SVPWM整流在无刷双馈电机独立发电系统中的研究与应用

发布时间：2018-03-02 15:57

本文选题：无刷双馈电机　切入点：独立发电系统　出处：《华中科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：能源短缺和环境污染等问题的日益凸显,已经成为制约全球经济发展的首要问题。在对风电等可再生能源的开发利用中,关键是要研究出性能达标的发电技术。变速恒频发电技术(VSG)是发电技术领域的一大热点,其中,无刷双馈电机(BDFM)用于VSG系统中成为了一个新的研究方向。该电机省去电刷和滑环结构,可靠性得到很大改善,且降低了电机的维护费用,更重要的是可以用相对低电压、小功率的变流器来实现对电机的控制。基于此,本文的研究内容主要是针对绕线转子无刷双馈电机独立发电系统的作了相关研究。首先,对BDFM的定子和转子结构进行说明,对它运行于发电状态进行了分析。分别推导了BDFM在三相静止abc坐标系下和转子速d?q坐标系下的数学模型。本文以转子速d?q为基础,在Matlab/Simulink仿真环境中对BDFM的发电工况进行了建模与仿真。其次,分析了无刷双馈电机内部的能量流动关系,在此基础上,发电系统采用了谐波含量小、功率因数可调的交—直—交双PWM变频器。介绍了变流器整流侧的基本原理和数学模型,考虑到本文研究的发电系统工作场合的特殊性,即和并网发电情况有所不同,需要变流器整流侧有更快的响应速度,因此,本文对变流器整流侧提出了基于虚拟磁链定向的直接功率控制策略,采用了SVPWM整流调制手段使系统动态的性能得到一定优化。在Matlab/Simulink软件环境中对该整流控制和调制手段进行了仿真。在该仿真的基础上,设计了相应的硬件平台进行实验。本文最后介绍了BDFM独立发电系统的实际控制系统的构成,着重分析了基于TMS320F28335控制系统的设计,且对该控制系统的软件设计进行了详细分析。并在64kW绕线式无刷双馈电机独立发电系统的实验平台上,进行了一系列验证发电质量的实验研究。实验结果表明发电系统的稳态性能和动态性能都能满足要求,验证了本文所采用的控制方法的正确性与实用性。
[Abstract]:The problems of energy shortage and environmental pollution are becoming increasingly prominent, which has become the most important problem restricting the development of the global economy. In the development and utilization of renewable energy sources such as wind power, The key is to find out the power generation technology that meets the standard of performance. VSGs are one of the hot spots in the field of power generation technology. The application of brushless doubly-fed machine (BDFM) in VSG system has become a new research direction. The reliability of the motor is greatly improved, and the maintenance cost of the motor is greatly improved. More importantly, it can be used at relatively low voltage. Low power converter is used to control the motor. Based on this, the research content of this paper is mainly about the independent generation system of brushless doubly-fed machine with winding rotor. Firstly, the structure of stator and rotor of BDFM is explained. The operation of BDFM in the state of power generation is analyzed, and the BDFM and rotor speed d? in the three phase static abc coordinate system are derived respectively. The mathematical model in q-coordinate system. In this paper, the rotor speed d? Q is used to model and simulate the power generation condition of BDFM in the Matlab/Simulink simulation environment. Secondly, the energy flow relationship in the brushless doubly-fed machine is analyzed. On this basis, the harmonic content is small in the power generation system. AC-DC-AC dual PWM converter with adjustable power factor is introduced in this paper. The basic principle and mathematical model of rectifier side of converter are introduced. Considering the particularity of the working situation of power generation system studied in this paper, that is, it is different from grid-connected power generation. Therefore, a direct power control strategy based on virtual flux direction is proposed for the rectifier side of the converter. The dynamic performance of the system is optimized by means of SVPWM rectifier modulation. The control and modulation of the rectifier are simulated in the Matlab/Simulink software environment. The corresponding hardware platform is designed to carry out the experiment. Finally, the composition of the actual control system of the BDFM independent power generation system is introduced, and the design of the control system based on TMS320F28335 is emphatically analyzed. The software design of the control system is analyzed in detail, and on the experimental platform of 64kW winding brushless doubly-fed machine independent generation system, A series of experiments are carried out to verify the power generation quality. The experimental results show that the steady and dynamic performance of the power generation system can meet the requirements, and the correctness and practicability of the control methods used in this paper are verified.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TM614

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