基于电流模型预测的虚拟同步发电机控制策略

Virtual Synchronous Generator Control Strategy Based on Current Model Prediction

提出一种应用于T型三电平并网逆变器的基于电流模型预测的虚拟同步发电机控制策略,构建电流离散预测控制模型,通过进一步优化分区,增加小矢量的选择,在减少控制器计算量的同时,兼顾中点电位平衡的控制效果并改善并网电流质量;根据转子角速度的偏差和角速度变化率来自动调整转动惯量和阻尼系数,缩短暂态调节时间,实现对频率和频率波动的有效抑制。最后通过MATLAB/Simulink平台搭建仿真模型,验证了所提控制策略的可行性和有效性。

This paper proposes a virtual synchronous generator control strategy based on current model prediction applied to T-type three-level grid-connected inverter,constructs a current discrete prediction control model,and considers the control effect of mid-point potential balance and improves the quality of grid-connected current by further optimizing the partitioning and increasing the selection of small vectors,while reducing the controller computation.The rotational inertia and damping coefficient are automatically adjusted according to the deviation of the rotor angular speed and the rate of change of angular speed,which shortens the transient adjustment time and achieves effective suppression of frequency and frequency fluctuation.Finally,a simulation model is built by MATLAB/Simulink platform to verify the feasibility and effectiveness of the proposed control strategy.