Abstract:

A complex storage system is proposed by combining t the lithium iron phosphate batteries and super capacitor by two-way half-bridge converter to stabilize the new energy power generation power fluctuations generated.According to the different demand for energy storage element power fluctuations frequencies,a low-pass filter is used to determine the energy storage element of a given power,and with a double-loop control structure for bidirectional converter control,taking into account the state of charge of the energy storage element of the system impact and optimizing the energy storage system control strategy.Matlab/Simulink simulation shows that the energy storage system improves the stability of the composite and reduces the loss of energy storage battery,verifying the effectiveness of the energy distribution plan and the proposed control strategy.

Key words: Lithium batteries;super capacitor;complex storage systems;low-pass filter;power distribution control