Control and Power Management of Combined Wind-Microturbine Generation System in Stand-Alone Applications

This paper deals with the performance investigation and control of a combined wind-microturbine generation system at off-grid and stand-alone applications. As the novelty, in this paper, the wind turbine does not always work at the MPPT mode, and depending on the available wind power and load demand, two operation modes for the wind turbine are defined: power control mode (MPPT mode) and voltage control mode. At the conditions that the available wind power is less than the load demand, the wind turbine operates at the MPPT mode and microtubule provides the rest of the load power. Once the available wind power goes beyond the load demand, the microturbine can not absorb the additional power, and wind turbine works at load following mode. In this mode, the wind turbine power is less than the available wind power and is identical to the load demand, and the microturbine power is negligible. At the end, by performing simulations at the Matlab-Simulink environment, performance of the study system at different operating conditions is investigated.