一种抑制多馈入直流系统后续换相失败的低压限流单元参数优化策略  

A Method for Optimizing the VDCOL Parameter to Suppress the Subsequent Commutation Failure of Multi-infeed HVDC System

作　　者：刘一论 刘进飞 高红均[1] LIU Yilun;LIU Jinfei;GAO Hongjun(College of Elcetrical Engineering,Sichuan University,Chengdu 610065,China;Nanchong Power Supply Company of State Grid Sichuan Electric Power Company,Nanchong 637000,Sichuan Province,China;Ziyang Power Supply Company of State Grid Sichuan Electric Power Company,Ziyang 641300,Sichuan Province,China)

机构地区：[1]四川大学电气工程学院,成都市610065 [2]国网四川省电力公司南充供电公司,四川省南充市637000 [3]国网四川省电力公司资阳供电公司,四川省资阳市641300

出　　处：《电力建设》2021年第5期122-129,共8页Electric Power Construction

摘　　要：多馈入直流输电系统受端换流站电气距离近,直流系统与交流系统之间、直流系统与直流系统之间相互作用也更为复杂。当交流系统较弱时,故障恢复期间提供的无功支撑不足,容易引起多回直流系统发生后续换相失败。配置无功补偿装置,优化控制环节参数等措施均有利于改善直流系统的故障恢复特性。基于此,提出一种抑制多馈入直流系统后续换相失败的低压限流单元参数优化策略,利用静止同步补偿器(static synchronous compensator,STATCOM)输出的无功大小来衡量直流系统恢复程度,并将STATCOM输出的无功功率和直流电压相结合作为输入信号,随故障发展过程自适应调整低压限流单元输入输出特性,降低系统发生后续换相失败的概率。在PSCAD/EMTDC中搭建含STATCOM的双馈入直流输电系统模型,仿真结果验证了所提策略的有效性。Due to the short electrical distance of the inverter stations in multi-infeed HVDC system,the interaction between DC and AC and between DC and DC are more complex.When the AC system is weak,insufficient reactive power support is provided during the fault recovery period,which is easy to cause subsequent commutation failure of multi-infeed HVDC system.Configuration of reactive power compensation devices,optimization of control parameters and other measures are conducive to improve the fault recovery characteristics of HVDC system.This paper proposes a parameter optimization strategy of VDCOL to suppress subsequent commutation failure of multi-infeed HVDC system.The reactive power output of STATCOM is used to measure the recovery degree of HVDC system.Combined with DC voltage as input signal,the input and output characteristics of VDCOL can be adaptively adjusted according to the fault development process,so as to reduce the probability of subsequent commutation failure.A dual-infeed HVDC system model with STATCOM is built in PSCAD/EMTDC,the simulation results verify the effectiveness of the proposed strategy.

关 键 词：多馈入直流系统 后续换相失败 静止同步补偿器(STATCOM) 低压限流(VDCOL) 参数优化 

分 类 号：TM531[电气工程—电器]