全桥晶闸管耗能子模块型LCC换流器及其协调控制

为了有效减小电网换相高压直流输电(line-commutatedconverter based high voltage direct current,LCC-HVDC)的换相失败概率,文中提出一种基于全桥晶闸管型耗能子模块的新型LCC换流器拓扑,可有效抑制暂态直流电流的增长,降低换相失败概率。文中给出子模块的不同工作模式,提出子模块与阀臂之间的协调控制策略及子模块参数的设计方法,分析耗能电阻的能耗及散热问题。最后在PSCAD中进行仿真分析,结果表明,所设计的控制参数是合理的,子模块电压电流应力均在合理范围内,电阻的能耗也可以满足要求;而且,所提新型LCC换流器拓扑可以有效抑制换相失败,并改善系统的暂态特性。

LCC Converter Adopting Thyristor Based Energy Dissipation Full-bridge Sub-module and Its Coordination Control

A LCC converter topology based on thyristor full bridge energy dissipation sub module(TED-FBSM)was proposed to mitigate the commutation failure in linecommutated-converter high voltage direct current(LCCHVDC),which can effectively inhibit the growth of transient dc current and reduce the probability of commutation failure.In this paper,different working modes of the sub-module were presented,the control strategy of sub-module under different working conditions was proposed and the design method of sub-module parameters was also presented,the energy consumption and heat dissipation problems of the energy dissipation resistance were analyzed.Finally,the simulation analysis was carried out in PSCAD,and the simulation results show that the designed control parameters are reasonable,the voltage and current stress of the sub moldule are within a reasonable range,and the energy consumption of the resistance can also meet the requirements.Furthermore,the proposed topology can effectively mitigate the commutation failure and improve the transient characteristics of the system.