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首页> 外文会议>International Conference on Electrical and Control Engineering >An Improved Neutral-Point Voltage Balancing Algorithm for the NPC Three-Level Inverter Based on Virtual Space Vector PWM
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An Improved Neutral-Point Voltage Balancing Algorithm for the NPC Three-Level Inverter Based on Virtual Space Vector PWM

机译：基于虚拟空间矢量PWM的NPC三电平逆变器中点电压平衡算法的改进

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摘要

This paper explores the limitations of neutral-point voltage balancing problem for different loading conditions and index modulations of neutral-point-clamped three-level inverters. However, the modulation, which based on the virtual space vector concept, that only requires the addition of the output three-phase currents equals zero, guaranteed the balancing of the neutral-point potential for any load over the full range of converter output voltage and for all load power factors. It is the shortcomings of those methods that to estimate the sectors and calculating a lot of trigonometric functions, which results in the increase of the calculating quantity of micro-processor. To solve these problems, a novel method for the virtual space vector concept based on 60o coordinate system is presented in this paper. The method proposed can omit the judging process of the sectors, reduce the calculating burden, and maintain the balance of neutral-point voltage between capacitances within a certain index modulation. The results of simulation are given to validate the improved virtual space vector modulation.
机译：本文探讨了中性点电压平衡问题对于不同负载条件和中性点钳位三电平逆变器的指数调制的局限性。但是，基于虚拟空间矢量概念的调制仅需要增加输出三相电流等于零，就可以保证在转换器输出电压的整个范围内对任何负载的中性点电位进行平衡。对于所有负载功率因数。这些方法的缺点是估计了扇区并计算了许多三角函数，导致微处理器的计算量增加。为了解决这些问题，本文提出了一种基于60o坐标系的虚拟空间矢量概念的新方法。所提出的方法可以省略扇区的判断过程，减轻计算负担，并在一定的指标调制范围内保持电容之间的中性点电压平衡。仿真结果证明了改进的虚拟空间矢量调制的有效性。

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