Robust and Optimal Single-loop Voltage Controller for Grid-forming Voltage Source Inverters

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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Discrete state-space voltage controller for voltage source inverters with LC filter based on direct pole-zero placement design

2017 IEEE Applied Power Electronics Conference and Exposition (APEC) ◽

10.1109/apec.2017.7931088 ◽

2017 ◽

Cited By ~ 1

Author(s):

Hyeon-Sik Kim ◽

Hyun-Sam Jung ◽

Seung-Ki Sul

Keyword(s):

State Space ◽

Voltage Source ◽

Discrete State ◽

Voltage Source Inverters ◽

Voltage Controller ◽

Lc Filter ◽

Discrete State Space

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Inherent damping of single-loop digitally controlled voltage source inverters with LCL filters

2016 IEEE 25th International Symposium on Industrial Electronics (ISIE) ◽

10.1109/isie.2016.7744938 ◽

2016 ◽

Cited By ~ 1

Author(s):

Jianguo Wang ◽

Jiu Dun Yan ◽

Jiyan Zou

Keyword(s):

Voltage Source ◽

Single Loop ◽

Voltage Source Inverters ◽

Digitally Controlled

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

10.36227/techrxiv.14190938.v1 ◽

2021 ◽

Author(s):

Christoph Hackl ◽

Simon Krüner ◽

Zhao Song

Keyword(s):

State Feedback ◽

Pulse Width Modulation ◽

Dimensional Space ◽

Linear Quadratic Regulator ◽

State Feedback Control ◽

Voltage Source ◽

Linear Quadratic ◽

Voltage Source Inverters ◽

Voltage Controller ◽

Lc Filter

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.

Download Full-text