基于准Z源逆变器的风力发电提水系统研究

发布时间：2018-03-11 13:45

本文选题：风力发电提水系统　切入点：准Z源逆变器　出处：《内蒙古大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着经济社会的快速发展,能源与环境问题日渐突出,调整能源结构使用清洁能源是化简经济发展与环境矛盾的良方。偏远地区人口居住分散、交通不便,常规电网输电成本高技术难度大,致使这些地区的输送电问题一直未能很好的解决。风力发电提水系统可以解决缺电地区的供水问题。但目前的风力发电提水系统存在升压不足,直流链电压利用率不高的现象。本文以基于准Z源逆变器的风力发电提水系统为研究对象,对准Z源逆变器和三相异步电动机的控制进行了研究。主要研究内容如下:首先,论述了风力发电提水系统的背景及意义,并且归纳总结了国内外对风力发电提水系统的研究状况。提出了风力发电提水系统的整体结构,对系统的各组成部分进行了性能分析。其次,分析了准Z源逆变器的拓扑结构和升压原理,计算了准Z源逆变器直流侧阻抗网络的参数,在此基础上提出了三次谐波注入SPWM波的恒占空比调制方法对准Z源逆变器进行控制。再次,进行了风力发电提水系统的设计,对风力发电提水系统的水泵、电动机、风力发电机、准Z源逆变器及蓄水池进行了匹配和选型,设计了三相异步电动机的控制方法。最后,在Matlab仿真软件中搭建风力发电提水系统的仿真模型,对准Z源逆变器直流侧升压和交流侧逆变控制方法进行了仿真验证。对仿真结果进行了分析。结果表明,电动机转速可以稳定的跟踪风速的变化,同时实现了准Z源逆变器的升压控制和三相异步电动机的变频调速,保证风力发电提水系统能够稳定、高效的运行。
[Abstract]:With the rapid development of economy and society, the problems of energy and environment are becoming more and more prominent. Adjusting the energy structure and using clean energy is the best way to simplify the contradiction between economic development and environment. The transmission cost of conventional power grid is very difficult. As a result, the problem of power transmission in these areas has not been solved very well. The wind-powered pumping system can solve the problem of water supply in areas without electricity. The phenomenon of low utilization rate of DC link voltage is studied in this paper. The control of Z-source inverter and three-phase asynchronous motor is studied in this paper, which is based on quasi-Z-source inverter. The main research contents are as follows: first of all, This paper discusses the background and significance of the wind-powered water lifting system, summarizes the research status of the wind-powered water lifting system at home and abroad, and puts forward the overall structure of the wind-powered water lifting system. The performance of each component of the system is analyzed. Secondly, the topology and boost principle of the quasi-Z-source inverter are analyzed, and the parameters of the DC side impedance network of the quasi-Z-source inverter are calculated. On this basis, a constant-duty ratio modulation method for third-harmonic injection of SPWM wave is proposed to control the Z-source inverter. Thirdly, the design of the wind-powered water lift system is carried out, and the pump and motor of the wind-power pumping system are designed. The wind turbine, quasi-Z-source inverter and storage tank are matched and selected, and the control method of three-phase asynchronous motor is designed. Finally, the simulation model of wind-power pumping system is built in Matlab simulation software. The DC side boost control method and AC side inverter control method of Z source inverter are simulated and verified. The simulation results are analyzed. The results show that the speed of motor can track the change of wind speed stably. At the same time, the boost control of the quasi-Z-source inverter and the frequency conversion speed regulation of the three-phase asynchronous motor are realized to ensure the stable and efficient operation of the wind-powered water lifting system.
【学位授予单位】：内蒙古大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM614;TU991

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