1. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 PETRAIII Extension digital regulation Constant current oscillations AC load Number of Power supplies Pictures of power parts 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 252 choppers 556 power supplies 292 correctors 309 choppers334 correctors Petra III Extension 655 power supplies old 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 SD card USB, COM 1&2, CAN BUS DCCT 1&2 Polarity changer Fan steering CAN BUS Temperature measurement Touchscreen display with scope FPGA 1 Current Measurement I-Regulator Communication Internet Chip Communication Online scope Mail Power part Ethernet PSC Control system Web pageScopeService box 1ADC/6DAC/6digital I/O Touchscreen display Fiber optics FPGA 2 Voltage Measurement U-Regulator Power part steering and protection Main contactor steering Ground resistance measurement Dump survey

11. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 Constant current oscillations Mains = ~ Power supplies Rectifier filter constant current => constant power U intermediate I load I intermediate

12. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 Constant current oscillations Mains = ~ Constant power loads Rectifier filter U intermediate I intermediate t U intermediate I 1 =1A U 1 =10V I 0 =2A U 0 =5V P=10W ∆R= ∆U ∆I = 10V-5V 2A-1A -5V 1A = =-5Ω P

13. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 Constant current oscillations I R2 constant power 5KW filter rectifier power supplies

14. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 Constant current oscillations ~350A eff I R2 constant power 55KW filter rectifier power supplies

15. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 Constant current oscillations I R2 constant power 55KW filter rectifier power supplies damping

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

17. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 Constant current oscillations Mains = ~ Power supplies Rectifier filter U intermediate I load I intermediate filter C L L load L, C, L load => system order is 3 U load U load, I load => 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 Mains = ~ Power supplies Rectifier filter U intermediate I load I intermediate damping filter C L L load damping Stability at high current, Improved regulation quality Resistance of a self-repairing (POLYSWITCH) fuse

19. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 AC load Power supply I load filter C L SCR bridge 12 pulse U SCR f 0 =600Hz I SCR ~ constant U1U1 U2U2 U3U3

20. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 Power supply I load C L delay U=4V pp f 0 =600Hz ~ (I load Delta-Sigma ADC delay = 1ms) AC load

21. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 filter C L U=4V pp f 0 =600Hz delay ~ reaction ~ I load AC load

22. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 I load filter C L U=4V pp f 0 =600Hz pre-delay ~ pre-action ~ U=4V pp f 0 =600Hz action AC load

23. 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012 I load U=4V pp f 0 =600Hz ~~ U=4V pp f 0 =600Hz Power supply = Frequency generator 600Hz @ 4V pp => High internal filter current AC load

24. 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 About 3.5 Years experience 556 new designed power supplies in operation 655 power supplies including the Extension Conclusion 3rd Workshop on Power Converters for Particle Accelerators (POCPA) 2012