基于同步发电机模型的微网逆变器控制仿真研究

摘要

The micro-grid inverter equipped with energy storage device was researched in this pa-per.According to the speed regulation and excitation control theory of synchronous generator, the controller of micro-grid inverter was designed.The micro-grid inverter was turned into a vir-tual synchronous generator(VSG),which had the ability of power control and the function of fre-quency modulation and voltage regulation.In order to fully reflect the electromagnetic transient process of synchronous generator,the power differential compensation and excitation current control units were added to reduce the impacts of current caused by the load mutation or mode switching.The control schemes of the virtual synchronous generator islanding,connecting to the grid and mode switching were also designed.A 10 kV·A virtual synchronous machine simulation model was set up to verify the validity of the control strategy.%以配备储能装置的微网逆变器为研究对象，借鉴同步发电机机组调速及励磁控制原理，设计微网逆变器控制器，将逆变器整定为虚拟同步发电机(VSG)，使其具备功率控制和调压调频的功能。为了能模拟同步发电机的电磁暂态过程，在功率控制环路中添加功率微分补偿环节和励磁电流控制环节，减小负载突变或者模式切换造成的电流冲击。设计 VSG 在离网、并网以及模式切换时的控制方案，搭建1台10 kW 的 VSG 机仿真模型，并验证了控制策略的正确性。