Review
Engineering, Electrical & Electronic
Qianwen Xu, Navid Vafamand, Linglin Chen, Tomislav Dragicevic, Lihua Xie, Frede Blaabjerg
Summary: In DC microgrids, advanced control technologies are necessary to address the challenges brought by constant power loads and pulsed power loads. These technologies include model predictive control, backstepping control, sliding-mode control, passivity-based control, disturbance estimation techniques, intelligent control, and nonlinear modeling approaches. Furthermore, these techniques can also be applied in other high-power applications.
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
George Gkizas
Summary: This paper discusses the design and robust control synthesis of a two-stage cascaded DC-DC boost converter, with an optimization approach for component selection and an LMI-based formulation for state-feedback control laws. The veracity of the design and controller synthesis is validated through numerical simulations and experimental results.
CONTROL ENGINEERING PRACTICE
(2021)
Article
Energy & Fuels
Abhiram V. P. Premakumar, Yang-Yang Qian, Mohammadreza Davoodi, Yan Wan, Ali Davoudi
Summary: Power buffers are dc-dc converters with large capacitors that provide inertia during microgrid transients. They are placed before the point-of-load converter, which regulates the load voltage. By controlling the input impedance of the power buffer, the impact of abrupt load changes on the resistive dc network is mitigated.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2023)
Article
Energy & Fuels
Jiarong Wu, Lin Yang, Zhenkun Lu, Qingyu Wang
Summary: This paper presents a robust adaptive composite control strategy to improve the performance and stability of a boost converter with constant power loads (CPLs) in DC microgrids. The strategy includes two control loops and utilizes affine nonlinear mathematical models, differential geometry theory, exact feedback linearization theory, sliding mode control method, and proportional-integral control technology.
Article
Automation & Control Systems
Huiming Wang, Zhize Zhang, Ching-Yen Weng, Xianlun Tang
Summary: This article investigates the voltage regulation of a dc-dc buck converter with current constraint and proposes a robust finite-time control scheme that combines finite-time disturbance observer and finite-time control techniques for maintaining satisfactory dynamic performance and disturbance rejection.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Kevin E. Lucas, Daniel J. Pagano, David Alejandro Vaca-Benavides, Ronald Garcia-Arcos, Erick M. Rocha, Renan L. P. Medeiros, Sara J. Rios
Summary: This article introduces the design and evaluation of robust controllers based on linear programming, Kharitonov's theorem and Chebyshev's theorem to enhance the performance and stability of a multistage converter system in dc systems. The controllers overcome instability issues caused by constant power load, ensuring system reliability and robust control performance.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Jingjing Qi, Xuezhi Wu, Shan He, Wenzheng Xu, Jingdou Liu
Summary: This paper investigates the operation characteristics of wide-range cascaded buck converter and proposes a control strategy to achieve high efficiency and rapid dynamic regulation.
IET POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Xiaoran Dai, Guo-Ping Liu, Qijun Deng, Wenbin Zeng
Summary: This article proposes a global optimal cooperative control strategy to improve the poor dynamic consensus in multiple dc-dc converter systems caused by parameter differences. The proposed control strategy achieves dynamic consensus of output currents by minimizing a global performance index, and introduces integral action and nonlinear coordinate transformation techniques to improve coordinated performance. Proof of stability and consensus is provided using Lyapunov approach, and design guidelines for tuning dynamic response are given through simulations.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Automation & Control Systems
Arezoo Vafamand, Navid Vafamand, Jafar Zarei, Roozbeh Razavi-Far, Tomislav Dragicevic
Summary: This article introduces a novel multiobjective controller for power converters in a dc microgrid, using the nondominating sorting binary genetic algorithm. The controller aims to minimize tracking error and reduce switching actions, achieving desired reference tracking with reduced power loss. By utilizing the NSBGA-II algorithm, switching frequency can be included in the design process for enhanced performance.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Automation & Control Systems
Qingyu Su, Chenglong Li, Xinxin Guo, Xinquan Zhang, Jian Li
Summary: This paper proposes an effective system for fault detection and fault identification in DC-DC Boost converters, which is validated through theoretical analysis, simulation, and experimental verification. The key of the method is to design a robust linear switch fault detection observer and a set of fault recognition observers, achieving adaptive parameter identification.
CONTROL ENGINEERING PRACTICE
(2021)
Article
Engineering, Electrical & Electronic
Hossein Gholizadeh Narm, Suzan Eren, Masoud Karimi-Ghartemani
Summary: In this article, a fast and robust control system is introduced for a buck converter to efficiently stabilize a dc bus with constant power loads (CPLs). The proposed controller utilizes the internal converter dynamics and eliminates the integrating term commonly used in literature, resulting in a simple yet robust structure and performance. A two-step algorithm is presented for the controller design, which only requires two parameters. Detailed analysis, simulations, and experimental results confirm the desired performance and superiority of the proposed controller over a state-of-the-art controller.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Zhuang Liu, Xinpo Lin, Yabin Gao, Ruiqi Xu, Jiahui Wang, Yijie Wang, Jianxing Liu
Summary: This paper investigates the fixed-time control problem of DC-DC buck converter systems with mismatched disturbances. Sliding mode fixed-time observers are constructed to estimate the matched and mismatched disturbances, and a novel segmented terminal sliding mode control variable considering the mismatched disturbances is designed. Additionally, a new second-order fixed-time reaching law is proposed to improve the tracking performance. A novel fixed-time nonsingular TSMC method based on the fixed-time observers is proposed to achieve accurate control in a fixed-time independent of the initial state. Comparative experiments are conducted to validate the effectiveness and practicality of the proposed control strategy.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
(2023)
Article
Engineering, Multidisciplinary
Aniket Joshi, Sukumar Kamalasadan
Summary: In this article, an uncertainty-based optimal control framework is proposed to improve the frequency regulation of a distributed microgrid. The framework updates the penalty factor of the controller quality function automatically and provides policy to the hybrid energy storage system (HESS). The HESS supports a photovoltaic distributed energy resource during grid dynamics, and the penalty factor update is based on the sensitivity of battery and ultracapacitor power contribution to frequency change. The proposed architecture provides around 50% improvement in frequency regulation compared to the conventional frequency droop approach.
IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS
(2022)
Article
Energy & Fuels
Hossein Sartipizadeh, Farnaz Harirchi, Mohammad Babakmehr, Payman Dehghanian
Summary: The DC-DC Floating Interleaved Boost Converter (FIBC) is introduced to convert low-level voltage generated by renewable energy sources to high-level voltage required for AC inverters. Designing a proper voltage gain for FIBC is challenging due to uncertainties, such as variations in input voltage caused by parameters like external load. A robust model predictive control is used to regulate the output voltage despite uncertainties, eliminating the need for individual tuning for each converter. This approach is demonstrated to be superior to non-robust model predictive framework in simulations.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2021)
Article
Thermodynamics
Feixiang Jiao, Yuan Zou, Xudong Zhang, Bin Zhang
Summary: This paper proposes a two-stage optimal framework for the online dispatch of a grid-connected DC microgrid, aiming to address the uncertainties of renewable energy and load demand. The framework includes a power coordination model and a charging station allocation model, and its superiority is validated through numerical case studies.
Article
Engineering, Multidisciplinary
Yundong Tang, Jian Zou, Rodolfo C. C. Flesch, Tao Jin
Summary: This study develops a poroelastic model to evaluate the effect of syringe needle size and infusion rate on backflow. The results demonstrate that tissue deformation and infusion pressure are the fundamental reasons for obtaining an irregular solution distribution.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Electrical & Electronic
Yundong Tang, Hang Su, Tao Jin, Rodolfo Cesar Costa Flesch
Summary: Magnetic nanofluid hyperthermia (MNH) is a method that uses magnetic nanoparticles (MNPs) exposed to an alternating magnetic field to generate heat and damage malignant cells. This study proposes a control method for an MNH system using a proportional-integral-derivative (PID) control algorithm and dynamically optimizing the PID coefficients with a simulated annealing (SA) algorithm. The proposed system effectively modulates the power dissipation of MNPs and accurately regulates the treatment temperature to the desired value, while also adapting to changes in the nanofluid concentration distribution during therapy.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Zhongyi Zhang, Xiaosen Xiao, Wei You, Haibin Li, Tao Jin
Summary: A novel bidirectional wider range of boost-buck three-level LCC resonant converter is proposed, which combines the LCC resonant tank module with a particular three-level coupling cascaded neutral point clamping active bridges. The converter can establish forward LCC and backward SRC working modes to maintain a unified wider bidirectional voltage gain range between the input and output. A unified bidirectional boost-buck voltage gain matching control strategy is designed to achieve soft-switching and reduce reactive power losses.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Tao Jin, Huiqing Song, Daniel Legrand Mon-Nzongo, Paul Gistain Ipoum-Ngome, Huangzheng Liao, Minlong Zhu
Summary: This article proposes a virtual three-level model predictive flux control method to improve the performance of driving induction motors fed by a two-level converter. The method utilizes virtual vector method, direct torque control, and novel deadbeat control strategies to reduce flux and torque ripples and computational burden.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Paul Gistain Ipoum-Ngome, Daniel Legrand Mon-Nzongo, Rodolfo Cesar Costa Flesch, Jinquan Tang, Tao Jin, Mengqi Wang, Chunyan Lai
Summary: This article proposes a multiobjective model-free predictive control strategy (MO-MFPC) for multilevel cascaded H-bridge (MLCHB) inverters with unbalanced conditions. The compensated current variation (CCV) is generalized to improve the accuracy of MFPC over a wide range of applications. CMV is added to the cost function to achieve a better tradeoff between current accuracy and injected CMV. Simulations and experimental evaluations demonstrate that MO-MFPC achieves better current accuracy compared to existing MFPCs and classic model predictive control for MLCHB inverters.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yuzhen Xu, Xiangyang Dai, Zhongyi Zhang, Zhiwei Kang, Tao Jin
Summary: The bidirectional full-bridge CLLC resonant converter has the advantages of soft switching of primary and secondary side switches and bidirectional power transmission. However, under light-load conditions in pulse frequency modulation control, the converter suffers from disadvantages of output voltage imbalance and low transmission efficiency. To overcome these issues, a novel phase-shift pulsewidth modulation method is proposed in this article, which achieves low voltage gain regulation and low operation losses under light load. Through time domain analysis considering parasitic parameters and dead time of the switches, the voltage gain of the proposed control method is accurately studied under light load. Finally, an experimental prototype of the bidirectional full-bridge CLLC resonant converter is designed and verified to show the effectiveness of the proposed control method under light-load operation.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Yulong Liu, Ding Yuan, Zheng Gong, Tao Jin, Mohamed A. Mohamed
Summary: In this paper, an adaptive spectral trend-based optimized empirical wavelet transform (EWT) method is proposed to analyze Multiple Power Quality Disturbances (MPQDs). By fitting the upper and lower envelopes of the signal frequency spectrum and calculating the main frequency components, the spectrum can be accurately segmented and disturbance parameters can be monitored with high precision. The algorithm is computationally simple and its effectiveness is verified.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Physics, Applied
Yundong Tang, Yuesheng Wang, Rodolfo C. C. Flesch, Tao Jin
Summary: Magnetic fluid hyperthermia damages malignant cells by maintaining the therapeutic temperature within a specific range after exposing magnetic nanoparticles (MNPs) to an alternating magnetic field. This study compares the classic Pennes bio-heat transfer equation with a porous heat transfer model and evaluates the thermal damage degree for malignant tissue using two different thermal dose methods. The effect of porosity and blood perfusion rates on treatment temperature and thermal dose is also assessed.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Salisu Abdullahi, Tao Jin
Summary: The traditional MPC design heavily relies on the discretization of the nonlinear model to approximate the DC microgrid system. This paper proposes a centralized controller design to ensure bounded DC bus voltage estimation error. The system model is constructed from DC/DC power converters and translated into a deterministic model, with the LKFM employed for voltage estimation. The proposed approach is validated using Simulink and compared with conventional control approaches.
SIMULATION MODELLING PRACTICE AND THEORY
(2023)
Article
Engineering, Electrical & Electronic
Salisu Abdullahi, Tao Jin
Summary: In this paper, an improved finite control set model predictive control (FCS-MPC) is proposed to provide a detailed stochastic model of DC Microgrid (DC MG) through validations. The linear Kalman filtering algorithm (LKFA) is used to approximate the model and handle the real-time information required for the proposed approach. The effectiveness of the improved FCS-MPC is evaluated through Simulink simulation and real-time validation.
ELECTRIC POWER COMPONENTS AND SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Xidong Zheng, Feifei Bai, Zhiyuan Zhuang, Tao Jin
Summary: This study developed a new methodology for hierarchical power allocation strategy that takes into account wind power fluctuation. The proposed method combines Quartile Method and Hampel-Savitzky Golay strategy and effectively reduces the probability of severe volatility while ensuring power allocation within the ideal interval.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Green & Sustainable Science & Technology
Xidong Zheng, Feifei Bai, Zhiyuan Zhuang, Zixing Chen, Tao Jin
Summary: This paper presents a novel prediction-smoothing based methodology to reduce and eliminate the influence caused by the uncertainty of renewable energy output. The Whale Optimization Algorithm (WOA) is combined with Long Short-Term Memory (LSTM) to predict short-term wind power output. The proposed methodology creates a special connection between DRM and renewable energy prediction, which provides a reliable reference for future work.
Article
Engineering, Electrical & Electronic
Yulong Liu, Ding Yuan, Hongwei Fan, Tao Jin, Mohamed A. Mohamed
Summary: As the proportion of power electronics-related facilities increases in modern power systems, the types of power quality disturbances (PQDs) become more complex. This article proposes a multidimensional feature-driven ensemble model that can accurately classify complex PQDs by considering both spatial features in the time-frequency domain and temporal relational features. The model has been thoroughly tested on synthetic and real datasets, demonstrating its effectiveness and robustness compared to existing deep learning-based methods.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Energy & Fuels
Sheng Zhou, Minlong Zhu, Jiaqi Lin, Paul Gistain Ipoum-Ngome, Daniel Legrand Mon-Nzongo, Tao Jin
Summary: This paper proposes a discrete space vector modulation and optimized switching sequence model predictive controller for three-level neutral-point-clamped inverters in grid-connected applications. The proposed strategy improves performance without weighting factor and maintains a total harmonic distortion of current to be less than 2%.
PROTECTION AND CONTROL OF MODERN POWER SYSTEMS
(2023)