摘要
通过将混合两端高压直流输电系统的直流侧简化为串联的LC负载,建立系统数学模型,分析了混合高压直流系统的直流谐振问题,提出了一种阻尼注入抑制谐振的新型控制方法,即在不改变交流侧电流和电压的情况下,通过动态调整MMC投入子模块的总数实现对系统直流回路注入阻尼的目的,从而抑制直流谐振。PSCAD仿真验证了该方法的可行性和性能,所提出的控制方法可以有效地抑制混合高压直流输电系统直流谐振。
This paper analyzes the DC resonance issue of a hybrid double-terminal HVDC system by simplifying the DC side of the MMC into a series-connected LC load and establishing mathematical model of the system.In order to suppress the DC resonance,a new control method is proposed to inject damping into the resonance system.As a result,the DC resonance is eliminated by dynamically adjusting the total number of inserted sub-modules of the MMC,without changing the current and voltage on the AC side.The feasibility and performance of the proposed method are validated by simulations in PSCAD.The control method proposed in this paper can eliminate DC resonance issue of a hybrid HVDC system.
作者
侯婷
王国强
郭龙
邹常跃
翁海清
易荣
HOU Ting;WANG Guoqiang;GUO Long;ZOU Changyue;WENG Haiqing;YI Rong(State Key Laboratory of HVDC,Electric Power Research Institute,CSG,Guangzhou 510663,China;Rongxin Power Electronic Co.,Ltd.,Beijing 100084,China)
出处
《南方电网技术》
CSCD
北大核心
2019年第8期9-14,共6页
Southern Power System Technology
