Imbalance Compensation for SVPWM-Controlled Four-switch Three-phase Inverters
Imbalance Compensation for SVPWM-Controlled Four-switch Three-phase Inverters
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DOI：
10.1109/greentech56823.2023.10173831
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发表时间：
2023-04
期刊：
影响因子：
--
通讯作者：
Hui Zhang
中科院分区：
文献类型：
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作者：
Hui Zhang
四开关三相（FSTP）逆变器作为传统六开关三相（SSTP）逆变器的低成本替代品已经被研究用于各种应用。然而，直流链路中心抽头处的电压波动会显著降低FSTP逆变器的性能，从而导致逆变器输出的不平衡。通过对FSTP逆变器输出电压矢量轨迹的分析，对不平衡进行了表征，并提出了一种自适应SVPWM校正算法，该算法根据直流侧中心抽头电压的实时变化，利用校正因子调整控制参数。本文从理论分析和仿真验证两个方面对所提出的方法进行了深入的讨论。实验结果进一步验证了该方法的有效性。结果表明，即使在中心抽头处存在大量电压纹波的情况下，该补偿方法也是有效的。
Four-switch three-phase (FSTP) inverters have been investigated as low-cost alternatives to traditional six-switch three-phase (SSTP) inverters for a variety of applications. However, voltage fluctuations at the DC link center tap can significantly degrade the performance of FSTP inverters, which leads to an imbalance in the inverter output. By analyzing the vector trajectory of the output voltage in FSTP inverters, this paper characterizes the imbalance and proposes an adaptive SVPWM algorithm to correct it. The method uses correction factors to adjust control parameters according to the real-time voltage at the DC link center tap. The proposed method is thoroughly discussed, both in terms of theoretical analysis and simulation verification. Experiment results are also presented to further validate the proposed method. As demonstrated by the results, the compensation method is effective even in the presence of substantial voltage ripples at the center tap.