A method for measuring and compensating a power quality device
A power quality and post-compensation technology, applied in the field of measurement and compensation for power quality devices, can solve problems such as deviation, affect the accuracy of measurement results, and magnify accuracy errors, so as to eliminate the deviation of measurement results, improve measurement accuracy, and achieve phase synchronization. Effect
Active Publication Date: 2021-07-30
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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Problems solved by technology
In particular, the current power grid structure is showing a trend of diversification and complexity. The injection of various harmonics and the impact of nonlinear loads make the accurate measurement of electric energy encounter more and more difficulties, because when the power quality device measures, A very small phase deviation will cause a huge deviation, and sometimes the accuracy error is amplified to an unacceptable level, seriously affecting the accuracy of the measurement results
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[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.
[0055] see figure 1 , is a schematic flowchart of a method for measuring and compensating a power quality device provided by an embodiment of the present invention, and the method includes steps S1 to S8:
[0056] S1. Obtain the fundamental wave and harmonic of the power quality device after harmonic analysis, and obtain the fundamental voltage amplitude, fundamental voltage amplitude, fundamental voltage phase and fundamental current phase of the fundamental wave,...
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The invention discloses a method for measuring and compensating a power quality device. The method comprises the steps of: obtaining the fundamental wave and harmonics of the power quality device after harmonic analysis; obtaining the theoretical conversion coefficient of voltage and the theoretical conversion coefficient of current; obtaining the automatic Calibrate the voltage amplitude compensation coefficient, automatically calibrate the current amplitude compensation coefficient, automatically calibrate the voltage phase compensation coefficient and automatically calibrate the current phase compensation coefficient; obtain the voltage interval amplitude compensation coefficient and the current interval amplitude compensation coefficient; obtain the voltage frequency phase compensation coefficient and current frequency phase compensation coefficient; obtain the voltage temperature amplitude compensation coefficient and current temperature amplitude compensation coefficient; calculate the amplitude and phase of the compensated fundamental wave voltage, the amplitude and phase of the compensated fundamental wave current, and the compensated harmonic The amplitude and phase of the voltage, the amplitude and phase of the compensated harmonic current. The invention can realize the phase synchronization of the power quality device and effectively improve the measurement accuracy of the power quality device.
Description
technical field [0001] The invention relates to the technical field of power measurement, in particular to a method for measuring and compensating a power quality device. Background technique [0002] At present, with the rapid development of the power grid, not only the demand for electricity has increased greatly, but also users have higher and higher requirements for power quality. In particular, the current power grid structure is showing a trend of diversification and complexity. The injection of various harmonics and the impact of nonlinear loads make the accurate measurement of electric energy encounter more and more difficulties, because when the power quality device measures, A very small phase deviation will cause a huge deviation, and sometimes the accuracy error is amplified to an unacceptable level, seriously affecting the accuracy of the measurement results. Contents of the invention [0003] The purpose of the embodiment of the present invention is to provi...
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IPC IPC(8): G01R23/16G01R25/00G01R19/04G01R35/00
CPCG01R19/04G01R23/16G01R25/00G01R35/005
Inventor 刘桓瑞丁泽俊
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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