Generator set slow machine halt trouble discrimination method

Abstract

The method for discriminating generator slow shutdown faults includes satisfying the following three criteria simultaneously: (1) the slow start element uses the power drop rate as the slow start condition to record the power value of the unit during steady-state operation, and the unit The power drop rate exceeds the threshold value of the power drop rate; (2) The slow stop power drop condition, when the slow start condition is met, compare the unit power value at each point with Pjz_00, if the drop is greater than the set value within the given time ΔTset ΔPset, after continuous multi-point confirmation, it is judged that the unit is slow to shut down due to non-electrical failure; (3) Auxiliary criterion of frequency and voltage: use frequency variation or voltage variation, that is, Δf≥SETΔf or ΔU≥SETΔU, as the judgment unit slow shutdown auxiliary criterion.

Description

1. Technical field [0001] The invention relates to a method for judging generator non-electrical failure shutdown, that is, a method for discriminating generator slow shutdown, capable of judging the generator slow shutdown failure caused by abnormalities in the prime mover system and the like. 2. Background technology [0002] For large-scale and small-grid power systems (Hainan, Xinjiang, Tibet, etc.) or power grids in small-capacity areas, if there is an emergency shutdown of a high-power unit inside or a large power drop in a short period of time, the frequency of the regional power grid may be caused. Or the voltage drops seriously, and it is necessary to quickly remove a certain capacity of regional loads to restore the system frequency or voltage to normal as soon as possible, so as to avoid frequency or voltage instability in the regional power grid. Therefore, it is very important to correctly and quickly judge the emergency shutdown and rapid power drop of these un...

AI Technical Summary

Problems solved by technology

At present, the electrical quantity criterion for judging short-circuit faults of generators is relatively mature, and such faults can be quickly judged; The time is usually between 0.3 seconds and 0.5 seconds), due to the slow change process of electrical quantities, it is impossible to judge according to the usual characteristics of electrical quantity changes. At present, there is no accurate identification method for unit failures in this case

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