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Parallelized_three_phase_four_wire_converters.pdf (2.31 MB)

3D-Modulation and PI State-Feedback Control for Voltage Source Inverters with Split DC-Link

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posted on 11.03.2021, 08:44 by Christoph Hackl, Simon Krüner, Zhao Song
In this work, a novel three-phase grid inverter topology with split DC-link and LC-filter is discussed. A proportionalintegral (PI) state-feedback current and voltage controller is designed based on linear quadratic regulator (LQR) theory. The midpoint current ripple is suppressed by introducing the filter capacitor voltage as control target. Moreover, a 3-dimensional Space Vector Modulation (3D-SVM) for this topology is implemented, which allows for larger voltage amplitudes compared to conventional Pulse Width Modulation (PWM). Realistic simulation results show that the combination of PI state-feedback controller and 3D-SVM achieves faster and more accurate closedloop dynamics with less oscillations and better decoupling under varying and unbalanced grid conditions.

History

Email Address of Submitting Author

christoph.hackl@hm.edu

ORCID of Submitting Author

0000-0001-5829-6818

Submitting Author's Institution

Munich University of Applied Sciences

Submitting Author's Country

Germany