Synchronous phase modifier rotor winding weak turn-to-turn short circuit fault diagnosis method

Abstract

The invention provides a synchronous phase modifier rotor winding weak turn-to-turn short circuit fault diagnosis method, which comprises the following steps: acquiring air gap flux density, rotor amplitude and stator amplitude of a synchronous phase modifier in real time, and selecting the air gap flux density, the rotor amplitude and the stator amplitude of the synchronous phase modifier before and after a fault as evidence bodies; calculating basic trust distribution functions of the three evidence bodies before and after the fault, fusing the three trust distribution functions by adopting an evidence fusion rule, calculating a fault trust distribution value, comparing the fault trust distribution value with a fault judgment threshold value, if the fault trust distribution value is greater than the fault judgment threshold value, judging that the fault exists, and otherwise, judging that the fault exists; and constructing a field-circuit-network coupling simulation model of high-voltage direct-current power transmission containing the synchronous phase modifier, and performing simulation verification. According to the synchronous phase modifier rotor winding weak turn-to-turn short circuit fault diagnosis method, the problem that the existing weak turn-to-turn short circuit fault diagnosis technology of the synchronous phase modifier is insufficient can be solved, and the detection precision of the turn-to-turn short circuit fault of the rotor winding of the synchronous phase modifier is improved.

Description

technical field [0001] The invention relates to the technical field of condensers, in particular to a method for diagnosing weak inter-turn short circuit faults of rotor windings of synchronous condensers. Background technique [0002] In recent years, with the rapid development of HVDC power transmission, the safe and stable operation of large synchronous condensers has become increasingly important. The safe and stable operation of the condenser is of great significance to improve the power quality of the grid and maintain the stability of the grid voltage. [0003] Synchronous condensers are large-scale rotating equipment, and they are also faced with the fault of inter-turn short circuit of the rotor winding. The severity of the early fault is not high, and it is common for the unit to run with a disease. The unit running with a disease will distort the air gap magnetic field of the synchronous condenser, and the asymmetrically distributed magnetic field will generate a...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a synchronous condenser rotor winding weak inter-turn short-circuit fault diagnosis method, which has strong real-time performance and fast discrimination speed, and can solve the problem of insufficient weak inter-turn short-circuit fault diagnosis technology for synchronous condensers, and improves the synchronous Detection Accuracy of Turn-to-Turn Short Circuit Fault of Condenser Rotor Winding

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