CN104932603B - A kind of test system and method for photovoltaic controller MPPT maximum power point tracking precision - Google Patents

A kind of test system and method for photovoltaic controller MPPT maximum power point tracking precision Download PDF

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CN104932603B
CN104932603B CN201510244152.0A CN201510244152A CN104932603B CN 104932603 B CN104932603 B CN 104932603B CN 201510244152 A CN201510244152 A CN 201510244152A CN 104932603 B CN104932603 B CN 104932603B
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photovoltaic
maximum power
power point
variable load
photovoltaic controller
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CN104932603A (en
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李海鹏
齐曙光
施成营
贾骏
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Institute For Industry Standard Of Posts And Telecommunications Of Ministry Of Information And Industry Technology
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Institute For Industry Standard Of Posts And Telecommunications Of Ministry Of Information And Industry Technology
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    • 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
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

Abstract

The invention provides the test system and method for a kind of photovoltaic controller MPPT maximum power point tracking precision, described system includes photovoltaic simulator, variable load and accumulator;Wherein, described photovoltaic simulator is connected with photovoltaic controller to be tested, and described photovoltaic controller to be tested is connected with described variable load and described accumulator respectively, and described accumulator is in parallel with described variable load;Described photovoltaic simulator is for providing photovoltaic analog voltage and electric current for described photovoltaic controller to be tested;Described photovoltaic controller to be tested is used for controlling accumulator cell charging and discharging, described photovoltaic controller to be tested and described accumulator composition charge circuit, and described accumulator forms discharge loop with described variable load.Utilize the test system of the photovoltaic controller MPPT maximum power point tracking precision of the present invention, it is possible to measure the MPPT tracking accuracy of photovoltaic controller.

Description

A kind of test system and method for photovoltaic controller MPPT maximum power point tracking precision
Technical field
The present invention relates to field of photovoltaic power generation, be specifically related to a kind of photovoltaic controller maximum power point The test system and method for tracking accuracy.
Background technology
In recent years, research and the application of solar energy power generating make great progress, the sun One that the whole world attractes attention can be had become as there is far-reaching new industry by photovoltaic generation.But Owing to solar energy has the uncertain feature in intermittence, intensity and direction, to the collection of solar energy Bringing certain difficulty, long additionally, due to its investment payback time, photoelectric transformation efficiency is low, large area Promote and there is also certain difficulty.How to improve the efficiency of solar energy power generating and reduce cost, Become an important subject of this industry.
The output of solaode, is not stable, and is affected by temperature and illumination shadow Ring.Temperature often raises 1 degree, and the voltage of every piece of solaode about reduces 2mV;And photoelectric current Slightly rising with the increase of temperature, every about raising 1 degree, the electric current of every piece of solaode increases Adding 1 ‰, but generally speaking power drop, i.e. solaode often raise 1 degree, power just reduces 0.35‰。
MPPT photovoltaic controller is the vitals in solar cell power generation system, determine Under external condition, along with the change of load, solar battery array output also can change, But there is a maximum power point and the voltage and current corresponding with maximum power point, work as work When making environmental change, particularly when daylight illuminants and variation of ambient temperature, solar panel The output characteristic curve of array changes the most therewith, and corresponding maximum power point changes the most therewith, MPPT photovoltaic controller must detect the change of array output state at any time, sentences according to control strategy The position of disconnected maximum power point, the running voltage adjusting solar battery array follows the tracks of peak power Point voltage, makes solar battery array always work near maximum power point.
Understanding from the description above, the function of the MPPT of photovoltaic controller is for improving solar energy The utilization rate of the volt energy has important function.But, prior art does not also have a kind of test side Method is used for testing the MPPT tracking accuracy of photovoltaic controller, accordingly, it is desirable to provide a kind of test Method, to be used for testing the MPPT tracking accuracy of different photovoltaic controller, so that the sun Can select the photovoltaic controller that MPPT tracking accuracy is higher by battery generating system, and then make The generating efficiency obtaining solar cell power generation system is improved.
Summary of the invention
For defect of the prior art, the present invention provides a kind of photovoltaic controller maximum power point The test system and method for tracking accuracy, it is possible to measure the MPPT tracking accuracy of photovoltaic controller.
For solving above-mentioned technical problem, the present invention provides techniques below scheme:
First aspect, the invention provides a kind of photovoltaic controller MPPT maximum power point tracking precision Test system, including photovoltaic simulator, variable load and accumulator;
Wherein, described photovoltaic simulator is connected with photovoltaic controller to be tested, described to be tested Photovoltaic controller be connected with described variable load and described accumulator respectively, described accumulator with Described variable load is in parallel;
Described photovoltaic simulator is for providing photovoltaic simulation electricity for described photovoltaic controller to be tested Pressure and electric current;
Described photovoltaic controller to be tested is used for controlling accumulator cell charging and discharging, described to be tested Photovoltaic controller and described accumulator composition charge circuit, described accumulator and described variable load Composition discharge loop.
Wherein, described variable load is direct current variable load or exchange variable load.
Wherein, when described variable load is for exchange variable load, described test system also includes Inverter.
Wherein, described accumulator is single accumulator or accumulator battery.
Second aspect, present invention also offers one and utilizes photovoltaic controller recited above maximum The test of the photovoltaic controller MPPT maximum power point tracking precision of the test system of power points tracking accuracy Method, including:
S1. in described photovoltaic simulator, input default I-V curve, make described photovoltaic simulator Simulate real solar panel;Wherein, the maximum in described default photovoltaic I-V curve Power is Pm1, the voltage of its correspondence is Vpm1, electric current be Ipm1
S2. according to each device in the test system of described photovoltaic controller MPPT maximum power point tracking precision The annexation of part, carries out circuit connection by described photovoltaic controller to be tested;
S3. described photovoltaic controller to be tested is opened;
S4. open the output of described photovoltaic simulator, open described variable load and described accumulator, The most progressively regulate described variable load, monitor the I-V of the actual output of described photovoltaic simulator Curve, during confirming the regulation from low to high of described variable load, described photovoltaic simulator is actual The variation tendency of the maximum power point of output;
S5. during judging the regulation from low to high of described variable load, described photovoltaic simulator is actual The variation tendency of the maximum power point of output is with default I-V curve in load the most from low to high Change procedure in the variation tendency of maximum power point of output consistent, the most then perform step S6;
S6. judge whether described accumulator starts electric discharge, when described accumulator starts to discharge, Gu The output of fixed described variable load, it is determined that described photovoltaic controller to be tested has traced into High-power, obtain the maximum power value Pm of the actual output of now photovoltaic simulator2
S7. tracking accuracy η=Pm is obtained2/Pm1
Wherein, described method also includes:
When described accumulator starts to discharge, in preset time period, repeatedly obtain photovoltaic simulator The maximum power value of actual output;
Average value P m of the maximum power value repeatedly obtained described in calculating20
Obtain tracking accuracy η=Pm20/Pm1
Wherein, described preset time period is 5min.
Wherein, described method also includes:
The actual output of described photovoltaic simulator during the regulation from low to high of described variable load The variation tendency of maximum power point with the I-V curve preset in load change from low to high When the variation tendency of the maximum power point of output is inconsistent in journey, determine described photovoltaic to be tested Maximum power point failure followed the tracks of by controller.
As shown from the above technical solution, photovoltaic controller MPPT maximum power point tracking of the present invention The test system and method for precision, compensate for photovoltaic controller MPPT maximum power point tracking accuracy test Whether the blank of method, possess MPPT function by checking photovoltaic controller, advance solar energy Photovoltaic energy utilization rate.Calculating maximum power point work is observed the most easily by photovoltaic simulator Make situation, and only by its input, output voltage current value it may determine that MPPT controller Tracking performance, simple to operate, facilitate implementation.For different illumination and at a temperature of I-V defeated Enter curve, i.e. operate in the situation under different irradiance for solar panel, use this Photovoltaic controller MPPT maximum power point tracking method for testing precision described in embodiment can be convenient and swift Draw the MPPT maximum power point tracking precision of photovoltaic controller.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below The accompanying drawing used required in embodiment or description of the prior art will be briefly described, aobvious and Easily insight, the accompanying drawing in describing below is some embodiments of the present invention, common for this area From the point of view of technical staff, on the premise of not paying creative work, it is also possible to according to these accompanying drawings Obtain other accompanying drawing.
Fig. 1 is the photovoltaic controller MPPT maximum power point tracking precision that the embodiment of the present invention one provides The structural representation of test system;
Fig. 2 is the photovoltaic controller MPPT maximum power point tracking precision that the embodiment of the present invention two provides Method of testing flow chart;
Fig. 3 is the I-V curve schematic diagram preset of input in described photovoltaic simulator;
Fig. 4 and Fig. 5 shows the maximum power point using method described in the present embodiment two to trace into Result schematic diagram.
Detailed description of the invention
For making the purpose of the embodiment of the present invention, technical scheme and advantage clearer, below will knot Close the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, Complete description, it is clear that described embodiment be a part of embodiment of the present invention rather than Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having Make the every other embodiment obtained under creative work premise, broadly fall into present invention protection Scope.
Fig. 1 shows the photovoltaic controller maximum power point MPPT that the embodiment of the present invention one provides The structural representation of the test system of tracking accuracy, as it is shown in figure 1, the photovoltaic control of the present embodiment The test system of device MPPT maximum power point tracking precision processed includes: photovoltaic simulator, variable load and Accumulator;
Wherein, described photovoltaic simulator is connected with photovoltaic controller to be tested, described to be tested Photovoltaic controller be connected with described variable load and described accumulator respectively, described accumulator with Described variable load is in parallel;
Described photovoltaic simulator is for providing photovoltaic simulation electricity for described photovoltaic controller to be tested Pressure and electric current;
Described photovoltaic controller to be tested is used for controlling accumulator cell charging and discharging, described to be tested Photovoltaic controller and described accumulator composition charge circuit, described accumulator and described variable load Composition discharge loop.
Wherein, described variable load can be direct current variable load or exchange variable load.
Wherein, when described variable load is for exchange variable load, described test system also includes Inverter.
Wherein, described accumulator can be single accumulator or accumulator battery.
The test system of the photovoltaic controller MPPT maximum power point tracking precision described in the present embodiment is in work When making, described photovoltaic controller to be tested is the charging of described accumulator;Described light to be tested Volt controller also provides normal working voltage and electric current for described variable load;When described to be tested Photovoltaic controller can not provide normal working voltage and during electric current for described variable load, described Accumulator is discharged to described variable load.
Specifically, described photovoltaic controller to be tested is described variable load and described accumulator It is powered respectively and charges, along with the increase of described variable load, described photovoltaic to be tested Controller progressively provides bigger output for described load, with the normal work of satisfied load Demand.When photovoltaic controller can provide enough power to export for described load, it is not necessary to Described accumulator is discharged, simultaneously this section of output that also represent photovoltaic controller period It is in the rising stage.Along with the continuation of load increases, if accumulator described in a certain moment starts to put Electricity, then representing this moment photovoltaic controller can not provide enough power to export for described load, This means that photovoltaic controller to be tested has traced into maximum power point.
Photovoltaic controller MPPT maximum power point tracking accuracy test system described in the present embodiment, makes up The blank of photovoltaic controller MPPT maximum power point tracking method for testing precision, by checking photovoltaic control Whether device processed possesses the accurate following function of MPPT, advances photovoltaic energy utilization rate.
Photovoltaic controller MPPT maximum power point tracking accuracy test system described in the present embodiment is by becoming The output changing different photovoltaic simulators or control photovoltaic simulator can be measured not conveniently and efficiently Photovoltaic controller MPPT maximum power point tracking precision under same illumination, temperature or load.
Fig. 2 shows the photovoltaic controller MPPT maximum power point tracking essence that the embodiment of the present invention two provides The method of testing flow chart of degree.Seeing Fig. 2, method described in the present embodiment needs to utilize above-mentioned enforcement The test system of the photovoltaic controller MPPT maximum power point tracking precision described in example one, specifically, this The method of testing of the photovoltaic controller MPPT maximum power point tracking precision described in embodiment, including:
Step 101: input default I-V curve in described photovoltaic simulator, make described photovoltaic Real solar panel simulated by simulator;Wherein, in described default photovoltaic I-V curve Peak power be Pm1, its corresponding voltage is Vpm1, electric current be Ipm1
In this step, according to the difference of the load environment residing for photovoltaic controller to be tested, choosing Select the input-IV curve adapted.Such as, in described photovoltaic simulator, default I-V is inputted Curve, I-V curve (128points) the most as described in Figure 3.In this figure, Vpm1=87.08V, Ipm1=12.67A, Pm1=1103W.I-V curve shown in Fig. 3 with in certain particular light At a temperature of the I-V curve that tests out of actual solar panel completely the same.
In this step, different I-V curve can be inputted in described photovoltaic simulator, with Meet to different illumination and at a temperature of the test of MPPT maximum power point tracking precision of photovoltaic controller Demand.
Step 102: according to the test system of above-mentioned photovoltaic controller MPPT maximum power point tracking precision In the annexation of each device, described photovoltaic controller to be tested is carried out circuit connection.
Step 103: open described photovoltaic controller to be tested.
Step 104: open the output of described photovoltaic simulator, open described variable load and described storage Battery, the most progressively regulates described variable load, monitors described photovoltaic simulator reality defeated The I-V curve gone out, described photovoltaic mould during confirming the regulation from low to high of described variable load Intend the variation tendency of the maximum power point of the actual output of device.
Step 105: judge described photovoltaic simulation during the regulation from low to high of described variable load The variation tendency of the maximum power point of the actual output of device whether with default I-V curve load from In low to high change procedure, the variation tendency of the maximum power point of output is consistent, the most then hold Row step 106.
In this step, need to judge described in during the regulation from low to high of described variable load Whether the variation tendency of photovoltaic simulator actual Maximum Power Output point exists with default I-V curve In load change procedure from low to high, the variation tendency of the maximum power point of output is consistent, specifically Can judge, at this according to P-V curve corresponding with shown default I-V curve in Fig. 3 In P-V curve, it is shown that the maximum power point preset under different loads (sees P-V in Fig. 3 Round dot in curve).
During the regulation from low to high of described variable load, the output of described photovoltaic simulator Maximum power point in I-V curve is also being continually changing, it is judged that described photovoltaic controller is born in difference The power maximum point tracked under load whether overlap with the round dot in the P-V curve in Fig. 3 or Around these round dots, if, it is determined that in described variable load regulation process from low to high In, the variation tendency of the maximum power point of the actual output of described photovoltaic simulator and the maximum preset The variation tendency of power points is identical, namely described photovoltaic controller is in the mistake following the trail of power maximum point Journey does not has bigger deviation occur.
The actual output of described photovoltaic simulator during the regulation from low to high of described variable load The variation tendency of maximum power point with the I-V curve preset in load change from low to high When in journey, the variation tendency of the maximum power point of output is inconsistent, it may be determined that described to be tested Photovoltaic controller follows the tracks of maximum power point failure.
Especially, when the load increased is excessive, it is also possible to cause described photovoltaic simulator The peak power that the variation tendency of the maximum power point of actual output exports with the I-V curve preset The variation tendency of point is inconsistent, at this moment, cannot be judged to simply follow the tracks of unsuccessfully, needs to adjust Whole once load output, again monitor described photovoltaic simulator actual output I-V curve, observe The variation tendency of maximum power point.
Step 106: judge whether described accumulator starts electric discharge, if so, performs step 107.
Step 107: when described accumulator starts to discharge, the output of fixing described variable load, Judge that the most described photovoltaic controller to be tested has traced into maximum power point, obtain now The maximum power value Pm of the actual output of photovoltaic simulator2
In this step, when described accumulator starts to discharge, it is determined that described photovoltaic control to be tested Device processed has traced into maximum power point.The foundation so judged as:
Described photovoltaic controller to be tested is described variable load and described accumulator is carried out respectively Power supply and charging, along with the increase of described variable load, described photovoltaic controller is progressively described Load provides bigger output, with the normal work requirements of satisfied load.When photovoltaic control When device can provide enough power to export for described load, it is not necessary to described accumulator is put Electricity, this section of output that also represent photovoltaic controller period is in the rising stage simultaneously.Along with The continuation of load increases, if accumulator described in a certain moment starts electric discharge, then when representing this Carving photovoltaic controller can not provide enough power to export for described load, and this means that to be measured The photovoltaic controller of examination has traced into maximum power point wherein, Fig. 4 and Fig. 5 shows employing The result schematic diagram of the maximum power point that method described in the present embodiment traces into.
Step 108: obtain tracking accuracy η=Pm2/Pm1
Further, it is also possible in the following ways said method is improved, to obtain more Test result accurately:
In described accumulator starts the certain time of electric discharge, the output of described photovoltaic simulator May less stable, therefore when accumulator starts to discharge, (example within the default time period In 5min), the repeatedly peak power of (such as 10 times) acquisition actual output of photovoltaic simulator Value;
Average value P m of the maximum power value repeatedly obtained described in calculating20
Obtain tracking accuracy η=Pm20/Pm1
Photovoltaic controller MPPT maximum power point tracking method for testing precision described in the present embodiment, makes up The blank of photovoltaic controller MPPT maximum power point tracking method for testing precision, by checking photovoltaic control Whether device processed possesses the accurate following function of MPPT, advances photovoltaic energy utilization rate.
Photovoltaic controller MPPT maximum power point tracking method for testing precision described in the present embodiment, passes through Calculating maximum power point working condition observed the most easily by photovoltaic simulator, and only defeated by it Enter, output voltage current value it may determine that the tracking performance of MPPT controller, simple to operate, Facilitate implementation.
Operate in the situation of different temperature and illumination for solar panel, use this enforcement Photovoltaic controller MPPT maximum power point tracking method for testing precision described in example can obtain conveniently and efficiently Go out the MPPT maximum power point tracking precision of photovoltaic controller.
Above example is merely to illustrate technical scheme, is not intended to limit;Although With reference to previous embodiment, the present invention is described in detail, those of ordinary skill in the art It is understood that the technical scheme described in foregoing embodiments still can be modified by it, Or wherein portion of techniques feature is carried out equivalent;And these amendments or replacement, do not make The essence of appropriate technical solution departs from the spirit and scope of various embodiments of the present invention technical scheme.

Claims (7)

1. the photovoltaic control of the test system utilizing photovoltaic controller MPPT maximum power point tracking precision The method of testing of device MPPT maximum power point tracking precision processed, it is characterised in that described photovoltaic controller The test system of MPPT maximum power point tracking precision, including: photovoltaic simulator, variable load and storage Battery;
Wherein, described photovoltaic simulator is connected with photovoltaic controller to be tested, described to be tested Photovoltaic controller be connected with described variable load and described accumulator respectively, described accumulator with Described variable load is in parallel;
Described photovoltaic simulator is for providing photovoltaic simulation electricity for described photovoltaic controller to be tested Pressure and electric current;
Described photovoltaic controller to be tested is used for controlling accumulator cell charging and discharging, described to be tested Photovoltaic controller and described accumulator composition charge circuit, described accumulator and described variable load Composition discharge loop
The method of testing of described photovoltaic controller MPPT maximum power point tracking precision, including:
S1. in described photovoltaic simulator, input default I-V curve, make described photovoltaic simulator Simulate real solar panel;Wherein, the maximum in described default photovoltaic I-V curve Power is Pm1, the voltage of its correspondence is Vpm1, electric current be Ipm1
S2. according to each device in the test system of described photovoltaic controller MPPT maximum power point tracking precision The annexation of part, carries out circuit connection by described photovoltaic controller to be tested;
S3. described photovoltaic controller to be tested is opened;
S4. open the output of described photovoltaic simulator, open described variable load and described accumulator, The most progressively regulate described variable load, monitor the I-V of the actual output of described photovoltaic simulator Curve, during confirming the regulation from low to high of described variable load, described photovoltaic simulator is actual The variation tendency of the maximum power point of output;
S5. during judging the regulation from low to high of described variable load, described photovoltaic simulator is actual The variation tendency of the maximum power point of output is with default I-V curve in load the most from low to high Change procedure in the variation tendency of maximum power point of output consistent, the most then perform step S6;
S6. judge whether described accumulator starts electric discharge, when described accumulator starts to discharge, Gu The output of fixed described variable load, it is determined that described photovoltaic controller to be tested has traced into High-power, obtain the maximum power value Pm of the actual output of now photovoltaic simulator2
S7. tracking accuracy η=Pm is obtained2/Pm1
Method the most according to claim 1, it is characterised in that also include:
When described accumulator starts to discharge, in preset time period, repeatedly obtain photovoltaic simulator The maximum power value of actual output;
Average value P m of the maximum power value repeatedly obtained described in calculating20
Obtain tracking accuracy η=Pm20/Pm1
Method the most according to claim 2, it is characterised in that described preset time period is 5min。
Method the most according to claim 1, it is characterised in that also include: when described can The maximum power point of the actual output of described photovoltaic simulator during varying load regulation from low to high Variation tendency and the I-V curve preset in load change procedure from low to high, output is When the variation tendency of high-power point is inconsistent, determine that described photovoltaic controller to be tested is followed the tracks of The failure of high-power point.
Method the most according to claim 1, it is characterised in that described variable load is straight Stream variable load or exchange variable load.
Method the most according to claim 5, it is characterised in that when described variable load is During exchange variable load, described test system also includes inverter.
7. according to the method described in claim 1 or 6, it is characterised in that described accumulator is Single accumulator or accumulator battery.
CN201510244152.0A 2015-05-14 2015-05-14 A kind of test system and method for photovoltaic controller MPPT maximum power point tracking precision Expired - Fee Related CN104932603B (en)

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