Current-source inverter with perfect sinusoidal output for energizing critical equipment in nuclear facilities

Abstract EN

The present work proposes an AC current-source inverter to energize critical equipment used in the nuclear facilities.

the basic switching circuit of the proposed current-source inverter is based on an H-bridge four MOSFETs with gate drivers and opt coupler isolators.

a well-designed LC filter is used for sinusoidal shaping of the H-bridge output voltage / current to get the inverter operating as an AC current source that satisfies the objectives of current regulation, frequency stabilization, and minimization of the total harmonic distortion (THD), a control system based on a fast DSP unit and a microcontroller is designed for cancelation of the higher-order harmonics to produce a pure sinusoidal output with almost zero total harmonic distortion (THD).

for experimental evaluation, a prototype is fabricated for the complete system of the proposed current-source inverter including the MOSFET bridge, LC filter, the feedback circuit, and the DSP unit.

it is shown by simulation as well as experimental measurement that the proposed current-source inverter provides current regulation, frequency stabilization with THD <6×10 (-4)% (it is nearly nonexistent).