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Method for positioning active load voltage sag source

A technology of voltage sag source and voltage sag, which is applied in the field of power system and can solve the problems of system characteristic influence and load inclusion source not considered

Pending Publication Date: 2020-12-25
DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most current methods adopt a relatively simple load model when locating the source of voltage sags, and do not consider the situation that the load includes the source.
However, when a fault actually occurs, the source of the load will affect the system characteristics, so it is necessary to study it separately

Method used

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  • Method for positioning active load voltage sag source
  • Method for positioning active load voltage sag source
  • Method for positioning active load voltage sag source

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Embodiment Construction

[0023] The preferred embodiments will be described in detail below in conjunction with the description. It should be emphasized that the following description is only exemplary and not intended to limit the scope of the invention and its application.

[0024] The invention provides a voltage sag source location method in which the load includes the source. The simulation model is set: the total length of the transmission line is 200 km, and the distance between the monitoring device M and the load power source is 4 km. Set a three-phase short-circuit fault point in the upstream of the system, the fault is 120km away from the system power supply; the fault time is 0.5-1s; the fault resistance is 1Ω. The specific implementation of this method is as follows:

[0025] 1. Sampling and monitoring data for dynamic identification of system parameters

[0026] Extract the voltage and current waveforms before and during the fault within 0-1s, take 128 points for each half cycle, bring...

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Abstract

The invention discloses a method for positioning an active load voltage sag source. The method comprises the following three steps of identifying upstream and downstream active parameters by using a Thevenin theorem-based multi-point method to obtain a voltage sensitivity equation of the upstream and downstream parameters at a monitoring point, and introducing a weight idea to perform quantitativeanalysis on upstream and downstream positioning of the voltage sag source. According to the method for positioning the active load voltage sag source based on the multi-point method and the sensitivity, the weight idea is introduced to carry out quantitative analysis on the upstream and the downstream of the voltage sag source, and the confidence coefficient of a positioning result is improved.

Description

technical field [0001] The invention belongs to the field of power systems, and in particular relates to a method for locating a voltage sag source. Background technique [0002] With the application of power electronic equipment and the investment of sensitive equipment in the power grid, the issue of power quality has attracted more and more attention. Voltage sag is one of the important power quality problems, and its positioning has the significance of defining the responsibilities of both parties in the accident, reducing economic losses and resolving disputes. However, most current methods adopt a relatively simple load model when locating the source of voltage sags, and do not consider the situation that the load includes the source. However, when a fault actually occurs, the source of the load will affect the system characteristics, so it is necessary to study it separately. The voltage sag source location method with load including source considers the load charac...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 刘朝章赵金勇武巍卢泽光张波陈钰张志强张小虎祝成张兆斌魏本成柴璐
Owner DEZHOU POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER
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