A novel approach of Active Voltage Control for DFIG-based Wind Farm power system by Coordinating Active & Reactive Powers under Wind Speed Variations

Electrical Engineering

Long-distance transmissions are commonly used to connect large-scale wind farms, however power networks cannot handle the access point voltage of these wind farms. Under wind speed fluctuations, the access point voltage has a difficulty with stability. The reactive power compensation device, on the other hand, is unable to meet both the response speed and the compensation capacity criteria. The reactive power capabilities of doubly fed induction generators are limited by active power output, notwithstanding their quick power decoupling control. Coordinating the reactive power capability and active power output of the wind farm is the important solution for satisfying the reactive power demand of the system under wind speed variations, and it is based on this that a novel active control notion is given. The wind farm's reactive power capability and the system's reactive power demand are both investigated, as well as the controllable circumstances of access point voltage. Active voltage control solutions are proposed, including active reactive power reference modification, active speed control, and active pitch angle intervention based on wind speed ranges. The method is verified in the simulation to appropriately account for reactive power demand and excavate the wind farm reactive power capability. The approach also efficiently reduces the change in grid voltage caused by variations in wind speed.

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