Research And Verification Of Setting Value Coordination Method Considering The Responding Deviation Of Under Excitation Limit And Loss Of Excitation Protection For Generator

The general principle of the matching between the under excitation limit and the loss of excitation protection has been extensively described, which mostly concentrated on the theory and method of converting them to the same power plane or impedance plane for verifying, but there is little literature of considering the influence of the action characteristics of the field device to the matching results for the setting value. In theory, the influence of parameter variation to the matching result is analyzed in detail. This paper proposed the matching testify principle based on the application operation deviation and expounds the adjustment method of setting value mismatch, which provides an effective guidance principle for power plants with verification and cooperation of under excitation limit and loss of excitation protection.