Abstract:
With the growing demand for renewable energy, China has built a multitude of photovoltaic(PV)power stations.However, due to the intermittency and volatility inherent in PV power generation, it is necessary to level its output power.This study begins by establishing models for both a flywheel and a lithium battery.Then, the output power of the PV station is decomposed using the variational mode decomposition(VMD)method to obtain charging and discharging commands for different energy storage units.Considering the response times of diverse energy storage systems, the study determines the capacity configurations for each system.Additionally, incorporating historical operational data from lithium-ion batteries, a longevity model for these batteries is devised to prolong their lifespan.A coordinated control strategy for the hybrid energy storage system is introduced using a particle swarm filtering algorithm.Finally, the efficacy of the proposed control strategy for hybrid energy storage systems is validated through simulation results based on historical operational data from a 15 MW-rated PV station.