2011年8月电工技术学报Vol.26 No. 8 第26卷第8期TRANSACTIONS OF CHINA ELECTROTECHNICAL SOCIETY Aug. 2011双脉冲测试方法在中点钳位三电平逆变器中的应用研究孟庆云马伟明孙驰王俊炎艾胜（海军工程大学舰船综合电力技术国防科技重点实验室武汉 430033）摘要双脉冲测试已成为两电平逆变电路标准的测试方法，将其直接扩展至中点钳位(NPC)三电平逆变器的测试中，会引起内外管动态电压不均衡的问题。本文采用半桥结构的NPC三电平测试电路，并结合两种典型的吸收电路，通过分析状态转换过程，分析了内外管产生动态电压不均衡的电路机理，并指出这种电压不均衡现象是由于传统双脉冲方式无法正确对内外管电压状态进行有效配置而造成的。本文采用一种简单的三管动作双脉冲测试方法，避免了电压不均衡现象的发生。该方法考虑了开关管的死区时间，可以很好对NPC三电平电路中功率器件的瞬态特性及吸收电路的吸收效果进行测试。最后，通过仿真与实验证明了理论分析的正确性及测试方法的合理性。关键词：NPC 三电平电压不均衡脉冲发送测试方法中图分类号：TM464Research on Dynamic Voltage Unbalance of Inner and Outer Switchin NPC Three Level Circuit TestMeng Qingyun Ma Weiming Sun Chi Wang Junyan Ai Sheng（Naval University of Engineering Wuhan 430033 China）Abstract The double pulse test that is a standard mean in two level inverter is used in the NPC three level inverter, while the problem of voltage unbalance between inner and outer switchs is arisen.Based on three-level half bridge chopper circuit with two different snubbes. The state transition process is analyzied, and the circuit mechanism of voltage unbalance is explained. The reason of voltage unbalance is that the voltage of inner and outer could not be properly configured under the conventional double pulse pattern. The double pulse mean with three-switch action is adopted, and the dynamic voltage unbalance between the inner and outer switchs in conventional test is fully avoided. At the same time, the dead time of switch is considered in the new pulse pattern, and the transient characteristic of power device and the operation performance of snubber circuit can be perfectly tested. The simulation and experimental results show that the theory analysis is right and the proposed test method is rational for testing NPC three level circuit.Keywords：NPC, three-level, voltage unbalance, pulse transmitting, test method1引言二极管中点钳位（NPC）型三电平逆变电路具有诸多优越的系统性能，被广泛应用于工业生产、机车牵引及多相电机驱动等大容量场合[1]。在NPC 三电平逆变器的研制过程中需要对电路进行必要的测试，以掌握功率器件（如IGBT和快恢二极管）的瞬态特性以及吸收电路的工作性能与吸收效果。对于传统的两电平逆变电路，通常是采用斩波电路国家自然科学基金委员会创新研究群体科学基金（50721063）和国家自然科学基金（50607020、50737004ZD）资助项目。收稿日期 2010-06-02 改稿日期 2010-08-04
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