<abstract xmlns="http://www.w3.org/1999/xhtml"><p>This paper presents a comparative evaluation of multilevel DC link inverter of photovoltaic (PV) renewable energy system using either symmetrical or asymmetrical dc sources. The four units of dc source can have the same dc voltage level, <italic>ie</italic> 81.32 V, resulting in symmetrical dc sources. The asymmetrical dc sources consist of input dc voltages in binary sequence, 21.68 V, 43.37 V, 86.74 V and 173.48 V. The boost converters with maximum power point tracking (MPPT) capability which is regulated by perturb and observe (P&amp;O) based control are connected between the PV panels and the four dc sources. The varying dc voltages from the PV panels are regulated to track the maximum power available regardless of the irradiance and temperature conditions. The symmetrical dc sources will facilitate the generation of 9 levels of staircase ac waveform rms of 230 V after the H-bridge inverter. Whereas, the asymmetrical dc sources are able to produce 31 levels of staircase ac waveform also with rated rms 230 V. Detailed analysis and comparison on the powers, ac output voltage, output current, total harmonic distortions, and MPPT achievement are described.</p></abstract>

This paper presents a comparative evaluation of multilevel DC link inverter of photovoltaic (PV) renewable energy system using either symmetrical or asymmetrical dc sources. The four units of dc source can have the same dc voltage level, ie 81.32 V, resulting in symmetrical dc sources. The asymmetrical dc sources consist of input dc voltages in binary sequence, 21.68 V, 43.37 V, 86.74 V and 173.48 V. The boost converters with maximum power point tracking (MPPT) capability which is regulated by perturb and observe (P&O) based control are connected between the PV panels and the four dc sources. The varying dc voltages from the PV panels are regulated to track the maximum power available regardless of the irradiance and temperature conditions. The symmetrical dc sources will facilitate the generation of 9 levels of staircase ac waveform rms of 230 V after the H-bridge inverter. Whereas, the asymmetrical dc sources are able to produce 31 levels of staircase ac waveform also with rated rms 230 V. Detailed analysis and comparison on the powers, ac output voltage, output current, total harmonic distortions, and MPPT achievement are described.

Comparative evaluation of multilevel DC link inverter using symmetrical and asymmetrical DC sources

School of Electrical & Electronic Engineering

Journal of Electrical Engineering

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

This paper presents a comparative evaluation of multilevel DC link inverter of photovoltaic (PV) renewable energy system using either symmetrical or...

Comparative evaluation of multilevel DC link inverter using symmetrical and asymmetrical DC sources

Published Online: May 13, 2019

Page range: 122 - 129

Received: Dec 28, 2018

DOI: https://doi.org/10.2478/jee-2019-0018

Keywords
multilevel dc link inverter, symmetrical and asymmetrical configuration, perturb and observe, photovoltaic

© 2019 Muhammad Najwan Hamidi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Comparative evaluation of multilevel DC link inverter using symmetrical and asymmetrical DC sources

Published Online: May 13, 2019

Page range: 122 - 129

Received: Dec 28, 2018

DOI: https://doi.org/10.2478/jee-2019-0018

Keywordsmultilevel dc link inverter, symmetrical and asymmetrical configuration, perturb and observe, photovoltaic

© 2019 Muhammad Najwan Hamidi et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Keywords
multilevel dc link inverter, symmetrical and asymmetrical configuration, perturb and observe, photovoltaic