摘要
电网有功缺额时的频率控制,涉及快速低频减载和相对较慢的调速器动作。同时考虑两者的静态减载算法,初期减载量较小、频率恢复时间较长。文中基于控制效果的先后顺序,将频率调节过程分为2个静态阶段,即不考虑调速器效果的低频减载阶段,以及调速器投入及随后的负荷恢复阶段。计及潮流约束,采用非线性优化算法,求解交流和交直流系统的低频减载及负荷恢复问题。计算结果表明,文中算法减载量稍大,有利于频率的快速恢复;交直流混合系统中电压源变流器的瞬时调节特性,又使减载量比纯交流系统的减载量稍低。第2个阶段,结合调速器调节效果,将该算法应用于负荷恢复量的计算。算例分析验证了所提方法的有效性。
Frequency control under active power shortage relates to the fast response of underfreqeuncy load shedding and the relatively slow response of governor, so both responses should be considered in the static load shedding algorithm simultaneously. In the incipient stage of load shedding the recovery speed of frequency is slow because the load shedding amount is smaller. According to the sequencing of control effects of the two measures, the frequency recovery process is divided into two stages, i.e., the underfrequency load shedding stage without considering the effect of governor and the load recovery stage since governor is put into operation. Taking the constraint of power flow, the underfrequency load shedding and load recovery in AC and AC/DC hybrid power systems are solved by nonlinear optimization algorithm. Calculation results show that the load shedding amount by the proposedalgorithm is a bit larger, however it is favorable to speed up frequency recovery; in AC/DC hybrid system the instantaneous adjusting characteristics of voltage source converter （VSC） is favorable to reduce the load shedding amount. At the second stage, the load recovery is quantified together with the governors＇ performance. Numerical results validate the effectiveness of the proposed algorithm.
出处
《电网技术》
EI
CSCD
北大核心
2011年第7期71-75,共5页
Power System Technology
基金
新世纪优秀人才支持计划项目(NCET-08-0765)
国家自然科学基金项目(50707006)~~
关键词
低频减载
调速器
负荷恢复
最优潮流
多端直
流输电系统
under-frequency load shedding
governor
loadrecovery
optimal power flow
multi-terminal HVDC （MTDC）power transmission system
