光-储虚拟同步机多模式运行控制与改善储能系统寿命的选择性投退策略

MULTI-MODE OPERATING CONTROL OF OPTICAL-STORAGE VIRTUAL SYNCHRONIZER AND SELECTIVELY PLUG IN/OUT STRATEGY FOR IMPROVING ENERGY STORAGE SYSTEM LIFETIME

该文研究光储虚拟同步机不同运行模式及其控制方法,提出改善储能寿命的VSG选择性投退策略。结合光储特点和电网需要提出光储系统实施VSG的4种运行模式及其功率协调控制方法。为降低负荷实时扰动带来的VSG成本,提出依据扰动大小选择性投入VSG的策略,通过离线求解模型方程组得到VSG投入时刻,在线根据扰动频率变化进行匹配的方法实现选择性启动VSG,使电网优先利用物理发电机惯量。为避免电网受扰后频率恢复阶段光储VSG二次吞吐电量而影响储能寿命并降低频率恢复速度,提出光储VSG动态退出方案,构建了基于电网频率动态特征的VSG退出判据。仿真结果验证了该文分布式光储VSG控制策略和选择性启停方案的正确性及有效性。

This paper researches on the VSG control and plug in/out strategy of PV&Energy Storage Integrated System(PESIS).Considering the equipped parameters and work status of storage,operating modes is concluded for PESIS,and the control strategy is provided for different modes.In order to reduce the VSG cost caused by real-time load disturbance,a strategy of selective VSG input based on the disturbance size is proposed.The VSG input time is obtained by solving model equations offline,and the selective START of VSG is realized by matching the disturbance frequency variation online,so that the power grid can give priority to the use of the inertia of physical generator.To avoid the secondary VSG charging/discharging as well as the depression of the frequency restoring rate,a plug out strategy when the power system frequency gets restored after disturbance is provided.Criterion of detecting the restoring moment of transient frequency is established.Simulation results show that the control algorithm and the plug in and out scenario are effective.