Phase sequence adaptive control system and method for trigger pulse of three-phase fully-controlled rectifier bridge

Abstract

The invention discloses a phase sequence adaptive control system and method for a three-phase full-control rectifier bridge thyristor trigger pulse, which includes: measuring the phase sequence of the three-phase AC power supply of the rectifier bridge, and if there is a negative sequence and confirmed by the user, The trigger pulse output by the excitation system is adjusted in real time according to the phase sequence of the AC power supply, thereby ensuring the correct output of the three-phase fully-controlled rectifier bridge without adjusting the incoming line of the AC power supply. The invention can solve the problem that the excitation system cannot operate normally due to the wrong copper bar design or human wiring error during the debugging and maintenance process. The invention perfects the control logic of the trigger pulse of the excitation regulator, improves the redundant fault tolerance capability of the excitation system, and improves the on-site debugging efficiency by reducing the workload.

Description

technical field [0001] The invention provides a phase sequence adaptive control system and method for triggering pulses of a three-phase full-control rectifier bridge, belonging to the technical field of generator excitation control. Background technique [0002] The rectifier cabinet composed of a three-phase fully-controlled rectifier bridge is an important part of the generator excitation system. It rectifies the AC power into DC and sends it to the generator rotor winding to provide a stable magnetic field. As a controllable power supply circuit, trigger pulse control is the core technical part of the three-phase fully-controlled rectifier bridge, which requires a three-phase synchronous transformer to provide a synchronous signal as a reference signal for the trigger angle. For three-phase AC power supply, the phase of positive sequence power supply is that phase B lags phase A by 120°, and phase C lags phase B by 120°. If the connection mode of the three-phase input t...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a phase sequence adaptive control method of the trigger pulse of a three-phase fully-controlled rectifier bridge. By measuring and judging the synchronous phase sequence, the phase sequence adaptive control of the trigger pulse can be realized, the constraint of the phase sequence can be overcome, and the debugging can be solved. During the maintenance process, the excitation system cannot operate normally due to copper bar design errors or human wiring errors

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