Research And Practice On Dual Stator-winding Induction Generator Wind Power System

With the growing energy crisis and the increasingly serious environmental pollution, the exploitation and utilization of renewable energy, especially wind energy has been paid wide attention by the scholars around the world.Based on the background of offshore wind power, and adapted to the trend of HVDC power transmission power, dual stator-winding induction generator (DWIG) wind power system is raised in this thesis, the DWIG of which places two sets of the same pole pairs windings in the stator: One, referred to as power winding, supplies power to the DC load via uncontrolled bridge rectifier, and the other, called control winding, adjusts the excitation reactive current to keep power winding DC side voltage constant when speed varies or load changes through connecting static excitation converter (SEC).This thesis takes the engineering practice of DWIG wind power system which the rated power is 20kW and the rated speed is 750 rpm as the research object. In this thesis, the DWIG mathematical model is established, the control strategy of DWIG generating system is introduced, the main power circuit of the DWIG generating system and the core digital control circuit based on MC56F8346 DSP are designed. According to the experiments including establishing voltage test, operating test under variable speed and load, generator efficiency test, temperature test, loading and unloading test and grid-connected inverter test on the dragging platform in the lab and the transmission chain test, yaw control system test, communication test and loading test on the simulation platform, the correctness of the principles, the rationality of parameter selection and the feasibility of the control strategies are fully verified. Through the experiment test data in the field, the optimal power given curve is fitting out for DWIG wind power system under that wind condition.In addition, in order to research on wind power technology in the laboratory, this thesis designs a set of wind turbine simulation platform, which is based on"transducer + PC + data acquisition card", and empolders the monitoring interface of the wind turbine simulation platform which is based on Labview, so as to lay the foundation for improving the control algorithms of DWIG and studying the maximum wind power tracking algorithm.In the last part of this thesis, the prospect of research is presented, and some problems we have to solve urgently are also put forward.This subject is supported by NSFC(No.50577032) and the National High Technology Research and Development Program of China (863 Program No.2008AA05Z411).