Since the permeant magnet synchronous generator (PMSG) has many applications in particular safety-critical applications, enhancing PMSG availability has become essential. An effective tool for enhancing PMSG availability and reliability is continuous monitoring and diagnosis of the machine. Therefore, designing a robust fault diagnosis (FD) and fault tolerant system (FTS) of PMSG is essential for such applications. This paper describes an FD method that monitors online stator winding partial inter-turn faults in PMSGs. The fault appears in the direct and quadrature (dq)-frame equations of the machine. The extended Kalman filter (EKF) and unscented Kalman filter (UKF) were used to detect the percentage and the place of the fault. The proposed techniques have been simulated for different fault scenarios using Matlab®/Simulink®. The results of the EKF estimation responses simulation were validated with the practical implementation results of tests that were performed with a prototype PMSG used in the Arab Academy For Science and Technology (AAST) machine lab. The results showed impressive responses with different operating conditions when exposed to different fault states to prevent the development of complete failure.
The difficulties facing electric utility companies to satisfy on-site customer power demand aroused an increasing interest in small distributed generators (DG). Also the environmental concerns, the technology evolution and the need to integrate renewable energy resources into distribution system gave way to the construction of (DG) using alternative energy sources. The presence of such new generators creates new operating conditions for the interconnected system. The aim of the paper is to study the impacts of faults on stability in systems with (DG) and their satiability during faults. In this paper, the impact of different types of faults at various locations on a distribution system with and without the presence of (DG) is studied. The IEEE 13 node distribution test feeder is used as a model for the study together with synchronous generator (DG). The simulation of the distribution system and the (DG) is performed using PSCAD software. A comparison between fault currents with and without the insertion of the DG is carried. The effect of such faults on the stability of the used DG is considered taking into account the control actions expected for the system to remain within the stability limit. A tuned PID controller is used to enhance the DG transients due to different load changes and faults. The results of simulation are discussed and the scope of the future work is highlighted.
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