Phase modifier excitation loss protection method and device and electronic equipment

Abstract

The invention discloses a phase modifier excitation loss protection method and device based on a break variable criterion. The method is characterized by comprising the following steps of collecting stator voltage and current of the phase modifier and rotor voltage, calculating stator voltage, reactive power, rotor voltage value and break variable amount of the phase modifier, according to the stator voltage, the reactive power value, the rotor voltage and the amplitude and the direction of the variation of the phase modifier, comprehensively judging an excitation loss fault of the phase modifier, and performing alarm or tripping after short-time delay protection, thereby improving the protection sensitivity of the excitation loss fault of the phase modifier and the reliability under otherabnormal operation or faults.

Description

technical field [0001] The present application relates to the field of relay protection, and in particular to a method for protecting a condenser from demagnetization faults, a protection device and electronic equipment. Background technique [0002] The synchronous condenser has a large reactive power compensation capacity. When the grid voltage drops, the excitation system of the condenser can automatically adjust and implement forced excitation, and continuously provide reactive power to the system, especially for improving the UHV AC-DC hybrid grid. Voltage stability and dynamic reactive power support capability are of great significance. Since the large synchronous condenser has no prime mover, it emits or absorbs reactive power and has no active power output during normal operation, which is very different from the operation mode of the conventional generator. It is difficult to apply the demagnetization protection of the conventional generator to the large synchronous...

AI Technical Summary

Problems solved by technology

Because there is no prime mover in the large synchronous condenser, it emits or absorbs reactive power and has no active power output during normal operation, which is quite different from the operation mode of conventional generators. It is difficult to apply the loss of field protection of conventional generators in large synchronous condensers.

The existing demagnetization protection of condensers mostly uses steady-state voltage, reactive power and other criteria, and the setting value is relatively high, but the sensitivity is low. It is necessary to study new demagnetization protection criteria to further improve the demagnetization fault detection sensitivity. , and prevents misoperation during abnormal operation or fault conditions

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