马成松,赵耀.基于双机并联虚拟同步机系统的自适应控制策略研究[J].电测与仪表,2022,59(4):191-200. Ma Chengsong,zhaoyao.Research on self-adaptive control strategy based on two-machine parallel virtual synchronous machine system[J].Electrical Measurement & Instrumentation,2022,59(4):191-200.
基于双机并联虚拟同步机系统的自适应控制策略研究
Research on self-adaptive control strategy based on two-machine parallel virtual synchronous machine system
In recent years, in order to make distributed power generation systems present similar characteristics to synchronous generators, virtual synchronous generator (VSG) control technology based on the theory of electromechanical transient analysis of synchronous generators has attracted widespread attention from scholars around the world. However, the multi-parallel VSG group has power oscillations and frequency fluctuations during the transition process of grid connection and fault stabilization, which has a negative impact on the dynamic response and stability of the power system. This paper introduces the VSG control strategy, establishes a small signal model of two VSGs in parallel, analyzes the change of system variables during oscillation, and proposes a two-machine parallel VSG control strategy based on self-adaptive feedforward control(SAFC). Adaptively increase the feedforward amount to compensate the power shortage of the system, improve the response speed and power distribution accuracy of the system, suppress the system frequency fluctuations and active power oscillations, and ensure the fast stability and safety of the system. Finally, a simulation model was established on the Matlab/Simulink platform, and the simulation results proved the feasibility and effectiveness of the proposed control strategy.
