A Reactive Power Substitution Control Strategy for Wind Farm Considering the Reactive Capacity of Wind Turbines

Under steady-state, through the reactive power substitution between reactive power compensation equipment and wind turbines, the output power of centralized reactive power compensation devices can be reduced to satisfy the dynamic reactive power demands such as fault ride-through. In this paper, a reactive power substitution control strategy for wind farm is proposed. This control strategy prioritizes the centralized reactive power compensation devices to respond to the requirements of grid dispatching and voltage regulation. Then, to address different types of grid voltage faults, the control objective is to minimize the output of centralized reactive power compensation equipment and the terminal voltage deviation of the wind turbines. An optimization model is established to obtain the reactive power command of wind turbines online and realize real-time control for wind farms. Finally, an actual wind farm is taken to verify the feasibility of the proposed reactive power replacement control strategy under steady-state and grid voltage faults.