Investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters

Multilevel Inverters (MLIs) are widely used in medium voltage applications due to their various advantages. In addition, there are numerous types of MLIs for such applications. However, the diode-less 3-level (3L) T-type Neutral Point Clamped (NPC) MLI is the most advantageous due to its low conduct...

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Main Authors: Chokkalingam, B., Bhaskar, M.S., Padmanaban, S., Ramachandaramurthy, V.K., Iqbal, A.
Format: Article
Language:English
Published: 2020
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Institution: Universiti Tenaga Nasional
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spelling my.uniten.dspace-130492020-03-11T03:20:54Z Investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters Chokkalingam, B. Bhaskar, M.S. Padmanaban, S. Ramachandaramurthy, V.K. Iqbal, A. Multilevel Inverters (MLIs) are widely used in medium voltage applications due to their various advantages. In addition, there are numerous types of MLIs for such applications. However, the diode-less 3-level (3L) T-type Neutral Point Clamped (NPC) MLI is the most advantageous due to its low conduction losses and high potential efficiency. The power circuit of a 3L T-type NPC is derived by the conventional two level inverter by a slight modification. In order to explore the MLI performance for various Pulse Width Modulation (PWM) schemes, this paper examines the operation of a 3L (five level line to line) T-type NPC MLI for various types of Multi-Carriers Pulse Width Modulation (MCPWM) schemes. These PWM schemes are compared in terms of their voltage profile, total harmonic distortion (THD) and conduction losses. In addition, a 3L T-type NPC MLI is also compared with the conventional NPC in terms of number of switches, clamping diodes, main diodes and capacitors. Moreover, the capacitor-balancing problem is also investigated using the Neutral Point Fluctuation (NPF) method with all of the MCPWM schemes. A 1kW 3L T-type NPC MLI is simulated in MATLAB/Simulink and implemented experimentally and its performance is tested with a 1HP induction motor. The results indicate that the 3L T-type NPC MLI has better performance than conventional NPC MLIs. © 2019 KIPE. 2020-02-03T03:30:02Z 2020-02-03T03:30:02Z 2019 Article 10.6113/JPE.2019.19.3.702 en
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description Multilevel Inverters (MLIs) are widely used in medium voltage applications due to their various advantages. In addition, there are numerous types of MLIs for such applications. However, the diode-less 3-level (3L) T-type Neutral Point Clamped (NPC) MLI is the most advantageous due to its low conduction losses and high potential efficiency. The power circuit of a 3L T-type NPC is derived by the conventional two level inverter by a slight modification. In order to explore the MLI performance for various Pulse Width Modulation (PWM) schemes, this paper examines the operation of a 3L (five level line to line) T-type NPC MLI for various types of Multi-Carriers Pulse Width Modulation (MCPWM) schemes. These PWM schemes are compared in terms of their voltage profile, total harmonic distortion (THD) and conduction losses. In addition, a 3L T-type NPC MLI is also compared with the conventional NPC in terms of number of switches, clamping diodes, main diodes and capacitors. Moreover, the capacitor-balancing problem is also investigated using the Neutral Point Fluctuation (NPF) method with all of the MCPWM schemes. A 1kW 3L T-type NPC MLI is simulated in MATLAB/Simulink and implemented experimentally and its performance is tested with a 1HP induction motor. The results indicate that the 3L T-type NPC MLI has better performance than conventional NPC MLIs. © 2019 KIPE.
format Article
author Chokkalingam, B.
Bhaskar, M.S.
Padmanaban, S.
Ramachandaramurthy, V.K.
Iqbal, A.
spellingShingle Chokkalingam, B.
Bhaskar, M.S.
Padmanaban, S.
Ramachandaramurthy, V.K.
Iqbal, A.
Investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters
author_facet Chokkalingam, B.
Bhaskar, M.S.
Padmanaban, S.
Ramachandaramurthy, V.K.
Iqbal, A.
author_sort Chokkalingam, B.
title Investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters
title_short Investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters
title_full Investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters
title_fullStr Investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters
title_full_unstemmed Investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters
title_sort investigations of multi-carrier pulse width modulation schemes for diode free neutral point clamped multilevel inverters
publishDate 2020
_version_ 1662758807524081664