Digital Control of A Multi Level Inverter To Improve Gain And Control Performance

Abstract: This paper presents The Digital control of Multisampled multilevel inverter(MSMI), As the performance of digital signal processors is an enhancing, applying high sampling frequency becomes increasingly viable, The multisampling technique is developed to minimize the Total Harmonic Distortion(THD), reduce switching delay and increasing the Gain. The filter current ripple frequency is increased by the phase shifted pulse width modulation. The MSMI is contemporized to the peaks of the phase shifted carriers. The small-signal Z-domain model is an inferred to examine the MSMI. The MSMI is qualified by the capability of achieving higher feedback control gains, which betters the control performance and reduced the Filter Inductor Ripple Current and THD. The stability boundaries obtained from the root loci showing that the proposed Z-domain models are more effective in forecasting in stabilities, The proposed analysis, and simulation of a MSMI with digital controller closed loop technique 10–kHz switching frequency, 80–kHz sampling frequency Three-phase H-bridge inverter is tested to Five level and Seven levels was verified through MATLAB.

Keywords: Filter Inductor Ripple Current, Multisampled multilevel inverters, Phase-shifted PWM, Small-signal Z- domain model, Digital control system.