An Efficient Robust Power–Voltage Control for Three-Level NPC Converters in Microgrids | IEEE Journals & Magazine | IEEE Xplore

An Efficient Robust Power–Voltage Control for Three-Level NPC Converters in Microgrids


Abstract:

High penetration of power converters may lead to power ripple, voltage swings, and weak antidisturbances for microgrids. Confronting these issues, this work proposes a ro...Show More

Abstract:

High penetration of power converters may lead to power ripple, voltage swings, and weak antidisturbances for microgrids. Confronting these issues, this work proposes a robust control scheme, discrete-time super-twisting observer (DSTO)-embedded quasi-integral sliding-mode control (QISMC), for a three-level neutral-point-clamped power converter system, dramatically enhancing power/voltage regulation performance and antidisturbance capability. A fast convergence DSTO is deployed to offset multidisturbances caused by parameter mismatches, unknown loads, current path changes, switch mode noise, and self-compensating power/voltage tracking biases in QISMC. To further mitigate power/voltage steady-state error and boost system robustness, a new quasi-integral sliding-mode surface is built, inherently improving power/voltage tracking performance. Experimental data confirm that the proposed control outperforms the discrete-time extended-state-observer-based QISMC, DSTO-based quasi-sliding mode control, and discrete-time proportional–integral control in power/voltage, grid current harmonics, and robustness.
Published in: IEEE Transactions on Industrial Informatics ( Volume: 20, Issue: 4, April 2024)
Page(s): 5849 - 5863
Date of Publication: 25 December 2023

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