变频驱动系统传导干扰建模仿真及抑制

发布时间：2018-06-26 07:47

本文选题：变频驱动系统 + 传导干扰　；参考：《浙江大学》2017年硕士论文

【摘要】：变频驱动系统作为提高电机运行效率,降低生产能耗的有效途径,在工业领域得到了广泛应用。随着变频驱动技术的发展,晶闸管逐步被高性能开关器件替代,PWM技术成为主要的控制方式,这在进一步提高系统输出性能的同时也带来了严峻传导干扰问题,严重影响了变频驱动系统可靠性与兼容性。为此,深入研究变频驱动系统的传导干扰问题并对其进行抑制,对于推动变频驱动技术的发展和应用具有重要的理论价值与实际意义。本文以一种7.5kW通用变频器搭建的变频驱动系统为研究对象,对其传导干扰进行建模与抑制。在当前变频驱动系统传导干扰机理研究的基础上,通过对该系统各个组成模块分别建立高频EMI模型,建立基于Matlab软件的变频驱动系统传导干扰模型,并通过实验测试对传导干扰模型进行验证。其中,在电机阻抗的提取上,本文提出通过时域在线测量的方式提取电机模型参数的方法,解决了应用现场缺少阻抗分析仪的情况下如何准确提取电机阻抗的问题。进而利用仿真模型指导传导干扰抑制方案的设计,提出"建模仿真-参数影响规律-滤波设计"的思路。通过已建立的变频驱动系统传导干扰模型对系统中变频器关键参数以及常用的滤波参数进行仿真研究。在总结关键滤波参数对系统传导干扰的影响规律的基础上,对课题所研究的平台进行滤波设计,提出低配与高配两种滤波方案,使其分别通过EN55011 ClassAGroup2和Group1对变频驱动系统传导干扰的要求。在进行硬件滤波设计的同时,对变频驱动系统软件抑制方法——共模电压抑制PWM策略进行综述研究,并对其研究现状与特征进行了总结。通过仿真对其中的主要共模电压抑制PWM策略在输出谐波性能、输出共模电压特性、线性调制度范围等方面进行了详细的分析并与传统PWM算法进行了对比。
[Abstract]:As an effective way to improve motor operation efficiency and reduce production energy consumption, frequency conversion drive system has been widely used in industrial field. With the development of frequency conversion drive technology, thyristor is gradually replaced by high performance switch device to replace PWM technology as the main control mode, which not only improves the output performance of the system, but also brings severe conduction interference problem. The reliability and compatibility of the variable frequency drive system are seriously affected. Therefore, it is of great theoretical value and practical significance to study and suppress the conduction interference of frequency conversion drive system, which is of great theoretical value and practical significance to promote the development and application of frequency conversion drive technology. In this paper, a 7.5kW universal frequency converter is used as the research object to model and suppress the conduction interference. On the basis of the current research on the conduction interference mechanism of the frequency conversion drive system, the high frequency EMI model is established for each component module of the system, and the conduction interference model of the frequency conversion drive system based on Matlab software is established. The model of conduction interference is verified by experiment. In order to extract the impedance of the motor, this paper presents a method of extracting the parameters of the motor model by on-line measurement in time domain, which solves the problem of how to accurately extract the impedance of the motor in the absence of an impedance analyzer in the field. Then the simulation model is used to guide the design of conductive interference suppression scheme, and the idea of "modeling simulation-parameter influence law-filter design" is put forward. The key parameters of frequency converter and common filter parameters are simulated by the established conduction interference model of frequency conversion drive system. On the basis of summing up the influence of key filtering parameters on the system conduction interference, the filtering design of the platform studied in this paper is carried out, and two filtering schemes, low matching and high matching, are proposed. Through EN55011 ClassAGroup2 and Group1, the requirement of conduction interference in frequency conversion drive system is obtained. At the same time, the common mode voltage suppression PWM strategy, which is the software suppression method of the frequency conversion drive system, is reviewed, and its research status and characteristics are summarized. Through simulation, the main common mode voltage suppression PWM strategies are analyzed in detail in terms of output harmonic performance, output common-mode voltage characteristics, linear modulation range and so on, and compared with the traditional PWM algorithm.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM921.51

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