The Study Of Steady Voltage Control And Steady State Operating Characteristic Of Dual Stator-winding Induction Generator

As a novel induction generator, Dual Stator-Winding Induction Generator(DWIG)overcomes the problems of traditional induction generation system, such as large capacity of excitation converter, serious harmonic pollution. On the other hand, DWIG has the advantages of small volume, high reliability, ability of regulating excitation reactive power continuously and easy maintenance etc. Therefore, DWIG has a broad applicable fields on independent power supply and wind power generation system.However, the researches about DWIG are mainly focused on the steady voltage control effects with rectifier load. The operating characteristics of DWIG with rectifier load, the steady voltage control effects and operating characteristics of DWIG with AC load are seldom studied at present. This thesis focuses on the research of steady voltage control effects and operating characteristics of DWIG with rectifier and AC load.Firstly, the basic structure and the operating principle of DWIG as well as its generation system were briefly introduced. Secondly, based on the voltage equation of DWIG under three phase ABC axis, the dynamic mathematical model of DWIG under two phase stationary axis was deduced in detail. And then, the inner core of DWIG was programmed by using S function of MATLAB, the simulating model was built up.Thirdly, the steady voltage control mechanism of DWIG was analyzed in detail, the basic principle of Hysteresis Current Control Strategy(HCCS) was expounded, and then the Direct Power Control Strategy based on three state optimal switching table(Improved Direct Power Control Stratege, IDPCS) was further proposed. Fourthly,according to HCCS and IDPCS respectively, the steady voltage control effects of DWIG with rectifier load under voltage buildup, variable speed and sudden change of load were analyzed. Furthermore, its no-load regulation characteristics, speed characteristics,load regulation characteristics and efficiency characteristics were analyzed. And then,the steady voltage control effects of HCCS and IDPCS were compared and analyzed.Finally, according to HCCS, the voltage buildup of DWIG with AC load and its steady voltage control effects under variable speed, sudden change of load with different load power factor were analyzed. Furthermore, its operating characteristics were analyzed.And then, the steady voltage control effects of DWIG with rectifier load and AC load were compared and analyzed.The results show that both HCCS and IDPCS can effectively control voltage ofDWIG system, maintain the voltages of power winding and control winding steady under different operating conditions. The dynamic and static voltage stability effects of HCCS are superior to IDPCS. However, the stator current waveform quality of HCCS is not as good as that of IDPCS. The efficiency and the control winding current nature of DWIG depend on speed, load value and load power factor of the power winding. The dynamic voltage stability effect of DWIG with AC load is not as good as DWIG with rectifier load. But the static voltage stability effect, as well as the stator winding current waveform quality of DWIG with AC load is better than those of DWIG with rectifier load, especially under low speed.The study of this thesis provides the theoretical support for the analysis of steady voltage control and operating characteristics of DWIG with rectifier and AC load, as well as the theoretical foundation for the application of DWIG.