Smoothed-Power Output Supply System for Battery of Stand-alone Renewable Power System Using EDLC

A smoothed-power output topology for battery of stand-alone renewable power system (SARPS) using EDLC (electric double layer capacitor) is presented. To prolong the service life of battery, decrease maintenance cost and power loss of SARPS by realizing smoothed-power output supply, an EDLC is paralleled with battery as a part of storage system, and connected by a bi-directional buck/boost compensation topology. The EDLC stores fluctuant component and compensate battery current through proposed topology and switch control. Whereas the changeful natural condition and initial power condition, an appointed fluctuant power condition as an example to analyze the validity of proposed method in simulation and real-time experiment example firstly. The results show that smoothed-power output for battery can be obtained through proposed topology and satisfy the criterion of smooth precision. And then, the experiment result carried out in actual stand-alone wind power system further shows the feasibility of proposed topology