The Residual Ion Dump Power Supply (RIDPS) is part of the Ground Related Power Supplies, to be manufactured by OCEM Energy Technology s.r.l. (OCEM) for the MITICA experiment and for the two ITER Heating Neutral Beam Injectors (HNBI). MITICA is the full-scale prototype of the HNBI, under construction in the PRIMA Neutral Beam Test Facility in Padua, Italy. The RIDPS is devoted to feed the plates of the electrostatic Residual Ion Dump (RID), which deflects and collects the beam residual ions after the neutralization process. The maximum average voltage of the RIDPS is 25 kV, to which can be superimposed a sinusoidal or trapezoidal alternate voltage at 50 Hz, 5 kV maximum. The voltage can be regulated from 20% to 100%, keeping a maximum ripple of ±500 V. The nominal current is 60 A, with a maximum pulse length of 1 hr. The reference design of RIDPS is based on Pulse-Step-Modulator technology, with multi-winding dry transformer and a set of power modules connected in series at the output, each composed by ac/dc conversion system, dc-link and dc/dc regulator. This solution offers several advantages: high accuracy, redundancy at module level, high dynamics and no need of large output capacitor for ripple mitigation. The latter is particularly important in this application, to limit the energy in case of arches between RID plates and subsequent damages. OCEM, who supplies the RIDPS via a procurement contract with F4E, endorsed this design approach, and designed a system with 42 water-cooled power modules, easily replaceable, each with diode bridge, LRC filter with pre-charge network, two IGBTs within single package and full digital control board. In this paper, the detailed design of both power and control section of the RIDPS is described. The expected performance is shown through simulations, reproducing both normal operation and fault conditions.
The design of the Residual Ion Dump Power Supply for ITER Neutral Beam Injector
Gaio Elena;
2016
Abstract
The Residual Ion Dump Power Supply (RIDPS) is part of the Ground Related Power Supplies, to be manufactured by OCEM Energy Technology s.r.l. (OCEM) for the MITICA experiment and for the two ITER Heating Neutral Beam Injectors (HNBI). MITICA is the full-scale prototype of the HNBI, under construction in the PRIMA Neutral Beam Test Facility in Padua, Italy. The RIDPS is devoted to feed the plates of the electrostatic Residual Ion Dump (RID), which deflects and collects the beam residual ions after the neutralization process. The maximum average voltage of the RIDPS is 25 kV, to which can be superimposed a sinusoidal or trapezoidal alternate voltage at 50 Hz, 5 kV maximum. The voltage can be regulated from 20% to 100%, keeping a maximum ripple of ±500 V. The nominal current is 60 A, with a maximum pulse length of 1 hr. The reference design of RIDPS is based on Pulse-Step-Modulator technology, with multi-winding dry transformer and a set of power modules connected in series at the output, each composed by ac/dc conversion system, dc-link and dc/dc regulator. This solution offers several advantages: high accuracy, redundancy at module level, high dynamics and no need of large output capacitor for ripple mitigation. The latter is particularly important in this application, to limit the energy in case of arches between RID plates and subsequent damages. OCEM, who supplies the RIDPS via a procurement contract with F4E, endorsed this design approach, and designed a system with 42 water-cooled power modules, easily replaceable, each with diode bridge, LRC filter with pre-charge network, two IGBTs within single package and full digital control board. In this paper, the detailed design of both power and control section of the RIDPS is described. The expected performance is shown through simulations, reproducing both normal operation and fault conditions.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
