Article
Multidisciplinary Sciences
Ali Mazaheri, Farhad Barati, Farideh Ghavipanjeh
Summary: This paper proposes a Linear Quadratic Gaussian (LQG) multivariable control approach to compensate for the dead-time effects in three-phase grid-tied inverters. By running the inverter in current-controlled mode and using the LQG controller, high performance and attenuation of disturbances are achieved. Experimental results demonstrate the excellent performance of the proposed approach in attenuating the dead-time introduced harmonics.
SCIENTIFIC REPORTS
(2023)
Article
Thermodynamics
Zhenlong Wu, Yanhong Liu, Donghai Li, YangQuan Chen
Summary: This paper proposes a multivariable active disturbance rejection control (ADRC) for a compression liquid chiller system, where the loop coupling is estimated and compensated in real-time by enhanced reduced-order extended state observer (ESO) and static decoupling. The simulation results illustrate that the proposed control strategy can guarantee satisfactory tracking performance and estimate the loop coupling completely under different operating conditions. Compared with the decentralized regular ADRC, the performance of the loop coupling rejection and the fluctuation of the control signal have improved significantly.
Article
Automation & Control Systems
Blanca Viviana Martinez Carvajal, Javier Sanchis Saez, Sergio Garcia-Nieto Rodriguez, Miguel Martinez Iranzo
Summary: This paper presents a novel control strategy that combines state-space model predictive control (MPC) and active disturbance rejection control (ADRC) to provide active disturbance rejection predictive control on constrained systems with no nominal identified model. The proposed strategy relaxes the modelling requirement and incorporates a third-order discrete extended state observer (ESO) for estimating model mismatch and assumed plant states. Additionally, constraints handling is addressed by including a compensation term related to total perturbation in the definition of the optimization problem constraints.
Article
Thermodynamics
He Dong, Wei Zhang, Minxuan Li, Zhibo Zeng, Di Cao, Xiaoping Li
Summary: This paper introduces a general control loop for high-precision air temperature control, which can reject disturbances and reduce noise to improve control accuracy. A controller with compensators is designed based on loop shaping to achieve a tradeoff between disturbance rejection and noise attenuation. Experimental results demonstrate that the controller can improve disturbance rejection performance while reducing sensitivity to noise.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Automation & Control Systems
Yun Cheng, Yunlei Fan, Pengcheng Zhang, Yinlong Yuan, Junhong Li
Summary: This paper proposes a new parameter tuning approach for active disturbance rejection control (ADRC) of multi-input multi-output (MIMO) uncertain systems. The control schemes are transformed into a two-degree-of-freedom (2DOF) equivalent structure for analysis. A parameter tuning approach based on multivariable quantitative feedback theory (QFT) is proposed to achieve the desired performance. The effectiveness of the tuning approach is verified and the advantages of the ADRC control schemes are analyzed.
Article
Automation & Control Systems
Bin Xu, Xia Wang, Weisheng Chen, Peng Shi
Summary: This article explores a robust adaptive learning control strategy for uncertain single-input-single-output systems, employing dynamic surface control and sliding-mode control, with a focus on fast convergence and robust tracking performance through the combination of intelligent design and robust technique.
IEEE TRANSACTIONS ON CYBERNETICS
(2021)
Article
Automation & Control Systems
Qicheng Mei, Jinhua She, Feng Wang, Yosuke Nakanishi
Summary: This article presents an improved equivalent-input-disturbance (EID) approach that actively rejects exogenous disturbances for a plant. The control system based on this approach includes a new EID estimator constructed by embedding integrals to the conventional EID estimator, which enhances disturbance estimation precision without amplifying measurement noise. Stability conditions of the control system are obtained using the separation theorem, and the system design ensures these conditions are satisfied. Experimental results from a rotational control system validate the effectiveness of the approach.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Automation & Control Systems
Wei Wei, Bowen Duan, Min Zuo, Quanmin Zhu
Summary: This study proposes an extended state observer-based U-model control (ESOUC) method to generate population restriction policies for faster suppression of COVID-19 transmission and facilitating economic recovery.
Article
Astronomy & Astrophysics
Ning Li, Na Wang, Zhiyong Liu, Lei Yang
Summary: A conservative double-loop controller for large antennas is designed in this paper, which combines a Linear Active Disturbance Rejecting Controller (LADRC) and a PD controller to achieve better tracking and disturbance rejection performance. Simulation results show that the proposed controller has smoother response curves, shorter settling time, and better wind disturbance rejection.
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC
(2023)
Article
Thermodynamics
He Dong, Xiaoping Li, Xin He, Zhibo Zeng, Guojun Wen
Summary: This paper proposes a two-degree-of-freedom (2DOF) controller to overcome the difficulties of large inertia and time delay in lithography equipment. Model predictive control (MPC), loop shaping, and Kalman filter are used to optimize the system and effectively avoid oscillation and load disturbance, thus increasing the system precision.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Mathematics
Ahmad Taher Azar, Farah Ayad Abdul-Majeed, Hasan Sh Majdi, Ibrahim A. Hameed, Nashwa Ahmad Kamal, Anwar Jaafar Mohamad Jawad, Ali Hashim Abbas, Wameedh Riyadh Abdul-Adheem, Ibraheem Kasim Ibraheem
Summary: This paper presents a novel nonlinear higher-order extended state observer (NHOESO) for efficient state and disturbance estimation in the presence of measurement noise for nonlinear systems. The proposed observer allows fast reconstruction of the system's states and is robust against uncertainties and measurement noise. Simulation results demonstrate the effectiveness of the proposed observer.
Article
Automation & Control Systems
Lukas Marko, Martin Saxinger, Andreas Steinboeck, Andreas Kugi
Summary: This study focuses on the cancellation of unknown multi-harmonic disturbances in flexible mechanical structures. A decentralized control scheme is proposed, which exploits the passivity property of the closed-loop system and estimates the unknown disturbance frequency in a centralized manner. Experimental results demonstrate the effectiveness and robustness of the proposed control scheme.
Article
Construction & Building Technology
Jiarui Zhang, Yaoyang Zhu, Zhao Li, Jianwei Tu
Summary: Currently, most common placement methods of actuators select optimal locations based on structural response and system energy, which neglect the controllability contribution and energy of seismic excitations, requiring a large number of calculations. To address this issue, this study combines the Clough-Penzien spectral model with the Luenberger observable normal form of the system to calculate the energy of each state. By considering modal energy and controllability, a novel optimal placement method based on modal controllability degree is proposed, dividing modes into main disturbance modes (MDMs) and secondary disturbance modes (SDMs). Results from optimal actuator placement and vibration control simulation on a 20-story building model demonstrate that the proposed method yields significantly better vibration reduction effect compared to the uniformly distributed actuators (Uniform method) and classical placement method based on system controllability gramian matrix (Classical method).
Article
Automation & Control Systems
Tao Jiang, Jiangshuai Huang, Xiaojie Su
Summary: This work proposes a finite-time tracking control scheme for a multi-input-multi-output system with multisource uncertainties. By transforming the constrained problem into an equivalent unconstrained problem and attenuating the effect of uncertainties using a composite neural adaptive law, the control system achieves multivariable finite-time prescribed performance.
IEEE TRANSACTIONS ON SYSTEMS MAN CYBERNETICS-SYSTEMS
(2023)
Article
Automation & Control Systems
Sen Chen, Zhixiang Chen
Summary: This article presents an active disturbance rejection control design for nonlinear uncertain systems with measurement uncertainty, aiming to capture the total effect of multiple uncertainties to achieve control. The highly consistent transient performance of tracking is theoretically revealed, along with the qualitative relationship between tracking error and controller parameters. Simulation and experimental results support the effectiveness of the proposed method.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
