Inverter efficiency test method

A technology for efficiency testing and inverters, which is applied in the direction of converting irreversible DC power input to AC power output, instruments, and measuring electricity, and can solve problems such as unstable values ​​and inability to reflect inverters scientifically and comprehensively. Achieve accurate and reliable efficiency values

Pending Publication Date: 2020-12-01
大唐可再生能源试验研究院有限公司
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Problems solved by technology

The current photovoltaic power station efficiency test includes maximum power point tracking efficiency and conversion efficiency. These efficiencies cannot scientifically and comprehensively reflect the actual working efficiency of the inverter under different light sources. Therefore, accurate testing of the inverter (total) efficiency is crucial. important
[0003] The existing inverter efficiency test standards only define the test methods in the harsh test environment of the laboratory. However, the output power of the inverter in the actual work of the photovoltaic power station will change with the light intensity, ambient temperature and other conditions. rather than a stable value

Method used

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Embodiment Construction

[0029] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] This embodiment provides a method for testing inverter efficiency, including:

[0031] Select a typical day with fine weather to test the input / output data of the photovoltaic inverter throughout the day.

[0032] 1. Inverter shut down and power off:

[0033] Before the inverter under test is connected to the grid, disconnect the electrical connection of the input DC and output AC of the inverter under test, discharge the input DC busbar, and use a multimeter to check whether the measurement of the inverter input DC and output AC is a safety failure. power state.

[0034] 2. Wiring of power tester:

[0035] ginseng figure 1 As shown, first, each DC current clam...

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Abstract

The invention relates to an inverter efficiency testing method. The method comprises: shutting down and powering off an inverter; wiring a power tester; the inverter supplying power for operation; starting up the tester and setting; testing and recording; shutting down the inverter again to be powered off; the tester being disconnected, and restoring the inverter; exporting test data; analyzing and calculating test data. According to the invention, the total efficiency of the inverter in actual operation of the photovoltaic power station can be tested. The inverter efficiency is calculated according to an efficiency weighting formula and an inverter test data interval selection mode, and the efficiency value is accurate and reliable. The method can effectively evaluate the performance of the inverter in actual operation, and has great application value for the design and model selection of the inverter of the photovoltaic power station.

Description

technical field [0001] The invention relates to the technical field of inverter efficiency testing, in particular to an inverter efficiency testing method. Background technique [0002] Against the background of global warming and the depletion of fossil energy, the development and utilization of renewable energy is developing rapidly. As the core equipment of the photovoltaic power station, the efficiency index of the inverter always affects the power generation of the photovoltaic power station. The current photovoltaic power station efficiency test includes maximum power point tracking efficiency and conversion efficiency. These efficiencies cannot scientifically and comprehensively reflect the actual working efficiency of the inverter under different light sources. Therefore, accurate testing of the inverter (total) efficiency is crucial. important. [0003] The existing inverter efficiency test standards only define the test methods in the harsh test environment of th...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02M7/42G01R31/00G01R21/00
CPCH02J3/381H02M7/42G01R31/00G01R21/00H02J2300/24H02J2300/26Y02E10/56
Inventor 高德兰李森王娟曹善桥郭鹏王丽杰李致尧张建新
Owner 大唐可再生能源试验研究院有限公司
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