微电网协调控制过程中EtherCAT总线的应用  

Application of EtherCAT Bus in Microgrid Coordinate and Control Process

作　　者：李哲[1] 刘澄[1] 徐石明[1] 丁孝华[1] 李文威[1] 

机构地区：[1]中国电力科学研究院(南京),江苏省南京市210003

出　　处：《电力系统自动化》2012年第24期39-43,共5页Automation of Electric Power Systems

摘　　要：微电网在联网运行时,一旦主网侧或微电网侧发生故障会引起保护动作跳闸,主电源会随着联网点断路器的跳闸迅速从PQ运行模式切换到V/f运行模式,但由于受到主从控制器之间通信速度的制约,无法达到无缝切换的效果。为解决这一问题,文中提出采用工业实时以太网EtherCAT总线替代传统的以太网Ethernet总线,以提高各控制器之间的通信速度。给出了带有EtherCAT接口的主控制器和从控制器的研制方案,并以EtherCAT总线为通信总线连接各控制器搭建微电网的协调控制系统。该方法提高了主从控制策略的实时性,实现了微电网在故障状态下从联网模式向孤岛模式的无缝切换。When microgrid connected to main power grid is operating, the breakdown at the main network side or microgrid side may cause protection acting to trip. Then the main power source will operate switching from PQ mode to V/f mode rapidly along with tripping of the breaker at interconnection point. The seamless switchover cannot achieve, because of communication speed limitation between master controller and slave controller. In order to solve this problem, adopting indUstrial real-time Ethernet EtherCAT bus to replace traditional Ethernet bus for increasing communication speed between controllers is proposed. A scheme to develop master controller and slave controllers with EtherCAT interfaces and using EtherCAT bus as communication bus to connect controllers in order to build up a coordinate and control system of microgrid is also given. The method proposed enhances the real-time of master-slave controlling strategy, and realizes the seamless switchover of microgrid operation mode from grid-connected mode to islanding mode when mierogrid is in breakdown.

关 键 词：微电网 EtherCAT总线 协调控制 无缝切换 

分 类 号：TM76[电气工程—电力系统及自动化]