Carrier-Based Pulse Width Modulation for Symmetrical Six-Phase Drives
Carrier-Based Pulse Width Modulation for Symmetrical Six-Phase Drives
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DOI：
10.1109/tpel.2015.2389896
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发表时间：
2015-01
影响因子：
6.7
通讯作者：
Daniel Glose;R. Kennel
中科院分区：
文献类型：
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作者：
Daniel Glose;R. Kennel
由于逆变器的开关行为，调制电压源逆变器 (VSI) 的输出本质上会导致负载侧的电流失真。本文介绍了一种减少六相驱动装置失真的方法。该装置由连接到两个三腿两级 VSI 的六相电机组成。机器内的相位对称排列并在空间上偏移 60°。这些相被分组，从而形成两个传统的三相组，每个组由一个逆变器供电。通过将三角载波波形与所需基波进行比较来调制每个逆变器桥臂的输出。以这种方式布置，驱动设置提供了额外的自由度，即两个载波波形的相移。结果表明，根据机器参数，存在一个最佳角度，对于一定幅度的基波，该角度可以减少驱动器的谐波损耗。与具有两电平或三电平逆变器拓扑的传统三相驱动器相比，由此产生的总体电流失真甚至可以更低。对于三种不同的调制技术，最佳相移角以精确的形式导出，自然地，对称规则和非对称规则采样脉宽调制。从精确解中获得具有合理精度的近似值。模拟和实验测试验证了理论考虑。
Modulating the output of a voltage source inverter (VSI) inherently causes current distortions on the load side due to the switching behavior of the inverter. This paper describes a method to reduce these distortions for a drive setup with six phases. The setup consists of a six-phase machine connected to two three-leg two-level VSIs. The phases within the machine are symmetrically arranged and spatially shifted by 60°. The phases are grouped so that two conventional three-phase sets are formed, each fed by one inverter. The output of each inverter leg is modulated by comparing a triangle carrier waveform with the desired fundamental wave. Arranged in this way, the drive setup offers an additional degree of freedom, the phase shift of the two carrier waveforms. It is shown that, depending on the machine parameters, there exists an optimal angle, which reduces the harmonic losses of the drive for a certain amplitude of the fundamental wave. The resulting overall current distortion can even be lower compared to a conventional three-phase drive with a two or three-level inverter topology. For three different modulation techniques, the optimal phase shift angles are derived in an exact form, naturally, symmetrical regular and asymmetrical regular sampled pulse width modulation. An approximation with reasonable accuracy is achieved out of the exact solution. Simulations and experimental tests validate the theoretical considerations.