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Polyphase circuit general harmonic detection method based on instantaneous symmetrical component transformation

A technology of instantaneous symmetry and component transformation, applied in the field of power system, can solve problems such as poor real-time performance, low accuracy, and limited scope of application

Inactive Publication Date: 2015-06-10
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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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  • Polyphase circuit general harmonic detection method based on instantaneous symmetrical component transformation
  • Polyphase circuit general harmonic detection method based on instantaneous symmetrical component transformation
  • Polyphase circuit general harmonic detection method based on instantaneous symmetrical component transformation

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Embodiment Construction

[0047] Combining the principle frame of the multi-phase circuit generalized harmonic current detection method based on instantaneous symmetrical component transformation transformation figure 1 , Algorithm software process box figure 2 and the schematic block of the detection circuit hardware image 3 , describe the specific embodiment and working process of the present invention.

[0048] see figure 1 , figure 2 and image 3 , the whole working process of multi-phase circuit generalized harmonic current detection is: signal conditioning unit 1 and signal conditioning unit 2 receive the phase voltages and phase currents from the multi-phase power system, and filter out the AC components higher than the highest frequency that needs to be detected The signal sampling unit 1 and the signal sampling unit 2 perform analog-to-digital conversion on the adjusted phase voltages and phase currents according to the preset sampling frequency to obtain the digital streams of the phas...

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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...

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Application Information

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IPC IPC(8): G01R19/06
Inventor 刘桂英粟时平粟渊恺覃晔徐志罗钱
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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