一种微网系统孤岛运行条件下的能量管理策略

A Novel Power Management Strategy for Microgrid on Islanding Mode

根据微网系统运行特点,分析了微网系统中分布式发电单元和储能单元孤岛运行条件下的控制策略。为保证分布式电源出力和负荷波动时微网系统中能量供需平衡及其快速动态响应特性,提出了一种分布式发电单元和蓄电池储能单元间的协同控制能量管理策略,选取光伏发电单元的直流母线电压作为储能单元切换开关和充电放电电流参考信号标量。为验证文中所提出算法,分别搭建了包括光伏发电单元和储能单元的仿真模型和实验平台,2台2kVA光伏发电单元采用对等控制作为主分布式单元,蓄电池储能单元采用PQ控制作为从发电单元,仿真和实验结果验证了文中所提算法的有效性和正确性。

The control strategies are investigated and described in this paper when the microgrid operates on islanded mode. In order to balance power requirements and improve the dynamic response when the microsources generators or power demand of local loads change, a novel cooperative control strategy of energy storage system and microsources is proposed. The DC bus voltage of PV systems is considered for identifications of battery energy storage system（BESS） switching function and the charge/discharge current reference. The simulation and test platforms which adopted multi-master structure for improving reliability of the MG are established. Simulation and test results are presented from a microgrid system which consists of two 2kVA parallel connected PV inverters and a battery energy storage system and confirm the feasibility of the proposed approach.