THD reduction in measurement of H - Bridge multilevel inverter using pulse modulated switching integrated with linear quadratic Regulator

Abstract

In this paper, the proposed Pulse Modulated Switching Cascaded H-bridge Multilevel Inverter (PM-SCHM) can be utilized for the reduction of Total Harmonic Distortion (THD). In high and medium power applications, multilevel inverters are commonly used. Because of the presence of harmonics in this scenario, THD has an impact on the overall efficiency of power electronics devices. The frequency analysis of a multilevel inverter is based on frequency spectra and numerical computation. A squared multilevel voltage waveform can be obtained by using an infinite range of switching harmonics. The proposed PM-SCHM scheme consists of a multi-level inverter arranged in an H-bridge sensor Cascaded manner. To compensate harmonic current magnitude in opposite direction Shunt Active Power Filter (APF) is used. A pulse modulation scheme is applied to the proposed PM-SCHM scheme for the arrangement of components using Linear Quadratic Regulator (LQR). The constructed LQR scheme utilizes a load for compensation with source voltage. This research focused on 5th order harmonics with a fundamental frequency of 50Hz. The comparative analysis of simulation results exhibited that the proposed Pulse Modulated Switching based Cascaded H bridge sensor Multilevel Inverter PM-SCHM scheme exhibits significant performance rather than the conventional technique.