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This paper present a numerical method for calculation of current and voltage symmetrical components in case of multiple simultaneous asymmetrical stationary power system faults. The proposed method first decomposes the complex fault into different sets of sequence networks. Each set represents one fault with interconnections of sequence networks and other faults with controlled current or electromotive...
Most of the distance relays base their operation on the measured apparent fault impedance. These relays are bound to have an error inflicted by the unknown remote end parameters and fault resistance. This paper presents a method, which diminishes such errors using optimization techniques. The proposed method executes a system model unknown parameter estimation by adjusting model output to measurements...
This paper presents a method for fault location in transmission lines, which uses measurements from one substation during pre-fault and fault regimes to estimate unknown parameters of a wider power system model with an optimization algorithm. The optimization algorithm diminishes the difference between measurements and a power system numerical model output. This method incorporates random search within...
Changes in a power system's network structure, technological advance and high loading conditions as a result of the energy market demand are reasons for further power system stability analysis. Research on new types of system stability as well as better methods for an evaluation of classic problems are ever more relevant. Providing the dispatcher with a tool for a quick evaluation of system stability...
This paper presents the development of micro-processor based device for improving the sensitivity of differential protection of power transformers. Power transformers failure may lead to high scale system's operations disruption and heavy economic losses, that's why the lever of requirements for power transformer protections is so high. Differential protection is usually used as a main protection...
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