A Study on Electric Power Smoothing System for Lead-acid Battery of Stand-alone Natural Energy Power System Using EDLC

In Stand-alone Natural Energy Power System (SNEPS), the earlier deterioration of lead-acid battery caused by over recycle times has become the main problems that need to be resolved urgently. Fluctuating power of short period of power supply is one of the main reason of recharge cycle times increasing. Hence, to smooth the fluctuating power, improve power quality and prolong the service life of lead-acid battery, we proposed an electric power smoothing compensation system for lead-acid battery using Electric Double Layer Capacitor (EDLC) in this paper. In addition, to avoid the voltage of EDLC increasing or decreasing extremely that caused by the change of transient DC current, We proposed a voltage control method for EDLC and to ensure EDLC works between the upper limit or lower limit.