A Research For Double-fed Wind Turbine System And Grid

The energy has a global role of national, social and economicdevelopment, and with the increasing depletion of energy, access to energyuse of generator sets to become the majority of the research focus of scientists.Doubly-fed wind turbine has the advantages of smaller, lower cost, lighterweight, and wind power generation system with variable-speed operation,four-quadrant power flow control, and improve power quality, small capacityinverter. It has become a reliable generator selection, use of double-fed windturbine power generation has become an inevitable trend of the nationalpower generation energy. Thus, for the study of the double-fed wind turbinehas attracted more attention from scholars. Wind power technology has alsobeen a rapid development, By the initial constant speed constant frequency(the Constant Speed Constant Frequency CSCF) wind power system totoday’s variable speed constant frequency (Variable Speed ConstantFrequency, VSCF) wind power generation system. Large-scale wind motorsgroup using induction Excitation pairs of fed wind generator in wind powergeneration technology occupies advantages, and is the future wind powertechnology development of hot spots and trends.This article, the one hand, include power system simulation softwarematlab/simulink simulation platform and AC excited doubly-fed inductionmotor simulation study. The other hand, it built a double-fed wind generatorsand network test after simulink simulation and test contrast, analysis of DFIGsystem and grid control strategy. This paper analyzes the basic structure of theDFIG VSCF operating principle, the energy flow relationship, to establish themathematical model of DFIG dq coordinate system. And it’s constructedbased on the rotor side converter stator flux oriented vector system, includingDFIG no-load and network and access control strategy in the grid. At thesame time, current loop PI regulator designed to improve the dynamicresponse speed and anti-jamming capability. The rotor-side converter and thegrid-side converter control system. Stator flux oriented vector control inrotor-side converter and grid side converter grid voltage oriented vectorcontrol strategy combining methods to achieve grid control. The controlstrategy can quickly control generator stator voltage meet and networkconditions, under conditions of variable speed motor smoothly grid, good power decoupling control and maximum wind energy tracking.Through building test platform for the DFIG stall and no-loadperformance and operating characteristics of pilot testing and performanceanalysis.Doubly-fed induction motor has also been systematically studied inthis paper.