CURRENT-SOURCE INVERTER WITH PERFECT SINUSOIDAL OUTPUT FOR ENERGIZING CRITICAL EQUIPMENT IN NUCLEAR FACILITIES

Document Type : Original Article

Authors

1 Reactors Department, Egyptian Atomic Energy Authority, Egypt.

2 Reactors Department, Egyptian Atomic Energy Authority, Egypt

3 Electrical Engineering Department, Faculty of Engineering, Al-Azhar University, Egypt

Abstract

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 optocoupler 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).

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