A Concentric Relaxed Notch Domain Analysis Method for Voltage Sags

Abstract

The invention discloses a concentric loosened and sunken field analysis method of voltage sag. The concentric loosened and sunken field analysis method comprises the steps of solving a positive sequence, a negative sequence and a zero sequence node impedance matrix of a grid; determining a fault type and a fault point causing the occurrence of the voltage sag; forming the node resistance array after a fault occurs; solving a voltage sage value of a grid; determining a concentric loosened and sunken field of the fault. The concentric loosened and sunken field analysis method has the advantagesthat through concentric loosened and sunken field analysis with the fault point being the center, the workload of the sunken field analysis can be effectively reduced, the voltage sag influencing range caused by the short circuit fault can be more conveniently judged, a judgment basis is provided for the compensation responsibility problem caused by economic loss due to the voltage sag for a powersupply enterprise and an electricity user, and the method has very high actual application value.

Description

technical field [0001] The invention relates to a concentric relaxation concave domain analysis method of voltage sag. Background technique [0002] With the rapid development of modern industry, a large number of sensitive loads such as microprocessor-based control systems, load equipment containing power electronic devices, computers, and programmable controllers have been put into the power grid. In the case of complaints caused by power quality, the voltage User complaints caused by sags account for more than 80%, and voltage sags have become the most important power quality problem. The voltage sag will cause the factory to stop production and the sensitive load to stop working or even be damaged, resulting in huge economic losses. It is of great theoretical and practical significance to analyze the voltage sag and its sag domain. [0003] At present, the traditional sag domain analysis is essentially to determine the area where the fault point that makes it unable to...

AI Technical Summary

Problems solved by technology

[0004] 1. The number of sensitive loads in the power grid increases, and the traditional concave domain analysis is performed on each sensitive load, which greatly increases the workload of the concave domain analysis

[0005] 2. It is not conducive to distinguishing the respective responsibilities of the power supply and the consumer in the voltage sag accident and the definition of effective compensation

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