Research into key points and application ideas of reliability assessment for medium-voltage distribution networks

Abstract

Firstly, some commonly used terms of medium-voltage distribution networks’ reliability assessment are briefly introduced. Then, some normative suggestions about key points of reliability assessment, such as assessment indexes, parameters, and methods, are systematically put forward. In addition, some key issues of models, parameters, and methods for reliability evaluation are analyzed, and corresponding reasonable disposal methods are given. As for distribution network models, the establishingidea is given, where an organic connection is established between the reliability assessment and reliabilitystatistics. Moreover, some ideas of applying reliability assessment in the phases of network planning, renovation, operation, and maintenance are proposed, improving the power supply reliability fundamentally and bringing more benefits for the power supply enterprises. The reliability assessment of 5 cases is conducted, which can test the effects of load switches, load curves, equipment capacity constraint, and load shedding on the reliability indexes, and the results indicate that the presented normative suggestions are practical.