Research on power-to-heat collaborative storage strategy of photovoltaic and energy-storage microgrid based on multi-energy storage

To improve the economy and operation reliability of the photovoltaic and energy-storage microgrid, a power-to-heat collaborative storage strategy based on a multi-energy storage system is proposed. Firstly, the operation model of the multi-energy storage system is established, and the power required by the multi-energy storage system is decomposed by the variational mode decomposition. Then, the decomposed components are reconstructed according to the response characteristics of each energy storage device, and the output plan and capacity configuration of each energy storage device are determined by using the power-to-heat collaborative storage strategy. Finally, according to the operation state of each energy storage device, the fuzzy control algorithm is introduced to correct the distribution power command of the energy storage devices in real time. The results show that the strategy proposed in this paper reduces the annual cost of the energy storage system by about 14.98%, saves about 660 500 yuan, and improves the long-term fluctuation suppression ability of the system and the coordination ability of the power-to-heat collaborative storage.