摘要
本文提出了一种以权衡时滞稳定裕度和阻尼比为目标对统一潮流控制器阻尼控制设计进行优化的技术。为解决传统设计方法中UPFC辅助阻尼控制器在通信信号传输存在时延时对区间低频振荡抑制能力不足的问题,在经典UPFC阻尼控制模型为初始模型的基础上,综合考虑广域测量系统中通信时延的时变和随机特征建立了UPFC阻尼控制时滞模型,根据Lyapunov-Krasovskii稳定性定理,得到具有极低保守性的电力系统时滞相关稳定条件,揭示了阻尼控制器参数、时滞稳定裕度、阻尼性能指标相互影响的规律,并据此实现对传统阻尼控制器的优化设计。通过仿真发现:使用该方法得到的UPFC阻尼控制器既有较好的区间低频振荡抑制能力,又能容忍一定通信时延,克服了传统阻尼控制器难以适应较长通信时延的不足。
An optimization design of damping control for unified power flow controller on the tradeoff between delay margin and damping ratio is proposed.In order to solve the problem that supplementary damping controller obtained by conventional design can not effectively damping interval frequency oscillation in the case of communication latency,a UPFC damping control time-delay model with considering time varying and stochastic feature of the communication latency,which is based on classical UPFC damping control model,is constructed.A delay-dependent stability criterion for power system with less conservativeness is derived according to the Lyapunov-Krasovskii stability theory,which unveils interactive influence mechanism among damping controller parameters,delay margin and damping performance,and helps to optimize conventional damping controller design.Simulations demonstrates that UPFC damping controller designed by the proposed method can effectively damp interval frequency oscillation as well as endure a certain communication latency,which overcomes the disadvantages of conventional damping controller in the case of longer communication latency.
出处
《电路与系统学报》
北大核心
2013年第2期196-201,共6页
Journal of Circuits and Systems
基金
国家自然科学基金重大国际合作研究项目(61210011)
国家自然科学基金(60974045)