Inter-harmonic detection system of three-phase active power distribution network

A harmonic detection and distribution network technology, applied in the direction of measuring devices, measuring electrical variables, measuring current/voltage, etc., can solve the problems of cumbersome and complicated calculation process, and achieve the effect of simple system structure and less calculation amount

Active Publication Date: 2013-06-12
SHANGHAI TONGSHENG ENG CONSTR MANAGEMENT
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Problems solved by technology

[0004] The above patented methods still have not been able to solve the cumbersome and complicated calculation process of the online detection method for interharmonic currents currently used in engineering applications

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  • Inter-harmonic detection system of three-phase active power distribution network
  • Inter-harmonic detection system of three-phase active power distribution network
  • Inter-harmonic detection system of three-phase active power distribution network

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Embodiment Construction

[0022] The technical solutions of the present invention will be further explained below in conjunction with the drawings and embodiments, but the following content is not intended to limit the protection scope of the present invention.

[0023] Such as figure 1 As shown, it is a system schematic diagram of an embodiment of the present invention, the system includes a three-phase current test module 1, a three-phase static coordinate to two-phase static coordinate transformation module 2, an inter-harmonic phase-locked loop circuit 3 to be tested, two Phase stationary coordinates to two-phase synchronous to-be-measured inter-harmonic frequency rotating coordinate transformation module 4, low-pass filters 5 and 6, two-phase synchronous inter-harmonic frequency to-be-measured rotational coordinates to two-phase stationary coordinate transformation module 7, two-phase stationary Transformation module 8 from coordinates to three-phase stationary coordinates.

[0024] Such as fig...

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Abstract

The invention discloses an inter-harmonic detection system of a three-phase active power distribution network. The inter-harmonic detection system comprises a three-phase current testing module, a module for transforming three-phase static coordinates to two-phase static coordinates, an inter-harmonic phase-locked loop circuit to be determined, a module for transforming the two-phase static coordinates to two-phase synchronous inter-harmonic frequency rotating coordinates to be determined, a low pass filter, a module for transforming the two-phase synchronous inter-harmonic frequency rotating coordinates to be determined to the two-phase static coordinates, and a module for transforming the two-phase static coordinates to three-phase static coordinates. The inter-harmonic detection system, provided by the invention, is very effective on the inter-harmonic voltage and the inter-harmonic current of a power distribution system. The invention is a system with simple structure, clear conception, and simpler dynamic and static inter-harmonic detection and inter-harmonic cancellation.

Description

technical field [0001] The invention relates to a test and detection technology of a three-phase active distribution network, in particular to an interharmonic detection system of a power distribution system. Background technique [0002] At present, the three-phase active distribution network can also be called an active microgrid, which contains a large number of converters that can feed back electric energy. In addition to generating a large number of harmonic currents, these devices also have a large number of interharmonic currents. The formation of large pollution will not only reduce the efficiency of the system, but also may cause voltage fluctuations and flicker in the power grid. Therefore, it is very important to perform dynamic inter-harmonic compensation and elimination for the three-phase active distribution network, and the key technology is the online detection of the inter-harmonic current of the system. There are mature technologies for online testing and ...

Claims

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Application Information

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IPC IPC(8): G01R23/16G01R19/00
Inventor 吴建国杨文焕李荣高钱侃邵建军王健林徐长贵刘永平张宇陈海需
Owner SHANGHAI TONGSHENG ENG CONSTR MANAGEMENT
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