ANALYSIS AND DATA PROCESSING SYSTEMS

The paper considers the out-of-step detection setting principles in open-phase operating conditions. Out-of-step operation may occur in the power system under open-phase or deep symmetry conditions. Since open-phase out-of-step operation is not a rare event, the existing emergency control standards require out-of-step detection and elimination under these conditions. Out-of-step detection in non-symmetric conditions has traditionally been attributed to an additional algorithm of out-of-step protection (OSP). This algorithm has a sufficiently low selectivity and efficiency. Modern requirements to the out-of-step protection algorithm for eliminating an asynchronous run in asymmetric conditions do not imply the use of an additional algorithm. In this connection, the development of algorithms for adapting the out-of-step protection algorithm in open-phase operating conditions is urgent as well as the development of the out-of-step protection parameterization method for the open-phase mode. The paper presents a positive-sequence impedance change under out-of-step open-phase mode conditions for a simple two-machine system. Algorithms revealing transition from symmetric to non-symmetric modes and permitting the operation of the unit with a group of setting of open-phase operating conditions are proposed. An example of OSP sets in a complex multi-machine system that allows operating of both completely symmetric out-of-step conditions and of open-phase out-of-step conditions is given. As a scheme for analyzing regularities of changing positive-sequence impedance and choosing setting parameters in open-phase out-of-step conditions, a test multi-machine test system whose parameters and configuration are given in the standard [1] was chosen. Out-of-step protection principles and algorithms for open-phase operating conditions are proposed.

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