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Abstract
This paper presents a method to identify power system impedance in real-time using signals obtained from grid connected power electronic converters. The proposed impedance estimation has potential applications in Fuel cell/distributed energy systems, STATCOM, and solid state substations. The design of STATCOM parameters are considered an optimization problem according to the time domain-based objective function solved by a fuzzy controller that has a strong ability to find the most optimistic results associated with small disturbances imposed by power converters and determine the net impedance back to the source. A data capture period of 5 ms is applied to an accurate impedance estimation which provides the possibility of ultra fast fault detection The paper describes how the proposed method would enhance the distributed generation operation during faults