Study on Steady State Reactive Power Optimization Method of Synchronous Generator to Improve Transient Voltage Stability

Abstract

In steady state operation, increasing the reactive power output of the generator can improve the transient voltage stability of the system, but at the same time, it will bring the problem of increasing the network loss in steady state operation. Firstly, this paper defines the transient reactive power compensation coefficient to determine the voltage regulated sensitive generating set. Secondly, the voltage transient stability classification model was based on XGBOOST(Xtrem Gradient Boosting) by taking the DC near region key bus voltage, reactive power output of sensitive generator set and fault type as the main input feature quantities. Then, The reactive power output optimization model of the sensitive synchronous generator is established with the constraint condition that the system can maintain voltage transient stability under certain fault types, and the optimization objective is to minimize the network loss of the system. Finally, Particle Swarm Optimization algorithm(PSO)is adopted to solve the optimization model. the simulation verification is carried out on PSASP based on the Jiangxi power grid after azhong-Jiangxi UHVDC operation. The results show that the proposed method can improve the transient voltage stability of the system by optimizing the steady-state reactive power output of the key synchronous generators in the system for different faults, while taking into account the network loss of the system.