Integrated Control of Energy Management for Stand-Alone PV System

The operating characteristics of stand-alone PV system are analyzed in order to improve the efficiency of PV arrays and prolong battery life in this paper. The transition diagram of its various working states is also established. An energy management method that integrates maximum power tracking control, load power tracking control, fast charge with variable current and discharge control for battery is presented. Simulation results show that working states are reasonably switched according to the load and weather condition, and the operation status of battery is also improved. Thus the suggested control method is helpful to optimize stand-alone PV system operation.