Power grid signal identification method of star-connected high-voltage high-power electric energy quality treatment device

Abstract

The invention provides a power grid signal identification method of a star-connected high-voltage high-power electric energy quality treatment device. The power grid signal identification method comprises the following steps: acquiring a power grid voltage signal and a power grid current signal of a device access point and an input current signal of a device body; performing operation analysis ondifferent signal combinations; and finally, judging the phase sequence relationship of the device connected to the three-phase power grid, the corresponding relationship between the power grid voltagePT sampling signal and the power grid primary system, and the corresponding relationship between the power grid current CT sampling signal and the power grid primary system, thus achieving power gridsignal intelligent identification of the star-connected high-voltage high-power electric energy quality control device, simplifying the complexity of equipment installation and wire calibration, andeffectively improving the safety and reliability of equipment operation at the same time.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a power grid signal identification method of a star-connected high-voltage high-power power quality control device. Background technique [0002] With the continuous development of the social economy and the continuous improvement of the level of science and technology, the types and power levels of power loads in the power system are also increasing, especially the wide use of high-power power electronic devices, resulting in a serious low power factor of the power system Power quality problems such as power grid load imbalance, power system harmonic pollution, and even power system voltage imbalance are becoming more and more prominent, seriously endangering the stability of the power system and the safety of user equipment. [0003] In order to solve the power quality problem of the power system, in addition to the traditional compensation devices such as fixed capac...

AI Technical Summary

Problems solved by technology

[0004] The star-connected high-voltage and high-power power quality control device based on power electronic power devices has excellent compensation performance, but its normal operation needs to be accurately connected to the primary system of the grid, and provide accurate grid voltage PT signals and grid current CT signals. When the primary wiring, grid voltage PT sampling signal or grid current CT sampling signal wiring is wrong, the compensation effect of the star-connected high-voltage high-power power quality control device based on power electronic power devices will be significantly reduced, and in serious cases, the control device itself may not be able to operate even damaged

Therefore, strict manual verification of the electrical wiring is required during use. Once an error occurs in the manual calibration line, it may seriously endanger the safety of the equipment.

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