Design and analysis of high voltage DC power supply system for the nuclear fusion application

Institute for Plasma Research (IPR), a premier national institute working in the field of plasma physics and nuclear fusion has designed a 500 kV/2 A DC High Voltage Power Supply (HVPS) System. This power supply is best suited for High Power (≥ 1 MW) and High Energy (≥100 keV) Neutral Beam Injector (NBI), an important Heating & Current Drive System used in magnetic confinement reactor TOKAMAK. The HVPS design emphasizes on its tight performance requirements viz. wider output voltage control range (20 % - 100 %), stability (≤ 1 %), ripple (≤ 5 %), fast turn ON & OFF time (few tens of µsec), repeated breakdown withstand capability together with lower input harmonics and near unity power factor. The design also takes into account the modularity, scalability, reliability, availability and maintainability aspects. The power supply comprises of a thyristor controlled rectifier forming common DC-Link powering the five stages of Inverter coupled High Voltage Transformer Rectifiers Units (HV-TRU). The output of each HV-TRUs are connected in series to produce 500 kV DC output. This paper elaborates the design of HVPS for NBI system including component sizing, selection, and topology of all the key elements of the power supply system supported by the simulation analysis carried out in ®MATLAB/Simulink/SimPowerSys validating the functional and performance requirements mentioned above.