摘要
变流器并联技术可以有效增加系统容量,但同时对每台变流器之间的数据传输实时性和可靠性要求提高,传统的CAN通讯或RS485通讯传输速率较慢,可靠性较低,导致各变流器模块之间信号同步性较差,难以满足变流器并联的要求。针对这一问题,引入实时以太网Ether CAT技术,提出一种基于Ether CAT的变流器控制系统设计方案。此方案选用倍福公司CX2030型号的PLC作为变流器并联系统的主站控制器,同时利用Ether CAT从站接口控制器ET1100与DSP芯片TMS320F28335共同开发了变流器的从站设备,构建了一主多从的Ether CAT控制系统架构,并进一步给出了控制系统硬件和软件的设计方案。最后,搭建一套采用4台500 k W三电平变流器两两并联组成的功率循环实验平台,并在该平台上采用CAN通讯方案和设计的ETher CAT方案进行对比测试,实验结果表明Ether CAT方案合理、可行,且较CAN通讯方案各从站变流器间的差模环流更小。
The parallel technology of the converter can effectively increase capacity of the system, so good performance of real-time transmission and high reliability between each converter are demanded. EtherCAT technology has precise clock synchronization function and efficient data transmission rate, it can satisfy the synchronicity requirements of the converter parallel system.This paper introduces the real-time Ethernet EtherCAT technology and designs a converter control system scheme based on EtherCAT. This scheme selects the CX2030 PLC of Beckhoff as the master controller. The slaver converter equipment is developed based on EtherCAT slaver interface controller ET1100 and TMS320F28335 DSP chip. The EtherCAT network structure with one master and multipie slavers is built, and a hardware and software design of the control system is provided. Finally, a back-to-back experimental platform is built. It consists of four sets of 500kW three-level converter connected in parallel. Then CAN communication solution and the proposed EtherCAT solution are tested on the platform. Experimental results show that, the proposed EtherCAT solution is reasonable and practicable, and the differential-mode circulating current between the converter is much smaller compared to CAN communication solutions.
出处
《控制工程》
CSCD
北大核心
2016年第1期54-58,共5页
Control Engineering of China
基金
十二五国家科技支撑计划(2012BAA01B00)
