考虑直流电抗器的电容型限流器特性及优化配置  

Characteristics and Optimal Configuration of Capacitive Current Limiter Considering DC Reactor

作　　者：李国庆[1] 边竞[1] 王鹤[1] 孙云鹤 王振浩[1] LI Guoqing;BIAN Jing;WANG He;SUN Yunhe;WANG Zhenhao(School of Electrical Engineering,Northeast Electric Power University,Jilin 132012,China;Guodian Jilin Jiangnan Thermal Power Co.,Ltd.,Jilin 132000,China)

机构地区：[1]东北电力大学电气工程学院,吉林省吉林市132012 [2]国电吉林江南热电有限公司,吉林省吉林市132000

出　　处：《电力系统自动化》2020年第5期23-29,共7页Automation of Electric Power Systems

基　　金：国家重点研发计划资助项目(2018YFB0904600)。

摘　　要：直流电网故障电流抑制已成为相关领域必须面对且亟待解决的重要问题之一。现有的故障抑制方法大多采用单一元件,为充分抑制故障电流的上升速率与峰值,文中提出了综合直流电抗器和电容型限流器特性的故障抑制及优化配置方法。首先,基于模块化多电平换流器的故障等值电路,从抑制原理和动作时序2个角度分析了安装故障限流器的必要性;其次,计算分析了电感和电容对故障电流的抑制特性,并将等值电路和求解方法推广到直流环网中,以故障电流和直流电抗器为目标构建了优化配置模型;最后,将优化结果应用于PSCAD/EMTDC仿真模型中,与仅使用直流电抗器相比,该配置结果可进一步减小40%的故障电流且并未延长故障切除时间,表明综合使用直流电抗器与电容型限流器能够大幅度减小故障电流,降低直流断路器的开断容量。Fault current limitation in DC power grid has become one of the important problems that must be faced and urgently solved in related fields.Most of the existing fault limitation methods adopt single component.In order to fully limit the rising rate and peak value of fault current,this paper proposes a fault limitation and optimal configuration method combining the characteristics of DC reactor and capacitive current limiter.Firstly,based on the fault equivalent circuit of modular multilevel converter,the necessity of installing fault current limiter is analyzed from two aspects of limitation principle and action sequence.Secondly,the limitation characteristics of inductance and capacitance to fault current are calculated and analyzed,and the equivalent circuit and solution method are extended to DC ring grid.The optimal configuration model is constructed with the objective of fault current and DC reactor.Finally,the optimization results are applied to PSCAD/EMTDC simulation model.Compared with the scheme using DC reactor only,the configuration results can further reduce 40%of the fault current without prolonging the fault clearance time.It is verified that the combination of DC reactor and capacitive current limiter can significantly reduce the fault current and the breaking capacity of DC circuit breaker.

关 键 词：直流电网 故障抑制 直流电抗器 电容型限流器 优化配置 

分 类 号：TM471[电气工程—电器]