Study On The Technology Of Converter For Doubly-Fed Induction Wind Generator

With the rapid development of industrial energy consumption growing increasingly serious environmental pollution, forcing people to consider new and renewable sources of energy development and utilization. Which wind energy because of its outstanding advantages of much concern to most countries in the world, Doubly-fed VSCF wind power generation technology its low cost, high efficiency wind power generation technologies become mainstream. The use of variable speed constant frequency technology greatly enhanced the utilization of wind energy. In VSCF wind power generation system, it is necessary to complete the frequency converter to the grid by generating energy transfer.The main contents of this paper is organized around doubly-fed wind power generation system used in the doubly-fed machine and dual-PWM converter and its associated control technology, discussion and research and simulation. In this essay, we introduce the current development situation of wind power generation, wind turbine emulation technology, a brief analysis of AC-DC-AC converter for VSCF wind power generation system of the basic principles, and the operation of doubly-fed machine principles controling strategy of grid-side converter in Double fed induction wind power system,Doubly-fed generator of three-phase static coordinate system in the mathematical models and two-phase rotating coordinate system under the study of mathematical models, based on stator flux oriented vector control strategy, the realization of a doubly-fed generator active power and reactive power decoupling power.Finally, in the Matlab/Simulink platform for the software simulation, simulation results prove the correctness of the control method, simulation tests to verify the rotor side converter can achieve better tracking of changes in wind, control the characteristics of doubly-fed machine;grid-side converter can achieve unity power factor and unity power factor rectifier and the inverter DC side voltage stability functions, verify the established model of the converter has the ability of low voltage ride through(LVRT).