采用广域测量信息反馈的广域PSS参数设计  

Parameter Design for Wide-area PSS Using Global Signals

作　　者：李春艳[1,2] 孙元章[1] 彭晓涛[1] 陈向宜[2] 

机构地区：[1]武汉大学电气工程学院,湖北省武汉市430072 [2]四川电力试验研究院,四川省成都市610072

出　　处：《电力系统自动化》2009年第18期6-11,共6页Automation of Electric Power Systems

基　　金：国家科技部"十一五"支撑计划资助项目(2008BAA13B04);湖北省自然科学基金资助项目(2008CDB307)~~

摘　　要：根据互联电网区间振荡的特点,可将参与振荡的机群按各自的"部分惯性中心"等值为两机系统。文中首先推导了等值两机系统的电磁转矩系数,为区间振荡模式的电磁转矩分析奠定了理论依据。在此基础上提出了双通道反馈结构的广域电力系统稳定器(PSS),并采用建立在同步转矩及阻尼转矩概念上的扩展相位补偿法,进一步推导了反映广域反馈信号与本地反馈信号之间关系的传递函数,然后进行相量坐标映射变换,最后系统研究了广域PSS的参数设计。仿真结果表明:它能有效抑制系统的区间低频振荡,提高系统的小信号稳定极限,与其他稳定器设计方法相比,能够进一步改善系统阻尼特性。Based on the inter-area oscillation characteristics in interconnected power system, the machines participating in oscillation can be equivalent to a two-machine system according to their respective inertia center. The electromagnetic torque coefficient for the equivalent two-machine system is firstly deduced, which lays foundations for the electromagnetic torque analysis of inter-area oscillation mode. On this basis a wide-area power system stabilizer （PSS） with two-channel feedback structure is presented, and the extended phase compensation method is adopted to coordinate mapping and conversion by a transfer function between wide-area and local feedback state variables. At last the design method of the parameters for the wide-area PSS is provided systematically. Simulation results show that it can not only damp inter-area modes effectively, but also improve small signal stability limit. Compared with other stabilizer design methods, the approach proposed is helpful to improve the damping characteristics of the system.

关 键 词：广域测量系统 区间低频振荡 电磁转矩 状态量映射矩阵 扩展相位补偿法 广域电力 系统稳定器 

分 类 号：TM712[电气工程—电力系统及自动化] TM761