【摘要】 针对现有的模块化多电平变换器基本单元的设计方案所存在的通信机构复杂,可靠性低的问题,对子模块的结构设计、通信设计及优化等问题进行了研究,在此基础上提出了一种新的子模块设计方案,同时给出了其与上层控制器的通信协议。该通信协议利用两根光纤完成子模块与上层控制器的信息交互,其中子模块的电压与状态信息通过串行通讯方式上传给上层控制器,而由上层控制器所产生的驱动与保护命令等信号通过光纤时分复用技术发送至子模块,由子模块进行解析并完成相关任务。研究结果表明,所提出的设计方案能够可靠地完成子模块与上层控制器之间的通信,所用光纤减少为2根,简化了其与上层控制器之间通信机构的设计,同时提高了模块化多电平变换器系统的可靠性。更多还原

【Abstract】 For the problems that the existing design schemes of the basic unit of modular multilevel converter( MMC) are too complex and unreliable,the research on structural design,communication design and their optimization were studied. A novel design scheme of sub-module and the corresponding communication protocols between it and the upper controller were proposed. In the scheme,two optical fibers were used to complete the communication work. The voltage and states of the sub-module were uploaded to the upper controller by serial communication interface( SCI). At the same time,the switch signal and protection order generated by the upper controller were sent to sub-module by the time division multiplexing technology,and then analyzed by the sub-module controller to execute the corresponding task. The results indicate that the proposed design scheme can accomplish the communication between the upper controller and sub-module reliably. The usage of optical fiber is reduced to two,which simplify the communication mechanism and enhance the reliability of the overall system of MMC.更多还原