计及广域测量系统时滞的互联电力系统鲁棒稳定控制  

Robust Stability Control of Power Systems Based on WAMS With Signal Transmission Delays

作　　者：胡志坚[1] 赵义术[2] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]国家电网技术学院,山东省济南市250002

出　　处：《中国电机工程学报》2010年第19期37-43,共7页Proceedings of the CSEE

基　　金：国家自然科学基金项目(50477018)~~

摘　　要：提出一种利用广域测量系统(wide area measurement system,WAMS)信号来增强互联电力系统区域振荡阻尼的广域自适应监控器(wide area adaptive supervisory controller,WAASC),该控制器计及了广域信号传输时滞的影响。采用帕德(Pade)方法对广域信号传输时滞建模。利用线性分式变换(linear fractional transformation,LFT)方法把时滞看成是系统的参数不确定性,利用具有极点配置约束的混合灵敏度线性矩阵不等式(linear matrix inequality,LMI)方法,设计WAASC。WAASC利用从相量测量单元(phase measurement unit,PMU)获取的全局信号,将阻尼控制信号发送到有关的控制器。采用平衡截断(balanced truncation)技术对原系统和控制器进行降阶。在IEEE4机2区域系统进行的仿真表明,该WAASC能有效地提高互联系统的稳定控制水平。The paper demonstrated the possibility to enhance the damping of inter-area oscillations using wide area measurement system （WAMS） based on a wide area adaptive supervisory controller （WAASC） which considers the wide-area signal transmission delays. Pade approximation approach was used to model the signal transmission delays. The delays were regarded as a parameter uncertainty with linear fractional transformation （LFT） approach. A wide area centralized damping controller based on the mixed-sensitivity linear matrix inequality （LMI） approach with pole-placement restriction was designed. The WAASC used the input information from phase measurement units （PMUs） in power systems and dispatched supplementary control signals to the local controllers. Balanced truncation method was used to reduce the orders of the plant and the controller. The performance of the WAASC was validated by frequency and time domain simulations on an IEEE 4-machine 2-area system. Simulation results prove that the system oscillations with the WAASC in place are always much better damped than without it if the time delays are below 1.0 s. Additionally, the WAASC ensures system stability even in case of cascading faults.

关 键 词：广域自适应监控器 低频振荡 线性分式变换 线性矩阵不等式 相量测量单元 广域测量系统 时滞 

分 类 号：TM76[电气工程—电力系统及自动化]