Research Of Doubly-fed Wind Turbine Generators Vector Control

As today's world energy crisis and environmental pollution is becoming increasingly serious, as a renewable green energy, wind energy development and utilization of great significance.Countries all over the world have been competing to develop the technology of this field. Among all these technologies, variable speed constant frequency double-fed wind power system is the most widely used. Based on this system, the back to back PWM converters could enable maximum energy capture from the wind. Because of random changes in wind energy which are of the converter has a very high demand, Compared with traditional converters, back to back PWM converters as the core part of the variable speed fixed frequency power generation system has better input, output, low harmonic wave and wide speed regulation range characteristics. The rotor side converter is responsible for the vector control of double-fed machine to capture the maximum wind power based on the given speed and interdentally coordinate the reactive power.Net-side converter in the DC bus voltage to maintain the constant of the DC link through the completion of the rotor and the rotor side converter and the energy exchange between the grid and provide some reactive power.At firstThis paper analyses several aspects including the speed control theory of double-fed machine and its math model, maximum wind power capture based on given active and reactive and some vector control schemes. A few regulation rules such as power regulation, torque regulation, are compared, moreover based on which a control scheme about independent control of active power and reactive power is established.Followed by a magnetic field oriented vector technology will be applied to the VSCF wind power generation system in the new ideas, so be able to communicate more directly control the electrical excitation.Then an analysis math model of three phase PWM converter in d-q reference, based on a stable DC bus voltage and unity power factor operation of the double-loop PI control scheme.Research the experimental of the theory above Construct the doubly-fed VSCF wind power generation system of the experimental platform base on dSPACE Including the detailed design of hardware and software And verified the effectiveness of the control strategy in this paper.through experiments.