Considering the comprehensive optimization research of the hybrid energy storage control strategy based on the photovoltaic-storage-DC microgrid

Abstract

Considering the state of charge of the energy storage and the deviation of the DC bus reference voltage exceeding the limit, a multi-loop power control strategy is constructed in the front-stage structure, and the state of charge of the energy storage or the deviation of the reference voltage of the DC bus is fed back to the upper limit. In the photovoltaic power controller, the photovoltaic controller deviates from the maximum power operating point and adjusts the reference voltage of the photovoltaic output, thereby preventing the energy storage state of charge from exceeding the set upper limit or the DC bus voltage suddenly rising. On the contrary, the state of charge of the energy storage that exceeds the lower limit or the deviation of the DC bus reference voltage is fed back to the demand response side to send a command to cut off the DC load, to prevent the state of charge from exceeding the set lower limit and the DC bus voltage to drop suddenly, thus realizing the front stage of the system.