Coordination control of energy management for stand-alone wind/PV hybrid systems

Both energy flow and operation characteristics of stand-alone wind/PV hybrid power systems are analyzed to achieve its optimal and reliable operation in this paper. The transition of its various operation modes and working states is also established. A coordination control method that contains maximum power tracking control, load tracking control, charge and discharge control for battery as well as operation with protection is put forward to optimize energy management. Simulation results indicate that the proposed control method is able to switch correctly and automatically between its different operation modes or working states according to the weather condition, load and battery status, and implement the correspondent control strategies. Thus the suggested control method is helpful to optimize stand-alone wind/PV hybrid power system operation.