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.
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.
本文对中压大功率电动机变频调速的技术特点和电路结构进行了分析，阐述了多电平变频器的工作原理。
The technical features of medium voltage high power inverter and the basic structure of its electric circuits are analyzed.
串联H桥多电平变频器的主回路从结构上可分为三相电容滤波不可控整流电路和单相电压型全桥逆变电路。
The series H-bridge multilevel converter's power circuit is composed of uncontrolled rectifier with filtering capacitor and single phase H-bridge voltage-type inverter.
该变频器采用单元串联多电平技术，可以得到阶梯SPWM波形，无需输出滤波器，可直接驱动普通电动机。
The (frequency) converter (adopted) multilevel technology with cells series, which could obtain stepped SPWM waveforms, and could drive ordinary motor directly with no output filter.
这种中压变频器输出电压为多电平pwm脉冲波形，目前对其谐波还没有完善的理论分析。
Output voltage of this type ASD is multilevel PWM waveform, and by now there is not perfect theoretical analysis for its harmonics.
详细阐述了单元串联多电平高压变频器的工作原理、系统结构以及脉冲控制的策略。
The work principle, system structure, and pulse control strategy of the cell series multi-level converter are discussed in detail.
单元串联多电平pwm电压源型6k V变频器采用若干个低压PW M变频功率单元串联的方式实现直接高压输出。
The 6kv transducer with the series-wound unit of the PWM pressure type can realize the output of the direct high pressure by collecting a lot of lower frequency conversion pressure.
本文着重介绍国产多电平型高压变频器在海南儋州那大十万吨水厂的应用情况，对其节电情况进行对比。
The application of domestic Multi-level High voltage inverters in Hainan Danzhou's 100,000 Ton level Water Factory is introduced in this paper, and the energy-saving effect is also shown here.
本文着重介绍国产多电平型高压变频器在海南儋州那大十万吨水厂的应用情况，对其节电情况进行对比。
The application of domestic Multi-level High voltage inverters in Hainan Danzhou's 100,000 Ton level Water Factory is introduced in this paper, and the energy-saving effect is also shown here.
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