Abstract
Due to the fast electric control of the doubly-fed induction generator (DFIG) when experiencing power grid disturbance or turbulent wind, the flexible drive chain of the wind turbine (WT) generates long-term torsional vibration, which shortens the service life of the drive chain. The torsional vibration causes fatigue damage of the gearbox and affects power generation. In this paper, a two-channel active damping control measure is proposed. The strategy forms a new WT electromagnetic torque reference value through two channels: one is a proportion integration differentiation (PID) damping term with frequency difference, which is used to reduce torsional vibration caused by frequency difference between fan and shafting; the other adopts the torsional vibration angle (θs) as the feedback signal, and an additional damping term is formed by bandpass filter (BPF) and trap filter (BRF). The strategy can increase the electromagnetic torque and suppress the torsional vibration of the drive chain. Finally, modeling and simulation using MATLAB/Simulink show that the method can effectively suppress the torsional vibration of the drive chain without affecting power generation.
Highlights
Wind power generation has been growing rapidly throughout the world in recent years, and the doubly-fed induction generator (DFIG) has become a mainstream wind turbine (WT) [1]
Researchers studied the following: control of the DFIG by controlling the active and reactive power [4,5]; the control strategy under the grid fault of WT [6,7,8]; suppression of the torsional vibration by controlling the mechanical torque of the drive chain through pitch angle [9,10,11,12]; control of torsional vibration based on Small-Signal Analysis [13]; electromechanical oscillation damping [14]; and using the variable pitch system and converter as actuators to reduce the dynamic load of the WT to suppress torsional vibration of drive chain [15]
Based on the work this paper proposes a novel active control strategy to reduce the much smaller of the WT,normal the dynamic change of the electromagnetic torqueof thegenerator torsionalisvibration of the than drivethat chain during operation of power grid
Summary
Wind power generation has been growing rapidly throughout the world in recent years, and the doubly-fed induction generator (DFIG) has become a mainstream wind turbine (WT) [1]. Researchers studied the following: control of the DFIG by controlling the active and reactive power [4,5]; the control strategy under the grid fault of WT [6,7,8]; suppression of the torsional vibration by controlling the mechanical torque of the drive chain through pitch angle [9,10,11,12]; control of torsional vibration based on Small-Signal Analysis [13]; electromechanical oscillation damping [14]; and using the variable pitch system and converter as actuators to reduce the dynamic load of the WT to suppress torsional vibration of drive chain [15]. Is proposed, achieving the purpose of suppressing torsional vibration of the drive chain under the premise of ensuring the output power of the unit is stable
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