High Performance LQR Control of Modular Multilevel Converters with Simple Control Structure and Implementation

In this paper, a novel feedback controller concept for grid-connected Modular Multilevel Converters (MMC) is proposed. The controller is based on the Linear Quadratic Regulator (LQR) method and shows outstanding control performance since it is a multi-input multi-output (MIMO) controller. The propos...

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Bibliographic Details
Published in:2020 22nd European Conference on Power Electronics and Applications (EPE'20 ECCE Europe) pp. 1 - P.10
Main Authors: Jeong, Min, Fuchs, Simon, Biela, Jurgen
Format: Conference Proceeding
Language:English
Published: EPE Association 01.09.2020
Subjects:
Control systems
Cost function
Europe
Mathematical model
MIMO communication
Modelling
Modular multilevel converters
MPC (Model-based Predictive Control)
Multilevel converters
Optimal control
Voltage control
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Summary:In this paper, a novel feedback controller concept for grid-connected Modular Multilevel Converters (MMC) is proposed. The controller is based on the Linear Quadratic Regulator (LQR) method and shows outstanding control performance since it is a multi-input multi-output (MIMO) controller. The proposed controller achieves efficient energy balancing control with high bandwidth, such that the required margin for the module capacitance value for dynamic control is reduced and an excellent transient behavior can be accomplished. Alternatively, compact MMC designs can be realized with a reduced capacitance value by sacrificing some transient performance. The implementation requires a relatively low computational effort, and the simple control structure enables a straightforward tuning and time-delay compensation.
DOI:10.23919/EPE20ECCEEurope43536.2020.9215617