Analysis on the Reliability of Wide Area Protection Communication System

Abstract

This paper analyzes characteristics of the wide area protect communication system structure, and divides communication systems into the system protection center, backbone network, and regional communications systems. And regional communication system is divided into regional protection centers, regional networks and sub-station system. Then This paper analyzes the reliability of the fiber optic ring network which is used widely, and establishes the reliability model of each subsystem. As IEEEl4 bus for example, we calculate the reliability of each subsystems and overall system, then we get the sub-station is a bottleneck affecting the reliability of the entire communication system. But in wide area network, ATM switches are weakest link components. We use Bayesian network as reliability evaluation method. The reliability evaluation method of Bayesian network not only can be easily used to calculate the reliability, but also can find the thin section of system by its unique reverse reasoning technique. High-reliability Wide-area protection communication system is an important part of wide area protection system for its correct and reliable operation.A is the availability of the optical fiber between the ATM switch and the server. Similarly, we can get the reliability model of the system protection center and availability. B. reliability model for LAN and backbone networkWide area protection communication system is divided into two Layers network which consisted of the LAN and the backbone network. This network structure can not only realize free communication between the system protection and the regional protection centers and sub-station and the regional protection of communication, but also it can limit area protection communication system to the local scope to avoid the congestion of the backbone. LAN can be star or ring network, and the backbone network communication network uses the structure of the ring network. Now the backbone of communication network in Power system uses SDH ring network as the main network. For example the backbone communications network in Southern Power Grid is a typical ring network structure [9]. The common mode of SDH ring network is two-fiber unidirectional path ring, two-fiber unidirectional multiplex section-channel ring or four-fiber bidirectional multiplex section-channel ring network [10]. In this article, we use the two-fiber unidirectional path ring for reliability analysis and reliability model. 0.8291 3271 0.9997 2079Considering the reliability of the sub-station have great impact on the reliability of the entire wide area protection communication system. Assuming availability of sub-station communication system is 1, and the wide area protection communication system corresponds to the wide area communication system, the availability of the communication system such as shown in table 3.

A reliability‐based construction approach for wide‐area backup protection systems utilizing phasor measurement units in smart grids

“…In a PMU‐based WABP system, the reliable operation of the wide‐area protection system depends on the proper functioning of PMUs [17]. When a critical communication component or PMU fails, it can cause the entire wide‐area protection system to become inactive, resulting in the loss of control over the entire power grid [18].…”

A Reliability-Based Construction Approach for Wide-Area Backup Protection Systems Utilizing Phasor Measurement Units in Smart Grids

“…In a PMU-based WABP system, the reliable operation of the wide-area protection system depends on the proper functioning of PMUs 13 . When a critical communication component or PMU fails, it can cause the entire wide-area protection system to become inactive, resulting in the loss of control over the entire power grid 14 .…”