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研究了多机系统中使用统一潮流控制器(UPFC)抑制电力系统多模态振荡的可行性。首先推导了作为UPFC概念延伸的多端统一潮流控制器(MUPFC)的非线性动态模型和线性化的Phillips-Heffron模型。利用UPFC和MUPFC具有多个控制回路的特点,提出在其多个控制回路上附加多个阻尼控制器来阻尼多模态振荡。通过模态分析,采用可控性指标对系统中的各个弱阻尼模态选取有效的控制回路,并设计了附加阻尼控制器。仿真结果表明,通过该方法确定的在一个UPFC或MUPFC上设置的多个附加阻尼控制器能够成功实现对电力系统多模态振荡的抑制。
The feasibility of suppressing the multi-mode oscillation of the power system by using a uniform power flow controller (UPFC) in multi-machine systems is studied. First of all, the nonlinear dynamic model and linearized Phillips-Heffron model of multi-terminal unified power flow controller (MUPFC) as a concept extension of UPFC are derived. Utilizing the characteristics of UPFC and MUPFC with multiple control loops, it is proposed to add multiple damping controllers to multiple control loops to damp the multi-mode oscillation. Through the modal analysis, using the controllability index to select the effective control loop for each weakly damped mode in the system, an additional damping controller is designed. The simulation results show that the additional damping controller set on a UPFC or MUPFC determined by this method can successfully suppress the multi-mode oscillation of the power system.