1 / 11

DC Superconducting Transformer Control System LBNL Superconducting Magnet Group Arno Godeke

DC Superconducting Transformer Control System LBNL Superconducting Magnet Group Arno Godeke October 1, 2007. Bill Of Materials(?). Measurement and control: One or two Cu Rogowski’s 4 ordered commercially 24 bit AD/DA Input Rogowski signal Output primary control voltage

bandele
Download Presentation

DC Superconducting Transformer Control System LBNL Superconducting Magnet Group Arno Godeke

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. DC Superconducting Transformer Control System LBNLSuperconducting Magnet Group Arno Godeke October 1, 2007 A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  2. Bill Of Materials(?) • Measurement and control: • One or two Cu Rogowski’s • 4 ordered commercially • 24 bit AD/DA • Input Rogowski signal • Output primary control voltage • (Perfect) digital integrator • Control software • Hardware • Bipolar PS: 20 V / 100 A, voltage controllable • 1000 turn 100 A primary • 1.5 turn, 50 kA secondary • Mechanical support structures (F=BxI: 15T, 50 kA…) • Main loads are Torque in bifilar cable samples A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  3. Transformer Control Schematic PS errors Uset U/I RPShunt RP A1 ++ +- A3 LP -+ MPS MPR A2  LS -+ LROG ++ Usec MSR INT errors RSam1 RSam2 --- = main --- = errors --- = correction LSAM2 LSAM1 RSam1-2 UP IP UI UR IS 1) UP = IP(RPShunt + RP) + LPdIP/dt - MPSdIS/dt 2) MPSdIP/dt = (RSAM1 + RSAM2 + RSAM1-2)IS + (LS + LSAM1 + LSAM2)dIS/dt 3) UR = - MSR dIS/dt  UI = - MSR + C A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  4. Target block diagram ErrorPS PS + Isec Uset + + H1 H2 - + H4 H3 + ErrorINT Isec / Uset=H1H2 / (1 + H1H2H3H4) Isec / ErrorPS=H2 / (1 + H1H2H3H4) Isec / ErrorINT=H4H1H2 / (1 + H1H2H3H4) A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  5. Main system +- UP Uset U/I A1 RP IP LP UI UR MPS -A2  LS LROG IS Usec MSR RSam1 RSam2 LSAM2 LSAM1 RSam1-2 A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  6. Transfer function • Laplace transformation: Is UP IP Uset + + A1 - - A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  7. Transformer and feedback HT UP Uset Is + A1 - A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  8. S-space to frequency space: s  j, HSystem = a + jb |HSystem| = Amplitude spectrum Arg(HSystem) = Phase spectrum Stability: Above 180 degree phase shift |HSystem| < 1 S-domain to frequency spectrum A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  9. Overall transfer function (error sources pending) Frequency spectrum Isec/Uset A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  10. ‘Typical’ VI measurement on a cable At ~0.05 m ~ 2.5 microV A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

  11. VI with current ramp DC VI measurement Measurement procedure Set Isec = 0 Set Isec = 0 Measure: Isec Vsample Measure: Isec Vsample Write data Write data Isec = Isec + a dIsec/dt Set Isec = Isec + Istep Measure: Isec Vsample N Sec. quench? Sec. quench? Y Set Isec = 0 Write data Write VI dataaround Iquench Write VI dataaround Iquench Wait t1 A. Godeke – October 1, 2007 DC Superconducting Transformer Control System

More Related