Fault Location Technique for Multi-Terminal VSC-HVDC System

doi:10.3969/j.issn.1000-7229.2017.08.004

Abstract

Abstract: ABSTRACT： The fault location technique of multi-terminal flexible DC （MTDC） grid is one of the crucial techniques for the safe and reliable operation of DC power grid. This paper takes the MTDC grid based on two-level voltage source converter （VSC） as research object, and adopts the idea of “first predetermined section then position” to study its fault location technique. Under the impact of fault loop and big DC capacitor, the DC capacitor voltage change rate （ du/dt） at converter outlet is different in fault region or non-fault region. Based on this characteristics, we can determine fault region by comparing the du/dt at VSC outlet. After the determination of fault region, we can use the discharge circuit formed by the short-circuit fault to derive the calculation formula of the fault position, and calculate the precise fault position by using recorded data of transient voltage of VSC DC capacitor. We build VSC-HVDC system in MATLAB/Simulink, simulate and verify the proposed method. At the same time, we compare the proposed method with the existing methods to verify the feasibility and effectiveness of the proposed method.

Key words: flexible DC, fault location, transient process, voltage change rate

CLC Number:

TM 72

ZHANG Ming, HE Jinghan, ZHANG Yizhi, LUO Guomin. Fault Location Technique for Multi-Terminal VSC-HVDC System [J]. Electric Power Construction, 2017, 38(8): 24-.

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