Need for New Islanding Detection Schemes and Prioritization with Generator Grid Code Requirements

摘要

New and forthcoming grid codes increasingly require fault-ride-through capabilities as well as utility grid supporting functionalities from distributed generators. However, these grid code requirements have been made mainly from transmission network stability point of view and less attention has been paid on potential effects on islanding detection and protection of distribution networks. Therefore, conflicts between traditional passive islanding detection methods, like voltage vector shift, and new grid code requirements may potentially exist. In this paper comparison of simultaneous values and behavior of frequency, rate-of-change-of-frequency and voltage vector shift was done by PSCAD simulations taking simultaneously into account generator grid code requirements. Simulation results confirmed that prioritization challenges between traditional passive islanding detection methods and grid code requirements are possible. Therefore, different prioritization possibilities including their benefits or drawbacks are presented at the end of the paper.