单元串联型中高压变频器是目前电力电子领域研究的热点之一，它具有输入侧对电网污染小、输出电压接近正弦波、不需要输出滤波器等优点。中高压变频控制器作为变频调速系统控制的核心，本课题将其作为研究对象，以单元串联多电平拓扑结构为基础，通过研究开发，完成了高压变频控制器的硬件及软件设计，实现了变频调速控制，使系统能够安全、稳定运行。 首先，本文分析比较了几种中高压变频系统的拓扑结构和特性，详细阐述了本实验系统所采用的单元串联多电平拓扑结构，并从系统组成、硬件电路及功率单元等方面进行了详细的分析。 其次，本文针对单元串联多电平拓扑结构，分析比较了几种采样方法和调制方法，并进行了仿真。通过仿真结果比较得出：载波水平移相SPWM调制可以提高等效开关频率，使输出波形电平数增加，改善输出波形，输出波形谐波含量小，保证单元输出功率一致，适合应用于单元串联多电平高压变频器。 接着，本文完成了高压变频控制器的硬件和软件设计。硬件方面，完成了控制器的硬件框架设计和搭建，包括中心DSP控制板框架、脉冲扩展板光纤接口电路以及CAN总线通信接口等。软件设计方面，详细阐述了由中心DSP控制板处理的V/f变频调速软件设计，由脉冲扩展板处理的SPWM脉宽实时计算及分配的软件设计以及用于中心DSP控制板与脉冲扩展板之间进行数据传输的CAN总线通信软件设计。 最后，对本课题开发的高压变频控制器进行了实验。实验结果验证了本课题所开发的控制器能够完成变频调速控制，及载波水平移相SPWM调制，使系统安全、稳定运行。

The cascaded multilevel inverter has become to a hotspot in the industry of power electronic. It has much advancement, such as little pollution to the input, almost sine wave of output and no need of filter for output, etc. The controller of the high voltage inverter is the kernel of the high voltage frequency variable speed adjusting system, and this topic takes the controller as the research object, based on the series cell multi-levels topology structure. By the researching and developing, we finished the hardware design for the inverter controller and realized the real time computation of the SPWM pulse width and the controlling of the speed variation, and the tested system can be controlled and run in safe and stable. First, we analyzed and compared the features of several different high voltage inverter system topology structures, and introduced specially the series cell multi-level topology structure, which is used as our experiment system, from its system constitute, hardware circuit and power cell in detail. Second, on the basis of series cell multi-level topology structure, we compared several sampling methods and modulating methods by simulations. According to the results of the simulations, it shows that we can promote the equal switching frequency by the method of carrier level phase-shift modulating, and increase the numbers of the level of output wave, and make the output wave good, and the sameness of the output power for all cell power. Third, we finished the software design and hardware design of the controller. For the hardware design, we present the coupling, including the DSP board, plus extension board and the CAN bus part. For the software design, we discussed the design of speeding control, which is handled by DSP, and how to realize the real time computing of the SPWM pulse width in detail, also CAN bus communication design. Finally, we tested the developed controller for the high voltage inverter device. The result of the testing verified that this controller can complete the control of the frequency variable and speed adjusting, and the modulating method of carrier level phase-shift SPWM. It is running in safely and stable.