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

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posted on 2021-03-11, 08:44 authored by Christoph HacklChristoph 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.


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Submitting Author's Institution

Munich University of Applied Sciences

Submitting Author's Country

  • Germany