基于VSG的孤岛微网电压及频率二次调节控制方法

Secondary Regulation Control Method of Voltage and Frequency for Isolated Island Microgrid Based on VSG

独立微电网在运行过程中,传统虚拟同步发电机(virtual synchronous generator, VSG)控制下的最大允许输出功率和系统所带负荷的运行功率之间会存在差异,这会导致系统容量超载。若差异过大还会导致电压及频率越限,威胁系统的安全运行。为减小该问题对系统安全运行的影响,基于VSG控制策略,在分析电压和频率产生偏差的原因基础上,提出一种在独立微电网运行过程中电压及频率能实现二次调节的自恢复控制方法,以使系统的频率及输出功率实现实时动态调节。最后,通过Matlab/Simulink仿真验证了所提控制方法的可行性。

During the operation of an independent microgrid,a discrepancy may arise between the maximum allowable output power controlled by a traditional virtual synchronous generator(VSG)and the power consumed by the system load.This will cause system capacity overload.If the discrepancy is significant,it can lead to voltage and frequency overrunning,posing a threat to the safe operation of the system.In order to mitigate the impact of this issue on the safe operation of the system,a self-recovery control method is proposed based on the VSG control strategy and analysis of voltage and frequency deviation causes.This method aims to achieve secondary regulation of voltage and frequency during independent microgrid operation,and achieve real-time dynamic regulation of system frequency and output power.Finally,the feasibility and effectiveness of the above control method are verified by building a simulation model in Matlab/Simulink software.