An active or reactive power distribution anomaly detection scheme for marine parallel synchronous generators

Abstract

Power distribution anomalies represent major challenges to the reliability of marine synchronous generators (SGs) operating in parallel, particularly due to failures in prime movers and excitation systems. Since most conventional anomaly detection methods rely on centralized structures, communication-independent schemes remain largely unexplored. By analyzing the well-established active power-frequency and reactive power-voltage droop characteristics of SGs, the mechanisms behind active and reactive power distribution anomalies are clarified, and anomaly detection models for marine generators are developed. A new power distribution anomaly detection scheme based on droop characteristics is proposed. The scheme utilizes a distributed structure that depends only on local information for proper operation, with corresponding anomaly warning and protection criteria established. Theoretical analysis and simulation results demonstrate that the proposed scheme effectively detects power distribution anomalies and isolates faulty generators from non-faulty ones. The scheme offers a practical solution to address power distribution anomalies in marine parallel SGs.