计及控制策略影响的MMC-HVDC直流单极接地故障特性分析

doi:10.16180/j.cnki.issn1007-7820.2021.08.011

Abstract

Abstract:

At present, in order to solve the problem that the converter control is not fully considered in the single-stage ground fault characteristics of the existing flexible HVDC transmission system, this study proposes a transient characteristics analysis method for single-stage ground fault of MMC-HVDC system considering the influence of control strategy. According to the grounding mode of neutral point, the short circuit current path model after the single point grounding fault on DC side is constructed. By analyzing the influence of the nearest level control strategy on the physical parameters in the fault path, the change law of number of sub-modules on the bridge arms that locates on faulted pole is revealed. The formulas of short circuit current and capacitor voltage of sub-modules are derived, which accurately shows the transient characteristic of single point fault on DC side for MMC-HVDC system. The RTDS simulation results show the validity of formulas of short circuit current and capacitor voltage.

Key words: single-stage ground fault, control system, sub-module capacitor voltage, short-circuit current, grounding mode, circulation path, nearest level approximation control, fault characteristic

CLC Number:

TP11

SHI Xi,CHENG Peng. Analysis of MMC-HVDC DC Single Pole Grounding Fault Considering the Influence of Control Scheme[J].Electronic Science and Technology, 2021, 34(8): 64-70.

Figures/Tables 10

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Table 1

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Figure 9.

References 19

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参数	数值
额定交流电压	25 kV
额定直流电压	±20 kV
桥臂子模块个数	10
桥臂电感	0.003 1 H
子模块电容	1 200 μF
输电线路电阻	0.033 Ω·km^-1
输电线路电抗	2.7 mH·km^-1
输电线路长度	200 km

Analysis of MMC-HVDC DC Single Pole Grounding Fault Considering the Influence of Control Scheme

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