Flexible DC power distribution network fault range finding method employing fault transient process

Abstract

The invention discloses a flexible DC power distribution network fault range finding method employing a fault transient process, and belongs to the technical field of power distribution network system fault range finding methods. The invention aims at solving problems that various types of commonly used fault range finding methods based on parameter recognition in a high-voltage DC power transmission system and a fault range finding method in a conventional AC power distribution network are limited to a certain degree because the voltage level of a DC power distribution network is lower and the DC power distribution network is liable to be affected by the noise. The method takes a double-end flexible DC power distribution network based on VSC as the research basis, and comprises the steps: extracting transient discharge voltage data of a VSC DC side capacitor through analyzing the transient process of a DC side fault, listing capacitor discharge time domain differential equations comprising a fault position parameter and a transition resistor parameter, carrying out the solving of simultaneous equations, and quickly and accurately achieving the fault range finding of the double-end flexible DC power distribution network. The method is shorter in sampling data window; is high in positioning precision; and is low in sampling frequency.

Description

Technical field [0001] The invention specifically relates to a flexible direct current distribution network fault location method using a fault transient process, and belongs to the technical field of fault location methods for power transmission and distribution systems. Background technique [0002] With the increasing of distributed power sources and DC loads, the development trend of source-grid-load integration continues to accelerate, and traditional power systems are gradually becoming electronic. With the rapid development of voltage sourced converters (VSC), DC power distribution technology has attracted widespread attention at home and abroad and has been put into partial scale applications in recent years. The DC distribution network has the advantages of large power supply capacity, low line loss, high power quality, flexible control, and easy acceptance of distributed power sources. However, when the DC line in the DC distribution network fails, from the perspective...

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Problems solved by technology

[0005] Therefore, aiming at the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problem that the various types of fault location methods based on parameter identification commonly used in HVDC transmission systems also have certain limitations due to the low voltage level of the DC distribution network and are susceptible to noise interference. the limitations of the problem

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