Oscillation suppression and current sharing control method for a 24-pulse phase-controlled rectifier power supply

Abstract

The invention discloses an oscillation suppression and current sharing control method of a 24-pulse wave phase-controlled rectifier power supply. Firstly, four sets of 6-pulse wave rectifier power supplies are centrally processed and time-sharing controlled, and secondly, intelligent band sampling technology and intelligent time-sharing PID control are adopted. technology, time-staggered PID control technology and multi-level PID control technology, the method of centralized processing of the four 6-pulse rectifier power supplies is as follows: given by the upper computer to the given receiving management unit; the feedback and summary of the four rectifier cabinets The feedback information is connected to the sampling management unit, and the sampling management unit centrally manages the sampling; the receiving management unit sends the given to the general adjustment PID unit, and the general adjustment PID unit adjusts according to the overall feedback, and the overall adjustment results are sent to the stand-alone working condition distribution The management unit; the single machine working condition allocation management unit uniformly dispatches and allocates the value that each rectifier cabinet should output according to the working conditions of each single machine. The oscillation suppression and current equalization control method of the 24-pulse phase-controlled rectifier power supply of the present invention avoids the occurrence of oscillation and uneven current.

Description

technical field [0001] The invention relates to a control method, in particular to an oscillation suppression and current sharing control method of a 24-pulse phase-controlled rectification power supply. Background technique [0002] The main circuit structure of the 24-pulse phase-controlled rectification power supply uses a rectifier transformer, or several transformers equivalent to it. The grid side of the rectifier transformer is in the same phase, but the difference between adjacent valve sides is 15 degrees. Each valve side of the rectifier transformer and a 6-pulse rectifier cabinet form an independent rectifier power supply, which is connected in parallel at the load end. Each rectifier power supply is independent It is controlled by a 6-pulse control system, and then the four 6-pulse control systems are managed by a monitoring PLC. Since the four 6-pulse control systems are not interconnected, they do not know the working conditions of each other, and the monitori...

AI Technical Summary

Problems solved by technology

Since the load is one, the four power supply modules affect each other and cannot output at the same voltage and current at the same time, which will cause one of the module power supplies to be adjusted when the other three module power supplies are adjusted accordingly. The adjustment of the first power supply causes the adjustment of the first power supply, such a vicious circle, which causes oscillation

[0003] Slight vibration will cause the current and voltage at both ends of the load to be unstable, affecting the electroplating effect or the smooth operation of the locomotive. If the vibration amplitude is too large, it will burn out the load and the power supply itself, and cause damage to the power supply line and cause serious accidents.

[0004] In order to suppress the oscillation, there is a way to use only one power supply for regulation, and the other power supplies only follow and do not make adjustments. This will cause the output imbalance between the four power supplies, resulting in uneven current, and some power supplies are overloaded for a long time. , while other power supplies hardly work, which may not meet the total output requirements on the one hand, and seriously affect the service life of the power supply on the other hand

Images