统一潮流控制器附加阻尼抑制次同步谐振的理论与仿真

摘要

With the widespread application of series compensated capacitors , the power systems are facing the severe problem of subsynchronous resonance ( SSR) in China . To solve the SSR problem , a method of supplementary damping control for unified power flow controller ( UPFC) is proposed based on the UPFC with current control mode . The positions of supplementary subsynchronous damping signal accessing to UPFC controller are chosen at first . The UPFC supplementary subsynchronous damping controller ( SSDC) is designed , and the principle how to damp SSR is deduced as well . Besides , the mode‐splitting control is used in the designed SSDC to mitigate the multi‐modal SSR . Finally , the complex torque coefficient and time domain simulation are both performed to analyze and verify the effectiveness of damping SSR with the designed SSDC . Meanwhile , the simulation results also suggest that the designed SSDCs have none negative effect on the performance of UPFC and the system .%随着串联电容补偿输电的推广应用，中国电力系统面临着严峻的次同步谐振（SSR）问题。针对 SSR 问题，文中基于采用电流控制模式的统一潮流控制器（UPFC），提出了一种 UPFC 附加阻尼控制抑制 SSR 的方法；首先选择了附加阻尼控制信号接入 UPFC 控制器的位置，然后设计了UPFC 附加次同步阻尼控制器（SSDC），并推导了其抑制系统 SSR 的机理，且所设计的 SSDC 采用了模态分离控制以达到抑制多模态 SSR 的目的。最后，综合利用复转矩系数和时域仿真的方法，对所设计的 UPFC 装置 SSDC 抑制 SSR 的有效性进行了分析和仿真。结果表明，所设计的 SSDC在有效抑制 SSR 的同时，不会影响系统和 UPFC 装置的正常运行。