Research On Passive Control Of Direct-driven Permanent Magnet Synchronous Wind Generator System

At present,wind power generation technology has been developed rapidly as a kind of clean energy and renewable energy,and has important practical value in the field of commercialization and industrialization.Low speed permanent magnet synchronous generator is the core component of the direct drive permanent magnet wind power system.The direct-drive permanent magnet wind power system has the advantages of simple structure,high efficiency and reliability,because it has good development potential and has been widely studied.In this thesis,in view of the permanent magnet synchronous direct-drive permanent magnet generator in wind power generation system and machine side of communication control methods are studied,the main research contents include machine passive control method of lateral communication and speed sensorless control technology.In this thesis,the main research significance of this topic and the research status and development trend of the permanent magnet synchronous direct drive wind power generation system are introduced.At present,the control strategy of the machine side is introduced and analyzed in detail,and the current research status of the passive control and the application in the field of electric technology are introduced and analyzed.At the same time,the research status and application scope of speed sensor control technology are introduced.Secondly,a brief introduction is made to the permanent magnet synchronous direct-drive wind power generation system,and the mathematical model of the wind turbine and the control mechanism of the maximum power point tracking are described.Different coordinate relationship and transformation is given and its corresponding examples,and established the Permanent Magnet Synchronous Generator(PMSG)in the three-phase static coordinate system,two-phase static coordinate system and the mathematical model of two phase rotating coordinate system.The mathematical model of Euler-Lagrange(EL)and Port Controlled Dissipative Hamiltonian(PCHD)system is introduced.Again,the establishment of rotating coordinates based on the mathematical model of PMSG system,through forming the perspective of energy analysis,combined with passive PCHD control theories and models,to build a direct-drive permanent magnet synchronous generator system,the mathematical model under standard PCHD Passivity-Based Control(PBC)and consider the PMSG system involved in the parameters influence on control precision,enough to create a passive control system based on ESO,at the same time in order to improve the precision of speed loop control,designed based on the inverse hyperbolic sine function since the immunity speed regulator.The control performance of the control strategy is verified by simulation experiment.Then,the thesis is analyzed the deficiency of damping matrix parameters based on ESO,and is designed the fuzzy passive control based on ESO.In order to achieve the direct-drive permanent magnet synchronous wind power system in the full range of speed sensorless control,combined with fractional order calculus and the advantages of fuzzy control principle,build enough speed observer based on fractional order sliding mode control,and USES the Li Yapu rove characteristics show that the stability and convergence of observation.At the same time,the simulation model is established to verify the correctness and validity,and the simulation results are analyzed.Finally,this thesis is summarized the main research results and the research on the basis of this research.