Space Vector Modulation for Three-Level NPC Converter With Neutral Point Voltage Balance and Switching Loss Reduction
Space Vector Modulation for Three-Level NPC Converter With Neutral Point Voltage Balance and Switching Loss Reduction
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DOI：
10.1109/tpel.2013.2294274
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发表时间：
2014-10
影响因子：
6.7
通讯作者：
Yang Jiao;F. Lee;Sizhao Lu
中科院分区：
文献类型：
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作者：
Yang Jiao;F. Lee;Sizhao Lu
针对三电平中点箝位（NPC）变换器，研究了空间矢量调制（SVM）的不同控制目标，如降低损耗、中点平衡和降低噪声。建立了详细的损耗模型和仿真模型，用于定量损耗和NP电压涟漪分析。提出了一种改进的支持向量机方法，以减少NP不平衡和开关损耗/噪声的同时。协调选择的小矢量考虑NP电荷和脉冲序列，使得在一个开关周期中保证最小化NP涟漪和开关事件。此外，开关周期之间的开关事件也被认为是减少总开关损耗。该方法确保了在不同功率因数下，各相臂中设备损耗的均匀分布以及恒定的系统效率。NP平衡和损耗降低的控制结果进行了验证，通过使用200-kVA的三电平NPC变换器硬件的仿真模型和实验样机。
This paper investigates the different control objectives, such as loss reduction, neutral point (NP) balance and noise reduction of the space vector modulation (SVM), for the three-level neutral point clamped (NPC) converter. A detailed loss model and simulation model is built for quantitative loss and NP voltage ripple analysis. An improved SVM method is proposed to reduce NP imbalance and switching loss/noise simultaneously. The coordinately selected small vectors consider both the NP charge and the pulse sequence so that the minimized NP ripple and switching events are guaranteed in one switching cycle. In addition, the switching events between switching cycles are also considered to reduce the total switching loss. This method ensures an evenly distributed device loss in each phase leg and also a constant system efficiency under different power factors. The control result for NP balance and loss reduction is verified by using both a simulation model and an experimental prototype on a 200-kVA three-level NPC converter hardware.