학술논문
A Coordinated Multi-Element Current Differential Protection Scheme for Active Distribution Systems
Document Type
Periodical
Source
IEEE Transactions on Power Delivery IEEE Trans. Power Delivery Power Delivery, IEEE Transactions on. 37(5):4261-4271 Oct, 2022
Subject
Language
ISSN
0885-8977
1937-4208
1937-4208
Abstract
This paper introduces a current differential protection scheme, appropriate for application in medium voltage active distribution systems, where it is desired to keep the greatest possible number of loads and DG units energized during a fault. Conventional two-terminal percentage current differential relays are used to form successive, time-current-coordinated, differential protection zones. Multiple time-delayed differential elements in each protection zone guarantee coordination with the zone's lateral protection devices, as well as between successive differential protection zones. Sensitive time-delayed differential elements protect against relatively high-resistance faults, while instantaneous differential elements minimize protection speed whenever possible. Additional emergency differential elements deal with post-fault topology changes and breaker failure conditions enhancing the overall scheme's performance. The proposed scheme is applied to a model of real medium voltage distribution system with distributed generation, considering a ring topology operation. A detailed simulation-based study proves the applicability and enhanced performance of the proposed scheme.