Métodos de Bloqueio por Oscilações de Potência: Uma Análise em Linhas de Transmissão de Três Terminais
Keywords: Three-Terminal Lines, Power Swing, Distance Relay
AbstractThe disturbances resulting from Power Swing (PS) cause, in a harmful way to the electrical power system (SEP), acceleration or delay in the rotor angle between synchronous generators in relation to the synchronous frequency. In this way, in order to inhibit undue occurrences of the distance protection (ANSI 21 function), the detection of the PS phenomenon, as well as the action, is corroborated through the blocking (ANSI 68 function). Three-terminal transmission lines are a cost-saving option as there is a reduction in the cost of building the line. However, the complexity and challenge of line protection increases, especially with regard to the distance relay. Thus, this work aims to analyze the performance of three methods, established for two-terminal lines, when applied in a system with three-terminal lines. The algorithms Concentric Characteristics Method, Double Blinder Method and Electric Center Voltage Variation Method were implemented. The obtained results show that the MVTCE presents better performance among the evaluated methods.