关键词: 虚拟同步发电机, 麻雀算法, 扰动, 功率振荡

Abstract: In order to further optimize the problems existing in virtual synchronous generator when given active power disturbance or power grid frequency mutation disturbance, an improved sparrow algorithm VSG control strategy based on good-point set and t-distribution was proposed. The strategy used the good-point set to initialize the sparrow population, introduced the normal distribution to modify the discoverer position update formula, and added the adaptive t-distribution variation strategy after the sparrow individual position update. The test function was used to verify that the ISSA algorithm had good optimization ability. ISSA algorithm was introduced into VSG control unit to optimize VSG system parameters and obtain a set of optimal solutions that met the requirements. Simulink was used to simulate and compare the conventional VSG control strategy, VSG under SSA optimization and VSG under ISSA optimization, verifying that when disturbance occured in the system, the control strategy had a good suppression effect on frequency and active power oscillation, and compared with the other two control strategies, It had better performance in response speed, overshoot and stability.

Key words: virtual synchronous generator( VSG), sparrow algorithm, disturbance, power oscillation