Analysis and control of post-fault inter-area oscillations by multi-area single machine equivalent method

作者：Chen, Rou-Yi^*; Zhang, Yao; Zhong, Qing; Cai, Guang-Lin

来源：Proceedings of the CSEE, 2009, 29(16): 21-27.

• Damping control
• Domain modes
• Inter-area oscillations
• Relative kinetics
• Single machine equivalent

The paper proposed a multi-area single machine equivalent method to analyze interaction among different power system areas and corresponding control measure to provide good damping torque to post-fault inter-area oscillations. The method divided a multi-machine system into critical areas and non-critical areas according to all the generator power angle swing trajectories and then further reduced them into equivalent one machine infinite bus (OMIB) systems. Relative kinetic energy between different areas and OMIB system kinetic energy was defined and calculated to analyze non-linear inter-area interaction. Fourier frequency spectrum analysis and Prony analysis were used to find dominant modes of power oscillations and their damping ratios. According to the analysis above, the paper proposed a pre-fault control measure of rescheduling power generation among different areas to reduce power system kinetic energy and improve power system damping. The proposed method and control measure were used to analyze and control inter-area oscillations of IEEE five-area-sixteen-machine benchmark system. Test results show that the method can correctly identify post-fault dominant oscillation modes and effectively analyze non-linear interaction among various inter-area modes;the control measure well damps post-fault inter-area low frequency oscillations.

• 出版日期2009-6-5
• 单位华南理工大学