| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric power system synchronously paralleling method and a synchronously making device that can expand system making conditions while securing the accuracy of synchronous making and that can parallel systems speedily without missing the timing of synchronous paralleling. SOLUTION: In the electric power system synchronously paralleling method in which a plurality of the electric power systems are synchronously paralleled, a frequency differenceΔf and a phase differenceΔδof power supplies of two systems to be synchronously paralleled are detected. Using the frequency differenceΔf and phase differenceΔδ, a value of energy function: U shown in the figure, where M: unit inertial constant (sec) of a single system,Δω: an angular frequency difference of two systems 2πΔf(rad/sec), X: impedance of a single system (p, u based on system capacity),Δδ: a radian value of the phase difference of the two systems 2πΔθ(°)/360(rad/sec), is calculated. On condition that the value of the energy function: U has come into a preset permissible range, a synchronously inputting command is output to a breaker 3. COPYRIGHT: (C)2005,JPO&NCIPI
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