Detection Method of Transient Symmetrical Component Transformation of Generalized Harmonics in Polyphase Circuits

Abstract

The invention belongs to the field of electric power system and relates to a polyphase circuit general harmonic detection method based on instantaneous symmetrical component transformation. The polyphase circuit general harmonic detection method basically includes the general harmonic voltage detection algorithm and the general harmonic current detection algorithm. The general harmonic voltage detection algorithm includes the voltage instantaneous symmetrical component transformation algorithm, the voltage sine algebraic transformation algorithm, the voltage average filtering algorithm, the voltage initial phase algorithm, the voltage reconstruction algorithm and the general harmonic voltage computational algorithm. The general harmonic current detection algorithm includes the current instantaneous symmetrical component transformation algorithm, the current cosine algebraic transformation algorithm, the current average filtering algorithm, the current initial phase algorithm, the voltage-current phase difference algorithm, the current reconstruction algorithm and the general harmonic current computational algorithm. The poly circuit general harmonic detection method is simple in phase locking, strong in real-time effect, high in accuracy, simple in algorithm, easy to implement, economic, wide in application range and the like.

Description

technical field [0001] The invention belongs to the field of power systems, and relates to a detection method for generalized harmonic voltage and current of a multi-phase power system based on the instantaneous symmetrical component transformation theory. Background technique [0002] The ideal working state of AC power system is sinusoidal, symmetrical phase sequence, and unit power factor. In the actual power system, due to the existence of a large number of ineffective components such as nonlinear, non-sinusoidal, non-phase sequence symmetry, and low power factor, with the power loads that are sensitive to power quality such as microelectronics equipment and high-precision manufacturing systems, the larger scale For power systems, dynamic suppression and elimination of ineffective components in power systems has become an inevitable choice, and the demand for real-time and high-precision detection of generalized harmonic voltage and current is becoming more and more urge...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a kind of high-efficiency method for comprehensive detection of generalized harmonic voltage and current instantaneous value of polyphase AC power system suitable for any number of phases, to overcome the deficiencies of existing single-phase and three-phase circuit generalized harmonic voltage and current detection methods, Solve the technical problems of the existing generalized harmonic voltage and current instantaneous value detection methods, such as poor real-time performance, low accuracy, limited application range, unsuccinct detection algorithm, and difficult hardware implementation

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