SVC Supplementary Controller Based on Wide Area Signals to Enhance Damping of Inter-Area Oscillation
Chang Yong Xu Zheng (Zhejiang University Hangzhou 310027 China)
SVC is used in power system for the purpose of reactive power support and voltage control. Wide area measurement system (WAMS) has been widely used in modern power systems. This paper describes a systematic approach to design a SVC supplementary controller for improving the damping of power system oscillation (PSDC) based on wide area signals. Firstly the principle of SVC oscillation damping is described. Secondly the concept of synthetical residue index is given and is used to choose the proper input wide area signal. Then the test signal method and residue root locus are adopted to design controller parameters. The third part of the paper proves the effectiveness of the method by eigenvalue analysis and time domain simulation. Then in the last part of the paper the SVC supplementary control is applied to a real grid. And the control effect is shown by time domain simulation in a simple example and a real grid.