CAJ | 학술논문

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。
미전망재련망운행시，일단주망측혹미전망측발생고장회인기보호동작도갑，주전원회수착련망점단로기적도갑신속종PQ운행모식절환도V／f운행모식，단유우수도주종공제기지간통신속도적제약，무법체도무봉절환적효과。위해결저일문제，문중제출채용공업실시이태망EtherCAT총선체대전통적이태망Ethernet총선，이제고각공제기지간적통신속도。급출료대유EtherCAT접구적주공제기화종공제기적연제방안，병이EtherCAT총선위통신총선련접각공제기탑건미전망적협조공제계통。해방법제고료주종공제책략적실시성，실현료미전망재고장상태하종련망모식향고도모식적무봉절환。
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.