CN103323719A - Test method of photovoltaic inverter single-path MPPT - Google Patents
Test method of photovoltaic inverter single-path MPPT Download PDFInfo
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Abstract
The invention discloses a test method of photovoltaic inverter single-path MPPT. The method comprises a step of a static test. In the step of the static test, a solar simulator is used to set the input voltage of a photovoltaic inverter and the input power of the photovoltaic inverter, the MPPT efficiency of the photovoltaic inverter in the combination of various input voltages and input powers is tested, in the combination, the input voltages of the photovoltaic inverter comprise an MPPT minimum working voltage Vmin, a rated working voltage Vnom and a maximum working voltage Vmax of the photovoltaic inverter, the powers of the photovoltaic inverter comprises a full load input power Pin and 5% of the full load input power Pin of the photovoltaic inverter. The test method of the invention has the advantages of high efficiency and reliability.
Description
Technical field
The present invention relates to the photovoltaic field, refer more particularly to the method for testing of a kind of photovoltaic DC-to-AC converter single channel MPPT.
Background technology
At present along with the widespread use of sun power, most photovoltaic DC-to-AC converter has all possessed MPPT(Maximum Power Point, maximum power point) function.The maximum trace point of so-called photovoltaic generation is followed the tracks of (MPPT), refer in photovoltaic generating system, the utilization factor of photovoltaic cell except with the bulk properties of photovoltaic cell by outside the Pass, the impact of also receiving the factors such as environment for use such as irradiance, load and temperature.Under different external condition, photovoltaic DC-to-AC converter operates on different and unique maximum power point (MPPT).Therefore, for photovoltaic generating system, should seek the optimum Working of cell panel, carry out to greatest extent opto-electronic conversion.
Because the energy of sun power is directly affected by the intensity of illumination of the sun, so MPPT is subjected to the illumination power of the sun to change and change.How could effectively become tester's a great problem with reliable test photovoltaic DC-to-AC converter.Most of method of testings generally all adopt randomness to finish.Randomness is exactly input voltage vin or the MPPT operating voltage Voc of random adjustment solar inverter, the power input Pin of random adjustment solar inverter or maximumly follow the tracks of the test that power points Pmp goes to finish MPPT efficient.Test on this all exists MPPT voltage and power not to have the leak of Complete test, and tests also more complicated.These methods are tested confusion again blindly, and testing efficiency is not high yet, and the factor of merit of product has also been reduced, and has greatly wasted the time on manpower.
Summary of the invention
Be to solve the problems referred to above of prior art, be necessary to provide the method for testing of a kind of photovoltaic DC-to-AC converter single channel MPPT of high efficient and reliable.
The technical scheme that technical solution problem of the present invention provides is:
The method of testing of a kind of photovoltaic DC-to-AC converter single channel MPPT, it comprises the step of static test, in the step of static test, the power input of input voltage and the photovoltaic DC-to-AC converter of photovoltaic DC-to-AC converter is set with solar simulator, the MPPT efficient of test photovoltaic DC-to-AC converter under input voltage and the various combinations of power input, in described combination, the input voltage of photovoltaic DC-to-AC converter comprises the minimum operating voltage Vmin of the MPPT of photovoltaic DC-to-AC converter, rated operational voltage Vnom, maximum operating voltage Vmax, the power of photovoltaic DC-to-AC converter comprise the fully loaded power input Pin of photovoltaic DC-to-AC converter and 5% fully loaded power input Pin.
Wherein, in the step of described static test, the power input that further with solar simulator photovoltaic DC-to-AC converter is set changes successively from 5% full-load power, 25% full-load power, 50% full-load power, 75% full-load power, 100% full-load power, the MPPT efficient of test when input voltage is rated operational voltage Vnom.
Wherein, in the step of described static test, the power input that further with solar simulator photovoltaic DC-to-AC converter is set changes successively from 100% full-load power, 75% full-load power, 50% full-load power, 25% full-load power, 5% full-load power, the MPPT efficient of test when input voltage is rated operational voltage Vnom.
Wherein, the power input that further with solar simulator photovoltaic DC-to-AC converter is set is 5% full-load power, the MPPT efficient when the test setting input voltage is minimum operating voltage Vmin.
Wherein, the input voltage of test and power transfer sequentially are: Vmin voltage and 5% Pin power; Vnom voltage and 5% Pin power; Vmax voltage and 5% Pin power; Vmax voltage and 100% Pin power; Vnom voltage and 100% Pin power; Vmin voltage and 100% Pin power.
Wherein, the input voltage of test and power transfer sequentially are: Vmin voltage and 5% Pin power; Vmin voltage and 100% Pin power; Vnom voltage and 100% Pin power; Vmax voltage and 100% Pin power; Vmax voltage and 5% Pin power; Vnom voltage and 5% Pin power.
Wherein, the method for testing of described photovoltaic DC-to-AC converter single channel MPPT further comprises the step of dynamic test, and the step of described dynamic test comprises:
With solar simulator the maximum voltage Voc that follows the tracks of power points of solar inverter, the maximum power P mp that follows the tracks of power points are set respectively;
Solar inverter is set powers on from start, rise to maximum and follow the tracks of power points Pmp required time, and arrive the maximum tracking stable time of power points Pmp, and drop to the time required when shutting down;
Adopt above-mentioned setting, when inverter works, automatically record the MPPT efficient of each point;
According to test result analysis with judge whether to satisfy specification requirement.
Compared with prior art, the method of testing of photovoltaic DC-to-AC converter single channel MPPT of the present invention has been simulated the test of solar panel at the various limit points that are subjected to sunshine, also simulation test rise to the process of whereabouts at the sun, effectively tested photovoltaic DC-to-AC converter in each limit and MPPT efficient in typical case.
Description of drawings
Fig. 1 is the static test process flow diagram of method of testing of the present invention;
Fig. 2 is the schematic diagram that puts in order of a kind of MPPT test point of the present invention;
Fig. 3 is the schematic diagram that puts in order of another kind of MPPT test point of the present invention;
Fig. 4 is the dynamic test process flow diagram of method of testing of the present invention;
Fig. 5 is a kind of MPPT dynamic operation geometric locus figure of the present invention;
Fig. 6 is another kind of MPPT dynamic operation curve map of the present invention.
Embodiment
Below in conjunction with drawings and Examples invention is described in detail.
The method of testing of photovoltaic DC-to-AC converter single channel MPPT of the present invention comprises the test of static test and dynamic test two states, thereby comprehensively tests the MPPT efficient of solar inverter under various states.
As shown in Figure 1, the static test flow process of described MPPT may further comprise the steps:
Step S01 arranges respectively the input voltage vin of photovoltaic DC-to-AC converter with solar simulator, Vin voltage comprises the minimum operating voltage of the MPPT of photovoltaic DC-to-AC converter (Vmin), rated operational voltage (Vnom) and maximum operating voltage (Vmax) thereof;
Step S02 arranges the fully loaded power input Pin of photovoltaic DC-to-AC converter, and namely Pin is equal to or greater than the peak power output of photovoltaic DC-to-AC converter;
Step S03 with the parameter that just now set, selects the power points (minimum power input Pin is generally 5%) of the power input Pin of Vmin voltage and 5%; Begin start, this parameter testing the MPPT efficient of photovoltaic DC-to-AC converter in the extremely weak situation of sun power;
Step S04 tests the MPPT of each point; Described photovoltaic DC-to-AC converter is comprised of single channel MPPT, in this step, be the voltage that produced by solar panel and power (electric current that solar panel produces) respectively combination finish, thereby the energy variation process of analog solar cell panel;
Step S05, record is the MPPT efficient of each test point just now;
Step S06 is according to test result analysis with judge whether to satisfy specification requirement;
Step S07, the lower electricity of shutdown, test finishes.
In implementation, because the energy that solar panel provides changes at any time.As shown in Figure 2, in step 04, test point can change by following order tests.At first press the flow testing of dotted arrow, when input voltage vin is the stable point IL1 of Pin power of Vmin and 5%; Change to the some OL2 of the Pin power of Vnom voltage and 5%; Change to the Vmax voltage of Vin and the some AL3 of 5% Pin power; Change to the Vmax voltage of Vin and the some AH3 of 100% Pin power; Change to the Vnom voltage of Vin and the some OH2 of 100% Pin power; Change to the Vmin voltage of Vin and the some IH1 of 100% Pin power.Because photovoltaic DC-to-AC converter generally can derate when low pressure, this moment Vin Vmin voltage and 100% power among the some IH1 of 100% Pin power be the maximum workable power of machine low pressure itself.And test record is in the MPPT of each some efficient.This has tested from the low pressure miniwatt to the high pressure miniwatt high pressure full power again to the conversion of low pressure full power again.The MPPT efficiency test of the first round is finished.
After first round test is finished, again begin second by the flow testing of solid arrow and take turns test, when the stable point IL1 at the Pin of the Vmin of Vin voltage and 5% power; Change to the Vmin voltage of Vin and the some IH1 of 100% Pin power; Change to the Vnom voltage of Vin and the some OH2 of 100% Pin power; Change to the Vmax voltage of Vin and the some AH3 of 100% Pin power; Change to the Vmax voltage of Vin and the some AL3 of 5% Pin power; Change to the Vnom voltage of Vin and the some OL2 of 5% Pin power.Because photovoltaic DC-to-AC converter generally can derate when low pressure, this moment Vin Vmin voltage and 100% power among the some IH1 of 100% Pin power be the maximum workable power of machine low pressure itself.And test record is in the MPPT of each some efficient.This has tested by the low pressure miniwatt to the low pressure full power to the high pressure full power to the high pressure miniwatt again to the low power conversion of low pressure.
Above-described MPPT has tested at solar panel in the impact on photovoltaic DC-to-AC converter of the state of each limit.
In implementation, because the energy (electric current or power) of solar panel mainly is the impact that is subjected to sunshine, and sunshine is little to the voltage influence that solar panel offers photovoltaic DC-to-AC converter.The present invention provides the testing sequence of another kind of MPPT test point again, as shown in Figure 3, at first presses the flow testing of solid arrow, when the stable point IL1 at the Pin of the Vmin of Vin voltage and 5% power; Change to the Vnom voltage of Vin and the some OL2 of 5% Pin power; Change to the Vnom voltage of Vin and the some OL3 of 25% Pin power; Change to the Vnom voltage of Vin and the some OL4 of 50% Pin power; Change to the Vnom voltage of Vin and the some OL5 of 75% Pin power; Change to the Vnom voltage of Vin and the some OH2 of 100% Pin power, and test record is in the MPPT of each some efficient.The test simulation of epicycle the process that slowly rises of the sun, namely simulated each static change process at morning to noon.
Then carry out the next round test, press again the flow testing of dotted arrow, as the some OH2 at the Pin of the Vnom of Vin voltage and 100% power; Change to the Vnom voltage of Vin and the some OL5 of 75% Pin power; Change to the Vnom voltage of Vin and the some OL4 of 50% Pin power; Change to the Vnom voltage of Vin and the some OL3 of 25% Pin power; Change to the Vnom voltage of Vin and the some OL2 of 5% Pin power; Change to the Vmin voltage of Vin and the some IL1 of 5% Pin power, and test record is in the MPPT of each some efficient.The test simulation of epicycle the process that slowly descends of the sun, namely simulated noon to each static change process at dusk.
As shown in Figure 4, in dynamic test, the testing process of described MPPT may further comprise the steps;
Step S08 arranges respectively the maximum voltage Voc that follows the tracks of power points of solar inverter, the maximum power P mp that follows the tracks of power points with solar simulator;
Step S09 arranges solar inverter and powers on from start, rises to maximum and follows the tracks of power points Pmp required time, and arrive the maximum tracking stable time of power points Pmp, and drop to the time required when shutting down; In implementation, as shown in Figure 5, power on from start, rising to maximum tracking power points Pmp required time is 2min, and the stable time is 4min behind the maximum tracking of the arrival power points Pmp, and the required time is 2min when dropping to shutdown.This test simulation the sun rise to the dynamic changing process of whereabouts;
Step S10 begins start;
Step S11, during the inverter normal operation, the MPPT efficient of each point is recorded in beginning automatically;
Step S12 is according to test result analysis with judge whether to satisfy specification requirement;
Step S13, the lower electricity of shutdown, test finishes.
In implementation, as shown in Figure 6, be a kind of dynamic operation geometric locus figure of MPPT; V voltage is to change along with the variation of power P from just powering on.After process 2min moved a plurality of tracks, when voltage V and power P slowly increased to MPPT voltage Voc and maximum tracking power points Pmp, after this point was stablized 4min, after process 2min moved a plurality of tracks again, voltage V and power P slowly dropped to shutdown again.
In sum, the method of testing of photovoltaic DC-to-AC converter single channel MPPT of the present invention has been simulated the test of solar panel at the various limit points that are subjected to sunshine, also simulation test rise to the process of whereabouts at the sun, effectively tested photovoltaic DC-to-AC converter in each limit and MPPT efficient in typical case.
Above-mentioned embodiment explanation but do not limit the present invention, those skilled in the art can design a plurality of examples that replace within the scope of the claims.The those skilled in the art should be appreciated that there not being violation within the defined scope of the present invention, can make suitable adjustment, modification etc. such as appended claims to specific implementation.Therefore, all according to the spirit and principles in the present invention, any modifications and variations of doing are all within the defined scope of the present invention of appended claims.
Claims (7)
1. the method for testing of a photovoltaic DC-to-AC converter single channel MPPT is characterized in that, comprises the step of static test,
In the step of static test, the power input of input voltage and the photovoltaic DC-to-AC converter of photovoltaic DC-to-AC converter is set with solar simulator, the MPPT efficient of test photovoltaic DC-to-AC converter under input voltage and the various combinations of power input, in described combination, the input voltage of photovoltaic DC-to-AC converter comprises the minimum operating voltage Vmin of the MPPT of photovoltaic DC-to-AC converter, rated operational voltage Vnom, maximum operating voltage Vmax, and the power of photovoltaic DC-to-AC converter comprises the fully loaded power input Pin of photovoltaic DC-to-AC converter and 5% fully loaded power input Pin.
2. the method for testing of photovoltaic DC-to-AC converter single channel MPPT as claimed in claim 1, it is characterized in that, in the step of described static test, the power input that further with solar simulator photovoltaic DC-to-AC converter is set changes successively from 5% full-load power, 25% full-load power, 50% full-load power, 75% full-load power, 100% full-load power, the MPPT efficient of test when input voltage is rated operational voltage Vnom.
3. the method for testing of photovoltaic DC-to-AC converter single channel MPPT as claimed in claim 1, it is characterized in that, in the step of described static test, the power input that further with solar simulator photovoltaic DC-to-AC converter is set changes successively from 100% full-load power, 75% full-load power, 50% full-load power, 25% full-load power, 5% full-load power, the MPPT efficient of test when input voltage is rated operational voltage Vnom.
4. the method for testing of photovoltaic DC-to-AC converter single channel MPPT as claimed in claim 2 or claim 3, it is characterized in that, the power input that further with solar simulator photovoltaic DC-to-AC converter is set is 5% full-load power, the MPPT efficient when the test setting input voltage is minimum operating voltage Vmin.
5. the method for testing of photovoltaic DC-to-AC converter single channel MPPT as claimed in claim 1 is characterized in that, the input voltage of test and power transfer sequentially are: Vmin voltage and 5% Pin power; Vnom voltage and 5% Pin power; Vmax voltage and 5% Pin power; Vmax voltage and 100% Pin power; Vnom voltage and 100% Pin power; Vmin voltage and 100% Pin power.
6. the method for testing of photovoltaic DC-to-AC converter single channel MPPT as claimed in claim 1 is characterized in that, the input voltage of test and power transfer sequentially are: Vmin voltage and 5% Pin power; Vmin voltage and 100% Pin power; Vnom voltage and 100% Pin power; Vmax voltage and 100% Pin power; Vmax voltage and 5% Pin power; Vnom voltage and 5% Pin power.
7. the method for testing of photovoltaic DC-to-AC converter single channel MPPT as claimed in claim 1 is characterized in that, further comprises the step of dynamic test, and the step of described dynamic test comprises:
With solar simulator the maximum voltage Voc that follows the tracks of power points of solar inverter, the maximum power P mp that follows the tracks of power points are set respectively;
Solar inverter is set powers on from start, rise to maximum and follow the tracks of power points Pmp required time, and arrive the maximum tracking stable time of power points Pmp, and drop to the time required when shutting down;
Adopt above-mentioned setting, when inverter works, automatically record the MPPT efficient of each point;
According to test result analysis with judge whether to satisfy specification requirement.
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| CN109088598A (en) * | 2018-06-29 | 2018-12-25 | 汉能移动能源控股集团有限公司 | Method, device and equipment for testing maximum power point tracking efficiency of mobile energy |
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