Abstract
Modern fault location methods are robust; however, they depend strongly on the availability of the measurements given by Distributed Energy Resources (DER). If the communication or synchronism of this information is lost, the fault location is not possible. This paper proposes an adaptive impedance-based fault location algorithm for active distribution systems. The proposal combines information provided by Intelligent Electronic Devices (IEDs) located at the substation, the knowledge of the network topology and parameters, as well as the distributed power sources, to estimate the fault location. Its adaptive feature is given by the use of a Distributed Energy Resources (DER) electrical model. This model is used to estimate the DER current contribution to the fault, in case the information provided by a local IED is not available. The method takes two types of DER technologies into account: Inverter non-interfaced DER (INIDER) and Inverter-interfaced DER (IIDER). The proposed method is validated on a modified IEEE 34-node test feeder, which was simulated with ATP/EMTP. The results obtained using the IEDs information, presented a maximum error of 0.8%. When this information is not available, the method’s performance decreases slightly, obtaining a maximum error of 1.1%. The proposed method showed better performance when compared with two state of the art methods, indicating potential use for real-life applications.
Highlights
Fault location (FL) is one of the most important tasks in the supervision and management of electrical networks with self-healing features
The methods exposed in the literature [18,19,20,21,22,23,24] are formulated using synchronized current and voltage phasors, provided by Intelligent Electronic Devices (IED), in order to consider the Distributed Energy Resources (DER) effect on the FL. These methods are robust, but depend strongly on the availability of measurements given by IED, which are installed in DER
It combines the information provided by IEDs, located at the substation, and the DER to estimate the FL
Summary
Fault location (FL) is one of the most important tasks in the supervision and management of electrical networks with self-healing features. The methods exposed in the literature [18,19,20,21,22,23,24] are formulated using synchronized current and voltage phasors, provided by Intelligent Electronic Devices (IED), in order to consider the DER effect on the FL. These methods are robust, but depend strongly on the availability of measurements given by IED, which are installed in DER. Considering such, the main contribution of this work is the development of an adaptive impedance-based FL algorithm for active distribution networks It combines the information provided by IEDs, located at the substation, and the DER to estimate the FL.
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