Decoupling Control Method and Simulation Verification of Wind Turbine Based on Multivariable Reference
The variable speed wind turbine adopts pitch and torque regulation control modes respectively.Decoupling control is used to smoothly switch between two control modes,avoiding the problem of unit speed and power oscillation caused by the simultaneous action of torque and pitch regulation or frequent switching.This paper proposes a pitch-torque decoupling control mechanism based on multiple variable references such as pitch angle,torque output,and generator speed,and introduces a time delay judgment condition to achieve the decoupling of torque control and pitch control.Using the above decoupling control strategy,a 3 MW double-fed wind turbine control system and simulation model were constructed based on PLC programmable logic controller and Bladed simulation software.The results showed that the power fluctuation of the wind turbine under rated wind conditions was within±50 kW,and the statistical power curve met the design power curve requirements,which can meet the control requirements of the wind turbine near the rated wind conditions.
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