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3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012

3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012. Constant current oscillations AC load. Number of Power supplies Pictures of power parts. PETRAIII Extension digital. regulation. Niels Heidbrook DESY.

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3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012

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  1. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 • Constant current oscillations • AC load • Number of Power supplies • Pictures of power parts PETRAIII Extension digital regulation Niels Heidbrook DESY

  2. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Petra III 2,3km length

  3. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 556 power supplies 252 choppers 292 correctors Petra III Extension 309 choppers 334 correctors old 655 power supplies Petra III Extension

  4. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 334 Correctors

  5. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 91 Bipolar Choppers 55A

  6. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 132 Choppers 200A

  7. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 20 Choppers 2*400A

  8. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 66 Choppers 600A

  9. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 8 Thyristor 500V/500A

  10. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Web page Control system Scope Service box 1ADC/6DAC/6digital I/O Touchscreen display Ethernet PSC Power part • FPGA 1 • Current Measurement • I-Regulator • Communication • Internet Chip • Communication • Online scope • Mail • FPGA 2 • Voltage Measurement • U-Regulator • Power part steering and protection • Main contactor steering • Ground resistance measurement • Dump survey Fiber optics SD card DCCT 1&2 CAN BUS Touchscreen display with scope • Polarity changer • Fan steering Temperature measurement USB, COM 1&2, CAN BUS

  11. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Constant current oscillations constant current => constant power Rectifier filter Iintermediate ~ Power supplies Iload Mains Uintermediate =

  12. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Constant current oscillations Rectifier filter Iintermediate ~ Constant power loads Mains Uintermediate = Uintermediate Iintermediate I0=2A U1=10V P ∆U 10V-5V -5V = -5Ω = = ∆R= I1=1A ∆I 2A-1A 1A U0=5V P=10W t

  13. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Constant current oscillations power supplies rectifier filter constant power 5KW IR2 IR2

  14. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Constant current oscillations power supplies rectifier filter constant power 55KW IR2 IR2 ~350Aeff

  15. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Constant current oscillations power supplies rectifier filter constant power 55KW IR2 damping IR2

  16. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Constant current oscillations constant current => constant power Rectifier filter Iintermediate ~ Power supplies Iload Mains Uintermediate = damping Conclusion: Extension => check damping

  17. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Constant current oscillations filter Rectifier filter Iintermediate L ~ Power supplies Iload Mains Uintermediate Uload Lload C = L, C, Lload => system order is 3 Uload, Iload => 2 values for regulation • Regulation is under-determined for full pole setting • Ringing problems => less regulation quality

  18. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 Constant current oscillations Resistance of a self-repairing (POLYSWITCH) fuse filter Rectifier filter Iintermediate L ~ Power supplies Iload Mains Uintermediate Lload C = damping damping Stability at high current, Improved regulation quality

  19. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 AC load ISCR ~ constant filter U1 Iload L SCR bridge 12 pulse Power supply USCR f0=600Hz U2 C U3

  20. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 AC load (Iload Delta-Sigma ADC delay = 1ms) Iload L Power supply U=4Vpp f0=600Hz ~ C delay

  21. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 AC load filter Iload L U=4Vpp f0=600Hz reaction ~ ~ C delay

  22. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 AC load filter Iload L U=4Vpp f0=600Hz U=4Vpp f0=600Hz pre-action ~ ~ C action pre-delay

  23. 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 AC load 600Hz @ 4Vpp => High internal filter current Iload Power supply = Frequency generator U=4Vpp f0=600Hz U=4Vpp f0=600Hz ~ ~

  24. Conclusion 3rd Workshop on Power Converters for Particle Accelerators (POCPA)2012 About 3.5 Years experience556 new designed power supplies in operation 655 power supplies including the Extension The MTBF is satisfying, i.e. limited by: Auxiliary power supplies fail sometimes 12V/4A (1.2A load) There are still some software bugs Overcurrent after cycling of the magnets caused by the old learning function

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