Mekkanen Mike. On Reliability and Performance Analyses of IEC 61850 for Digital SAS

University of Vaasa. Faculty of Technology. - 2015. - 202 p.During the last years utilities have been facing a strong trend towards new technologies and standard to meet the new requirements of higher energy demands at expected shortage of the nonrenewable sources of energy. One of the most significant tasks is to bring a new solution that supports better quality electricity supply and to support the evolution of the decentralized electric generation towards smart grid approached. Standardized solution (IEC 61850) in terms of automation and protection within energy system is a promising solution that provides a great impact on substation installation, operation and maintenance. Furthermore, it increases the reliability, availability and flexibility of the electric energy grid that linked power generation with power consumption in a dynamic manner. The communication protocols based on the IEC 61850 standard in the substation automation enables a new kind of solutions that provides an efficient performance. This efficiency has been introduced by means of sharing real-time information; reducing life-cycle costs; and providing interoperability, which is identified as one of the main motivations for its use. Serial asynchronous communication and legacy protocols are the existing solutions that being used today in which that needs to refurbish. This work analyzes and evaluates the performance of the relatively new approach IEC 61850 standard within the Substation Automation System (SAS). Furthermore, it defines the existing legacy power system and the needs to specify the efficient way to upgrade, migrate and retrofit the legacy power system. A novel reliability and probability of failure estimation method RaFSA, which may facilitate the energy systems design has been proposed. An intensive simulation approach to demonstrate the proposed techniques have been given. The simulation is a high valuable method that simulates the actual behavior of the real time system upon simulating both the actual process and the system random behavior. To assist this approach and defined the reliability of the IEC 61850 functions.
Several SAS communication bus topologies upon breaker failure protection function (BFP) are tested. They have been shown that ring topology provides the higher reliability and less probability of failure result values. Moreover, designing and construction of the experimental SAS, configurations and interoperability testing between multi-vendor devices. Several SAS practical testing experiments and results thorough DEMVE laboratory are presented and discussed. The achieving results have identified the need for the vender-natural system configuration tool and specified the limits and capacity of the SAS communication system network. High technical and practical experiences have been achieved through the SAS design and configuration processes, several future work issues were identified.