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.
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.
为改善级联型多电平逆变器输出电压波形质量，对通过控制逆变单元开关角实现级联多电平逆变器谐波控制的方法进行了分析研究。
In this paper, the means of harmonics control by selecting switching angles are analyzed for improving quality of output voltage in cascaded multilevel inverter.
针对大容量风电机组的中压变换问题，本文研究一种基于多绕组发电机的模块化级联型变换器，通过模块单元级联实现中压输出，从而省去升压变压器。
This paper has presented a module-cascaded system for multi-coil direct-drive permanent magnet wind generator system with high voltage output, eliminating the grid-side step-up transformer.
针对大容量风电机组的中压变换问题，本文研究一种基于多绕组发电机的模块化级联型变换器，通过模块单元级联实现中压输出，从而省去升压变压器。
This paper has presented a module-cascaded system for multi-coil direct-drive permanent magnet wind generator system with high voltage output, eliminating the grid-side step-up transformer.
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