Simulation of Power Fluctuation Control in Capacitor Hybrid Energy Storage System Based on PID
Reducing the power fluctuation of hybrid energy storage system can improve the safety and stability of system.In this paper,a method of controlling the power fluctuation of ultracapacitor hybrid energy storage system was presented.At first,a mathematical model for battery SOC was built.And then,the charging and discharging power and SOC state of the energy storage equipment in a hybrid energy storage system were analyzed.Moreover,low-pass filte-ring method was adopted to determine the power reference value of energy storage equipment in the system.Mean-while,a fuzzy neural PID controller was designed.Under the control rules of fuzzy neural PID controller,the power fluctuation control of the hybrid energy storage system was achieved based on the power reference value of ultracapaci-tor and battery.Simulation results prove that the proposed method reduces the power fluctuation of the ultracapacitor hybrid energy storage system,and the control results are more reasonable.
UltracapacitorBatteryPower fluctuation controlHybrid energy storage systemPID controller
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