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3D-Modulation and PI State-Feedback Control for Voltage Source Inverters with Split DC-Link
  • Christoph Hackl ,
  • Simon Krüner ,
  • Zhao Song
Christoph Hackl
Munich University of Applied Sciences

Corresponding Author:[email protected]

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Simon Krüner
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Zhao Song
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Abstract

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.