Coordinated Optimization of Multi-Machine PSS Based on Improved Gravitational Search Algorithm

Abstract

Optimized damping ratio of power system can effectively suppress the system low frequency oscillation. An improved gravity search algorithm is proposed for coordination and optimization the parameters of the power system stabilizer based on the standard gravity search algorithm. This algorithm introduces the black hole concept and devour operation to increase the search speed and convergence accuracy of the algorithm, balance the global search ability and local exploitation ability of the optimization algorithm, and improve its overall optimization performance. In addition, the eigenvalue and mechanical and electrical oscillating mode characteristics working on various operating conditions of the system are optimized as objective functions to ensure the adaptability and robustness of the coordinated optimization strategy. Finally, the suggested method is executed on the classical WSCC three-generator nine-bus system for confirming its efficacy. The results show that the damping characteristics of the power system have been optimized and power system low frequency oscillation has been effectively suppressed.