1.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;2.Yunnan Electric Power Dispatching and Control Center, Kunming 650011, China

Installing power system stabilizer is an effective means to enhance power system stability with small disturbances. Compared with the traditional single-band power system stabilizer, the multi-band power system stabilizer has more frequency band branches and higher control degrees of freedom, which can better suppress the oscillation mode with lower frequency, but its setting process and method have not been widely studied. A setting method of parameters for multi-band power system stabilizer based on the frequency domain margin index of multi-input-multi-output system is proposed. The method considers several weakly damped oscillation modes in the performance index, adjusts the amplitude-frequency and phase-frequency characteristics of several multi-band power system stabilizers, guarantees the designed stabilizers maximize the system stability margin while providing suitable compensation phase, and ensures the stability of the excitation mode. Case studies of Yunnan power grid of China validate the effectiveness of the proposed method.