Abstract
Multilevel inverters produced lot of interest in academia and industry as they are becoming feasible technology for number of applications. These are considered as the progressing power converter topologies. To generate a quality output waveform with minimum number of switches, reduced switch multilevel inverter topologies has come in focus. This paper introduces a modified symmetrical MLI with reduced component count thereby ensuring the minimum switching losses, reduced total harmonic distortion, Size and installation cost. By proper combination of switches it produces a staircase output waveform with low harmonic distortion. In this paper novel symmetrical inverter topology with reduced component count based on level shift phase opposition and disposition PWM (PODPWM) is proposed. The results are validated using MATLAB/SIMULINK.
Highlights
The term “Multilevel Inverter” has played an important role in the recent years and is suitable for medium to highvoltage applications such as renewable energy sources, Industrial drives, fans, blowers because of their capability to synthesize output voltage waveform with better harmonic spectra, better output voltage
In this paper a novel symmetrical inverter topology with reduced component count based on level shift phase opposition and disposition PWM (PODPWM) is proposed
In the proposed symmetrical reduced switch Multilevel Inverter topology the number of switches (NS) required to produce number of levels (NL) is given by eq (1) & (2) and the maximum output voltage is given by eq (3)
Summary
The term “Multilevel Inverter” has played an important role in the recent years and is suitable for medium to highvoltage applications such as renewable energy sources, Industrial drives, fans, blowers because of their capability to synthesize output voltage waveform with better harmonic spectra, better output voltage. The above mentioned conventional MLI finds number of applications, all these topologies need more number of switches to produce higher voltages. Reducing the number of diodes used, voltage sources, switches and capacitors can improve the quality as well as reduce the switching losses, overall cost etc., [5]. In this paper a novel symmetrical inverter topology with reduced component count based on level shift phase opposition and disposition PWM (PODPWM) is proposed. It consists of two isolated DC sources and six unidirectional switches (T1, T2, T3, T4, S1 and S2). Fig. (b) gives the proposed 11 level symmetrical novel inverter topology with reduced switch count
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