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Electric system three-phase imbalance disturbance source positioning method

A technology of disturbance source localization and power system, applied in the field of localization, can solve the problem of less research on unbalanced source localization

Active Publication Date: 2015-01-28
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in various power quality problems, there have been many studies on the location of harmonics and voltage sag sources, but there are few studies on the location of unbalanced sources.

Method used

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  • Electric system three-phase imbalance disturbance source positioning method
  • Electric system three-phase imbalance disturbance source positioning method
  • Electric system three-phase imbalance disturbance source positioning method

Examples

Experimental program
Comparison scheme
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Embodiment

[0070] The system schematic diagram of imbalance analysis according to the present invention is as Figure 4 shown. Among them, point P is the public connection point, E SA ,E SB ,E SC is the three-phase value voltage source of the power supply system, Z SubA ,Z SubB ,Z SubC is the equivalent impedance, Z Line is the transmission line, Z Load for distributed load.

[0071] Figure 4 The basic parameters of the system are:

[0072] Power supply system: 10kV, 50Hz, three-phase three-wire

[0073] System Impedance: Z Self =(0.4806+j2.5833)Ω, Z Mutual =(-0.2076+j0.1153)Ω

[0074] Transmission line: length 12km, line impedance matrix (per km) under A, B, C phase sequence is

[0075] Z abc = 0.3959 + j 0.9122 0.0581 + j ...

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Abstract

The invention relates to an electric system three-phase imbalance disturbance source positioning method. The method includes the steps of firstly, establishing an equivalent circuit diagram for positioning a three-phase imbalance disturbance source; secondly, calculating negative-sequence voltages produced by the upstream side and the downstream side at a public connection point; thirdly, calculating imbalance indexes contributed by the negative-sequence voltages on the basis of a vector projection method; fourthly, positioning the imbalance source. By means of the method, the three-phase imbalance disturbance source in an electric system can be effectively positioned according to three-phase voltage and current data obtained at the public connection point through measurement; the position of the three-phase imbalance disturbance source is judged through the phasor projection method based on the negative-sequence voltages produced by the upstream side and the downstream side at the public connection point, and the method is easy to understand and implement.

Description

technical field [0001] The invention relates to a positioning method, in particular to a positioning method for a three-phase unbalanced disturbance source in a power system. Background technique [0002] The national standard GB-T 15543-2008 has made the following regulations on "three-phase voltage unbalance": when the power grid is in normal operation, the negative sequence voltage unbalance degree shall not exceed 2%, and shall not exceed 4% in a short time; The allowable value of negative sequence voltage unbalance at this point caused by each user is generally 1.3%, and not more than 2.6% in a short time. [0003] The voltage imbalance of the power system is generally caused by the imbalance of the power supply link and the imbalance of the power consumption link. The power supply link is the link of power generation, transmission, transformation, and power distribution, in which the three-phase components involved can cause voltage imbalance; the imbalance of the pow...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 王同勋刘颖英渠通孙媛媛李培鑫
Owner STATE GRID CORP OF CHINA
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