Input MPPT Control Of Permanent Magnet Synchronous Wind Turbine Under Saturation

Permanent magnet synchronous wind generator(PMSG)is regarded as the core component of permanent magnet direct drive wind power generation system,which operation condition will directly affect the safe and stable operation of the system and the process of maximum power point tracking(MPPT).Considering that permanent magnet synchronous wind turbine often works under complex and changeable conditions,it will inevitably encounter input saturation and external interference problems.For the sake of solving the above problems,this paper takes the PMSG with strong coupling and large moment of inertia as the research object.Through the research of PMSG control algorithm,such as speed regulation,stabilization under saturation constraints,saturation compensation and interference suppression,the PMSG system is improved.In order to ensure the safe and stable operation of the maximum power tracking process of the wind power system,the tracking performance of the optimal speed(expected speed)of the wind power system and the ability of anti saturation and anti-interference are analyzed.At last,the proposed control algorithm is verified by simulation experiments Evidence.The specific research contents are as follows:1.Port controlled Hamiltonian control of permanent magnet synchronous wind generator under saturation constraint.On existing input saturation constraint and external disturbance of PMSG system,To start with,under the consideration of only the saturation constraint,this paper proposed an energy shaping stabilizing controller for PMSG system based on the form of the energy balance for the PMSG system with input saturation constraint and external disturbance.The PMSG system with saturation constraints is stabilized and the desired speed tracking control is realized,which overcomes the energy shaping obstacle of the PMSG system with saturation constraints.What's more,under the consideration of the condition of input saturation and external disturbance,a robust controller for PMSG system is designed by making full use of L2 interference suppression control method on the basis of the above stabilizing controller design so that the PMSG system can quickly track the desired operating point and operate stably under saturation constraints and external signal interference.At last,the operation effect of the above two controllers is verified through the simulation experiment.2.Coordinated control of permanent magnet synchronous wind generator under input saturation.Aiming at the problem of input saturation constraint and the failure of single controller to optimize the speed of PMSG in the process of maximum power tracking,a coordinated control strategy based on sliding mode anti-saturation control and PCH control was proposed.The sliding mode anti-saturation control solves the input saturation constraint problem of PMSG system and improves the response speed of the system.That PCH control improves the stability and tracking accuracy of the system.The coordination function of the coordination control strategy is based on the hyperbolic tangent function,and the sliding mode anti-saturation control and PCH control can be combined by the coordination function to realize the control of PMSG system together.The simulation results show that the coordinated control strategy can not only track the expected speed of PMSG,but also solve the problem of input saturation during the operation of the generator.