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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。
Inverter parallel technology can effectively increase the system capacity, but at the same time for each converter between the real-time data transmission and reliability requirements increase, the traditional CAN communication or RS485 communication transmission rate is slower, lower reliability, resulting in The signal synchronization between the converter modules is poor, it is difficult to meet the requirements of the converter in parallel. In response to this problem, the introduction of real-time Ethernet Ether CAT technology, proposed a CAT-based converter control system design. This scheme selects Beckhoff CX2030 PLC as the main controller of the parallel system of the converter. At the same time, the EtherCAT slave interface controller ET1100 and the DSP chip TMS320F28335 are jointly developed with the slave devices of the converter, and a Master Ether EtherCAT control system architecture, and further gives the control system hardware and software design. Finally, a set of four 500kW three-level converter power cycle experimental platform consisting of two parallel connected, and in the platform using CAN communication scheme and ETher CAT scheme designed for comparison test, the experimental results show that Ether CAT scheme is reasonable and feasible, and it is smaller than the differential mode circulations among the converters in each slave station of CAN communication scheme.