Synthesis and performance investigation of a digitally controlled three-phase neutral-point clamped bidirectional rectifier
In this study, parameter plane synthesis of a three-phase neutral-point clamped bidirectional rectifier has been performed. The converter involves one outer-loop PI voltage controller and two inner-loop proportional–integral (PI) current controllers for closed-loop control. A D-partition technique has been employed for precise design of the current controllers. The performance of the converter has been evaluated using MATLAB/Simulink software. An experimental prototype of the converter has been developed and the experimental investigation of the converter performance in closed loop has been carried out. DSP ‘DS1104’ of digital signal processing and control engineering (dSPACE) has been used for real-time implementation of the designed controllers. The converter gives a very good performance in steady-state and dynamic state (for rectification as well as inversion modes of operation) using the designed controller parameters.