Disturbance Observer-Based Robust Model Predictive Control for a Voltage Sensorless Grid-Connected Inverter With an LCL Filter
This paper proposes a disturbance observer-based robust model predictive control (MPC) for a voltage sensorless grid-connected inverter with an inductive-capacitive-inductive (LCL) filter. A full-state estimator and a grid voltage observer are designed to reduce the number of sensors. A lumped distu...
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doaj-ce53847ad3af43b3bebbcee6bc4315ec2021-08-10T23:00:27ZengIEEEIEEE Access2169-35362021-01-01910979310980510.1109/ACCESS.2021.31026289507463Disturbance Observer-Based Robust Model Predictive Control for a Voltage Sensorless Grid-Connected Inverter With an LCL FilterNguyen Ngoc Nam0https://orcid.org/0000-0002-5129-8412Ngoc-Duc Nguyen1https://orcid.org/0000-0002-9650-8479Changwoo Yoon2Young Il Lee3https://orcid.org/0000-0003-3970-215XDepartment of Electrical and Information Engineering, Seoul National University of Science and Technology (SeoulTech), Seoul, South KoreaResearch Center of Electrical and Information Technology, Seoul National University of Science and Technology (SeoulTech), Seoul, South KoreaResearch Center of Electrical and Information Technology, Seoul National University of Science and Technology (SeoulTech), Seoul, South KoreaDepartment of Electrical and Information Engineering, Seoul National University of Science and Technology (SeoulTech), Seoul, South KoreaThis paper proposes a disturbance observer-based robust model predictive control (MPC) for a voltage sensorless grid-connected inverter with an inductive-capacitive-inductive (LCL) filter. A full-state estimator and a grid voltage observer are designed to reduce the number of sensors. A lumped disturbance observer, considering the parameter mismatch along with the grid impedance variation, is also designed to eliminate the steady-state error. A cost function, which consists of the error state and control input, is employed in the MPC design. Based on the Lyapunov stability, the full-state observer, voltage estimation, lumped disturbance observer, and the robust controller gains are obtained by solving an optimization problem based on linear matrix inequality (LMI). A frequency response analysis of the entire system is conducted to verify the reference tracking and disturbance rejection outcomes. As a result, the state and grid voltage observer outcomes converge to the actual values as rapidly as possible. The effectiveness of the proposed control method is demonstrated in comparison with the proportional-integral (PI) approach and with a controller recently proposed in the literature. Simulation and experimental results are presented to verify the effectiveness of the proposed method under LCL parameter uncertainties and grid impedance variations.https://ieeexplore.ieee.org/document/9507463/Sensorless model predictive control (MPC)disturbance observerthree-phase invertersinductive-capacitive-inductive (LCL) |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Nguyen Ngoc Nam Ngoc-Duc Nguyen Changwoo Yoon Young Il Lee |
spellingShingle |
Nguyen Ngoc Nam Ngoc-Duc Nguyen Changwoo Yoon Young Il Lee Disturbance Observer-Based Robust Model Predictive Control for a Voltage Sensorless Grid-Connected Inverter With an LCL Filter IEEE Access Sensorless model predictive control (MPC) disturbance observer three-phase inverters inductive-capacitive-inductive (LCL) |
author_facet |
Nguyen Ngoc Nam Ngoc-Duc Nguyen Changwoo Yoon Young Il Lee |
author_sort |
Nguyen Ngoc Nam |
title |
Disturbance Observer-Based Robust Model Predictive Control for a Voltage Sensorless Grid-Connected Inverter With an LCL Filter |
title_short |
Disturbance Observer-Based Robust Model Predictive Control for a Voltage Sensorless Grid-Connected Inverter With an LCL Filter |
title_full |
Disturbance Observer-Based Robust Model Predictive Control for a Voltage Sensorless Grid-Connected Inverter With an LCL Filter |
title_fullStr |
Disturbance Observer-Based Robust Model Predictive Control for a Voltage Sensorless Grid-Connected Inverter With an LCL Filter |
title_full_unstemmed |
Disturbance Observer-Based Robust Model Predictive Control for a Voltage Sensorless Grid-Connected Inverter With an LCL Filter |
title_sort |
disturbance observer-based robust model predictive control for a voltage sensorless grid-connected inverter with an lcl filter |
publisher |
IEEE |
series |
IEEE Access |
issn |
2169-3536 |
publishDate |
2021-01-01 |
description |
This paper proposes a disturbance observer-based robust model predictive control (MPC) for a voltage sensorless grid-connected inverter with an inductive-capacitive-inductive (LCL) filter. A full-state estimator and a grid voltage observer are designed to reduce the number of sensors. A lumped disturbance observer, considering the parameter mismatch along with the grid impedance variation, is also designed to eliminate the steady-state error. A cost function, which consists of the error state and control input, is employed in the MPC design. Based on the Lyapunov stability, the full-state observer, voltage estimation, lumped disturbance observer, and the robust controller gains are obtained by solving an optimization problem based on linear matrix inequality (LMI). A frequency response analysis of the entire system is conducted to verify the reference tracking and disturbance rejection outcomes. As a result, the state and grid voltage observer outcomes converge to the actual values as rapidly as possible. The effectiveness of the proposed control method is demonstrated in comparison with the proportional-integral (PI) approach and with a controller recently proposed in the literature. Simulation and experimental results are presented to verify the effectiveness of the proposed method under LCL parameter uncertainties and grid impedance variations. |
topic |
Sensorless model predictive control (MPC) disturbance observer three-phase inverters inductive-capacitive-inductive (LCL) |
url |
https://ieeexplore.ieee.org/document/9507463/ |
work_keys_str_mv |
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1721211788052135936 |