Two-Layer Pulsewidth Modulation Strategy for Common-Mode Voltage and Current Harmonic Distortion Reduction in Vienna Rectifier
Two-Layer Pulsewidth Modulation Strategy for Common-Mode Voltage and Current Harmonic Distortion Reduction in Vienna Rectifier
复制标题
减少维也纳整流器共模电压和电流谐波失真的两层脉宽调制策略
DOI：
10.1109/tie.2019.2937060
复制
发表时间：
2020-09
影响因子：
7.7
通讯作者：
Chenghui Zhang
中科院分区：
文献类型：
--
作者：
Xiangyang Xing;Xiaoyan Li;Changwei Qin;Zhaowei Liu;Chenghui Zhang
维也纳整流器是一种非发电升压型整流器，广泛应用于工业应用中，例如风力涡轮机系统。然而，维也纳整流器将面临降低共模电压（CMV），保持正弦输入电流，并平衡中性点（NP）电压在实践中的挑战。由于这些问题相互耦合，传统的空间矢量调制（SVM）和各种类型的增强方案都无法很好地解决这些问题，尤其是在功率因数不一致的情况下。为了克服这些限制，通过矢量选择的两层脉宽调制方案的开发。在所提出的策略的第一层中，NP电压振荡通过调整开关序列和大，中，小，零矢量的驻留时间与减少的CMV在大，中，零矢量调制相同来减轻。在所提出的策略的第二层中，开关状态被重新选择，并且停留时间被真实的时间调整以消除输入电流中的失真。通过上述两层控制方法，可以同时实现维也纳整流器中CMV减小、输入电流失真消除和NP电压平衡。通过实验验证了该方法的正确性和有效性。
Vienna rectifier, which is a nongenerative-boost-type rectifier, is widely used in industrial applications, such as wind turbine systems. However, the Vienna rectifier will face the challenge of reducing common-mode voltage (CMV), maintaining the sinusoidal input currents, and balancing neutral-point (NP) voltage in practice. As these issues are mutually coupled, the conventional space vector modulation (SVM) and various types of enhanced schemes cannot solve these problems properly, especially under nonunity power factor operation. To overcome these limitations, a two-layer pulsewidth modulation scheme through vector selection is developed. In the first layer of the proposed strategy, the NP voltage oscillations are mitigated by adjusting the switching sequence and dwell time of large, medium, small, and zero vectors with reduced CMV as the same in large, medium, and zero vector modulation. In the second layer of the proposed strategy, the switching states are reselected, and the dwell times are real time adjusted to eliminate the distortions in input currents. Through the aforementioned two-layer control method, CMV reduction, input current distortion elimination, and NP voltage balancing in Vienna rectifier can be realized simultaneously. The correctness and effectiveness of the proposed SVM method are verified by the experiment.
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