Optimal Integrated Inner Controller Design in AC Microgrids

The optimal design of a microgrid's primary control's inner loops is a severe challenge in high-bandwidth (BW) applications. Mostly, nonoptimal controllers are given as a sublevel design for the current and voltage inner loops. Unlike conventional methods, such as proportional resonant, pr...

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Bibliographic Details
Published inIEEE transactions on power electronics Vol. 37; no. 9; pp. 10372 - 10383
Main Authors Batmani, Yazdan, Khayat, Yousef, Najafi, Shahabeddin, Guerrero, Josep M.
Format Journal Article
LanguageEnglish
Published New York IEEE 01.09.2022
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Aerospace electronics
Algorithms
Constraining
Control systems design
Controllers
Distortion
Distributed generation
Inductance
Inner controller
Limiting
microgrid (MG)
optimal tracking
Performance indices
Predictive control
primary control (PC)
Proportional integral
Reactive power
State feedback
Voltage control
Voltage distortion
Waveforms
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ISSN0885-8993
1941-0107
DOI10.1109/TPEL.2022.3165355

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Summary:The optimal design of a microgrid's primary control's inner loops is a severe challenge in high-bandwidth (BW) applications. Mostly, nonoptimal controllers are given as a sublevel design for the current and voltage inner loops. Unlike conventional methods, such as proportional resonant, proportional-integral, and finite-set model predictive control, in this article, an optimal integrated inner controller is proposed based on a linear quadratic tracking (LQT) methodology. In the proposed method, a model-based optimal LQT controls the microgrid's voltage and current simultaneously. By employing this method, a performance index, which is a system energy indicator is minimized, and the BW of the controller is systematically adjusted through the employed weighting matrices in the performance index. Besides, a current limiting mechanism is provided for the proposed method, which discriminates its applicability for practical purposes. Unlike the conventional current limiting algorithms, which limit the sine-waveform of the current, the proposed method limits the amplitude of the current and causes less current and voltage distortions during over-current situations. The simulation and experimental results reveal the superiority of the proposed method.
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ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2022.3165355