Abstract
An oscillation blocking and re-opening scheme for distance protection in multisource oscillation scenes is proposed in this paper. First, the expression of measured impedance in multisource oscillation scenes is derived and the variation characteristic of the trajectory of measured impedance is analyzed. Then, according to the correlation between the measured impedance and the position of desynchronizing center, the desynchronizing center position factor (DCPF) is defined, and protection blocking and re-opening criterion based on DCPF is constructed. Real Time Digital Simulator test results demonstrate that the proposed scheme can effectively block the protection during oscillation even when fault occurs at the same time as the desynchronizing center appears, and re-open the protection quickly when a fault occurs.
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