CN103063943A - System and method of detecting electric performance of photovoltaic inverter - Google Patents

System and method of detecting electric performance of photovoltaic inverter Download PDF

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Publication number
CN103063943A
CN103063943A CN2012105177545A CN201210517754A CN103063943A CN 103063943 A CN103063943 A CN 103063943A CN 2012105177545 A CN2012105177545 A CN 2012105177545A CN 201210517754 A CN201210517754 A CN 201210517754A CN 103063943 A CN103063943 A CN 103063943A
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China
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power
photovoltaic
converter
test
electrical property
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CN2012105177545A
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CN103063943B (en
Inventor
李涛永
杜金平
薛金会
闫华光
王鹤
范滢
蒋利民
苗常海
陈雷博
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd
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State Grid Corp of China SGCC
China Electric Power Research Institute Co Ltd
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Abstract

The invention provides a system and a method of detecting an electric performance of a photovoltaic inverter. The system comprises a photovoltaic inverter, a power analyzer and an upper computer. The power analyzer collects the electric parameters of the photovoltaic inverter, and transmits collected item parameters to the upper computer. The system and the method of detecting the electric performance of the photovoltaic inverter achieve the efficiency test and the harmonic test of the photovoltaic inverter, the system is simple in structure, the method is simple and easy to achieve and convenient to use, the accuracy of an electric power data test can be guaranteed, and on the other hand, complex data processing work in a test process is simplified, and the test efficiency of the photovoltaic inverter is improved.

Description

A kind of photovoltaic DC-to-AC converter system for detecting electrical property and method
Technical field
The invention belongs to efficiency test and appraisal technical field, be specifically related to a kind of photovoltaic DC-to-AC converter system for detecting electrical property and method.
Background technology
Solar energy power generating is little because of its volume, and the life-span is long, and the characteristics of zero delivery are just at rapid growth.Present stage, photovoltaic generation mainly comprises 400V low-voltage customer side grid-connected system and accesses the large-sized photovoltaic power station of medium-sized photovoltaic plant and the access 66kV of 10kV and 35kV through step-up transformer.On July 21st, 2009; the Ministry of Finance, the Department of Science and Technology, National Energy Board unite and have issued " about implementing the notice of golden sun demonstration project "; determine comprehensively to take financial aid, science and technology to support and market pulling mode, accelerate industrialization and the large-scale development of domestic photovoltaic generation.In March, 2009, National Ministry of Finance is for carrying out and implementing " Renewable Energy Law ", implement State Council's energy-saving and emission-reduction strategic plan, accelerate the solar energy power technology in the application in urban and rural buildings field, formulated " solar photoelectric Application in Building financial aid capital management tentative method ".Under the energetically promotion of national policy, distributed photovoltaic power has had swift and violent development.According to statistics, by the end of the year 2011, the photovoltaic that is incorporated into the power networks is installed 214.30 ten thousand kilowatts, accounts for 4.15% of distributed power source total volume.
Development along with photovoltaic industry, photovoltaic DC-to-AC converter is had higher requirement, inversion unit is the key equipment in the whole DC power generation system, its effect is that the low-voltage DC that cell panel and accumulator provide is reverse into alternating current, the supply AC load is used, and its reliability directly has influence on the stability of whole DC power generation system operation.The output waveform of inverter should have less degree of distortion, to avoid grid-connected photovoltaic system the public electric wire net volume is polluted.For improving the utilization factor of the energy, should provide as possible the conversion efficiency of inverter.
At present, the testing precision of the electric performance test of inverter (conversion efficiency and harmonic wave) is very high, but when the inverter electric performance test, exists data volume large, and power data relies on the problem of hand-kept, processing.Therefore cause the efficiency test work efficiency lower, consuming time longer.
Summary of the invention
In order to overcome above-mentioned the deficiencies in the prior art, the invention provides a kind of photovoltaic DC-to-AC converter system for detecting electrical property and method, finish efficiency test, the harmonic wave test of photovoltaic DC-to-AC converter, this system architecture is simple, method is simple, easy to use, can guarantee the accuracy of electric power data test, simplify data processing work loaded down with trivial details in the test process on the other hand, improved the testing efficiency of photovoltaic DC-to-AC converter.
In order to realize the foregoing invention purpose, the present invention takes following technical scheme:
A kind of photovoltaic DC-to-AC converter system for detecting electrical property is provided, and described system comprises photovoltaic DC-to-AC converter, power analyzer and host computer; Described power analyzer gathers described photovoltaic DC-to-AC converter electrical quantity, and the item argument that gathers is transferred to host computer.
Described electrical quantity comprises electric weight, electric power, voltage and current.
Realize between described power analyzer and the host computer that LAN connects, the data that described host computer received power analyser sends are carried out statistical computation by the Excel worksheet to data, and then the generated data form, and preserve and print.
Described system detects photovoltaic DC-to-AC converter in input efficiency, output efficiency and the power factor of 5%, 10%, 15%, 20%, 25%, 30%, 50%, 75% and 100% power points of rated power, obtains integration efficient in the cumulative time by the Excel worksheet.
The model of described power analyzer is 3390, and its cumulative time of pointing out image data at above-mentioned power is adjustable, and it is by the clock control of described power analyzer.
The invention provides a kind of photovoltaic DC-to-AC converter electrical property detection method, said method comprising the steps of:
Step 1: timing acquiring photovoltaic DC-to-AC converter electrical quantity;
Step 2: IP address and port numbers that power analyzer and host computer are set;
Step 3: regulate the output power of described photovoltaic DC-to-AC converter, make it reach 5% of rated power, carry out the efficiency test of 5% power points;
Step 4: survey the efficient of 10%, 15%, 20%, 25%, 30%, 50%, 75% and 100% power points according to the described method of step 3, comprise maximum power point P MaxTest;
Step 5: generate and the derived data form according to Excel.
Compared with prior art, beneficial effect of the present invention is:
1. the present invention finishes efficiency test, the harmonic wave test of photovoltaic DC-to-AC converter, this system architecture is simple, method is simple, easy to use, can guarantee the accuracy of electric power data test, simplify data processing work loaded down with trivial details in the test process on the other hand, improve the testing efficiency of photovoltaic DC-to-AC converter.
2.Excle self have good man-machine interface and concrete data-handling capacity, and have outstanding Display and Print control function, easy to use; Can change the input and output object according to on-the-spot needs, measure inverter and exchange or the DC side parameter.
3. slave computer of the present invention is power analyzer, and its physical quantity accuracy is guaranteed by the power instrument analysis.
4. solved in the past in inverter electrical property measuring process amount of test data large, data processing work is loaded down with trivial details, the problems such as accuracy of measurement is low, and electric weight accumulation duration is adjustable in the efficiency test process, and electric weight accumulation duration is reliable by the control of power analyzer machine clock, accurate timing.
Description of drawings
Fig. 1 is photovoltaic DC-to-AC converter system for detecting electrical property structural representation in the embodiment of the invention;
Fig. 2 is photovoltaic DC-to-AC converter electrical property detection method process flow diagram in the embodiment of the invention.
Embodiment
Below in conjunction with accompanying drawing the present invention is described in further detail.
Such as Fig. 1, a kind of photovoltaic DC-to-AC converter system for detecting electrical property is provided, described system comprises photovoltaic DC-to-AC converter, power analyzer and host computer; Described power analyzer gathers described photovoltaic DC-to-AC converter electrical quantity, and the item argument that gathers is transferred to host computer.
Described electrical quantity comprises electric weight, electric power, voltage and current.
Realize between described power analyzer and the host computer that LAN connects, the data that described host computer sends by the VBA technology received power analyser in the Excel worksheet, by the Excel worksheet data are carried out statistical computation, and then the generated data form, and preserve and print.
Described system detects photovoltaic DC-to-AC converter in input efficiency, output efficiency and the power factor of 5%, 10%, 15%, 20%, 25%, 30%, 50%, 75% and 100% power points of rated power, obtains integration efficient in the cumulative time by the Excel worksheet.
The model of described power analyzer is 3390, and its cumulative time of pointing out image data at above-mentioned power is adjustable, and it is by the clock control of described power analyzer.
Such as Fig. 2, the invention provides a kind of photovoltaic DC-to-AC converter electrical property detection method, said method comprising the steps of:
Step 1: timing acquiring photovoltaic DC-to-AC converter electrical quantity; The voltage and current signal access power analyser of photovoltaic DC-to-AC converter, the electric weight accumulation duration that power analyzer is set is 10 minutes, realizes the timing acquiring of data.
Step 2: IP address and port numbers that power analyzer and host computer are set;
Step 3: regulate the output power of described photovoltaic DC-to-AC converter, make it reach 5% of rated power, carry out the efficiency test of 5% power points;
Step 4: survey the efficient of 10%, 15%, 20%, 25%, 30%, 50%, 75% and 100% power points according to the described method of step 3, comprise maximum power point P MaxTest;
Step 5: generate and the derived data form according to Excel.
Photovoltaic DC-to-AC converter should not cause grid voltage waveform excessively distortion and the excessive harmonic current of injection electrical network when operation, to guarantee that other equipment that are connected to electrical network are not caused adverse effect.So when the photovoltaic DC-to-AC converter run with load, current harmonics resultant distortion rate limit value is 5%, and the containing ratio of individual harmonic current has a concrete limit value.In test, detect successively inverter whether up to standard at the relative harmonic content at 100%, 70%, 50%, 30% POL place.
Harmonic wave test link of the present invention, communicate by letter with power analyzer by the VBA technology among the Excel, total harmonic distortion degree, each time containing ratio, each time effective values such as A, B, C three-phase voltage, electric current in the difference readout power analyser 3390, then the data processing tools by Excel compares the data of collection and the relative harmonic content of requirement, draws test result.Mark each test data with color and whether surpass limit value, if surpass limit value then with red mark, eye-catching directly perceived.
Should be noted that at last: above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, although with reference to above-described embodiment the present invention is had been described in detail, those of ordinary skill in the field are to be understood that: still can make amendment or be equal to replacement the specific embodiment of the present invention, and do not break away from any modification of spirit and scope of the invention or be equal to replacement, it all should be encompassed in the middle of the claim scope of the present invention.

Claims (6)

1. photovoltaic DC-to-AC converter system for detecting electrical property, it is characterized in that: described system comprises photovoltaic DC-to-AC converter, power analyzer and host computer; Described power analyzer gathers described photovoltaic DC-to-AC converter electrical quantity, and the item argument that gathers is transferred to host computer.
2. photovoltaic DC-to-AC converter system for detecting electrical property according to claim 1, it is characterized in that: described electrical quantity comprises electric weight, electric power, voltage and current.
3. photovoltaic DC-to-AC converter system for detecting electrical property according to claim 1, it is characterized in that: realize between described power analyzer and the host computer that LAN connects, the data that described host computer received power analyser sends, by the Excel worksheet data are carried out statistical computation, and then the generated data form, and preserve and print.
4. photovoltaic DC-to-AC converter system for detecting electrical property according to claim 1, it is characterized in that: described system detects photovoltaic DC-to-AC converter in input efficiency, output efficiency and the power factor of 5%, 10%, 15%, 20%, 25%, 30%, 50%, 75% and 100% power points of rated power, obtains integration efficient in the cumulative time by the Excel worksheet.
5. photovoltaic DC-to-AC converter system for detecting electrical property according to claim 1, it is characterized in that: the model of described power analyzer is 3390, and its cumulative time of pointing out image data at above-mentioned power is adjustable, and it is by the clock control of described power analyzer.
6. photovoltaic DC-to-AC converter electrical property detection method is characterized in that: said method comprising the steps of:
Step 1: timing acquiring photovoltaic DC-to-AC converter electrical quantity;
Step 2: IP address and port numbers that power analyzer and host computer are set;
Step 3: regulate the output power of described photovoltaic DC-to-AC converter, make it reach 5% of rated power, carry out the efficiency test of 5% power points;
Step 4: survey the efficient of 10%, 15%, 20%, 25%, 30%, 50%, 75% and 100% power points according to the described method of step 3, comprise maximum power point P MaxTest;
Step 5: generate and the derived data form according to Excel.
CN201210517754.5A 2012-12-05 2012-12-05 Method of detecting electric performance of photovoltaic inverter Active CN103063943B (en)

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CN109541359A (en) * 2018-12-27 2019-03-29 许昌开普检测研究院股份有限公司 A kind of converter automatic test system and its application method

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