基于GOOSE通信的智能保护装置在青岛地铁中压供电网络的应用

大分区环网接线的中压供电网络在建设投资和运营能耗两方面具有较好的经济性,在地铁供电系统中得到广泛应用。结合青岛地铁11号线工程实践分析指出,大分区环网接线对继电保护的选择性及速动性提出更高的要求;而传统继电保护方案依靠时间级差配合满足选择性要求,会造成保护动作延时过长、与城网变电站保护匹配性差、设备热稳定性要求高等问题,已难以满足大分区环网接线的要求。因此,推荐在大分区环网接线的中压供电网络中采用基于GOOSE通信的智能保护配置方案。智能保护方案通过组建专用的GOOSE网络实现本站及相邻车站各智能保护装置之间的数据快速交换,并根据交换的数据信息对过电流保护进行逻辑判断以确定实际的故障发生位置,从而使最靠近故障点的保护装置快速动作。智能保护方案可从根本上解决继电保护的选择性、速动性问题,能够更好地匹配中压供电网络大分区环网接线方案。

Application of Intelligent Relay Protection Device Based on GOOSE Communications in Qingdao Metro Line 11

Owing to economical efficiency in construction investment and operation energy consumption, in recent years, ring connections with large service areas have widely been used in medium voltage power supply network of metros. Combining practices of Qingdao Metro Line 11, the author indicates that the ring connection with large service area requires selectivity and action speed of relay protection, and traditional relay protection methods could not satisfy these conditions because of the problems of long action time, poor matching with urban power networks, and higher thermal stability requirements of power equipment. Therefore, this study introduces the intelligent relay protection plan based on GOOSE communications. By building the GOOSE network, the intelligent relay protection devices in a station and adjacent stations communicate with each other, confirming the fault position according to the logical judgement of over-current protection. This is done on the basis of transfer data; thus, the relay protection device that is closest to the fault position acts rapidly to cut off the short circuit fault. The intelligent relay protection plan based on GOOSE communications has radically solved the problem of selectivity and action speed and shows agreement with the ring connection with large service area.