Selective Harmonic Elimination Pulse-Width Modulation for Matrix Converter based Solid-State Transformer

This paper presents a pulse width modulation (PWM) strategy based on selective harmonic elimination (SHE) for matrix converter based solid-state transformer (SST). The matrix converter based SST is a three-phase single-stage SST with 3×1 (source-side) and 1×3 (load-side) matrix converters and high frequency transformer for galvanic isolation. The SHE based PWM strategy is applied to the source side converter which reduces the filter size, prevents resonance and provides a uniform amplitude high-frequency sinusoidal voltage at the filter output. Pulse density modulation (PDM) is applied at the load-side converter which provides the desired low frequency voltage at the load. The formulation of the SHE-PWM for the switched voltage waveform at the source side converter output is presented and results are obtained through simulation in MATLAB/Simulink.