Doubly-fed Asynchronous Wind Power System Network Side Converter Control And Simulation Research

Due to the flexible space truss structure, smaller to main grid disturbance,distributed energy technology get fast development in the micro grid system, thedoubly-fed wind power system is the island one of the important problems in the study ofnew energy micro grid. This article mainly discusses the doubly-fed wind power systemnetwork side converter for related research.First of all, this article mainly introduced the development present situation aboutdoubly-fed wind power system network grid side converter island micro-power,analyzes the basic theory of doubly-fed asynchronous wind power generationsystem;According to the net side of PWM conver topology structure and workingprinciple,build the mathematical model of PWM converter in different system network;Network side PWM converter is made up of three single-phase voltage source PWMrectifier system, it can run independently controlled and can be coordinated control, sowere mainly studied of single phase full bridge topology of voltage source PWM rectifiersystem and its basic theory; Builded the simulation model Under Matlab2011a/simulinksoftware, studied and designed the phase-locked loop of single-phase PWM rectifier onthe basis of simulation model; Builded the embedded code generation of single-phasePWM rectifier system control program on the basis of the simulation model, anddebugging and analysis of the experimental phenomena combined with the hardwareplatform of single-phase rectifier system hardware; When grid asymmetric fault occurs,the net side current and voltage characteristic is analyzed.Secondly,according to the interconnection specification of wind power generationsystem, doubly-fed wind power system must have low voltage across ability, so research for doubly-fed wind power system low voltage operation characteristics when gridvoltage drop failure occurs.Finally, according to the doubly-fed wind power system low voltage operationcharacteristics of island micro power grid, based on the rotor side lever Protection(Crowbar Protection) through technology and based on the dc side low voltage side ofthe combined energy storage Protection of low voltage through technology are presentedin this paper. Focus on the rotor side lever protection circuit protection resistance valuesize and combined energy storage protection in dc side circuit topology, theestablishment of simulation model and the analysis of the experimental phenomena;Validated by the experiment phenomenon, the combined DC/DC converter of thefeasibility of the energy storage protection circuit.