基于多电平模块换流器的高压变频器控制算法和拓扑研究

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% Q+ c- ?( `0 G7 b3 b1 x摘要:新型高压变频器已经逐渐被用于煤炭企业生产中。这篇论文首先描述了主要组成为多电平模块化换流器（MMC）的高压变频器的基本概念。数学模型是通过分析拓扑结构和基于切换功能的MMC工作机制而建立的。随后，模型被脉宽调制装置（POD-PWM）、电容电压稳定化和基于建模序列算法的平衡控制所控制。通过对比不同的调制器，POD-PWM的优越性得到证实。最后，通过MATLAB-Simulink和RT-Lab进行了仿真测试，结果显示环流器工作正常，电容器上的电压保持稳定。输出波形包含几个谐波。论文还验证了POD-PWM、电压稳定化和平衡控制算法是有效的。

关键词：高压变频器；多电平模块化换流器；调制算法；稳压和平衡控制；RT-LAB
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Abstract:The new type of high voltage frequency converter has been gradually applied in mine enterprises production. This paper first describes the fundamental concepts of the high voltage frequency converter which mainly constituted by modular multilevel converter (MMC). The mathematical model was built  through the analysis of the topological structure and working mechanism for MMC which based on switching function.After that, the model was controlled by carrier phase disposition pulse width modulation (POD-PWM) with capacitor voltage stabilization and balancing control based on modeling-sequencing algorithm. Through the comparison for different modulations, the advantage of POD-PWM is proved. Last, the simulation has been carried out in the software Matlab-Simulink and RT-Lab. The result shows that the converter works properly and the capacitor voltage keeps steady state. The output waveform contains few harmonic waves. It also proves that POD-PWM and voltage stabilization and balancing control algorithm is effective.


Keywords:High voltage frequency converter; Modular multilevel converter;Modulation algorithms; Voltage
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stabilization and balancing control;RT-Lab