基于μPMU的改进虚拟同步发电机控制策略

An Improved VSG Control Strategy Based onμPMU

针对常规的虚拟同步发电机(VSG)在孤岛模式下会因为负载突变产生频率偏差的问题,提出了一种基于微型同步相量测量单元(μPMU)的改进VSG控制方法,通过μPMU测量VSG及公共母线(PCC)的相角,直接调节VSG与PCC间的相角差以控制有功功率,使频率保持在额定值,简化了VSG控制环节,使系统在负载突变时的响应速度更快,并以μPMU秒脉冲为同步参考信号,计算生成统一参考坐标系的实时旋转相角,基于此相角对各VSG进行同步控制。最后,通过搭建Matlab/Simulink仿真模型验证了所提方法的有效性。

Conventional virtual synchronous generator(VSG)in islanding mode will produce frequency deviation due to load sudden change.This paper proposes an improved VSG control strategy based on micro phase measurement unit(μPMU).The control strategy adjusts the phase angle difference between VSG and point of common coupling(PCC)to control the active power and keeps the frequency at the rated value through measuring the phase angle of VSG and PCC byμPMU.To improve the response speed of the system when the load suddenly changes,the VSG control link is simplified.TakingμPMU pulse per second as synchronous reference signal,the real-time rotation phase angle of unified reference coordinate system is generated.Based on this phase angle,each VSG is controlled synchronously.Finally,the effectiveness of the proposed method is verified by building a Matlab/Simulink simulation model.