Current sharing control method for parallel intelligent rectifier bridges

A technology of rectifier bridge and flow control, applied in parallel operation of DC power supply, conversion of AC power input to DC power output, DC network circuit device, etc. , to avoid the effect of output pulse asynchronous

Active Publication Date: 2016-07-13
THREE GORGES NENGSHIDA ELECTRIC
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Problems solved by technology

[0007] If the synchronous signal of one phase used by the rectifier bridge fails, it will switch to the normal synchronous signal of another phase, resulting in the rectifier bridge not using a unified synchronous signal, and there will be 1 / 3 or 2 / 3 cycle pulses out of sync

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  • Current sharing control method for parallel intelligent rectifier bridges
  • Current sharing control method for parallel intelligent rectifier bridges

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Embodiment Construction

[0024] The present invention is further described below in conjunction with accompanying drawing and embodiment: the present invention is applied to the current equalization rectification of the three-phase thyristor intelligent rectifier bridge of multi-channel parallel connection, and the system structure is as follows figure 1 As shown, each smart rectifier bridge 1 is connected by a regulator 5 through a communication connector 4 to ensure that the regulator 5 realizes two-way data communication through a communication connector 4, and the smart rectifier bridge 1 is provided with a rectifier bridge controller 2 and a bridge controller Each phase line is provided with a synchronous signal generator 6, which samples and reshapes the AC signal of the corresponding phase, and outputs a process signal of the same polarity as the collected AC phase signal. The zero synchronization signal is output to each rectifier bridge controller 2 .

[0025] During the operation of the syst...

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Abstract

A current sharing control method for parallel intelligent rectifier bridges is disclosed and applied to current sharing and rectification operation for a plurality of parallel three-phase silicon controlled intelligent rectifier bridges. Each intelligent rectifier bridge sends sampling data of a previous power frequency period to an adjusting device after receiving a zero-crossing synchronization signal, the adjusting device sets synchronization period timing after receiving first sampling data, and the synchronization period is limited to be less than one half of a power frequency period; in a set synchronization period, as for all the intelligent rectifier bridges, the adjusting device receives sampling data before replying control data for next power frequency periods corresponding to the intelligent rectifier bridges in a one-by-one manner, and each intelligent rectifier bridge sends sampling data only once in one power frequency period. Via adoption of the current sharing control method output currents of the parallel intelligent rectifier bridges can be equalized in an accurate manner, and a possible problem that various output pulses are not synchronous in parallel intelligent rectifier bridges can be effectively prevented. System operational reliability can be substantially raised.

Description

technical field [0001] The invention relates to electric power supply technology, in particular to a current equalization control method of parallel intelligent rectifier bridges. Background technique [0002] High-power power electronic devices usually need to use multiple thyristor three-phase rectifier bridges to output in parallel, and the trigger pulse is output by the controller, which is output to each rectifier bridge in parallel, and the pulse in the rectifier bridge is amplified to trigger the conduction of the thyristor . Use the synchronous trigger signal to control the conduction angle to trigger the thyristor. Although the anode power supply and the trigger pulse are exactly the same, due to hardware reasons such as inconsistent conduction time of the thyristor, the output current of each rectifier bridge is not balanced. [0003] The communication network mostly uses CAN network, and the trigger angle calculated by the controller is sent to all smart rectifie...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J1/10H02M7/162
CPCH02J1/102H02J2001/104H02M7/1623
Inventor 余翔王瑞清乐绪鑫
Owner THREE GORGES NENGSHIDA ELECTRIC
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