CN105785281A - Photovoltaic grid-connected inverter MPPT (maximum power point tracking) efficiency test method and device - Google Patents
Photovoltaic grid-connected inverter MPPT (maximum power point tracking) efficiency test method and device Download PDFInfo
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Abstract
The invention provides a photovoltaic grid-connected inverter MPPT (maximum power point tracking) efficiency test method and device and belongs to the photovoltaic power generation technical field. The method includes the following steps that: the output strategy of the voltage and current of a programmable direct-current power source is determined according to a preset irradiation change strategy; the programmable direct-current power source is controlled to output voltage and current to a photovoltaic grid-connected inverter to be tested according to the output strategy of the voltage and current, and photovoltaic array theoretical maximum output power values at various time sampling points are determined; the input voltage of the photovoltaic grid-connected inverter and the input current of the photovoltaic grid-connected inverter at the time sampling points are monitored; and the maximum power point tracking efficiency of the photovoltaic grid-connected inverter is determined according to the photovoltaic array theoretical maximum output power values at the various time sampling points, the input voltage and the input current of the photovoltaic grid-connected inverter at the time sampling points. With the method and device of the invention adopted, the problems of a long testing process and little possibility of comprehensively realizing static and dynamic maximum power point tracking efficiency testing in the prior art can be solved.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, particularly relate to method of testing and the device of a kind of photovoltaic combining inverter MPPT efficiency.
Background technology
At present, along with global climate problem is day by day serious, energy supply and demand contradiction is constantly aggravated, countries in the world, from sustainable development and the angle ensureing energy resource supply safety, adjust energy policy, include new forms of energy development in national development strategy.Solar energy becomes renewable energy power generation mode because of aboundresources, never exhaustion, clean and safe.Currently, extensive and distributed grid-connected photovoltaic plant is widely used.
In photovoltaic plant, photovoltaic combining inverter is that the DC power conversion sent by solaode becomes the visual plant of feed-in electrical network after alternating current.Photovoltaic combining inverter only a few is run under stable environment, because the radiant illumination of the sun is affected by weather and changes, and the different time sections in a day is also different, so photovoltaic combining inverter MPPT maximum power point tracking (MaximumPowerPointTracking is called for short MPPT) efficiency difficulty is bigger.Photovoltaic combining inverter MPPT maximum power point tracking is that the change to the output voltage produced because of the change of photovoltaic module surface temperature and solar irradiance change with electric current is tracked controlling, solar cell array is made to be always held at the duty of maximum output, to obtain the automatic adjustment behavior of maximum power output.Photovoltaic combining inverter MPPT maximum power point tracking efficiency is within measurement cycle time of regulation, and the direct current energy that tested inverter obtains is operated in the ratio of the electric energy that maximum power point provides with solar battery array simulator in theory within this period.
When currently photovoltaic combining inverter MPPT maximum power point tracking efficiency being tested, the artificial voltage x current inputted to combining inverter that regulates of needs mostly, and artificially regulate the time of the voltage x current simulated, cause whole test process tediously long.And be only currently the test for static MPPT maximum power point tracking efficiency to combining inverter MPPT maximum power point tracking efficiency test, it is difficult to Integrated Static and dynamic maximum power points follow the tracks of efficiency test.
Summary of the invention
The embodiment of the present invention provides method of testing and the device of a kind of photovoltaic combining inverter MPPT efficiency, tediously long to solve test process in prior art, and be only the test for static MPPT maximum power point tracking efficiency to combining inverter MPPT maximum power point tracking efficiency test, it is difficult to the problem that Integrated Static and dynamic maximum power points follow the tracks of efficiency test.
In order to achieve the above object, the present invention adopts the following technical scheme that
A kind of method of testing of photovoltaic combining inverter MPPT efficiency, including:
According to an irradiance change strategy pre-set, it is determined that the output policy of the voltage and current of a programmable DC power supply；
Control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current；
The output policy of the voltage and current according to described programmable DC power supply determines the photovoltaic arrays theoretical maximum output power value of each time sampling point；
Monitor the input voltage of the photovoltaic combining inverter of each time sampling point and the input current of photovoltaic combining inverter；
Photovoltaic arrays theoretical maximum output power value according to described each time sampling point, input voltage and the input current of the photovoltaic combining inverter of described each time sampling point determine described photovoltaic combining inverter MPPT maximum power point tracking efficiency.
Concrete, the described photovoltaic arrays theoretical maximum output power value according to described each time sampling point, input voltage and the input current of the photovoltaic combining inverter of described each time sampling point determine described photovoltaic combining inverter MPPT maximum power point tracking efficiency, including:
Described photovoltaic combining inverter MPPT maximum power point tracking efficiency eta is determined by equation belowMPPT:
Wherein, UDC,iInput voltage for the photovoltaic combining inverter of each time sampling point；IDC,iInput current for the photovoltaic combining inverter of each time sampling point；ΔTiInterval for each time sampling point；Ppvmax,iPhotovoltaic arrays theoretical maximum output power value for each time sampling point.
It addition, described control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current, including:
The output voltage controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls the output electric current of programmable DC power supply in real time.
Additionally, described control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current, including:
The output electric current controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls the output voltage of programmable DC power supply in real time.
Additionally, described control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current, including:
The output controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls output voltage and the output electric current of programmable DC power supply in real time.
Concrete, described irradiance change strategy includes the rate of change of irradiance between test irradiance and the adjacent testing time section that multiple testing time section, each testing time section are corresponding.
Additionally, described test irradiance includes: 1000W/m2、500W/m2、300W/m2、200W/m2And 100W/m2；
The rate of change of described irradiance includes: 100W/m2S and 10W/m2s。
A kind of test device of photovoltaic combining inverter MPPT efficiency, including:
Voltage x current output policy determines unit, for the irradiance change strategy pre-set according to, it is determined that the output policy of the voltage and current of a programmable DC power supply；
Programmable DC power control unit, for controlling described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current；
Theoretical maximum output power value determines unit, and the output policy being used for the voltage and current according to described programmable DC power supply determines the photovoltaic arrays theoretical maximum output power value of each time sampling point；
Monitoring means, the input current of input voltage and photovoltaic combining inverter for monitoring the photovoltaic combining inverter of each time sampling point；
MPPT maximum power point tracking efficiency determination unit, for the photovoltaic arrays theoretical maximum output power value according to described each time sampling point, input voltage and the input current of the photovoltaic combining inverter of described each time sampling point determine described photovoltaic combining inverter MPPT maximum power point tracking efficiency.
Additionally described MPPT maximum power point tracking efficiency determination unit, specifically for:
Described photovoltaic combining inverter MPPT maximum power point tracking efficiency eta is determined by equation belowMPPT:
Wherein, UDC,iInput voltage for the photovoltaic combining inverter of each time sampling point；IDC,iInput current for the photovoltaic combining inverter of each time sampling point；ΔTiInterval for each time sampling point；Ppvmax,iPhotovoltaic arrays theoretical maximum output power value for each time sampling point.
It addition, described programmable DC power control unit, specifically for:
The output voltage controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls the output electric current of programmable DC power supply in real time.
Or, described programmable DC power control unit, specifically for:
The output electric current controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls the output voltage of programmable DC power supply in real time.
Or, described programmable DC power control unit, specifically for:
The output controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls output voltage and the output electric current of programmable DC power supply in real time.
Additionally, described irradiance change strategy includes the rate of change of irradiance between test irradiance and the adjacent testing time section that multiple testing time section, each testing time section are corresponding.
Concrete, described test irradiance includes: 1000W/m2、500W/m2、300W/m2、200W/m2And 100W/m2；
The rate of change of described irradiance includes: 100W/m2S and 10W/m2s。
The method of testing of the photovoltaic combining inverter MPPT efficiency that the embodiment of the present invention provides and device, can according to an irradiance change strategy pre-set, determine the output policy of the voltage and current of a programmable DC power supply, and control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current；The output policy of the voltage and current according to described programmable DC power supply determines the photovoltaic arrays theoretical maximum output power value of each time sampling point；Monitor the input voltage of the photovoltaic combining inverter of each time sampling point and the input current of photovoltaic combining inverter；Photovoltaic arrays theoretical maximum output power value according to described each time sampling point, input voltage and the input current of the photovoltaic combining inverter of described each time sampling point determine described photovoltaic combining inverter MPPT maximum power point tracking efficiency.So, the present invention is without artificially regulating the test that can complete photovoltaic combining inverter MPPT efficiency, process is comparatively quick, and by simulating the change of different irradiance, carry out the test of photovoltaic combining inverter MPPT efficiency, Integrated Static and dynamic maximum power points can follow the tracks of the test of efficiency, it is to avoid current is only test for static MPPT maximum power point tracking efficiency to combining inverter MPPT maximum power point tracking efficiency test, the coarse problem of test result.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, the accompanying drawing used required in embodiment or description of the prior art will be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The flow chart of the method for testing of the photovoltaic combining inverter MPPT efficiency that Fig. 1 provides for the embodiment of the present invention；
Fig. 2 is the curve synoptic diagram of the irradiance change strategy in the embodiment of the present invention；
Fig. 3 is Integrated Static and the dynamic MPPT efficiency first time test curve of the OELMAIERPAC55kW combining inverter in the embodiment of the present invention；
Fig. 4 is Integrated Static and the dynamic MPPT efficiency second time test curve of the OELMAIERPAC55kW combining inverter in the embodiment of the present invention；
Fig. 5 is Integrated Static and the dynamic MPPT voltage and current first time test curve of the OELMAIERPAC55kW combining inverter in the embodiment of the present invention；
Fig. 6 is Integrated Static and the dynamic MPPT voltage and current second time test curve of the OELMAIERPAC55kW combining inverter in the embodiment of the present invention；
Fig. 7 is Integrated Static and the dynamic MPPT efficiency first time test curve of the EHE-N5KS5kW combining inverter in the embodiment of the present invention；
Fig. 8 is Integrated Static and the dynamic MPPT efficiency second time test curve of the EHE-N5KS5kW combining inverter in the embodiment of the present invention；
Fig. 9 is Integrated Static and the dynamic MPPT voltage and current first time test curve of the EHE-N5KS5kW combining inverter in the embodiment of the present invention；
Figure 10 is Integrated Static and the dynamic MPPT voltage and current second time test curve of the EHE-N5KS5kW combining inverter in the embodiment of the present invention；
Figure 11 is the structural representation of the test system of the photovoltaic combining inverter MPPT efficiency in the embodiment of the present invention；
The structural representation of the test device of the photovoltaic combining inverter MPPT efficiency that Figure 12 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.Based on the embodiment in the present invention, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of protection of the invention.
As it is shown in figure 1, the method for testing of a kind of photovoltaic combining inverter MPPT efficiency of embodiment of the present invention offer, including:
Step 101, the irradiance pre-set according to change strategy, it is determined that the output policy of the voltage and current of a programmable DC power supply.
Step 102, control programmable DC power supply according to the output policy of voltage and current to photovoltaic combining inverter output voltage to be measured and electric current.
Step 103, output policy according to the voltage and current of programmable DC power supply determine the photovoltaic arrays theoretical maximum output power value of each time sampling point.
Step 104, monitor the input voltage of the photovoltaic combining inverter of each time sampling point and the input current of photovoltaic combining inverter.
Step 105, photovoltaic arrays theoretical maximum output power value according to each time sampling point, input voltage and the input current of the photovoltaic combining inverter of each time sampling point determine photovoltaic combining inverter MPPT maximum power point tracking efficiency.
The method of testing of the photovoltaic combining inverter MPPT efficiency that the embodiment of the present invention provides, can according to an irradiance change strategy pre-set, determine the output policy of the voltage and current of a programmable DC power supply, and control programmable DC power supply according to the output policy of voltage and current to photovoltaic combining inverter output voltage to be measured and electric current；The output policy of the voltage and current according to programmable DC power supply determines the photovoltaic arrays theoretical maximum output power value of each time sampling point；Monitor the input voltage of the photovoltaic combining inverter of each time sampling point and the input current of photovoltaic combining inverter；Photovoltaic arrays theoretical maximum output power value according to each time sampling point, input voltage and the input current of the photovoltaic combining inverter of each time sampling point determine photovoltaic combining inverter MPPT maximum power point tracking efficiency.So, the present invention is without artificially regulating the test that can complete photovoltaic combining inverter MPPT efficiency, process is comparatively quick, and by simulating the change of different irradiance, carry out the test of photovoltaic combining inverter MPPT efficiency, Integrated Static and dynamic maximum power points can follow the tracks of the test of efficiency, it is to avoid current is only test for static MPPT maximum power point tracking efficiency to combining inverter MPPT maximum power point tracking efficiency test, the coarse problem of test result.
The photovoltaic arrays theoretical maximum output power value according to each time sampling point in above-mentioned steps 105, input voltage and the input current of the photovoltaic combining inverter of each time sampling point determine photovoltaic combining inverter MPPT maximum power point tracking efficiency, it is possible to determine photovoltaic combining inverter MPPT maximum power point tracking efficiency eta by equation belowMPPT:
Wherein, UDC,iInput voltage for the photovoltaic combining inverter of each time sampling point；IDC,iInput current for the photovoltaic combining inverter of each time sampling point；ΔTiFor the interval of each time sampling point, it is generally 1 second；Ppvmax,iPhotovoltaic arrays theoretical maximum output power value for each time sampling point.
Above-mentioned steps 102 controls programmable DC power supply according to the output policy of voltage and current to photovoltaic combining inverter output voltage to be measured and electric current, the output voltage that can be control programmable DC power supply is constant, and according to irradiance change strategy, control the output electric current of programmable DC power supply in real time.
Or the output electric current that can be control programmable DC power supply is constant, and according to irradiance change strategy, control the output voltage of programmable DC power supply in real time.
Or the output that can be control programmable DC power supply is constant, and according to irradiance change strategy, control output voltage and the output electric current of programmable DC power supply in real time.
It addition, above-mentioned irradiance change strategy can include the rate of change of irradiance between test irradiance and the adjacent testing time section that multiple testing time section, each testing time section are corresponding.
Such as, above-mentioned test irradiance may include that 1000W/m2、500W/m2、300W/m2、200W/m2And 100W/m2。
The rate of change of above-mentioned irradiance may include that 100W/m2S and 10W/m2s。
Such as, this irradiance change strategy can as shown in Fig. 2 and table 1 below:
Table 1:
Visible, shown in table 1 and Fig. 2, it is 100W/m that this irradiance change strategy opens machine entrance steady-state operation irradiance in 300 seconds for combining inverter2, then with 10W/m2The rate of change of s slowly rises to 1000W/m at 90 seconds internal irradiation degree2, and continuous service 180 seconds ..., so, until the step of above-mentioned 19 sequence numbers being completed, accumulation continues 4282 seconds.Wherein, in step 18, it is possible to the committed step in his-and-hers watches 1 is repeated test, so that the Stability and veracity of follow-up test result is higher.Such as, at 100W/m2Irradiance when continuous service 300s, enter after steady operational status until combining inverter, change irradiance test inverter MPPT tracking performance and ensure that the stability of test, additionally choose 1000W/m2、500W/m2、300W/m2、200W/m2And 100W/m2Deng 5 kinds of typical case's high, medium and low typical case irradiance operating modes, and carry out a retest, and in conjunction with the common MPPT response time of combining inverter, utilize and remotely control and monitoring system, editor arranges the irradiance rate of change of simulation in advance so that programmable DC power supply can to specify irradiance respectively 100W/m2S and 10W/m2Two kinds of rate of change sudden changes of s, it is ensured that the accuracy of data.
The test of following two combining inverters can be carried out by above-mentioned steps 101-105:
First it is the test that German OELMAIERPAC55kW combining inverter is carried out:
MPPT efficiency curve when being this combining inverter respectively such as Fig. 3 to Fig. 6 corresponding to different irradiance, DC input voitage and curent change curve.
According to formula corresponding in above-mentioned steps 105, count the inverter DC input voitage of record, current value and sampling time, and corresponding moment photovoltaic arrays theoretical maximum output power value, on average double MPPT efficiency test is as a result, it is possible to obtain the MPPT efficiency value of OELMAIERPAC5 inverter.
It is additionally the test that carries out of the combining inverter of EHE-N5KS5kW to China:
According to the formula in above-mentioned steps 105, count the inverter DC input voitage of record, current value and sampling time, and the photovoltaic arrays maximum power point performance number that the moment is theoretical accordingly, the MPPT efficiency value that can obtain EHE-N5KS5kW inverter is 96.31% shown in formula below, twice combining inverter is static with dynamic comprehensive MPPT efficiency test result as shown in Figure 7 to 10, repeats twice static static state and dynamic comprehensive MPPT efficiency test result being EHE-N5KS5kW inverter with dynamic comprehensive MPPT efficiency value meansigma methods.
What deserves to be explained is, the method for testing of the photovoltaic combining inverter MPPT efficiency of the embodiment of the present invention can be realized by the test system of a photovoltaic combining inverter MPPT efficiency as shown in figure 11:
The test system of this photovoltaic combining inverter MPPT efficiency includes programmable DC power supply 21, power analyzer 22, switch cubicle 23, oscillograph 24, test platform tele-control system 25.Wherein, test platform tele-control system 25 is connected with programmable DC power supply 21 and switch cubicle 23 communication, programmable DC power supply 21 is connected to photovoltaic combining inverter 26 to be measured, one end, the other end of photovoltaic combining inverter 26 to be measured and power analyzer 22, switch cubicle 23 and oscillograph 24 concatenate.It addition, this switch cubicle 23 also can be connected to the AC analogue electrical network 27 for powering.
Programmable DC power supply 21 in the present embodiment can simulate the irradiance change under various weather condition, such as fine day, rainy day, the weather condition complicated and changeable such as cloudy, with shadow occlusion, cover under the ambient conditions such as dirt, snowberg irradiance change, the function of the I/V output characteristics of solar cell array by the change modeling of irradiance, it is capable of the operational mode of constant voltage, constant current and firm power, and according to the irradiance change strategy pre-set, control and the adjustment of voltage, electric current and power can be performed.Can within the scope of the voltage and current restriction that inverter allows by above-mentioned test platform tele-control system 25, pass a parameter instruction in real time, is adjusted carrying out whole test process to the electric parameter of current output.
The output of photovoltaic combining inverter 26 can be monitored analyzing by this power analyzer 22.This switch cubicle 23 can control the connecting and disconnecting of the circuit of the test system of whole photovoltaic combining inverter MPPT efficiency.This oscillograph 24 can show that electric current that photovoltaic combining inverter 26 exports and voltage parameter are shown.
Corresponding to the embodiment of the method in above-mentioned Fig. 1, the embodiment of the present invention provides the test device of a kind of photovoltaic combining inverter MPPT efficiency, as shown in figure 12, and including:
Voltage x current output policy determines unit 31, it is possible to according to an irradiance change strategy pre-set, it is determined that the output policy of the voltage and current of a programmable DC power supply.
Programmable DC power control unit 32, it is possible to control programmable DC power supply according to the output policy of voltage and current to photovoltaic combining inverter output voltage to be measured and electric current.
Theoretical maximum output power value determines unit 33, it is possible to determine the photovoltaic arrays theoretical maximum output power value of each time sampling point according to the output policy of the voltage and current of programmable DC power supply.
Monitoring means 34, it is possible to monitor the input voltage of the photovoltaic combining inverter of each time sampling point and the input current of photovoltaic combining inverter.
MPPT maximum power point tracking efficiency determination unit 35, can according to the photovoltaic arrays theoretical maximum output power value of each time sampling point, input voltage and the input current of the photovoltaic combining inverter of each time sampling point determine photovoltaic combining inverter MPPT maximum power point tracking efficiency.
Additionally MPPT maximum power point tracking efficiency determination unit 35, specifically can determine photovoltaic combining inverter MPPT maximum power point tracking efficiency eta by equation belowMPPT:
Wherein, UDC,iInput voltage for the photovoltaic combining inverter of each time sampling point；IDC,iInput current for the photovoltaic combining inverter of each time sampling point；ΔTiInterval for each time sampling point；Ppvmax,iPhotovoltaic arrays theoretical maximum output power value for each time sampling point.
It addition, programmable DC power control unit 32, it is possible to the output voltage controlling programmable DC power supply is constant, and according to irradiance change strategy, controls the output electric current of programmable DC power supply in real time.Or the output electric current controlling programmable DC power supply is constant, and according to irradiance change strategy, control the output voltage of programmable DC power supply in real time.Or the output controlling programmable DC power supply is constant, and according to irradiance change strategy, control output voltage and the output electric current of programmable DC power supply in real time.
Additionally, irradiance change strategy includes the rate of change of irradiance between test irradiance and the adjacent testing time section that multiple testing time section, each testing time section are corresponding.
Concrete, test irradiance includes: 1000W/m2、500W/m2、300W/m2、200W/m2And 100W/m2.The rate of change of this irradiance includes: 100W/m2S and 10W/m2s。
What deserves to be explained is, the specific implementation of the test device of the photovoltaic combining inverter MPPT efficiency that the embodiment of the present invention provides may refer to the embodiment of the method shown in above-mentioned Fig. 1, repeats no more herein.
The test device of the photovoltaic combining inverter MPPT efficiency that the embodiment of the present invention provides, can according to an irradiance change strategy pre-set, determine the output policy of the voltage and current of a programmable DC power supply, and control programmable DC power supply according to the output policy of voltage and current to photovoltaic combining inverter output voltage to be measured and electric current；The output policy of the voltage and current according to programmable DC power supply determines the photovoltaic arrays theoretical maximum output power value of each time sampling point；Monitor the input voltage of the photovoltaic combining inverter of each time sampling point and the input current of photovoltaic combining inverter；Photovoltaic arrays theoretical maximum output power value according to each time sampling point, input voltage and the input current of the photovoltaic combining inverter of each time sampling point determine photovoltaic combining inverter MPPT maximum power point tracking efficiency.So, the present invention is without artificially regulating the test that can complete photovoltaic combining inverter MPPT efficiency, process is comparatively quick, and by simulating the change of different irradiance, carry out the test of photovoltaic combining inverter MPPT efficiency, Integrated Static and dynamic maximum power points can follow the tracks of the test of efficiency, it is to avoid current is only test for static MPPT maximum power point tracking efficiency to combining inverter MPPT maximum power point tracking efficiency test, the coarse problem of test result.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program.Therefore, the present invention can adopt the form of complete hardware embodiment, complete software implementation or the embodiment in conjunction with software and hardware aspect.And, the present invention can adopt the form at one or more upper computer programs implemented of computer-usable storage medium (including but not limited to disk memory, CD-ROM, optical memory etc.) wherein including computer usable program code.
The present invention is that flow chart and/or block diagram with reference to method according to embodiments of the present invention, equipment (system) and computer program describe.It should be understood that can by the combination of the flow process in each flow process in computer program instructions flowchart and/or block diagram and/or square frame and flow chart and/or block diagram and/or square frame.These computer program instructions can be provided to produce a machine to the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device so that the instruction performed by the processor of computer or other programmable data processing device is produced for realizing the device of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions may be alternatively stored in and can guide in the computer-readable memory that computer or other programmable data processing device work in a specific way, the instruction making to be stored in this computer-readable memory produces to include the manufacture of command device, and this command device realizes the function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make on computer or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computer or other programmable devices provides for realizing the step of function specified in one flow process of flow chart or multiple flow process and/or one square frame of block diagram or multiple square frame.
Applying specific embodiment in the present invention principles of the invention and embodiment are set forth, the explanation of above example is only intended to help to understand method and the core concept thereof of the present invention；Simultaneously for one of ordinary skill in the art, according to the thought of the present invention, all will change in specific embodiments and applications, in sum, this specification content should not be construed as limitation of the present invention.
Claims (14)
1. the method for testing of a photovoltaic combining inverter MPPT efficiency, it is characterised in that including:
According to an irradiance change strategy pre-set, it is determined that the output policy of the voltage and current of a programmable DC power supply；
Control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current；
The output policy of the voltage and current according to described programmable DC power supply determines the photovoltaic arrays theoretical maximum output power value of each time sampling point；
Monitor the input voltage of the photovoltaic combining inverter of each time sampling point and the input current of photovoltaic combining inverter；
Photovoltaic arrays theoretical maximum output power value according to described each time sampling point, input voltage and the input current of the photovoltaic combining inverter of described each time sampling point determine described photovoltaic combining inverter MPPT maximum power point tracking efficiency.
2. the method for testing of photovoltaic combining inverter MPPT efficiency according to claim 1, it is characterized in that, the described photovoltaic arrays theoretical maximum output power value according to described each time sampling point, input voltage and the input current of the photovoltaic combining inverter of described each time sampling point determine described photovoltaic combining inverter MPPT maximum power point tracking efficiency, including:
Described photovoltaic combining inverter MPPT maximum power point tracking efficiency eta is determined by equation belowMPPT:
Wherein, UDC,iInput voltage for the photovoltaic combining inverter of each time sampling point；IDC,iInput current for the photovoltaic combining inverter of each time sampling point；ΔTiInterval for each time sampling point；Ppvmax,iPhotovoltaic arrays theoretical maximum output power value for each time sampling point.
3. the method for testing of photovoltaic combining inverter MPPT efficiency according to claim 2, it is characterized in that, described control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current, including:
The output voltage controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls the output electric current of programmable DC power supply in real time.
4. the method for testing of photovoltaic combining inverter MPPT efficiency according to claim 2, it is characterized in that, described control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current, including:
The output electric current controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls the output voltage of programmable DC power supply in real time.
5. the method for testing of photovoltaic combining inverter MPPT efficiency according to claim 2, it is characterized in that, described control described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current, including:
The output controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls output voltage and the output electric current of programmable DC power supply in real time.
6. the method for testing of the photovoltaic combining inverter MPPT efficiency according to any one of claim 1-5, it is characterized in that, described irradiance change strategy includes the rate of change of irradiance between test irradiance and the adjacent testing time section that multiple testing time section, each testing time section are corresponding.
7. the method for testing of photovoltaic combining inverter MPPT efficiency according to claim 6, it is characterised in that described test irradiance includes: 1000W/m2、500W/m2、300W/m2、200W/m2And 100W/m2；
The rate of change of described irradiance includes: 100W/m2S and 10W/m2s。
8. the test device of a photovoltaic combining inverter MPPT efficiency, it is characterised in that including:
Voltage x current output policy determines unit, for the irradiance change strategy pre-set according to, it is determined that the output policy of the voltage and current of a programmable DC power supply；
Programmable DC power control unit, for controlling described programmable DC power supply according to the output policy of described voltage and current to photovoltaic combining inverter output voltage to be measured and electric current；
Theoretical maximum output power value determines unit, and the output policy being used for the voltage and current according to described programmable DC power supply determines the photovoltaic arrays theoretical maximum output power value of each time sampling point；
Monitoring means, the input current of input voltage and photovoltaic combining inverter for monitoring the photovoltaic combining inverter of each time sampling point；
MPPT maximum power point tracking efficiency determination unit, for the photovoltaic arrays theoretical maximum output power value according to described each time sampling point, input voltage and the input current of the photovoltaic combining inverter of described each time sampling point determine described photovoltaic combining inverter MPPT maximum power point tracking efficiency.
9. the test device of photovoltaic combining inverter MPPT efficiency according to claim 8, it is characterised in that described MPPT maximum power point tracking efficiency determination unit, specifically for:
Described photovoltaic combining inverter MPPT maximum power point tracking efficiency eta is determined by equation belowMPPT:
Wherein, UDC,iInput voltage for the photovoltaic combining inverter of each time sampling point；IDC,iInput current for the photovoltaic combining inverter of each time sampling point；ΔTiInterval for each time sampling point；Ppvmax,iPhotovoltaic arrays theoretical maximum output power value for each time sampling point.
10. the test device of photovoltaic combining inverter MPPT efficiency according to claim 9, it is characterised in that described programmable DC power control unit, specifically for:
The output voltage controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls the output electric current of programmable DC power supply in real time.
11. the test device of photovoltaic combining inverter MPPT efficiency according to claim 9, it is characterised in that described programmable DC power control unit, specifically for:
The output electric current controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls the output voltage of programmable DC power supply in real time.
12. the test device of photovoltaic combining inverter MPPT efficiency according to claim 9, it is characterised in that described programmable DC power control unit, specifically for:
The output controlling programmable DC power supply is constant, and according to described irradiance change strategy, controls output voltage and the output electric current of programmable DC power supply in real time.
13. the test device of the photovoltaic combining inverter MPPT efficiency described in-12 any one according to Claim 8, it is characterized in that, described irradiance change strategy includes the rate of change of irradiance between test irradiance and the adjacent testing time section that multiple testing time section, each testing time section are corresponding.
14. the test device of photovoltaic combining inverter MPPT efficiency according to claim 13, it is characterised in that described test irradiance includes: 1000W/m2、500W/m2、300W/m2、200W/m2And 100W/m2；
The rate of change of described irradiance includes: 100W/m2S and 10W/m2s。
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| CN116593748A (en) * | 2023-05-23 | 2023-08-15 | 深圳市费思泰克科技有限公司 | High-power programmable direct-current power supply for testing new energy solar inverter |
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