摘  要：随着煤矿生产能力的提高，对矿用大型设备配套变频器的功率要求越来越大，传统的逆变器由于功率管承受电压大和输出电压的谐波含量大，已不能完全满足生产的需要。该文阐述了矿用中压大功率变频器的工作原理，分析了三电平逆变器的结构、工作模式、扇区的划分。进而推导出其数学模型。在此基础上提出了输出电压瞬时值控制系统。试验证明了该系统使功率管承受电压减小一半，输出电压波形更接近正弦波，大大地降低了谐波，为矿用大功率变频器中的逆变器的设计提供了一种可行的方法。
关键词：矿用中压；三电平逆变器；扇区

Abstract: With the gradual increasing of coal production capacity, the requirement of transducer in mining large-scale production equipment is also increasing. Owing to the power tube bear much voltage and output voltage contain much harmonic wave, the traditional inverter is unable to meet the needs of production.This paper dealed with the working principle of mining medium voltage of great power transducer and analyzed inverter structure, working patterns and sector division, then deduced its mathematical model. On this basis, output voltage and instantaneous value of control system was proposed. The experiment demonstrates the system decreases inverter power tube voltage to half. Thus, the output voltage is closer to sine wave and greatly reduce the harmonics, which provide a method for the inverter design of great transducer in mining.
Key words: mining medium voltage; three-level inverter; sector