodiment two as shown in Figure 5 is basic identical with the technical scheme of embodiment one shown in Figure 4; Distinctive points is, compares solar energy photovoltaic array 200 as DC source, among the embodiment two is to adopt blower fan power generation system 300 as power supply; The blower fan general output AC that generates electricity; Before the input of the controller 100 of wind energy electric power system, increase a rectification module 11 again, the electric power that blower fan is sent carries out being transformed into direct current after the rectification through rectification module.
The structure and the control method of follow-up control device 100, all with embodiment 1 in control device similar with control method.
Embodiment two through controller of the present invention, can improve the conversion efficiency of utilization ratio of wind energy and controller of fan itself owing to adopt the blower fan generating as DC source.
The above is merely embodiments of the invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (15)
1. the control device of a new energy system is characterized in that, comprising: boost module (1), and step-down module (2), diode (3), automatic switch (4), the driver module that boosts (5), step-down driver module (6), controlling of sampling module (7), wherein:
The output of the external DC source of input point (A) of said boost module (1) is connected with the anode of diode (3), first link of automatic switch (4) simultaneously;
The output point (B) of said boost module (1) is connected with the input of step-down module (2), is connected with the negative electrode of diode (3), second link of automatic switch (4) simultaneously;
The output point (C) of said step-down module (2) is connected to batteries and communication equipment load;
Said controlling of sampling module (7) is respectively from input point (A), the output point (B) of boost module (1); The output point (C) of step-down module (2) is gathered the voltage and current signal, through delivering to the closed of the driver module that boosts (5), step-down driver module (6) and control automatic switch (4) after the processing operations or breaking off;
The said driver module that boosts (5) is used for driving boost module (1), and said step-down driver module (6) is used for driving step-down module (2).
2. device as claimed in claim 1 is characterized in that,
Said boost module (1) is used for when the input voltage Va of input point (A) is lower than set point Vr, input voltage being boosted; Be used for when input voltage Va is higher than set point Vr, closes and not working.
3. device as claimed in claim 1 is characterized in that,
Said automatic switch (4) is used for conducting when the input voltage Va of input point (A) is higher than set point Vr, with boost module (1) short circuit.
4. device as claimed in claim 1 is characterized in that,
Said diode (3) is used at boost module (1) when closing and automatic switch (4) does not have conducting moment to give step-down module (2) power supply.
5. like claim 3 or 4 described devices, it is characterized in that,
Said step-down module (2) is used for when the input voltage Va of input point (A) is higher than set point Vr, and the input voltage that transmits through automatic switch (4) or diode (3) is carried out step-down; Be used for perhaps that the output voltage to boost module carries out step-down when the input voltage Va of input point (A) is lower than set point Vr.
6. device as claimed in claim 1 is characterized in that,
Said controlling of sampling module (7); Be used for input point (A) sampling input voltage and input current signal from boost module (1); The output point (B) of boost module (1) adopts the output current and the output voltage signal of output point (C) the sampling step-down module (2) of voltage signal, step-down module (2); Drive boost module (1) according to the driver module (5) that boosts of control after the electric current that obtains of sample and/or the voltage signal computing, control step-down driver module (6) drives step-down module (2); See the disconnected and logical of signal controlling automatic switch (4) off.
7. the control method of the control device of a new energy system is characterized in that, comprising:
The input voltage Va that controlling of sampling module (7) detects boost module (1) is when setting threshold voltage Vr; Automatic switch (4) closure; Boost module (1) is not worked, and controlling of sampling module (7) follows the tracks of being operated in DC source peak power output point through step-down driver module (6) control step-down module (2) beginning MPPT maximum power point tracking (MPPT) scanning; When the output voltage of controller is lower than the even charging voltage value Ve of setting, step-down module (2) is proceeded the MPPT operating state.
8. method as claimed in claim 7 is characterized in that, said method further comprises:
When the output voltage V c of step-down module (2) reached the even charging voltage value Ve of setting, step-down module (2) transferred the voltage stabilizing state to by MPPT maximum power point tracking (MPPT).
9. method as claimed in claim 8 is characterized in that, said method further comprises:
When the output voltage V c of step-down module (2) reaches even charging voltage value Ve, pick up counting, behind the certain hour t1, transfer the floating charge mode to by equal modes of filling, this moment, output voltage V c was reduced to float charge voltage value Vf.
10. like each described method in the claim 7 to 9, it is characterized in that said method further comprises:
The input voltage Va of the boost module (1) that samples when controlling of sampling module (7) is lower than when setting threshold voltage Vr and being higher than the lower voltage limit V2 of tolerance interval; When the difference of the output voltage V c of input voltage Va and boost module (2) is lower than the setting voltage difference simultaneously; Boost module (1) and step-down module (2) are all worked; Automatic switch (4) breaks off; Diode (3) blocking-up, boost module (1) are operated in alternately control between MPPT maximum power point tracking (MPPT) ring and the Voltage loop, step-down module (2) current limliting voltage stabilizing work.
11. method as claimed in claim 10 is characterized in that, the condition that is operated in MPPT maximum power point tracking (MPPT) state of said boost module (1) is: the duty ratio D of step-down module (2) is greater than setting dutyfactor value D1.
12. method as claimed in claim 10 is characterized in that, the condition that withdraws from MPPT maximum power point tracking (MPPT) state of said boost module (1) is: the duty ratio of step-down module (2) is less than setting dutyfactor value D2.
13. the control method of the control device of a new energy system is characterized in that, comprising:
The input voltage Va of the boost module (1) that samples when controlling of sampling module (7) is lower than when setting threshold voltage Vr and being higher than the lower voltage limit V2 of tolerance interval; When the difference of the output voltage V c of input voltage Va and step-down module (2) is lower than the setting voltage difference simultaneously; Boost module (1) and step-down module (2) are all worked; Automatic switch (4) breaks off; Diode (3) blocking-up, boost module (1) are operated in alternately control between MPPT maximum power point tracking (MPPT) ring and the Voltage loop, step-down module (2) current limliting voltage stabilizing work.
14. method as claimed in claim 13 is characterized in that, the condition that is operated in MPPT maximum power point tracking (MPPT) state of said boost module (1) is: the duty ratio D of step-down module (2) is greater than setting dutyfactor value D1.
15. method as claimed in claim 13 is characterized in that, the condition that withdraws from MPPT maximum power point tracking (MPPT) state of said boost module (1) is: the duty ratio of step-down module (2) is less than setting dutyfactor value D2.
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