Research On Doubly Salient Electrical-magnet Wind Generator System And Fault Diagnosis Method For Its Rectification Circuit

Doubly Salient Electrical-Magnet Machine (DSEM) is relatively a new type of brushless machine, which offers an excellent balance between costs, reliability and power density as like as Switched Reluctance Machine (SRM). The excitation current could be regulate simply, and make it flexible to control output voltage. The goal of this thesis is to research the characteristics of Doubly Salient Electrical-Magnet Generator (DSEG) used in wind power generation and fault diagnosis technical for its rectification circuit.Firstly, this dissertation introduces the basic structure and operation principle of DSEG. The magnet field of a 24/16 Doubly Salient Electrical-Magnet Wind Generator (DSEWG) is analyzed by Maxwell software. Based on electrical formulas and magnet field analysis, the simulation models of DSEWG and its controller system are established with MATLAB software, and the performances are analyzed.The researches on fault diagnosis and fault tolerant operation are rather important for the reliable generator system. Two open-circuit fault diagnosis algorithms for rectification circuit in DSEWG are proposed in this dissertation. Based on mathematical derivation and simulation analysis, excitation current and rectification current are proposed that could be used as fault detection signal. The experimental results, based on wavelet analysis, indicate that the analysis techniques are accurate and effective.Finally, the design of hardware and software of DSEWG controller based on DSP and CPLD is introduced in detail. A 2kW DSEWG prototype has been set up and its characteristic is given in detail. A series of experiments have been made, and results show that the system has excellent static and dynamic characteristic which validate the feasibility of DSEG application scheme in wind power generation system.