适用于矿井提升机控制的模块化多电平变流器研究

发布时间：2018-05-05 16:22

本文选题：矿井提升机 + 模块化多电平变流器　；参考：《兰州理工大学》2017年硕士论文

【摘要】：随着电气传动技术的飞速发展,多电平变流器已在矿井提升机中得到了广泛应用,对改善设备性能和节能减排具有重大的意义。模块化多电平变流器(Modular Multilevel Converter,MMC)以其独特的结构优势,弥补了传统多电平变流器的许多不足,特别适用于中高压大功率场合。将MMC应用于矿井提升机具有较高的发展前景和实用价值。本文主要对用于矿井提升机控制的模块化多电平变流器进行了研究。首先,对比了目前应用在矿井提升机中的三种多电平变流器结构优缺点,分析了MMC自身的诸多优点和不足。然后在矿井提升机的应用背景下,介绍了MMC的工作原理、数学模型和调制方式,并研究了用于提升机控制的背靠背MMC前端PWM整流器的结构和控制方法。其次,分析了MMC在应用于矿井提升机运行时子模块电容电压的波动规律。通过数学推导得到了电容电压波动幅值的表达式,得出了电容电压波动幅值与电流幅值和基波频率之间的关系。研究了一种抑制电容电压低频波动的控制算法,将MMC低频运行时的电压波动抑制在合理的范围内,并通过Matlab/Simulink搭建模型对该控制算法进行了仿真验证。最后,设计和搭建了用于模拟矿井提升机运行控制的三相10KW MMC实验平台,其中控制器采用DSP和CPLD的两级控制结构。对系统控制电路、主电路和子模块电路的设计进行了详细说明。最后设计了提升机控制程序和驱动程序,并给出了相关实验波形。
[Abstract]:With the rapid development of electrical transmission technology, multilevel converters have been widely used in mine hoists, which is of great significance to improve the performance of equipment and save energy. Modularized multilevel converter (Modular Multilevel converter MMC) makes up for many shortcomings of traditional multilevel converters due to its unique structural advantages and is especially suitable for high power and medium voltage applications. The application of MMC in mine hoist has high development prospect and practical value. In this paper, the modularized multilevel converter used in mine hoist control is studied. Firstly, the advantages and disadvantages of three kinds of multilevel converters used in mine hoist are compared, and the advantages and disadvantages of MMC itself are analyzed. Then under the application background of mine hoist, the working principle, mathematical model and modulation mode of MMC are introduced, and the structure and control method of back-to-back MMC front-end PWM rectifier for hoist control are studied. Secondly, the fluctuation law of capacitance voltage of sub-module is analyzed when MMC is applied to mine hoist. The expression of the amplitude of capacitance voltage fluctuation is obtained by mathematical derivation, and the relationship between the amplitude of capacitance voltage fluctuation and the amplitude of current and fundamental wave frequency is obtained. A control algorithm to suppress the low frequency fluctuation of capacitor voltage is studied. The voltage fluctuation in the low frequency operation of MMC is restrained within a reasonable range, and the simulation results of the control algorithm are verified by building a model of Matlab/Simulink. Finally, a three-phase 10KW MMC experimental platform is designed and built to simulate the operation and control of mine hoist. The controller adopts the two-stage control structure of DSP and CPLD. The system control circuit, main circuit and sub-module circuit are described in detail. Finally, the control program and driver program of the hoist are designed, and the related experimental waveforms are given.
【学位授予单位】：兰州理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD633;TM46

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