基于PWM-CSC的混合直流输电系统的直流故障穿越策略

2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC) Pub Date : 2018-11-01 DOI:10.1109/PEAC.2018.8590282

Bing Xia, Yao-hua Li, Zixin Li, Fei Xu, Fanqiang Gao, Ping-Jian Wang

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引用次数: 4

摘要

提出了一种基于改进脉宽调制电流源变换器(PWM-CSC)的混合高压直流输电系统。该系统在整流侧采用线路整流变换器(LCC)，在逆变侧采用改进型PWM-CSC。系统具有直流故障保护和直流故障快速恢复能力。分析了系统的直流故障特性，提出了直流故障穿越策略。当检测到直流故障时，控制方式由直流电压闭环控制切换为直流电流闭环控制。介绍了直流故障恢复过程。采用该方法可以实现直流故障期间逆变器侧无功功率的可控。最后，利用PSCAD/EMTDC软件搭建了一个400kV/1250 MW的系统。仿真结果验证了所提策略的正确性和有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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DC Fault Ride Through Strategy of a PWM-CSC Based Hybrid HVDC Transmission System

An improved pulse width modulated current source converter (PWM-CSC) based hybrid high voltage direct current (HVDC) transmission system is proposed in this paper. The system adopts a line commutated converter (LCC) at the rectifier side and an improved PWM-CSC at the inverter side. The system has the capability of dc fault protection and rapid dc fault recovery. The dc fault characteristics of the system is analyzed and a dc fault ride through strategy is proposed. The control mode is switched from dc voltage close-loop control to dc current close-loop control when the dc fault is detected. The dc fault recovery process is presented. With the proposed method, the reactive power at the inverter side can be controllable during dc fault period. Finally, a $400kV/1250$ MW system is built using PSCAD/EMTDC software. The simulation results verify the correctness and effectiveness of the proposed strategy.

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2018 IEEE International Power Electronics and Application Conference and Exposition (PEAC)

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