converter lhc20 5ka 18v

Posted on Feb 5, 2014

It is located in the LHC underground installation, close to the loads to limit cable losses in the underground installation. A high current switch mode power converter, designed for powering of superconducting loads requiring only positive current and positive voltage control (1 quadrant). The converter is constructed from a modular architecture

converter lhc20 5ka 18v
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composed of 3. 25kA power modules. The converter is water cooled, and is thus ideally suited to situations where air losses must be carefully managed. Designed for underground operation, extensive remote diagnostics have been foreseen to allow efficient monitoring and fault diagnostics without requiring being present locally. Power Converter is normally assembled using a n+1 Power Bricks [+3. 25kA +18V] to provide active redundancy in case of one subconverter is lost. [+20. 5kA +18V] Power Converter is composed of 8x [+3. 25kA +18V] Power Brick, working as current source being controlled by a Voltage Source main control. Power Brick is actually a high frequency current source (7-8kHz) controlled by a 1kHz bandwidth voltage loop. One can notice that Power Brick is actually a current cource in its structure, even if voltage source capacitors are located in this block for mechanical reasons. Representation below gives a symbolic structure of the power converter, clarifying the cascade loops. High precision current control loop is managed by the digital controller called FGC (Function Generator Controller). This unit includes a high precision Sigma Delta Analog to Digital Converter which digitalize the analog current measurement coming from 2 DCCTs (DC current Transducer). Precision is then directly relying on sensor precision: DCCT, the ADCs, and the algorithm being used for the regulation loop. Voltage source is then used as...

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