Modulation Strategy for Three-level Neutral-Point-Clamped Converter Achieving Clamping Diodes Loss Control
Modulation Strategy for Three-level Neutral-Point-Clamped Converter Achieving Clamping Diodes Loss Control
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DOI：
10.1109/ecce50734.2022.9948187
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发表时间：
2022-10
期刊：
影响因子：
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通讯作者：
Xiang Lin;D. Dong
中科院分区：
文献类型：
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作者：
Xiang Lin;D. Dong
对于中压（MV）三电平（3L）中性点钳位（NPC）变换器，期望最小化钳位二极管体积以降低变换器的成本和占地面积，更不用说简化层压总线结构。在传统的3L调制方法中，箝位二极管的导通损耗在不同的工作条件下（例如，额定功率和功率因数）会发生显著变化。因此，二极管的选择需要涵盖最坏的情况。为了降低箝位二极管的成本和体积，本文提出了一种新的调制策略，通过将3L调制和准二电平（Q2L）调制相结合来控制箝位二极管的损耗。文中介绍了具体的调制策略。然后给出了所提出的调制策略、Q2L调制和3L调制的总器件损耗比较。为了验证所提出的调制策略，对具有10 kV SiC MOSFET的3L NPC相腿进行了测试，并且所提出的调制策略得到了验证。
For the medium voltage (MV) three-level (3L) neutral-point-clamped (NPC) converter, minimizing the clamping diodes volume are desired to reduce the cost and footprint of the converter, not to mention the simplification of the laminated bus-structure. In the traditional 3L modulation methods, the conduction losses of clamping diodes change significantly under different operation conditions, e.g. power rating and power factors. Therefore, the selection of diodes needs to cover the worst scenario. In this paper, to help reduce clamping diodes cost and volume, a new modulation strategy is proposed to control the losses of the clamping diodes by operating the 3L NPC converter in the combination of 3L modulation and quasi-2-level (Q2L) modulation. The detailed modulation strategy is introduced in this paper. The total device loss comparison of the proposed modulation strategy, Q2L modulation, and 3L modulation is then presented. To verify the proposed modulation strategy, 3L NPC phase leg with 10 kV SiC MOSFET is tested, and the proposed modulation strategy is verified.