Research On Integrated Permanent Magnet Wind Generator And Its Control

For the problem existing in manufacturing,transportation,installation and maintenance of high-power permanent magnet wind power generation system,a novel integrated permanent magnet wind power generation system is proposed in this thesis.In particular,the structure and performance of the generator ontology are studied,and the whole control system is designed with this kind of generator as the study subject.Furthermore,the simulation model of the system is set up and studied in the hybrid simulation environment.Firstly,in view of the problem of overall development of the stator,installation difficulty and redundancy control in high power permanent magnet generator,a special structure of integrated permanent magnet generator is presented in this thesis.Then,the stator,rotor and winding of the generator are studied separately,and the splitting and restructuring of the integrated permanent magnet generator is analyzed.Next,the structural integrated design method of integrated permanent magnet generator is summarized,and 2D simulation model of integrated permanent magnet generator under Ansys Maxwell software is designed.Besides,the mathematical model of this generator is derived.Secondly,due to special characteristics of this integrated permanent magnet generator and being unable to estimate the speed using the method of installing a photoelectric encoder,the zero-sequence carrier voltage speed sensorless estimation method is proposed in this thesis.The mathematical expression of zero-sequence carrier voltage in different coordinate systems is derived,and modulation and filtering process of zero-sequence carrier voltage signal is analyzed.Furthermore,the design flow of the zero-sequence carrier voltage estimator is given,and the advantage of this estimator is also summarized.Thirdly,aiming at problem of unsynchronized operation of each module generator caused by stator winding design error,parameter variation and load disturbance,a multi-module generator distributed cooperative control method is presented.Then,from the perspective of linear generator,the multi-module generator thrust synthesis equation is derived and the thrust synthesis condition of each module is further given.Next,according to the entire system synchronization control requirement,the multi-module generator synchronous running objective function is defined.Based on this the adjacent module coupling error function is established.At last,based on the H∞ adaptive control theory,a multi-module generator distributed cooperative controller for integrated permanent magnet generator is designed.The stability and convergence of the controller is analyzed.Finally,the simulation model of the generator body,the main circuit and the control algorithm of system are built in the hybrid simulation environment of Ansys Maxwell,Ansys Simplorer and Matlab/Simulink,and the interface of the joint simulation is set up.Based on the simulation model,the proposed zero-sequence carrier voltage estimation method and distributed cooperative control strategy are verified and analyzed respectively.Simulation results demonstrate the validity and feasibility of proposed method.