| With the improvement of science and technology,the demand of power energy is expanding day by day and the problems of resources and environment are becoming more and more prominent.Clean renewable energy such as wind energy and solar energy has become the focus of research.Wind power generation can make full use of existing resources and will not produce pollution,so it is a very feasible way to generate electricity.China has a vast territory and rich wind resources.The cost of small wind power generation equipment is low and the structure is relatively simple which can be used as a way to supplement the power supply of power grid for daily life.It is of great significance to the vast rural areas.According to the characteristics of small wind power generation,a Disc Outer-rotor Switched reluctance Generator(DOSRG)is proposed in this dissertation.The main research work of this dissertation is as follows:(1)Principle and model analysis of DOSRG.The structure and working principle of DOSRG are described.The linear model,quasi-linear model and nonlinear model of the motor are analyzed,and the inductance and current under the linear model are calculated.This dissertation introduces two main excitation modes:self-excitation of motor and other excitation.At the same time,several common control strategies of motor are introduced.(2)Preliminary design of DOSRG.According to project target.Firstly,the main technical indicators of DOSRG are determined,and then the main parameters of the generator are calculated according to these teehnical indicators.And query the data to get the preliminary generator model according to the motor’s experience.Lastly,the steady and transient solver in 2D module of Maxwell finite element simulation software was used to analyze the generator performance and compare with the design target.(3)DOSRG optimization analysis.Through constant step enumeration method,the main parameters that affect the performance of the generator are fine-tuned.In Maxwell finite element transient simulation,the curve is fitted after reading the output power of the motor and calculating the power generation efficiency,and the optimal value is read from many parameters.Through this method,the main parameters of the generator are constantly modified.Finally,the slot shape of the stator and rotor of the motor is simply fine-tuned.And the appropriate generator structure is selected to obtain the optimal motor model.(4)DOSRG co-simulation analysis and verification.The simplorer&maxwell co-simulation system model was established,and the performance indexes of the generator model were verified through the co-simulation results,showing the correctness of the generator design.Different on and off angles are selected for simulation to observe the output characteristics of the generator and determine the most appropriate on and off angle.The running characteristics of the generator at different speeds were analyzed and finally the dynamic speed co-simulation was carried out,which showed that the generator was well designed. |
