異步電機(jī)隨機(jī)零矢量控制方法研究
[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.
【學(xué)位授予單位】:安徽大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM343
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