CN102545698A - Tracking method for maximum power point of photovoltaic assembly - Google Patents
Tracking method for maximum power point of photovoltaic assembly Download PDFInfo
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Abstract
The invention discloses a tracking method for a maximum power point of a photovoltaic assembly, which includes the following steps: detecting open-circuit voltage Uoc; using a first step-length value delta U1 for changing a voltage value U1, searching an approximate maximum power value P'm in a set range, and simultaneously determining a corresponding voltage value U'm; starting from the voltage value U'm, using a second step-length value delta U2 smaller than the first step-length value delta U1 for changing a voltage value U2, measuring a corresponding current value of the changed voltage value, and calculating a corresponding actual power value P2; reducing the voltage value if (P2-P'm)/(U2-U'm)<0, namely when an actual power point is on the right side; increasing the voltage value if (P2-P'm)/(U2-U'm)>0, namely when an actual power point is on the left side; and leading the actual power point to be the actual maximum power point of the photovoltaic assembly if (P2-P'm)/(U2-U'm)=0. The tracking method for the maximum power point of the photovoltaic assembly can fast and accurately determine the maximum power point of the photovoltaic assembly.
Description
Technical field
The present invention relates to the photovoltaic power generation technology field, relate in particular to the maximum power point tracing method of photovoltaic module.
Background technology
In photovoltaic module; The variation of (radiation intensity, assembly temperature, ambient temperature, shade block, hot spot etc.) because environmental condition; The operating state of photovoltaic module is also changing at any time; Want to obtain array or assembly to the maximum power output of load, must carry out the MPPT maximum power point tracking (Maximum Power Point Tracking is called for short MPPT) under the real-time status condition photovoltaic module.
MPPT control come down to a dynamic optimization process, through detection, obtain the present output power of photovoltaic module to photovoltaic module current output voltage and electric current; It is compared with previous moment power; Then according to comparative result, change the working point, make its to maximum power point constantly near; So repeatedly, near the very small region reaching maximum power point.
At present, the MPPT technology is used widely in photovoltaic module.The MPPT control system mainly contains software control and is made up of DC-to-dc (DC-DC) translation circuit two parts that (Boost) or step-down (Buck) circuit that boosts is formed.Wherein software control has crucial effects to MPPT.
Present MPPT control mode has multiple; But mainly containing, basic control mode decides voltage-tracing method (CVT; Constant voltage Tracking), disturbance observation method (P&O, Perturbation and observation method); Conductance increment method (Incremental conductance method), other control mode all is on the basis of above three kinds of control modes, to have done suitable improvement.
Decide the voltage-tracing method and be a kind of maximum power point-tracing control method that operating voltage Um and open circuit voltage Uoc when utilizing the photovoltaic module Maximum Power Output exist approximate this characteristic of proportionate relationship to control.This way is simple, can not successfully manage but cause power to float to variations in temperature.Therefore can only follow the tracks of less being used roughly.The control method of deciding the voltage-tracing method is following:
Make Um=a*Uoc (a=0.70--0.83),
If U Um real work point on the left of maximum power point,
If U=Um real work point is at maximum power point,
If U>Um real work point is on the maximum power point right side.
The disturbance observation is the situation of change of coming comparison circuit adjustment front and back output power of photovoltaic module and output voltage through the operating state of continuous adjusting MPPT circuit; Adjust the work of MPPT circuit again according to situation of change; Photovoltaic module is operated near the maximum power point, and the MPPT circuit changes the output voltage or the electric current of photovoltaic module at each control cycle with smaller step size, can be that to increase also can be to reduce; Then; Through the power output of photovoltaic module before and after relatively should the cycle, if power output increases, the direction according to last one-period continues to change so; Reduce if detect power output, then change in the opposite direction.Like this, the real work point of photovoltaic array just can move closer to current maximum power point, and finally near it more back and forth reaches stable state.The control method of disturbance observation is following:
< 0 real work point is on the maximum power point right side as if dP/>dU
If dP/dU=0 real work point is at maximum power point
If dP/dU>0 real work point is on the left of maximum power point
The conductance increment method is the improvement to the disturbance observation.Its control thought and disturbance observation are similar, also are to utilize the direction of dP/dU to carry out MPPT maximum power point tracking control, and just photovoltaic device is operated in the maximum power point time control and is shaped on institute's difference.
Can find out that the control thought of above method is all based on following condition:
1, the form of I-U curve is when maximum power point squints and no change.
2, only there is an extreme point in the I-U curve, and is maximum power point.
In fact, photovoltaic module is when being blocked or being produced hot spot effect because of certain reason.Its tracing pattern possibly have greatly changed; Curve possibly produce two or more extreme points, in this case, and with above tracking; Just can not accomplish MPPT maximum power point tracking; Can only follow the tracks of that extreme point, and this extreme point might not be a maximum power point having on the I-U curve of many extreme points, thereby above tracking possibly lost efficacy near maximum power point before the system state change.
Summary of the invention
The object of the present invention is to provide a kind of maximum power point tracing method of photovoltaic module, make MPPT maximum power point tracking accurate.
For realizing above goal of the invention, the present invention adopts following technical scheme: a kind of maximum power point tracing method of photovoltaic module comprises the steps:
S1: the open circuit voltage Uoc that detects photovoltaic module;
S2: change magnitude of voltage U1 with the first step value ⊿ U1, the approximate maximum power value P'm of search determines the magnitude of voltage U'm that correspondence is similar to maximum power value P'm simultaneously in setting range;
S3: U'm begins from magnitude of voltage, to change magnitude of voltage U2 less than the second step-length value ⊿ U2 of the first step value ⊿ U1, measures the magnitude of voltage current corresponding value after the change, calculates corresponding actual power value P2;
If (P2-P'm)/(U2-U'm) < 0, then, actual power point reduces magnitude of voltage this moment on the maximum power point right side;
If (P2-P'm)/(U2-U'm)>0, then, actual power point increases magnitude of voltage this moment in the maximum power point left side;
If (P2-P'm)/(U2-U'm)=0, then, the actual power point of this moment is the actual maximum power point of photovoltaic module, maintains this magnitude of voltage work.
Further improve as method of the present invention, the range of choice of the first step value ⊿ U1 is 1% open circuit voltage Uoc to 10% open circuit voltage Uoc among the step S2.
Further improve as method of the present invention, among the step S2, said setting range hunting zone is that magnitude of voltage ends at open circuit voltage Uoc since 0.
Further improve as method of the present invention, definite method of the approximate maximum power value P'm among the step S2 is:
Initial approximation maximum power value P'm is set to 0;
Change magnitude of voltage U1 with the first step value ⊿ U1, record change back current corresponding value, calculate corresponding performance number P1;
< P'm then, makes P'm=P'm as if P1;
If P1=P'm then, makes P'm=P1;
If P1>P'm, then, make P'm=P1;
Note corresponding voltage value U'm simultaneously;
After the gamut search is accomplished, can confirm final approximate maximum power value P'm, and correspondent voltage value U'm.
Further improve as method of the present invention, further comprise step S4: repetitive cycling step S1-S3, to reach the dynamic optimization of actual maximum power value Pm.
Further improve as method of the present invention, between each repetitive cycling step S1-S3, have a delay time T.
Further improve as method of the present invention, the number range of this delay time T is 5 seconds≤delay time T≤2 minutes.
Further improve as method of the present invention, among the step S2, said setting range is that magnitude of voltage begins from 10%Uoc, ends at 90%Uoc.
Compared to prior art; Maximum power point tracing method of the present invention carries out the approximate maximum power point that global maximum power point detects the overall situation with big step-length earlier; Near approximate maximum work point, carry out accurate tracking with less step-length again, therefore, can have under the situation of a plurality of power extreme points at photovoltaic module; Trace into the overall maximum extreme point of photovoltaic module exactly; Avoid working point or trace point to be bound in all the time near a certain extreme point and can't detect the generation of other these situation of extreme point, thereby can follow the tracks of maximum power point accurately, in time, effectively, improved the generating efficiency of photovoltaic module.
Description of drawings
Fig. 1 is the performance diagram of photovoltaic module.
Fig. 2 is that temperature is the I-U performance diagram of 25 degrees centigrade of photovoltaic modulies under the different illumination intensity.
Fig. 3 is the I-U performance diagram of many extreme points.
Fig. 4 is the P-U performance diagram of many extreme points.
Fig. 5 is the maximum power point tracing method control flow chart of the photovoltaic module of first embodiment of the invention.
Fig. 6 is the maximum power point tracing method control flow chart of the photovoltaic module of second embodiment of the invention.
Fig. 7 is the structural representation of photovoltaic module of the present invention.
Fig. 8 is the structural representation of the MPPT controller of photovoltaic module of the present invention.
Embodiment
As shown in Figure 1, it has shown the characteristic curve of photovoltaic module, as can be seen from Figure 1; Photovoltaic module volt-ampere I/U characteristic curve has strong nonlinear, and it is neither stiff, also non-constant current supply; Can not be a kind of non-linear DC power supply for load provides arbitrarily big power P also, its output current is approximately constant in most of operating voltage range; Near open circuit voltage the time, the electric current rate of descent is very big.Photovoltaic module exists an open-circuit voltage values Uoc and a short-circuit current value Isc.There is a maximum power point performance number Pm in theory in photovoltaic module, at this moment
CorrespondingMaximum power point voltage value Um and maximum power point current value I m.
As shown in Figure 2, it has shown under temperature is 25 degrees centigrade situation, the I-U performance diagram of the photovoltaic module under the different illumination intensity, and as can be seen from Figure 2, along with the increase of intensity of illumination, maximum power value is also increasing.
Like Fig. 3 and shown in Figure 4, in the actual use of photovoltaic module, possibly there is the situation of a plurality of power points peak values, in the present embodiment, only draw two peak value Pm1 and Pm2 are as signal.
Please join shown in Figure 5; It is the maximum power point tracing method of the photovoltaic module 10 of first embodiment of the invention; This method mainly contains two big control strategies and accomplishes; Wherein first control strategy is for to search with the first step value ⊿ U1 within the specific limits, determining approximate maximum power point Pm', and determines corresponding voltage value Um'; Second control strategy is near second step-length value ⊿ U2 accurate tracking approximate maximum power point P'm of using less than the first step value ⊿ U1, thereby confirms the maximum power point P'm of photovoltaic module 10.
Said first control strategy comprises the steps:
1.1 detect the open circuit voltage Uoc of photovoltaic module 10;
1.2 confirm detection range, in the present embodiment, certain limit is 0 for the starting voltage value, the final voltage value is Uoc;
1.3 confirm the first step value ⊿ U1, in the present embodiment, the span of the first step value ⊿ U1 be 1%Uoc to 10%Uoc;
1.4 make magnitude of voltage U1=0; The approximate maximum power value P'm=0 of order;
1.5 detect the corresponding output current of this magnitude of voltage U1, calculate the corresponding power P 1 of this magnitude of voltage U1;
1.6 if < P'm then, makes P'm=P'm to P1, continues next point and detects relatively;
If P1=P'm then, makes P'm=P1, continue next point and detect relatively;
If P1>P'm, then, make P'm=P1, note corresponding voltage value U'm simultaneously, continue next point and detect relatively;
Whether equal Uoc 1.7 detect magnitude of voltage U1:
If magnitude of voltage U1 less than Uoc, then continues to increase magnitude of voltage U1 with the first step value ⊿ U1, and comes back to step 1.5, begin with new magnitude of voltage U1 execution in step 1.5-1.7 again from step 1.5 again;
If magnitude of voltage U1 equals Uoc, then, first control strategy is accomplished, and finds the approximate maximum P'm of photovoltaic module 10, and corresponding voltage value U'm.
Then begin second control strategy, said second control strategy comprises the steps:
2.1 near magnitude of voltage U'm, change magnitude of voltage U2 with the second step-length Zhi ⊿ U2;
2.2 detect the corresponding output current of this current magnitude of voltage U2, calculate the corresponding performance number P2 of this magnitude of voltage;
If (P2-P'm)/(U2-U'm) < 0, then, actual power point reduces magnitude of voltage this moment on the maximum power point right side;
If (P2-P'm)/(U2-U'm)>0, then, actual power point increases magnitude of voltage this moment in the maximum power point left side;
If (P2-P'm)/(U2-U'm)=0, then, the actual power point of this moment is the actual maximum power point of photovoltaic module 10, maintains this magnitude of voltage work.
The maximum power point tracing method of the photovoltaic module 10 of first embodiment of the invention also comprises step 3: repetitive cycling step 1.1-2.2, and to reach the dynamic optimization of actual maximum power point.
Under actual conditions; Be difficult to find the situation of (P2-P'm)/(U2-U'm)=0, the ratio that more situation is (P2-P'm)/(U2-U'm) levels off to 0, therefore in actual use; Can stipulate a value a; A be one greater than zero numerical value, when ︱ (P2-P'm)/(U2-U'm) ︱ < during a, then can think to trace into maximum power point.If it is excessive that a is provided with, then follow the tracks of inaccuracy, too small if a is provided with, then the CPU of system is busy with calculating, and power output does not have too big variation, so the setting of a can be decided according to the situation of reality.Therefore, in actual the use, if (P2-P'm)/>(U2-U'm)<-a, then, actual power point reduces magnitude of voltage this moment on the maximum power point right side; If (P2-P'm)/(U2-U'm)>A, then, actual power point increases magnitude of voltage this moment in the maximum power point left side; If-a ≦ (P2-P'm)/(U2-U'm) ≦<b >a</b>, then, the actual power point of this moment maintains this magnitude of voltage work for the actual maximum power point of photovoltaic module 10.Be that 0 among the application is not 0 in the mathematical meaning, should be more than or equal to-a, represent for ease and write as 0 smaller or equal to the numerical value in a scope.
The maximum power point tracing method of the photovoltaic module 10 of first embodiment of the invention also comprises: between repetitive cycling step 1.1.-2.2; Also has a delay time T; This delay time T can be defined between 5 seconds to 2 minutes; Especially, delay time T is set between 5 seconds to 50 seconds will reaches preferable effect.
Please join shown in Figure 6; It is the maximum power point tracing method of the photovoltaic module 10 of second embodiment of the invention; This method mainly contains two big control strategies and accomplishes; Wherein first control strategy is for to search with the first step value ⊿ U1 within the specific limits, determining approximate maximum power point Pm', and determines corresponding voltage value Um'; Second control strategy is near second step-length value ⊿ U2 accurate tracking approximate maximum power point P'm of using less than the first step value ⊿ U1, thereby confirms the maximum power point P'm of photovoltaic module 10.
Said first control strategy comprises the steps:
1.1 detect the open circuit voltage Uoc of photovoltaic module 10;
1.2 confirm detection range, in the present embodiment, certain limit is 10%Uoc for the starting voltage value, the final voltage value is 90%Uoc;
1.3 confirm the first step value ⊿ U1, in the present embodiment, the span of the first step value ⊿ U1 be 1%Uoc to 10%Uoc;
1.4 (Pulse Width Modulation, duty ratio PMW) make magnitude of voltage U1=10%Uoc to regulate pulse-width signal;
1.5 detect the corresponding output current of this magnitude of voltage U1, calculate the corresponding power P 1 of this magnitude of voltage U1;
1.6 call subroutine one, subprogram one comprises the steps:
Initialization is similar to maximum power value P'm, the approximate maximum power value P'm=0 of order;
If P1>P'm, then, make P'm=P1, continue next point and detect relatively;
If P1=P'm then, makes P'm=P1, continue next point and detect relatively;
If < P'm then, makes P'm=P'm to P1, notes corresponding voltage value U'm simultaneously, continues next point and detects relatively;
Whether equal 90%Uoc 1.7 detect magnitude of voltage U1:
If magnitude of voltage U1 is less than 90%Uoc; Then regulate pulse-width signal (Pulse Width Modulation; PMW) duty ratio; Continuation increases magnitude of voltage U1 with the first step value ⊿ U1, and comes back to step 1.5, begins with new magnitude of voltage U1 execution in step 1.5-1.7 again from step 1.5 again;
If magnitude of voltage U1 equals 90%Uoc, then, first control strategy is accomplished, and finds the approximate maximum P'm of photovoltaic module 10, and corresponding voltage value U'm.
Then begin second control strategy, said second control strategy comprises the steps:
2.1 (Pulse Width Modulation, duty ratio PMW) make magnitude of voltage U2=U'm+ ⊿ U2 to regulate pulse-width signal;
2.2 detect the corresponding output current of this current magnitude of voltage U2, calculate the corresponding performance number P2 of this magnitude of voltage;
2.3 call subroutine two, subprogram two comprises the steps:
Initialization Pm=P'm; The magnitude of voltage that last time records representes with U'2,
Work as P2>Pm,
If U2>U'2, then, actual power point is in the maximum power point left side, and this moment, forward changed magnitude of voltage U2;
If U U'2, then, actual power point oppositely changes magnitude of voltage U2 this moment on the maximum power point right side;
When P2 Pm,
If U2>U'2, then, actual power point oppositely changes magnitude of voltage U2 this moment on the maximum power point right side;
If U2 U'2, and then, actual power point is in the maximum power point left side, and this moment, forward changed magnitude of voltage U2;
2.4 judge whether (P2-Pm)/(U2-U'2) equals 0, and promptly whether dP/dU2 equals 0:
If be not equal to 0; Then, regulate pulse-width signal (Pulse Width Modulation, duty ratio change magnitude of voltage U2 PMW); Simultaneously according to the judgement in the subprogram two; Confirm that the forward increase still is oppositely to reduce the second step-length value ⊿ U2, and come back to step 2.2, carry out 2.2-2.4 from step 2.2 beginning again with new magnitude of voltage U2 again;
If equal 0, then, the actual power point P2 of this moment is the maximum power point Pm of photovoltaic module 10.
The maximum power point tracing method of the photovoltaic module 10 of second embodiment of the invention also comprises step 3: repetitive cycling step 1.1-2.4, and to reach the dynamic optimization of actual maximum power point.
Under actual conditions; Be difficult to find the situation of (P2-Pm)/(U2-U'2)=0, the ratio that more situation is (P2-Pm)/(U2-U'2) levels off to 0, therefore in actual use; Can stipulate a value a; A be one greater than zero numerical value, when-a≤(P2-Pm)/(U2-U'2)≤a, both can think to trace into maximum power point.If it is excessive that a is provided with, then follow the tracks of inaccuracy, too small if a is provided with, then the CPU of system is busy with calculating, and power output does not have too big variation, so the setting of a can decide according to the situation of reality, representes for ease in the present invention and is write as 0.
The maximum power point tracing method of the photovoltaic module 10 of second embodiment of the invention also comprises: between repetitive cycling step 1.1.-2.4; Also has a delay time T; This delay time T can be defined between 5 seconds to 2 minutes; Especially, delay time T is set between 5 seconds to 50 seconds will reaches preferable effect.
In the present invention, this method also can be included in extraneous intensity of illumination or variation of temperature amount, and system's decision starts the maximum power value optimizing once more.Thereby make photovoltaic module 10 of the present invention be operated near the maximum power value, to promote the generating efficiency of photovoltaic module 10 always.
In two embodiment of the present invention, about the selection of the first step-length ⊿ U1 and long ⊿ U2 of second step, if select bigger; Then can confirm the Position Approximate of maximum power point very soon; The tracking velocity of raising system if selection is less, then can more accurately be followed the tracks of maximum power point Pm; Certainly, also can reduce the tracking velocity of system.
Compared to prior art; Maximum power point tracing method of the present invention carries out the approximate maximum power point that global maximum power point detects the overall situation with big step-length earlier; Near approximate maximum work point, carrying out accurate tracking with less step-length, therefore, can have under the situation of a plurality of power extreme points at photovoltaic module 10; Trace into the overall maximum extreme point of photovoltaic module 10 exactly; Avoid working point or trace point to be bound in all the time near a certain extreme point and can't detect the generation of other these situation of extreme point, thereby can follow the tracks of maximum power point accurately, in time, effectively, improved the generating efficiency of photovoltaic module 10.
As shown in Figure 7, be the system configuration of photovoltaic module 10 of the present invention, it comprises photovoltaic module 10, MPPT controller 20, DC-DC converter 30 and the load 40 that is connected with DC-DC converter 30.Said MPPT controller 20 can detect the voltage and current of photovoltaic module 10.Photovoltaic module 10 all is connected 30 with the DC-DC converter with MPPT controller 20.
As shown in Figure 8 is the principle schematic of MPPT controller 20 of the present invention, and it mainly comprises signals collecting part 21, ADC conversion 22, MCU single-chip microcomputer 23, switching tube 24 and DC-DC networking 25.
Said signals collecting part 21 mainly is voltage signal and current signals, and wherein, the collection of voltage signal can be adopted divider resistance, and current signals can adopt Hall current sensor; And to obtain voltage, current analog signal is handled.
Said ADC changes 22 parts and converts voltage, current analog signal to digital signal
Calculating, control centre that said MCU single-chip microcomputer 23 is systems.It is according to the program requirement, and numerical value such as calculating, comparative voltage, power, and require to make the selection of control strategy according to program, and the conducting state through the various Signal-controlled switch pipes 24 of output with adjustment voltage, thereby reach the purpose of adjustment power.MCU calculates power according to P=I*U.
Said switching tube 24 and DC-DC networking 25 are performers of power adjustment, said switching tube 24 and the 25 common adjustment of accomplishing voltage or power of DC-DC networking.
The current and voltage signals that MPPT controller 20 is gathered from photovoltaic module 10 can be used for other miscellaneous functions of system.
In sum; More than be merely preferred embodiment of the present invention; Should not limit scope of the present invention with this, promptly every simple equivalent of being done according to claims of the present invention and description of the invention content changes and modifies, and all should still belong in the scope that patent of the present invention contains.
Claims (8)
1. the maximum power point tracing method of a photovoltaic module is characterized in that, comprises the steps:
S1: the open circuit voltage Uoc that detects photovoltaic module;
S2: change magnitude of voltage U1 with the first step value ⊿ U1, the approximate maximum power value P'm of search determines the magnitude of voltage U'm that correspondence is similar to maximum power value P'm simultaneously in setting range;
S3: U'm begins from magnitude of voltage, to change magnitude of voltage U2 less than the second step-length value ⊿ U2 of the first step value ⊿ U1, measures the magnitude of voltage current corresponding value after the change, calculates corresponding actual power value P2;
If (P2-P'm)/(U2-U'm) < 0, then, actual power point reduces magnitude of voltage this moment on the maximum power point right side;
If (P2-P'm)/(U2-U'm)>0, then, actual power point increases magnitude of voltage this moment in the maximum power point left side;
If (P2-P'm)/(U2-U'm)=0, then, the actual power point of this moment is the actual maximum power point of photovoltaic module, maintains this magnitude of voltage work, and the duration is T.
2. the maximum power point tracing method of photovoltaic module as claimed in claim 1, it is characterized in that: the range of choice of the first step value ⊿ U1 is 1% open circuit voltage Uoc to 10% open circuit voltage Uoc among the step S2.
3. the maximum power point tracing method of photovoltaic module as claimed in claim 1, it is characterized in that: among the step S2, said setting range hunting zone is that magnitude of voltage ends at open circuit voltage Uoc since 0.
4. the maximum power point tracing method of photovoltaic module as claimed in claim 1, it is characterized in that: definite method of the approximate maximum power value P'm among the step S2 is:
Initial approximation maximum power value P'm is set to 0;
Change magnitude of voltage U1 with the first step value ⊿ U1, record change back current corresponding value, calculate corresponding performance number P1;
< P'm then, makes P'm=P'm as if P1;
If P1=P'm then, makes P'm=P1;
If P1>P'm, then, make P'm=P1;
Note corresponding voltage value U'm simultaneously;
After the gamut search is accomplished, can confirm final approximate maximum power value P'm, and correspondent voltage value U'm.
5. the maximum power point tracing method of photovoltaic module as claimed in claim 1 is characterized in that: further comprise step S4: repetitive cycling step S1-S3, and to reach the dynamic optimization of actual maximum power value Pm.
6. the maximum power point tracing method of photovoltaic module as claimed in claim 5 is characterized in that: between each repetitive cycling step S1-S3, have a delay time T.
7. the maximum power point tracing method of photovoltaic module as claimed in claim 6 is characterized in that: the number range of this delay time T is 5 seconds≤delay time T≤2 minutes.
8. the maximum power point tracing method of photovoltaic module as claimed in claim 1, it is characterized in that: among the step S2, said setting range is that magnitude of voltage begins from 10%Uoc, ends at 90%Uoc.
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| CN102811000A (en) * | 2012-07-18 | 2012-12-05 | 奇瑞汽车股份有限公司 | Photovoltaic power generating system, maximal power point tracking method thereof and tracking device |
| CN102811000B (en) * | 2012-07-18 | 2015-08-12 | 奇瑞汽车股份有限公司 | Photovoltaic generating system, its maximum power point tracing method and tracking means |
| CN102929325A (en) * | 2012-11-28 | 2013-02-13 | 河海大学 | Method for tracking maximum power of high-accuracy single-stage photovoltaic power generation system |
| CN104142703A (en) * | 2014-08-18 | 2014-11-12 | 南京航空航天大学 | Output power acquiring method applicable to difference photovoltaic unit series circuit |
| CN104142703B (en) * | 2014-08-18 | 2015-12-02 | 南京航空航天大学 | A kind of output power acquisition methods being applicable to otherness photovoltaic cells series circuit |
| CN107104499A (en) * | 2017-04-26 | 2017-08-29 | 安徽机电职业技术学院 | The output control method of photovoltaic module peak power |
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