级联型多电平变频器控制策略除了采用载波相移PWM技术外，阶梯波算法也是一种比较好的控制策略。
The carrier shifted-phase PWM technique can been used in cascade multilevel inverter, in addition, the step waveform strategy is good strategy, too.
论文首先介绍几种传统单元级联型变频器的结构和一些PWM控制策略。
Firstly, several topologies and PWM methods for traditional cascaded converter are introduced in the thesis.
根据系统的特点，设计了级联型中高压变频器的实现方案。
According to the characters of the system, the scheme for cascaded high-voltage converter is designed.
本文提出了一种新型的基于级联结构的高压变频器。
A new high voltage converter based on cascaded multi-level is proposed in this paper.
直接转矩控制具有良好的调速性能，但尚未能应用于级联型多电平变频器。
Direct torque control (DTC) has the high performance of speed control, but it hasn't been utilized to cascaded multilevel inverters at present.
目前，多电平变频器的主要结构形式可分为二极管嵌位型，电容嵌位型和单元级联型三种。
At present, cascaded multicell converter, diode clamped multilevel converter and flying capacitor multilevel converter are 3 mainly converting topologies.
目前，多电平变频器的主要结构形式可分为二极管嵌位型，电容嵌位型和单元级联型三种。
At present, cascaded multicell converter, diode clamped multilevel converter and flying capacitor multilevel converter are 3 mainly converting topologies.
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