煤矿井下电网区域联锁保护方案及其实时性研究

Research of Zone Interlocking Protection Scheme of Underground Power Grid and Its Real-time Performance

针对煤矿井下供电系统通信网络无法满足数据传输实时性、可靠性的要求,很难同时实现保护速动性和选择性的问题,提出了基于交换式以太网的区域联锁保护方案,并采用OPNET网络仿真软件对交换式以太网进行了实时性研究。该方案采用树形结构的交换式以太网,在各综合保护装置上增加具备以太网通信接口的智能联锁装置,组成区域联锁系统。仿真结果表明,在同时有64个网络节点收发数据的极端情况下,网络整体延时最大值不超过0.65ms,端到端最大延时不超过1ms,整体数据收发流量比较平稳,说明交换式以太网具有很高的稳定性和可靠性,能够满足本区域联锁保护系统实时性要求,防止越级跳闸事故发生。

For the problem that communication network for power supply system of underground cannot meet real-time performance and reliability requirements of data transmission,and hardly achieves fast action and selectivity of protection simultaneously,the paper proposed a zone interlocking protection scheme based on switched Ethernet,and used OPNET network simulation software to study real-time performance of the switched Ethernet.The scheme adopts switched Ethernet of tree structure,and composes regional interlock system by adding smart interlock devices with Ethernet communication interface to integrated protection devices.The simulation results show that the maximum delay of overall network is less than 0.65 ms,the maximum end-to-end delay is less than 1 ms,and overall data transceiver flow is relatively smooth in the extreme case of 64 network nodes sending or receiving data at the same time,which illustrate that switched Ethernet has high stability and reliability to meet real-time requirements of interlock protection system in the region and prevent override trip accident.