摘要
受限于现有的小扰动分析软件无法对高压直流输电系统(HVDC)控制回路建模,直流控制器的分析和设计严重依赖于时域仿真,无法获得对于控制器性能的机理性认识。文中利用NETOMAC仿真软件中NEVA的自定义控制器功能,定义了新的HVDC控制回路模型。利用根轨迹技术,分析了2008年度南方电网3回直流调制采用广域信号反馈控制时各自的不同性能,发现了由于HVDC调制引发的模态谐振现象,这种现象的存在使得直流调制控制的阻尼效果被削弱。最后,提出一种利用多直流协调控制消除模态谐振的方案,并通过NETOMAC的时域仿真加以验证。
Due to the limitation of modeling of HVDC control loops in small signal stability analysis, current works on HVDC modulation controller design strongly depend on time-domain simulation, which cannot give more insight into mechanism of controllers. The paper induces a novel HVDC modulation loop model through customized control function of NEVA. By using the root locus method, different impacts of three-HVDC modulation control of China Southern Power Grid （CSG） with widearea feedback signals on CSG＇ s oscillation modes are analyzed. A strong nonlinear modal interaction phenomenon called ＇ modal resonance＇ is observed, and modal resonance may result in deterioration of damping. Finally, a scheme of coordination of multiple HVDC modulation to mitigate modal resonance is proposed, which is validated by NETOMAC time-domain simulation.
出处
《电力系统自动化》
EI
CSCD
北大核心
2007年第21期90-93,共4页
Automation of Electric Power Systems
基金
中国博士后科学基金资助项目~~
关键词
多馈入交直流互联系统
低频振荡
模态谐振
直流调制控制
广域信号
协调控制
multi-infeed HVDC
low-frequency oscillation
modal resonance
modulation controller
wide-area signal
coordinated control
