基于自适应旋转惯量VSG控制策略光储微网系统

针对光伏储能并网发电系统采用常规虚拟同步机VSG(virtual synchronous generator)控制策略在负荷扰动时系统的稳定性和动态性能欠佳的问题,本文提出一种基于自适应旋转惯量VSG控制策略的光伏储能并网发电系统。在常规VSG控制策略的基础上,利用同步发电机的功角特性曲线及转子角速度振荡周期曲线,分析了自适应旋转惯量对系统频率的影响,并对自适应旋转惯量VSG控制策略的稳定性分析及关键参数整定设计。最后,将自适应旋转惯量VSG控制策略应用于光伏储能并网发电系统中并建立其仿真模型。仿真结果表明:在负荷扰动情况下,采用自适应旋转惯量的VSG控制策略的光伏储能发电系统的稳定性和动态性能较好。相比常规的VSG控制策略频率波动及输出功率的波动性明显得到抑制。

Photovoltaic Energy Storage Microgrid System Based on Adaptive Rotating Inertia VSG Control Strategy

Under the conventional virtual synchronous generator(VSG)control strategy,in view of the poor stability and dynamic performance of a grid-connected photovoltaic(PV)energy-storage power generation system under load dis?turbance,a grid-connected PV energy-storage power generation system based on the adaptive rotating inertia VSG con?trol strategy is proposed in this paper.Based on the conventional VSG control strategy,the influences of adaptive rotat?ing inertia on system frequency are analyzed by using the power angle characteristic curve of the synchronous generator and the periodic curve of rotor angular velocity oscillation.In addition,the stability analysis and key parameters of the adaptive rotating inertia VSG control strategy are designed.Finally,the adaptive rotating inertia VSG control strategy is applied to the grid-connected PV energy-storage power generation system,and its simulation model is built.Simulation results show that the stability and dynamic performance of the PV energy-storage power generation system under the adaptive rotating inertia VSG control strategy are better under load disturbance.Compared with the conventional VSG control strategy,the fluctuations of frequency and output power are significantly suppressed.