Development of Novel Connection Control Method for Small Scale Solar-Wind Hybrid Power Plant

Solar power systems are rapidly increasing in many countries on the world but the power conditioner system for these applications can only provide power based on what the solar array can immediately generate from the sun. So, the utilization rate of the power conditioner in solar power system is low because of depending on the weather. We can use a hybrid power system including small scale wind turbine and photovoltaic (PV) cell to improve the utilization rate of the power conditioner because the small scale wind power generating system can operate the power conditioner at night and also can use the remaining capacity of power conditioner during daytime. However, the power conditioner of PV cell cannot control optimally the wind turbine due to the output characteristics of wind turbine and PV cell are different. Thus, we researched method that the small scale wind power generating system can connect to the off grid and grid tie power conditioner of solar panel by emulating technical characteristic of PV cell. In previous research [1], we verified that the PV cell emulating system can operate the off grid power conditioner in the stand-alone mode by an actual experiment as well as preliminary method for connecting the emulating system with PV cell. In this paper, we introduce technique solution for grid tie PV cell emulating system in the stand alone mode and propose a novel control design for off grid PV cell emulating system in series connection mode.