Performance evaluation of IEEE 802.16 real time polling and unsolicited grant service scheduling for protecting transmission and sub-transmission systems with multi-terminals

Abstract

One of the major challenges faced by future energy transmission grids is the issue of how to integrate intermittent renewable energy generation. The other problem is how the transmission and sub-transmission systems with multi-terminals are integrated in one grid. Tapping a line is an economical solution to avoid building new stations, but that creates its own operational and protection challenges. The above limitations are future challenges for the protection of modern power systems. In this paper significant emphasis is placed on the communication part, and the theory and benefits of new protection techniques applied to the power systems are clearly indicated. The wireless “WiMAX” based protection “W-Protection” is a new concept for protecting multi-zones as one unit zone using coordination logic. The W-Protection produces new protection solution to properly identify the faulted zone using the wireless networks such as the IEEE 802.16 based WiMAX technology. The IEDs communication traffic requirements and the application models that map them over the real time polling service (rtPS) and unsolicited grant service (UGS) scheduling services of the IEEE 802.16 standard are extensively studied. The communication between IEDs and the Master Protection Center “MPC” using UGS and rtPS-QoS scheduling service available in WiMAX is also discussed. A discrete event model using OPNET simulation package is used for evaluating the performance of rtPS and USG scheduling services in case of latency. The initial results indicated that IEEE 802.16 network can meet the delay requirement of protection applications.