Article
Automation & Control Systems
Dingchao Ren, Junlin Xiong, Daniel W. C. Ho
Summary: This paper investigates the design of static output feedback (SOF) NI controllers with H-infinity performance and proposes an iterative LMI-based algorithm for synthesis.
Article
Mathematics, Applied
Hadi Gholami, Mohammad Hossein Shafiei
Summary: This paper designs static and dynamic output feedback controllers for a class of switched nonlinear time-delay systems to achieve finite-time boundedness under the presence of disturbances and uncertainties. An H-infinity index with respect to disturbances is guaranteed using auxiliary matrices and the average dwell time method. The theorems presented in this paper are less conservative and provide more degrees of freedom for feasible solutions compared to existing literature.
APPLIED MATHEMATICS AND COMPUTATION
(2021)
Article
Automation & Control Systems
Jenq-Lang Wu
Summary: This note discusses the design of static output feedback mixed H-2/H-infinity controllers for linear control systems with constraints on the feedback matrix. The authors propose an approach based on the barrier method to solve the nonconvex-constrained optimization problem. Necessary conditions for the optimal solution are derived using the Lagrange multiplier method, and an iterative steepest descent algorithm is developed for finding an approximate optimal solution. An example is provided to demonstrate the effectiveness of the proposed approach.
IEEE TRANSACTIONS ON AUTOMATIC CONTROL
(2023)
Article
Automation & Control Systems
Hassene Gritli, Ali Zemouche, Safya Belghith
Summary: This paper addresses the problem of SOF stabilisation for continuous-time linear systems subject to parameter uncertainties using the LMI approach. It presents the transformation of BMI into a new LMI with a line search over a scalar variable, as well as the development of a less conservative LMI condition with a line search over two scalar variables. Additionally, simplified versions of the LMI conditions without fixed parameters are also introduced.
INTERNATIONAL JOURNAL OF SYSTEMS SCIENCE
(2021)
Article
Automation & Control Systems
Zhi-Yong Feng, Huiru Guo, Jinhua She, Li Xu
Summary: This paper addresses the weighted sensitivity design of multivariable PID controllers for MIMO processes, presenting a design procedure and demonstrating the effectiveness and performance through application examples.
JOURNAL OF PROCESS CONTROL
(2022)
Article
Engineering, Electrical & Electronic
Siamak Derakhshan, Marjan Shafiee-Rad, Qobad Shafiee, Mohammad Reza Jahed-Motlagh, Subham Sahoo, Frede Blaabjerg
Summary: This article presents an optimal decentralized robust H-infinity control system for the voltage control problem of autonomous uncertain dc microgrids, which is validated through simulations and experimental studies for its effectiveness and robust performance.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Computer Science, Hardware & Architecture
Wenjun Gao, Yang Yang, Hongtao Duan, Mingsheng Li, Jinrong Ma, Songwei Jin
Summary: The paper investigates output feedback robust H-infinity stabilization for a class of discrete-time 2-D switched systems represented by the Roesser model with uncertainties. Sufficient conditions for exponential stability are derived via the average dwell time method when the system's interference and external input are zero, and the weighted robust H-infinity disturbance attenuation performance is further analyzed in the case of introducing external interference.
COMPUTER SYSTEMS SCIENCE AND ENGINEERING
(2021)
Article
Automation & Control Systems
Tobias Holicki, Carsten W. Scherer
Summary: The dual iteration, introduced in 1997 by Iwasaki, is an iterative and heuristic procedure for designing static output-feedback controllers. It can be seamlessly extended to practical output-feedback designs through the framework of linear fractional representations. A novel control theoretic interpretation is provided, allowing for further generalizations of the powerful scheme to situations where the elimination lemma is not applicable.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2021)
Article
Automation & Control Systems
Yinghong Zhao, Yangfan Liu, Yuechao Ma
Summary: This paper addresses the finite-time bounded issue for discrete-time singular time-varying delay system using sliding mode control method, presenting suitable control law and solving method. The superiority and practicality of the results are demonstrated through numerical examples.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2021)
Article
Automation & Control Systems
Peng Li, Yijing Wang, Zhiqiang Zuo
Summary: This paper presents a robust multiple frequency voltage-mode control scheme for a DC-DC boost converter that deals with parameter uncertainties, load, and source voltage disturbances. By analyzing the frequency characteristics of different types of disturbances, the authors determine multiple frequency intervals in the small signal model of the converter. Stability and robustness analysis over these intervals is conducted using an integral quadratic constraint method. A two-stage algorithm is proposed to design a specific voltage-mode controller that ensures desired H infinity performance. Simulation results demonstrate the superiority of the proposed controller in terms of H infinity performance, maximum voltage fluctuation, and regulating time. Experimental results further validate the superior performance of the proposed controller in practical voltage regulation.
JOURNAL OF THE FRANKLIN INSTITUTE-ENGINEERING AND APPLIED MATHEMATICS
(2023)
Article
Automation & Control Systems
Ismail Er-Rachid, Redouane Chaibi, El Houssaine Tissir, Abdelaziz Hmamed
Summary: This article discusses robust static output feedback H-infinity control in the finite frequency domain for polynomial Takagi-Sugeno fuzzy systems. It introduces simplified controller design conditions using the generalized Kalman-Yakubovich-Popov lemma and polynomial Lyapunov functions, and provides numerical examples to demonstrate the effectiveness of the proposed approach.
OPTIMAL CONTROL APPLICATIONS & METHODS
(2022)
Article
Automation & Control Systems
Payam Haghighi, Babak Tavassoli
Summary: This article addresses the problem of robust static output feedback H-infinity control for networked control systems with uncertainties in both controlled-plant and communication subsystems. It employs Markov chains to model the network-induced delays and derives a new sufficient condition expressed in terms of linear matrix inequalities for the robust H-infinity control problem without constraints on matrix variables.
INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL
(2021)
Article
Automation & Control Systems
Taiyou Liu, Xiaowei Wang, Jing Zhao, Pak Kin Wong, Yongfu Wang
Summary: This article introduces a robust H-infinity fuzzy static output feedback (RHF-SOF) control with norm-bounded strategy to enhance the path-following performance for the four-wheel-independent-driven electric vehicles (FWID-EVs). The control method takes into account parameter uncertainties, difficulty of online lateral velocity measurement, and actuator saturation problem. The proposed controller is verified and evaluated through the hardware-in-the-loop experimental test.
INTERNATIONAL JOURNAL OF FUZZY SYSTEMS
(2023)
Article
Computer Science, Artificial Intelligence
Yachun Yang, Zhengwen Tu, Liangwei Wang, Jinde Cao, Lei Shi, Wenhua Qian
Summary: This paper investigates H-infinity exponential synchronization of neural networks with delay through the design of a flexible event-triggered dynamic output feedback controller. The use of delay-partitioning method and linear matrix inequalities for synchronization criteria, along with a simple algorithm for control gains design, demonstrates the advantages of the theoretical analysis.
Article
Automation & Control Systems
Tanagorn Jennawasin, David Banjerdpongchai
Summary: This paper presents a novel static output feedback stabilization method for polynomial systems with bounded actuators. The proposed approach enhances the stability of polynomial systems under parametric uncertainty, utilizing bilinear design conditions and iterative algorithms to solve the design problems. The effectiveness of the proposed method is demonstrated through numerical examples.
Article
Engineering, Electrical & Electronic
Jia Liu, Yushi Miura, Hassan Bevrani, Toshifumi Ise
Summary: This article proposes a unified modeling method of VSG-based IIDG to analyze its different dynamic performance in each operation mode. The analyses reveal the intrinsic differences and correlations of the dynamics of VSG-based IIDG between each operation mode.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Zeinab Karami, Qobad Shafiee, Subham Sahoo, Meysam Yaribeygi, Hassan Bevrani, Tomislav Dragicevic
Summary: This research proposes a hybrid model predictive controller for stability of DC microgrids and performance enhancement of DC-DC boost converters interfaced with constant power loads (CPLs). The controller takes into account different modes of operation induced by semiconductor switches and the highly non-linear nature of CPL, aiming to minimize a finite prediction horizon cost function to define an optimal tracking control problem. The effectiveness of the proposed approach is verified through comparative evaluation with other control methods under experimental conditions.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2021)
Article
Engineering, Electrical & Electronic
Mobin Naderi, Qobad Shafiee, Hassan Bevrani, Frede Blaabjerg
Summary: This paper proposes a low-order low-frequency small-signal model for large-scale interconnected AC microgrids, which simplifies the model by identifying significant modules through sensitivity analysis and enables frequency analysis and control.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Jia Liu, Hemin Golpira, Hassan Bevrani, Toshifumi Ise
Summary: This paper proposes a simple power system modeling method to analyze the grid integration effect of a virtual synchronous generator (VSG), showing high efficiency in representing slow power and frequency deviations. Modal analyses provide insight into the synthesis of system poles by individual generator poles, and the impact of different VSG designs on system oscillation modes. Discussions on potential errors due to topology simplifications and measures to avoid them are included.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2021)
Article
Chemistry, Analytical
Lilia Tightiz, Hyosik Yang, Hassan Bevrani
Summary: This paper focuses on providing a communication framework for the interaction between the power grid management system and microgrid central controller in order to support power system frequency regulation using renewable energy sources. By emulating the information model of the IEC 61850 protocol and utilizing IoT's transmission protocol data distribution services, the communication structure meets interoperability requirements and communication needs in wide-area networks. The study evaluates the performance of data distribution services in terms of latency, reliability, and security on a real communication testbed, highlighting the importance of a robust communication architecture for effective frequency regulation.
Article
Engineering, Electrical & Electronic
Ali Rafiee, Yazdan Batmani, Farahnaz Ahmadi, Hassan Bevrani
Summary: The increase of renewable energy sources with power electronic interfaces in traditional power systems reduces the inertia constant and damping coefficient, leading to more uncertainty and sensitivity to disturbances. The concept of virtual synchronous generator (VSG) is used to emulate synchronous generator properties, with the quantitative feedback theory (QFT) tuning VSG parameters for robust system stability and performance, while considering disturbance attenuation. The proposed strategy is shown through frequency response analysis and time-domain simulations to successfully solve the load-frequency control problem in islanded microgrids, with the QFT-based VSG outperforming a robust VSG designed by the H-infinity technique against disturbances.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2021)
Article
Engineering, Electrical & Electronic
Ali Rafiee, Yazdan Batmani, Hassan Bevrani, Toshiji Kato
Summary: In this paper, a robust MIMO controller is proposed for power sharing among distributed generators in microgrids. The relative gain array matrix is used for input-output pairing and proper pre-compensators are designed to reduce adverse effects of interactions among control loops. The controller achieves robust stability and desired disturbance attenuation level for all the control loops.
IEEE TRANSACTIONS ON SMART GRID
(2022)
Article
Computer Science, Information Systems
Garba Elhassan, Shamsul Aizam Zulkifli, Solomon Zakwoi Iliya, Hassan Bevrani, Momoh Kabir, Ronald Jackson, Mubashir Hayat Khan, Mohammed Ahmed
Summary: Discrete-time dynamic systems have exciting possibilities in control, including the ability to determine unknown system parameters by measuring present inputs and outputs, and achieving zero steady-state error in finite settling time. This paper systematically examines the use of deadbeat current control in grid-connected inverter applications, addressing key research issues.
Article
Engineering, Electrical & Electronic
Yousef Khayat, Rasool Heydari, Mobin Naderi, Tomislav Dragicevic, Qobad Shafiee, Mohammad Fathi, Hassan Bevrani, Frede Blaabjerg
Summary: This article presents a decentralized secondary control based on active power estimation, utilizing frequency as a global variable in autonomous ac microgrids. The control, using a consensus protocol, restores frequency to the nominal value and maintains accurate power sharing. Experimental results validate the effectiveness of the proposed structure with four distributed generation units.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jia Liu, Hassan Bevrani, Toshifumi Ise
Summary: This article presents a design-oriented modeling approach to analyze the Q-V control loop of grid-forming distributed generators (DGs). It compares and analyzes two major Q-V control schemes and provides a better understanding of the Q-V control loop of grid-forming DGs.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Mobin Naderi, Yousef Khayat, Qobad Shafiee, Tomislav Dragicevic, Frede Blaabjerg, Hassan Bevrani
Summary: This article discusses the application of interconnected microgrids in handling emergency situations of individual microgrids by exchanging active and reactive powers to maintain stable voltage and frequency. Logical control and droop control are employed to determine the required power exchange based on local voltage and frequency, improving the reliability of interconnected microgrids.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Energy & Fuels
Yazdan Batmani, Yousef Khayat, Assad Salimi, Hassan Bevrani, Sohrab Mirsaeidi, Charalambos Konstantinou
Summary: This paper addresses the issues of nonlinear dynamics and input constraints in DC microgrids by systematically developing nonlinear suboptimal controllers using the state-dependent Riccati equation (SDRE) methodology. An artificial neural network (ANN) is also employed for fast and effective fault detection/isolation. Simulation results demonstrate the merits of the proposed scheme.
Article
Engineering, Electrical & Electronic
Farahnaz Ahmadi, Yazdan Batmani, Hassan Bevrani, Tianxiao Yang, Chenggang Cui
Summary: This paper investigates the use of a nonlinear synergetic control method to ensure the DC bus voltage stability of DC microgrids with constant power loads (CPLs). A macro-variable is defined using the synergetic control theory to regulate the capacitor voltage, and an improved macro-variable with integral action is introduced to enhance system performance and sensitivity to input voltage, CPL, and resistive load parameters. A finite-time synergetic controller is proposed to achieve finite-time convergence of the DC microgrid voltage and prevent chattering phenomenon.
IEEE TRANSACTIONS ON SMART GRID
(2023)
Article
Engineering, Electrical & Electronic
Hemin Golpira, Hassan Bevrani, Arturo Roman Messina, Bruno Francois
Summary: This paper presents a measurement-based under-frequency load shedding scheme that considers time delays, measurement uncertainties, and communication network faults. It proposes an iterative approach using a moving first-degree polynomial function to estimate the frequency nadir and associated time. It also develops a novel method to simultaneously estimate power imbalance and system inertia constant. Furthermore, it investigates a mathematical index to calculate a threshold for power imbalance, and proposes a systematic approach for specifying the amount of load to be shed.
IEEE TRANSACTIONS ON POWER SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Ali Rafiee, Yazdan Batmani, Ali Mehrizi-Sani, Toshiji Kato, Hassan Bevrani
Summary: In this article, a multi-input multioutput robust PI controller is designed for zero-level control of ac microgrids. The controller can operate properly in both high and medium frequencies without considerable fluctuations and overshoots at the output. The proposed strategy successfully attenuates adverse effects of unknown disturbances on the load voltage of islanded microgrids.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
