基于自适应调节的微源逆变器虚拟同步发电机控制策略

Control Strategy of Virtual Synchronous Generator Based on Adaptive Adjusting for Distributed Inverters

微电网通过各类功率变换器实现分布式电源分布式开发、就地吸纳和高效应用,但其孤岛运行时惯性很小,频率受负荷波动的影响很大。对于微源逆变器引入虚拟同步发电机控制策略,这对改善微网系统频率稳定性具有重要作用。基于此,提出一种自适应调节的虚拟同步发电机控制策略。首先根据微网实际运行状况实时修正虚拟惯性参数,实现了控制策略的自适应调节,从而保证微网系统的安全稳定运行;然后详细分析所引入转动惯量系数和阻尼系数对微源控制系统的各类影响。Matlab/Simulink仿真结果验证了所提控制策略的正确性和有效性。

Micro-grid enables distributed power realize distributed development, local absorb and efficient application, but its inertia in islanding is small, and the frequency is greatly affected by load fluctuations. The introduction of virtual synchronous generator control strategy to improve micro-grid system frequency stability plays an important role, and the inertia parameters of virtual synchronous generator control strategy is introduced virtually, it can refer to the actual parameters of synchronous generator and can adjust flexibly according to needs. An adaptive adjustment of virtual synchronous generator control strategy is proposed, which can correct virtual inertia parameters according to the actual operating conditions in real-time and ensure the safety and stable operation of micro-grid systems.Both the correctness and validity of the proposed control strategy have been verified by the simulation results in Matlab /Simulink platform.