I型NPC式三电平变流器中点电位平衡控制的研究与实现  

Research and Implementation of the Neutral Point Voltage Balance for I-type NPC Three-Level Converter

作　　者：綦慧[1] 卢昭禹 

机构地区：[1]北京工业大学,北京100124

出　　处：《电气技术》2016年第12期59-64,共6页Electrical Engineering

摘　　要：随着清洁能源技术应用领域的不断扩大,对高压输/配电技术提出了更高要求。为此,I型二极管钳位式(NPC)三电平变流器以输出功率大、器件电压应力低等特点逐渐进入了实用阶段。本文中三电平变流器系统采用电压空间矢量脉宽调制(SVPWM),变流器电流控制采用旋转坐标系下(dq)固定频率的直接电流控制策略,并针对变流器中的中点电位平衡控制方法进行了详细分析与设计。这种方法不仅不需要额外的硬件电路,而且大量的系统理论仿真实验和样机实验结果充分验证了该方法的可行性与优越性。With the development of clean energy, more requirements for high voltage electricity transmission and distribution are proposed. The I-type diode neutral point clamped（NPC） three-level converter is practical used for its high capacity and low device voltage stress. In this paper, three-level space vector pulse width modulation（SVPWM） and the direct current control at fixed frequency based on the rotational coordinates（dq） are adapted in the converter. The neutral point voltage（NPV） imbalance is specifically analyzed to design a control method. This method does not need any additional hardware circuit. Results of simulation and experiments have demonstrated the feasibility and superiority of the proposed approach.

关 键 词：三电平变流器 电压空间矢量调制 直接电流控制 中点电位平衡 

分 类 号：TM46[电气工程—电器]