Pitch Control Scheme for Rapid Active Power Control of a PMSG-Based Wind Power Plant

Abstract

This paper proposes a pitch control scheme for rapid active power control of a permanent magnet synchronous generator (PMSG)-based wind power plant (WPP). To minimize the pitch-angle fluctuation, the target pitch-angle is determined by using an analytical calculation, not a conventional proportional-integral (PI) controller. When an active power control signal is received from the grid operator, the WPP controller sends the reference power to each PMSG. The proposed pitch control scheme obtains the reference power coefficient (c P ) from the reference and available powers; then, it analytically determines a target pitch-angle to meet the reference c P from the c P function. To reduce the rotor speed fluctuation, the target pitch-angle is determined to maintain the optimum tip speed ratio during active power control. The performance of the scheme was investigated using an EMTP-RV simulator. Test results indicate that the scheme successfully reduces the fluctuations of pitch-angle and rotor speed during the active power reduction while satisfying the active power control requirement.