Method and controller for judging phase sequence of synchronizing signal in main circuit of converter
A technology for synchronous signal and phase sequence judgment, which is applied in the field of converters and can solve problems such as no implementation scheme for synchronous signal phase sequence judgment
Active Publication Date: 2015-02-25
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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[0004] The technical problem to be solved by the present invention is to realize the judgment of the phase sequence of the synchronous signal, and provide a method for judging the phase sequence of the synchronous signal in the main circuit of the converter and a controller to solve the technical problem that there is no implementation scheme for judging the phase sequence of the synchronous signal in the prior art , so as to protect the converter and avoid damage to the converter
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[0044] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0045] refer to figure 1 As shown, it is a schematic structural diagram of a typical converter main circuit applicable to the present invention, wherein the main circuit of the converter is mainly composed of a traction transformer, a traction converter and a digital controller, and the traction converter includes a grid side Converter. The tra...
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The invention discloses a method for judging the phase sequence of a synchronizing signal in the main circuit of a converter. The method comprises the following steps of: sampling the synchronizing signal in the main circuit of the converter and a present converter input current; within a preset time, obtaining a plurality of synchronizing signal sampling values and present converter input current sampling values corresponding to same sampling time; generating judgment parameters according to the synchronizing signal sampling values and the present converter input current sampling values; and judging whether the phase sequence of the synchronizing signals is correct according to the judgment parameters. Correspondingly, the invention further discloses a controller. The technical problem that a realizing scheme for judging the phase sequence of the synchronizing signal is absent from the prior art is solved, phase sequence errors of the synchronizing signal can be corrected in time, and the damage to the converter due to the overlarge input current of the converter is avoided.
Description
technical field [0001] The invention relates to converter technology, in particular to a method for judging the phase sequence of a synchronous signal in a main circuit of the converter and a controller. Background technique [0002] At present, most of the high-power PWM (Pulse Width Modulation, pulse width modulation) grid-side converters adopt digital control, and the synchronization signal is an important analog input used to realize the digital control of the grid-side converter. In industrial design , The synchronous signal is transformed into a low-voltage control signal through multi-stage high-voltage transformers and synchronous transformers for digital control. After the synchronization signal undergoes multi-level conversion, the phase of the synchronization signal is easily reversed due to a group of wiring errors during the multi-level conversion. At this time, starting the grid-side converter may cause the input of the grid-side converter Current overcurrent ...
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IPC IPC(8): G01R29/18G05B19/04
Inventor 章志兵张志学
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST