基于区域极点配置的电力系统低频振荡均匀阻尼控制

Uniform Damping Control of Low-Frequency Oscillations in Power Systems Based on Region Poles Assignment

提出了电力系统低频振荡的均匀阻尼控制方法。首先分析了电力系统的阻尼特性和实现均匀阻尼控制的条件;然后利用均匀阻尼思想,以系统振荡模式阻尼均匀为目标,提出利用区域极点配置方法设计发电机附加励磁控制器以实现低频振荡的均匀阻尼控制,由于同时配置多个极点到垂直条状区域中,所以避免了控制器对其他振荡模式阻尼的过度削弱,达到了多机系统的协调控制;最后以IEEE4机11节点和新英格兰10机系统为例,并与精确极点配置法进行比较。仿真结果说明了此控制方法的有效性和鲁棒性,为电力系统低频振荡的抑制提供了新思路。

The uniform damping control of low-frequency oscillation （LFO） is presented in this paper. Firstly, the damping characteristic of power systems and realization condition of uniform damping control are analyzed. Following the idea of making damping uniform, the region poles assignment method is utilized to design multi-machine additional excitation controllers to obtain the uniform damping of all modes. Since this method assigns poles in vertical stripy region at the same time, it could avoid the excessive damping decreasing of other modes caused by controllers, and realize the coordination of multiple controllers. At last, simulations of IEEE 4-machine 11-node and New England 10-machine system using this method are carried out. The simulation results are compared with the simulation of using accurate poles assignment method, which proves the validity and robust of uniform damping control. The uniform damping control could be a new consideration of the restraining of LFO in power systems.