DC Fault Ride Through Strategy of a PWM-CSC Based Hybrid HVDC Transmission System
DC Fault Ride Through Strategy of a PWM-CSC Based Hybrid HVDC Transmission System
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DOI：
10.1109/peac.2018.8590282
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发表时间：
2018-11
期刊：
影响因子：
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通讯作者：
Bing Xia;Yao-hua Li;Zixin Li;Fei Xu;Fanqiang Gao;Ping-Jian Wang
中科院分区：
文献类型：
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作者：
Bing Xia;Yao-hua Li;Zixin Li;Fei Xu;Fanqiang Gao;Ping-Jian Wang
提出了一种基于改进型脉宽调制电流源换流器（PWM-CSC）的混合高压直流输电系统。该系统在整流侧采用线性换流变换器（LCC），在逆变侧采用改进的PWM-CSC。该系统具有直流故障保护和快速恢复的能力。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，控制模式从直流电压闭环控制切换到直流电流闭环控制。给出了直流故障恢复过程。采用该方法，在直流故障期间，逆变器侧的无功功率是可控的。最后，利用PSCAD/EMTDC软件建立了一个400 kV/1250 MW系统。仿真结果验证了所提策略的正确性和有效性。
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.