Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system

A technology of power supply system and detection method, which is applied in the detection field, can solve the problems of cumbersome reactive and harmonic current detection methods, and achieve the effect of clear concept, simple structure and less calculation

Inactive Publication Date: 2010-11-24
UNIV OF SHANGHAI FOR SCI & TECH
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Problems solved by technology

[0003] The present invention aims at the cumbersome detection method of reactive power and harmonic current in the current power supply system, and proposes a positive and negative reactive power and harmonic current detection method in the power supply system, based on the positive sequence of the three-phase voltage space vector orientation Synchronous coordinate rotation or negative sequence synchronous coordinate rotation transformation and low-pass filtering to detect reactive power and harmonic current

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  • Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system
  • Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system
  • Method for detecting positive sequence, negative sequence, idle and harmonic currents of power supply system

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Embodiment Construction

[0021] Such as figure 1 The schematic diagram of the method step algorithm is shown, including the three-phase current test module 2, the zero-sequence current calculation module 1, the phase-locked loop circuit 4, the three-phase static coordinate to the two-phase static coordinate transformation 5, and the voltage-oriented two-phase static coordinate to the two-phase Positive-sequence or negative-sequence synchronous rotating coordinate transformation 6, two low-pass filters 7, 8, voltage-oriented two-phase positive-sequence synchronous rotating coordinate transformation to two-phase stationary coordinate transformation 9, transformation from two-phase stationary coordinates to three-phase stationary coordinates 10 and two subtractors 3,11.

[0022] 1. Setting of positive and negative sequence space rotating current vector and dq positive sequence rotating coordinate system:

[0023] Both the three-phase four-wire and three-phase three-wire asymmetric nonlinear load circuit...

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Abstract

The invention relates to a method for detecting positive sequence, negative sequence, idle and harmonic currents of a power supply system. The detection method is based on three-phase voltage space vector oriented positive sequence synchronous coordinate rotation transformation, negative sequence synchronous coordinate rotation transformation and low-pass filtering. The method is very effective for detecting various positive sequence, negative sequence, idle and harmonic currents of three-phase four-wire and three-phase three-wire non-linear circuits. The method only transforms the tested current, and does not need to transform voltage. Therefore, the invention has the advantages of simple structure and clear conception. The invention is the simplest engineering method for dynamic and static idle and harmonic compensation.

Description

technical field [0001] The invention relates to a detection technology, in particular to a detection method for positive sequence, negative sequence, reactive power and harmonic current in a power supply system. Background technique [0002] At present, most power supply systems are three-phase four-wire systems or three-phase three-wire systems, and their loads contain a large number of nonlinear and inductive loads, such as various three-phase and single-phase power electronic devices. These cause the asymmetry of the power supply system to increase and the harmonic current to intensify, which will cause greater pollution to the power grid and cause a decrease in system efficiency. Therefore, it is very important to perform dynamic reactive power and harmonic compensation to the power grid. The key technology is the detection of reactive power and harmonic current of the system. At present, the most successful method for engineering application is the method based on the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/06G01R23/16G01R29/18
Inventor 杨文焕杨迪瑞
Owner UNIV OF SHANGHAI FOR SCI & TECH
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