一种基于EtherCAT的模块化多电平变流器的控制器架构

doi:10.11985/2017.06.001

摘要/Abstract

摘要：

模块化多电平变流器（MMC）具有大量子模块,控制结构系统复杂度和成本均大为增加,且传统的CAN通信或RS 485通信传输速率较慢,可靠性较低,导致各子模块之间信号同步性较差,难以满足多个控制器之间协调运行及高速可靠的通信要求。针对这一问题,本文引入EtherCAT工业以太网技术,提出一种基于EtherCAT的模块化多电平变流器的控制器架构方案。相比于传统分层控制方案,该方案仅包括主站控制器和从站控制器两层,简化了控制结构,而且极大地提高了主从站间的传输速率及可靠性,同时该方案可以精确地保证控制器间的载波信号同步。基于该方案搭建了三相MMC实验平台,实验结果表明了该方案的可行性与正确性。

关键词: 模块化多电平变流器, EtherCAT, 载波信号同步, 实时性, 实验平台

Abstract:

There is a large number of sub-modules in modular multilevel converters (MMC).It make the complexity and costs of MMC much high, and the traditional CAN communication or RS 485 communication cannot meet the good performance of real-time transmission and high reliability between sub-modules for its slow transmission rate, low reliability and poor signal synchronization. In the paper, the real-time Ethernet technology is introduced and a MMC control system scheme is designed based on EtherCAT. Compared to the traditional hierarchical control scheme, this scheme simplifies the control structure with only the master controller and the slave controller, and it greatly improves the transmission rate and reliability between master station and slave station. At the same time, it can accurately control the carrier signal synchronization. Three-phase modular multilevel converter experimental platform is built based on the strategy. The validity of proposed controller architecture is verified by experimental results.

Key words: MMC, EtherCAT, carrier signal synchronization, real time, experimental platform

中图分类号:

TM315

王付胜,袁照栓,鲍金铸,闻俊武. 一种基于EtherCAT的模块化多电平变流器的控制器架构[J]. 电气工程学报, 2017, 12(6): 1-6.

Wang Fusheng,Yuan Zhaoshuan,Bao Jinzhu,Wen Junwu. Controller Architecture of a Modular Multilevel Converter Experimental Platform Based on EtherCAT[J]. Journal of Electrical Engineering, 2017, 12(6): 1-6.

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参数	数值
直流侧电压U_dc/V	100
每相子模块数	8
调制比m	0.9
子模块电容C /mF	3
桥臂电感L_arm/mH	4
负载电感L /mH	4
负载电阻R /Ω	15