| 基于零序电压注入的三电平NPC逆变器中点电位平衡控制方法 |
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| 引用本文： | 宋强,刘文华,严干贵,王仲鸿.基于零序电压注入的三电平NPC逆变器中点电位平衡控制方法[J].中国电机工程学报,2004,24(5):57-62. |
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| 作者姓名： | 宋强 刘文华 严干贵 王仲鸿 |
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| 作者单位： | 清华大学电机工程与应用电子技术系,北京,100084 |
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| 摘 要： | 针对三电平中点箝位(NPC)逆变器的中点电位平衡控制问题，该文建立了基于零序电压注入的中点电位平衡控制模型，提出了所需注入零序电压的准确解析计算方法，并在此基础上提出了“预估-校验-修正”的实时控制算法。根据解析计算结果，分析了中点电位平衡控制所受的限制，及由此决定的中点电位完全可控区域。针对6kV／1800kVA三电平调速系统的仿真结果表明所提算法是正确且有效的。
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| 关 键 词： | 三电平NPC逆变器 零序电压 中点电位平衡控制 拓扑结构 负载电流 |
| 文章编号： | 0258-8013(2004)05-0057-06 |
| 修稿时间： | 2003年9月21日 |
A NEUTRAL-POINT POTENTIAL BALANCING ALGORITHM FOR THREE-LEVEL NPC INVERTERS BY USING ANALYTICALLY INJECTED ZERO-SEQUENCE VOLTAGE |
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| SONG Qiang,LIU Wen-hua,YAN Gan-gui,WANG Zhong-hong.A NEUTRAL-POINT POTENTIAL BALANCING ALGORITHM FOR THREE-LEVEL NPC INVERTERS BY USING ANALYTICALLY INJECTED ZERO-SEQUENCE VOLTAGE[J].Proceedings of the CSEE,2004,24(5):57-62. |
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| Authors: | SONG Qiang LIU Wen-hua YAN Gan-gui WANG Zhong-hong |
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| Affiliation: | SONG Qiang,LIU Wen-hua,YAN Gan-gui,WANG Zhong-hong Department of Electrical Engineering,Tsinghua University,Beijing 100084,China) |
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| Abstract: | This paper proposes a novel neutral-point (NP) potential balancing model based on analytically injected zero-sequence voltage for three-level neutral-point-clamped (NPC) inverter. An analytical method is proposed to accurately calculate the zero-sequence voltage for NP potential balancing. A "test-verify-revise" method is proposed as well for real-time implementation of NP balancing control. Based on the analytical analysis, the restriction to the NP balancing control is analyzed, and the NP-fully-controllable region is given. The feasibility of the proposed algorithm is verified by simulation results for a 6kV/1800kVA medium voltage drive. |
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| Keywords: | Neutral-point clamped inverter Neutral-point potential control Pulse width modulation |
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