Islanding Detection in Three-Phase and Single-Phase Systems Using Pulsating High-Frequency Signal Injection

This paper analyzes the use of pulsating high-frequency signal injection for islanding detection purposes. Active islanding detection using high-frequency signal injection is an appealing option due to its reduced nondetection zone, reduced cost, and ease of implementation. The use of a rotating high-frequency signal has been reported and analyzed. However, this method can only be applied to three-phase systems. In this paper, the use of a pulsating high-frequency signal injection is proposed. While it uses the same principles as rotating signal injection, it can be applied to both three-phase and single-phase systems.