Research On Anti-saturation Control Of Permanent Magnet Synchronous Wind Power Generation Syste

At present,wind power has been developed rapidly as a clean and renewable energy and has important practical value in the field of commercialization and industrialization.The direct-drive permanent magnet wind power generation system has the characteristics of simple structure,high efficiency and high reliability,and has good development potential,so it has been widely concerned.The permanent magnet synchronous generator(PMSG)is the core component of the direct-drive permanent magnet wind power generation system,and its operating conditions will directly affect the safe and stable operation of the system and the maximum wind energy capture of the wind turbine.Considering that PMSG often works under complex and changeable conditions,it will inevitably encounter problems such as input saturation,parameter uncertainty,and external interference.In order to solve the above problems,this paper takes the PMSG with strong coupling and large moment of inertia as the research object.By studying control algorithms such as speed regulation,saturation compensation,speed tracking,and interference suppression of PMSG system under saturation constraints,the tracking performance of PMSG on the optimal speed of wind power generation system as well as the anti-saturation and anti-interference capabilities are improved.To ensure the safe and stable operation of permanent magnet synchronous wind power generation systems in the process of wind energy conversion so as to achieve the maximum wind energy capture of the wind turbine and improve the utilization efficiency of wind energy.The research contents of this paper are as follows:1)Anti-saturation coordination control of permanent magnet synchronous wind power generation system.A hybrid coordination control strategy based on adaptive sliding mode and port control Hamiltonian is proposed to solve the problem of anti-saturation control for permanent magnet synchronous wind power generation systems.Firstly,an adaptive sliding mode controller is designed based on the saturation compensation method to solve the problems of saturation and model parameter uncertainty.Secondly,a controller based on the system’s port-controlled Hamiltonian model is designed to reduce output chattering caused by sliding mode control.Then,the adaptive sliding mode control and port-controlled Hamiltonian control are combined by the exponential function with parameters as the coordination function to realize the coordination control.By adjusting the parameters,the designed coordination function can respond to input saturation more quickly and improve the dynamic performance of the system.The simulation results show that the coordination control strategy can better combine the advantages of the two control methods,and the control system has good dynamic and steady-state performance.2)Passive-based active disturbance rejection control for permanent magnet synchronous wind power generation system with saturation constraints.In order to solve the problem of the speed tracking control of permanent magnet synchronous wind power generation systems that are subject to saturation constraints and disturbances,a model compensation passive-based active disturbance rejection control strategy is proposed.Taking advantage of the fact that active disturbance rejection control technology can estimate and compensate for the internal and external disturbances of the system in real time to make the system more robust to the changes of its own parameters and external disturbance.A model compensation passive-based active disturbance rejection controller is designed by using the passive control method of interconnection and damping configuration,and the nonlinear sector method is introduced to solve the saturation constraint problem of the system.A double closed-loop control system is constructed by both control methods: the passive-based control is used as the current inner loop,and the model-compensation active disturbance rejection control is used as the speed outer loop.Simulation and experimental results show that the control strategy can effectively reduce overshoot,improve the system’s response speed,have a good anti-interference ability,and effectively suppress the influence of saturation constraints on the system.