A Current Sharing Method Combining Preset Bias Angle and Shared Synchronization Signal

Abstract

The present invention provides a current sharing method that combines a preset bias angle with a shared synchronization signal. Each intelligent rectifier bridge determines its own synchronization bias angle through a small current test; it shares local data with all parallel intelligent rectifier bridges through a communication network. The accessed synchronization signal and synchronization offset angle; when using the synchronization signal of other intelligent rectifier bridges as the driving signal of the trigger pulse, the synchronization offset angle of the intelligent rectifier bridge where the synchronization signal source is located is used as the synchronization offset angle of the trigger pulse; Each smart rectifier bridge adjusts its own current-sharing bias angle through high-current tests to obtain the current-sharing bias angles of all smart rectifier bridges; each smart rectifier bridge improves the performance of each smart rectifier bridge under typical operating conditions by superimposing the current-sharing bias angle. Current sharing characteristics under. The present invention ensures the consistency of the synchronization signals of each intelligent rectifier bridge by sharing synchronization signals and synchronization bias angles, and then improves the current sharing characteristics of each intelligent rectifier bridge under typical working conditions by superimposing fixed current-sharing bias angles.

Description

technical field [0001] The invention relates to the field of high-power electric electronics, in particular to a current sharing method combining a preset bias angle with a shared synchronous signal. Background technique [0002] High-power power electronic devices usually need to use multiple thyristor three-phase rectifier bridges to output in parallel. Smart rectifier bridge solutions such as figure 1 As shown, the controller outputs the trigger angle to the smart rectifier bridge through the communication network, and the smart rectifier bridge controller generates a control pulse to trigger the rectifier bridge according to the synchronization signal and the trigger angle, and converts the three-phase AC power supply on the anode side into a DC power supply. [0003] Due to hardware differences in many aspects such as the conduction characteristics of the thyristor and the internal resistance of the bridge arm of the smart rectifier bridge, the output currents of the sm...

AI Technical Summary

Problems solved by technology

[0009] But this scheme does not take into account the differences in hardware

Although each smart rectifier bridge uses the same synchronous shaping circuit, due to the dispersion of component parameters, the phase deviation that each smart rectifier bridge needs to compensate is still slightly different, and this difference must be compensated in the current sharing control

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