Stochastic latency assessment in substation automation systems

Abstract

This paper deals with stochastic latency in modern substation automation systems based on IEC61850. In order to meet the real-time requirements of mission-critical protection functions, latency evaluations are necessary to assess the expected performance level. A thoroughly-analyzed system under various contingencies ascertains that the communications design architecture is sufficiently fast and reliable. The presented methodology is demonstrated via a case study related to antiislanding protection of a power plant. The base case latency and stochastic latency were calculated and compared. This investigation reveals that a failure in the communications network can compromise the performance of the protection function without proper mitigation strategies such as utilizing devices with higher reliability, considering redundant parts, equipping network devices with monitoring and indication systems, and deploying GOOSE as opposed to ARQ.

Study of Anti-Nonextension-Entropy Weight Application in Microgrid Evaluation

“…The microgrid can not only solve the problem of large -scale DG integration on power system, give full play to the advantages of DG, but also bring the benefits in many ways for the user [1,2] , so scientific research and engineering practices for microgrid have been made during recent years. In order to grasp microgrid construction and development in the different regions, power grid managers need to make a proper evaluation based on the microgrid evaluation index, sum up the advanced experience of microgrid construction and encourage excellent microgrid development, which has important significance for the future development of the microgrid.…”