异步电机随机零矢量控制方法研究

发布时间：2018-08-19 07:45

【摘要】：固定开关频率PWM脉宽调制技术在感应电机变频调速控制系统中的应用越来越加广泛。该技术以使功率开关器件按照固定的方式导通和关断为控制目标,来达到相应的控制目的,但是存在着谐波能量集簇的问题,特别是在开关频率的整数倍附近,容易引起电机现场存在的高频噪音和机械振动。为了解决这一问题,从谐波的频谱分布入手,采用随机PWM脉宽调制技术,使逆变器输出的集簇谐波能量均匀分布于较宽的频带范围内。研究结果表明此方法不仅降低电磁噪声和机械振动,而且改善电磁兼容性。本文的主要研究内容如下:首先,对比了传统PWM控制技术,分析了随机PWM技术的基本原理及其分类,论述了随机PWM技术的发展及应用现状,研究了各种常用随机PWM技术异同点,归纳了随机PWM技术最新的研究趋势。然后,分析了常用随机数的软件生成方法和随机数随机性能的检验方法,研究了马尔科夫链和马尔科夫过程,使用了用于异步电机矢量控制的马尔科夫链随机开关频率PWM技术。分别基于固定开关频率算法和马尔科夫链算法研究了异步电机随机PWM矢量控制仿真模型,并进行对比分析。最后,研究了一种简化的脉宽调制技术,并提出了一种新颖的随机零矢量PWM算法,通过对零矢量进行随机控制,仿真验证了该方法的有效性和正确性。仿真和实验结果验证了算法的有效性,且不改变现有电机控制的拓扑结构,可以方便地应用于现有交流电机矢量控制系统中,可以满足变频变速系统对电机噪声、机械振动以及电磁兼容性的要求。
[Abstract]:PWM pulse width modulation technology with fixed switching frequency has been widely used in frequency conversion speed control system of induction motor. The control goal of this technique is to make the power switch devices switch on and off according to the fixed mode to achieve the corresponding control purpose, but there exists the problem of harmonic energy cluster, especially near the integer times of the switching frequency. It is easy to cause high frequency noise and mechanical vibration. In order to solve this problem, the random PWM pulse width modulation technique is used to solve this problem. The cluster harmonic energy of the inverter is uniformly distributed in a wide frequency band. The results show that this method not only reduces electromagnetic noise and mechanical vibration, but also improves electromagnetic compatibility. The main contents of this paper are as follows: firstly, compared with the traditional PWM control technology, this paper analyzes the basic principle and classification of stochastic PWM technology, discusses the development and application status of random PWM technology, and studies the similarities and differences of various common random PWM technologies. The latest research trend of stochastic PWM technology is summarized. Then, the software generation method of common random number and the test method of random performance of random number are analyzed. Markov chain and Markov process are studied. The Markov chain random switching frequency PWM technique is used for vector control of asynchronous motor. Based on the fixed switching frequency algorithm and Markov chain algorithm, the simulation model of stochastic PWM vector control for asynchronous motor is studied and compared. Finally, a simplified pulse width modulation technique is studied, and a novel random zero vector PWM algorithm is proposed. The simulation results show that the method is effective and correct. The simulation and experimental results show that the algorithm is effective and does not change the topology of the current motor control. It can be applied to the existing AC motor vector control system conveniently and can satisfy the noise of the variable frequency variable speed system. Mechanical vibration and electromagnetic compatibility requirements.
【学位授予单位】：安徽大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM343

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