Phase sequence self-adaptive control system and method for three-phase full-control rectifier bridge trigger pulse

Abstract

The invention discloses a phase sequence self-adaptive control system and method for three-phase full-control rectifier bridge thyristor trigger pulses. The method comprises steps: the phase sequenceof a three-phase AC power supply of a rectifier bridge is measured; if a negative sequence exists and is confirmed by a user, trigger pulses outputted by an excitation system are adjusted in real timeaccording to the phase sequence of the AC power supply, and thus, correct output of the three-phase full-control rectifier bridge is ensured, and an AC power supply incoming line does not need to beadjusted. The problem that the excitation system cannot operate normally due to a copper bar design error or a manual wiring error in the debugging and maintenance process can be solved. The control logic of the trigger pulses of the excitation regulator is perfected, the redundant fault-tolerant capability of the excitation system is improved, and the field debugging efficiency is improved 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...

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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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