Programmable Device Circuits and Systems

T. Porselvi ¹, K. Veeralakshmi ², Ranganathmuthu ³

Affiliations
1 Department of Electrical & Electronics Engineering, Sri Sairam Engineering College, IN
2 Sri Sairam Engineering College, IN
3 Department of Electrical & Electronics Engineering, SSN College Engineering, Kalavakkam (Near Chennai), IN

Abstract

Multilevel inverters synthesize the AC voltage from several different levels of DC voltages. Each additional DC voltage level adds a step to the AC voltage waveform. By switching the DC voltages to the AC output a staircase waveform can be produced which approaches the sinusoidal waveform with minimum harmonic distortion, compared to a full bridge inverter which can generate two or three level voltage waveforms at its AC output. This paper describes about the comparison of H-bridge inverter using Phase disposition (PD) & hybrid multicarrier technique for different level with one DC source. This comparison is based on the THD value of the output phase voltage of the inverters. Simulation is done using MATLAB/SIMULINK software and the results demonstrate the effectiveness of the proposed strategy.

Keywords

Cascaded Multilevel Inverter, Hybrid, PWM, Single DC Source.

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G. Aarthi ¹, T. Porselvi ¹

Affiliations
1 Department of Electrical and Electronics Engineering, Sri Sairam Engineering College, Chennai, Tamilnadu, IN

Abstract

This paper implements a high performance controlled AC-DC rectifier using a Single Phase Matrix Converter (SPMC) topology. A combination of two such converters with their output terminals connected in anti-parallel (dual converter) allows operation in all four quadrants. For a closed loop controlled rectifier, the usual Pulse Width Modulation (PWM) has been extended to produce an Active Pulse Width Modulation to correct the pulsating nature of input current. A current wave shaping control loop using the proportional integral control is used in order to maintain the input current waveform sinusoidal, continuous and in phase with the supply voltage. A safe switching sequence is incorporated to avoid voltage and current spikes. The circuit simulations were presented in MATLAB/Simulink to verify the proposed operation.

Keywords

AC-DC Converter, Single Phase Matrix Converter, Dual Converter, Pulse Width Modulation, MATLAB/Simulink.

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