孤岛模式下光储交流微电网能量管理协调控制策略

Energy management and coordinated control strategy of PV/battery AC microgrid in islanded operation

针对光储交流微电网,考虑光伏阵列、蓄电池和负荷之间的多种能量供需情况,提出了一种孤岛运行模式下的能量管理协调控制策略。该控制策略采用主从控制方式,作为主源的蓄电池可以工作在充电或放电状态,保证为负载和光伏逆变器提供幅值和频率稳定的电压;作为从源的光伏系统可以根据微电网内部能量平衡关系,工作在最大功率跟踪或限功率负载匹配模式;负荷投切控制可以保证重要负荷持续供电以及避免蓄电池过放。通过不同工况下的仿真结果,验证了所提控制策略的正确性与有效性。

Considering the relationship of energy supply and demand among PV, battery and load,a coordinated control strategy for energy management of PV/battery AC microgrid during islanded operation is proposed. The control strategy adopts master-slave control approach, in which the battery working as the main source is able to charge or discharge so as to provide stable voltage amplitude and frequency for both load and PV inverter; while the PV system as the slave source can work either in maximum power point tracking（MPPT） or power limitation mode（PLM）according to the internal power balance; and the load switching control guarantees sustainable power supply for important loads and prevents the battery from over discharge. Simulation results under different working conditions verify the correctness and effectiveness of the proposed control strategy.