Energy storage in microgrid has ability to load smooth and power quality improvement.Vanadium redox battery has broad application prospects in microgrid because of high-performance characteristics.A dual-loop control control strategy is proposed for vanadium redox battery inverter in islanding mode.The inner-loop control designs a PI controller after transforming the single-phase system into three-phase system,and the outer-loop control which is based on droop curve similar to generator,adopts the V/Pf/Q control strategy according to the characteristics of low-voltage microgrid.The proposed dual-loop control strategy has been tested in MATLAB/Simulink simulations and on a laboratory-scale experimental system.%储能单元在微电网中能起到平定负荷、改善电能质量的作用,其中全钒液流电池以其诸多高性能在微电网有广泛应用前景.提出一种在微电网孤岛模式下全钒液流电池逆变器的双环控制策略.内环控制在对电流进行d、q坐标系分量进行解耦基础上.设计了PI控制器;外环控制基于类似发电机的功率、频率下垂曲线,并根据微电网低压系统的特点,采用电压一有功和频率一无功控制方式.仿真及装置实验的结果证明了双环控制策略的有效性.
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