Research on variable frequency system with three-level topology and SVPWM control

Proceedings of The 7th International Power Electronics and Motion Control Conference Pub Date : 2012-06-02 DOI:10.1109/IPEMC.2012.6259256

Shi-cheng Zheng, T. Cui, M. Cheng, Long Chen

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引用次数: 4

Abstract

Working principle of three-level topology and modulation algorithm of space vector pulse width modulation (SVPWM) has been analyzed. And a mathematical expression of the reference voltage has been deduced. Changing the output voltage and frequency synchronously has been realized by changing the dwell time of each vector. And the V/F control demand of electric motor is achieved. In addition, the balancing control strategy of capacitor neutral point voltage balance is presented based on the proposed SVPWM algorithm by adjusting the dwell time of small vector. Finally, the whole system simulation model has been built under the environment of Matlab. The theoretical derivations and control strategies have been verified by simulations. Simulation results show that there are many advantages by using three-level topology with SVPWM control scheme such as high utilization of DC voltage, low harmonics of output voltage, the constant V/f control strategy has been obtained. An important reference value is offered for digital realization of VVVF system in this paper.

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基于三电平拓扑和SVPWM控制的变频系统研究

分析了三电平拓扑的工作原理和空间矢量脉宽调制(SVPWM)的调制算法。并推导了参考电压的数学表达式。通过改变各矢量的停留时间，实现了输出电压和频率的同步改变。实现了电机的V/F控制要求。此外，基于所提出的SVPWM算法，通过调整小矢量驻留时间，提出了电容中性点电压平衡的平衡控制策略。最后，在Matlab环境下建立了整个系统的仿真模型。通过仿真验证了理论推导和控制策略。仿真结果表明，采用三电平拓扑结构的SVPWM控制方案具有直流电压利用率高、输出电压谐波低等优点，可获得恒定的V/f控制策略。本文为变频调速系统的数字化实现提供了重要的参考价值。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Proceedings of The 7th International Power Electronics and Motion Control Conference

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