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Xie Xiaorong, Xiao Jinyu, Tong Luyuan, Han Yingduo(Tsinghua University, Beijing 100084, China)  
Inter-area low-frequency oscillation often is a serious bottleneck for increasing power transfer across interconnected power system, while existing damping controllers, such as PSS, provide inferior performance in dealing with this problem. The rapid development of wide-area measurement system, or WAMS, paves the way to accurately measure and quickly transfer relative power angles and rotor speeds of generators over the distance of a whole power system, and thus makes it possible to construct global inter-area damping control by using wide-area measurements. This presents a great potential in enhancing power-angle stability and transfer capability. For a simple two-area four-machine power system, this paper studied the designing principle, implementation method and simulation result of an inter-area damping control loop for generators' excitation controllers, thereby demonstrating the effectiveness of WAMS-based inter-area damping control and its possible realization in practical engineering. With regard to developing wide-area damping control for large-scale power systems, some key issues in both theory and practice are put forward for further research.
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