考虑时滞影响的统一潮流控制器的控制设计

Control design of unified power flow controller in consideration of time-delay

为了克服广域测量系统(WAMS)中延时所带来的问题,提出了考虑时滞影响的统一潮流控制器(UPFC)的控制设计方法.建立了装有UPFC的单机无穷大(SMIB)电力系统的时滞线性微分方程组,并通过时域仿真简单分析了时滞对UPFC控制性能的负面影响.基于线性矩阵不等式(LMI)理论和Matlab中LMI工具箱,重新设计了UPFC,结合遗传算法优化得到了控制器参数.时域仿真结果表明,考虑时滞影响时设计的控制器能承受较长时间的控制信号延迟,有效改善了电力系统在不同时滞情况下的动态响应,增强了UPFC的时滞不敏感性和电力系统的静态稳定性.

To counteract the negative effect of time-delay introduced by wide area measurement system （WAMS）, a new control design method of unified power flow controller （UPFC） considering time-delay was proposed. The linear time-delay differential equations of single-machine infinite-bus （SMIB） power system with UPFC were established, and the negative effect of time-delay on UPFC＇s performance was verified by a simple time-domain simulation. Based on linear matrix inequality （LMI） theory and Matlab＇s LMI toolbox, the UPFC was redesigned and the controller＇s parameters were optimized by combining with genetic algorithm. Time-domain simulation results show that the proposed UPFC considering time-delay effects can endure long delay of control signal and smooth the dynamic response of power system under different time-delay, and that the new UPFC enhances the UPFC＇s indifference to time-delay and the power system＇s static stability.