Three Phase Nine Level Modified NPC Grid Connected Inverter Topology with Proportional Resonant Based Control Strategy

International Journal of Electrical and Electronics Engineering

© 2025 by SSRG - IJEEE Journal

Volume 12 Issue 3

Year of Publication : 2025

Authors : Y. Sravan Kumar, T. Murali Krishna, Yesuratnam Guduri

10.14445/23488379/IJEEE-V12I3P113

How to Cite?

Y. Sravan Kumar, T. Murali Krishna, Yesuratnam Guduri, "Three Phase Nine Level Modified NPC Grid Connected Inverter Topology with Proportional Resonant Based Control Strategy," SSRG International Journal of Electrical and Electronics Engineering, vol. 12,  no. 3, pp. 128-136, 2025. Crossref, https://doi.org/10.14445/23488379/IJEEE-V12I3P113

Abstract:

Existing literature predominantly focuses on operational analyses of single-phase modified five-level neutral-point clamped (5L-NPC) inverter topologies in standalone configurations, with limited exploration of their closed-loop three-phase grid-connected (CL-3Ph-GC) counterparts. Critical gaps persist in addressing the interdisciplinary challenges of dynamic grid synchronization and harmonic interaction mechanisms inherent to three-phase architectures, necessitating holistic control frameworks that integrate advanced modulation strategies with grid compliance protocols to advance renewable energy integration. This paper proposes extending a three-phase, nine-level modified neutral point clamped grid-connected inverter (9L-MNPC-GCI) topology with a modified Proportional Resonant (PR) based control strategy. To generate nine levels in the pole voltage of 3-phase, a cascade connection of the modified 5L-NPC inverter topology with two cells has been considered, and it provides the greatest level of the line voltage. Prior to grid synchronization, the operational principles and implementation of the three-phase standalone system are analyzed, emphasizing the application of the Unipolar Phase Disposition Pulse Width Modulation (UPD-PWM) technique to achieve precise voltage regulation and harmonic suppression in islanded configurations. Compared with the normal Phase Disposition (PD) PWM technique, the implementation of the UPD-PWM technique is less. The same UPD-PWM technique has been incorporated at the end stage of a PR-based control strategy in 3Ph-GC. The entire PR-based control strategy is simpler than the conventional dq-frame control strategy. The study comprehensively examines the critical objectives of Active Power Control (APC), Reactive Power Control (RPC), and grid current harmonic mitigation within a CL-3Ph-GC. Utilizing the PLECS simulation platform, dynamic operational scenarios are employed to evaluate system performance under varying grid conditions.

Keywords:

Modified neutral point clamped, Grid-connected inverter, Proportional resonant controller, Pulse width modulation, Active power and reactive power.

References:

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