Control of a modular series parallel resonant converter system for a solid state 2.88MW/115-kV long pulse modulator

In this paper, a control strategy of a modular serial parallel resonant converter (SPRC) modulator system is presented and verified by simulations. The system is based on two SPRC modules forming an input series output parallel (ISOP) stack. To obtain the given output voltage of 115kV, 8 of these ISOP stacks are connected in parallel at the input and in series at the output, forming an input parallel output series (IPOS) system. For designing the control of this system, a large signal model is derived and the influence of component tolerances is investigated. The performance of the controller is shown with simulation results. The simulation model of a single module is validated by measurement results.