基于混合储能的微电网平滑切换控制策略研究

Research on Smooth Witching Control Strategy of Microgrid Based on Hybrid Energy Storage

储能在维持微电网电压和频率的稳定中发挥重要作用,针对微电网在并网与孤岛两种运行方式之间的切换,提出一种基于混合储能装置的微电网平滑控制策略,该控制策略中光伏电源作为主控电源,采用功率环、滤波电容电压环和滤波电感电流环的三环控制策略,有效地减少了微电网过渡过程产生的冲击;混合储能装置作为从控电源,采用恒功率控制策略。在Matlab/Simulink软件建立了光伏电源与蓄电池-超级电容器混合储能的仿真模型,仿真结果表明在该控制策略下,微电网在并网与孤岛模式下运行稳定,能够实现平滑切换。

Energy storage plays an important role in maintaining the voltage and frequency stability of the microgrid.A microgrid smoothing control strategy based on hybrid energy storage device is proposed for the switching of microgrid between grid-connected and islanded operation modes.In the control strategy,the photovoltaic power supply is used as the main control power supply,and the three-loop control strategy of the power loop,the filter capacitor voltage loop and the filter inductor current loop is adopted,which effectively reduces the impact generated by the microgrid transition process;the hybrid energy storage device acts as a slave control,the power supply uses a constant power control strategy.In the software,a simulation model of photovoltaic power supply and battery-supercapacitor hybrid energy storage is established.The simulation results show that under the control strategy,the microgrid runs stably in the grid-connected and island mode,and can achieve smooth switching.