可控电流源型换流器换流应力分析

Commutation Stress Analysis of Controllable Current-source Converter

可控关断的电流源型换流器(current source converter,CSC)是解决直流输电换相失败问题的有效方法之一。对其开展电气应力分析是换流器电气、绝缘和试验设计的理论基础,其相关研究仍属空白。该文在分析CSC运行原理和调制方法的基础上,首先研究在主动换相与强迫换相过程中,换流阀及关键部件的应力特性;其次,给出逆阻集成门极换流晶闸管(reverse blocking integrated gate commutated thyristor,RB-IGCT)周期关断的建模方法,提取4500V/3000A器件的建模参数。最后,建立“器件–换流阀–系统”详细仿真模型,对250kV/750MW的直流系统进行仿真分析,提取主动和强迫换流过程中的整机和关键部件的应力特性。结果表明,所提理论分析方法和参数计算能够为CSC的电气设计和等效试验提供技术支撑。

The controllable current source converter(CSC)can is considered to be an effective solution for solving the commutation failure.Stress analysis is the theoretical basis of converter valve electrical parameters and experimental system design,and its related research is still need to be developed.Based on the operation principle and modulation method,the stress characteristics of the whole and key components during the active commutation and forced commutation are analyzed in this paper.The simulation model of reverse blocking integrated gate commutated thyristor(RB-IGCT)for CSC is established,and the accurate parameters of the simulation model is verified according to the experimental results.Finally,the simulation model of the device is applied to the 250kV/3kA simulation system to verify the stress characteristics of the theoretical analysis,which provides a foundation for the electrical design and equivalent experiment of CSC.