Article
Engineering, Electrical & Electronic
Jiong Li, Yao Sun, Xing Li, Shiming Xie, Jianheng Lin, Mei Su
Summary: This article proposes a current-sensorless control scheme for single-phase UPS inverters under nonlinear load. The information of load current is obtained through adaptive laws, ensuring system security and reliability. By modeling the unknown disturbance of load current using Fourier series, observer-based feedback control and update laws are derived to adjust the coefficients. The stability of the system is extensively analyzed using the Lyapunov approach. Comparative experiments are conducted to verify the effectiveness of the control approaches using simulation and experimental results.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2022)
Article
Energy & Fuels
Mohamad Hnayno, Ali Chehade, Henryk Klaba, Hadrien Bauduin, Guillaume Polidori, Chadi Maalouf
Summary: This paper introduces a new liquid-cooling technology for uninterruptible power supply (UPS) units, combining an air-cooling system with an indirect water-cooling system. The experiments conducted on a 600 kW SOCOMEC UPS validated a 20 K temperature difference profile and demonstrated a thermal efficiency of 82.27% using a water flow rate of 13 l/min. The liquid-cooled UPS reduced the total annual energy consumption of the cooling system by at least 85% compared with an air-cooled UPS.
Article
Computer Science, Information Systems
Faheem Haroon, Muhammad Aamir, Asad Waqar
Summary: This paper proposes a technique combining sliding mode control and composite reaching law for regulating the output voltage of distributed generation systems. By intelligently combining multiple functions, the proposed technique achieves fast convergence of system states and reduces chattering. Experimental results demonstrate the effectiveness of this approach in achieving low harmonic distortion and reduced chattering.
Article
Engineering, Electrical & Electronic
Pei Yong, Ning Zhang, Yaowang Li, Qingchun Hou, Yuxiao Liu, Song Ci, Chongqing Kang
Summary: This paper proposes a novel analytical availability index calculation framework for evaluating power supply adequacy, taking into account the capacity and characteristics of UPS devices, as well as distribution network configuration and protection device placement.
IEEE TRANSACTIONS ON SMART GRID
(2022)
Article
Engineering, Electrical & Electronic
Hyo-Jun Ryu, Jae-Sung Mo, Seung-Cheol Choi, Young-Doo Yoon
Summary: This article proposes a voltage control strategy to improve the disturbance rejection performance during the parallel operation of a multimodular uninterruptible power supply (UPS). The reason for the occurrence of a circulating current is analyzed, and a partial feedforward control technique is proposed to compensate for a portion of the load current. An additional feedforward control technique is also proposed to enhance the disturbance rejection performance. The effectiveness of the proposed control strategy is verified through experimental results.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Jinghang Lu, Mehdi Savaghebi, Bingfu Zhang, Xiaochao Hou, Yao Sun, Josep M. Guerrero
Summary: This article proposes a distributed dynamic event-triggered control method to address the issue of mismatched line resistance in modular online uninterruptible power supply systems and achieve accurate active power and harmonic power sharing. The method adaptsively regulates virtual resistance, reduces communication among neighboring units, and ensures system stability.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Juan Astrada, Cristian De Angelo
Summary: A strategy for implementing output impedance in multi-loop inverters with a double virtual impedance loop has been proposed, which can independently establish DC output impedance while reducing computational cost. The strategy allows for appropriate distribution of load current among parallel inverters while meeting standard requirements.
ELECTRIC POWER SYSTEMS RESEARCH
(2022)
Article
Energy & Fuels
Guisen Ye, Feng Gao, Jingyang Fang
Summary: This paper proposes a mission-driven two-step virtual machine commitment method, which effectively reduces the total power consumption of data centers by considering the characteristics of UPS power losses in virtual machine allocation.
Article
Energy & Fuels
Guisen Ye, Feng Gao, Jingyang Fang
Summary: This paper proposes a mission-driven two-step virtual machine (VM) allocation method to address the issue of data center energy consumption. The method reduces power losses in uninterruptible power supply (UPS) and servers by considering the characteristics of UPS power losses. Simulation results show that the method can effectively decrease total power consumption and reduce search complexity.
Article
Engineering, Electrical & Electronic
Hao Lin, Jianxing Liu, Xiaoning Shen, Jose Ignacio Leon, Sergio Vazquez, Abraham Marquez, Ligang Wu, Leopoldo Garcia Franquelo
Summary: This article proposes a fuzzy sliding-mode control strategy for three-phase three-level neutral-point-clamped active front-end rectifiers. The strategy consists of three control loops: power tracking loop, dc-link voltage regulation loop, and dc-link voltage balancing loop. Experimental results demonstrate the effectiveness and superiority of the proposed strategy.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Leonardo Gobel Fernandes, Alceu Andre Badin, Daniel Flores Cortez, Roger Gules, Eduardo Felix Ribeiro Romaneli, Amauri Assef
Summary: This article proposes a single-phase transformerless online UPS based on new technology, which operates efficiently with ac and dc input sources through switched capacitor operation. It improves power factor, balances dc bus capacitor voltages, and eliminates common mode current, reducing electromagnetic interference issues. Experimental results from a 2.5-kW prototype verify the feasibility with an efficiency of up to 94.9% and unity power factor.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2021)
Article
Engineering, Electrical & Electronic
Hao Lin, Yunfei Yin, Xiaoning Shen, Abraham Marquez, Jianxing Liu, Jose Leon, Sergio Vazquez, Leopoldo G. Franquelo, Ligang Wu
Summary: In this article, a fuzzy logic system-based sliding-mode control strategy is proposed for three-phase three-level neutral-point-clamped power converters, aiming to improve the disturbance rejection ability, dc-link voltage regulation ability, and power tracking ability with good chattering suppression ability.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2022)
Article
Automation & Control Systems
Charles Lorenzini, Luis Fernando Alves Pereira, Alexandre Sanfelici Bazanella, Gustavo R. Goncalves da Silva
Summary: In this article, a simple and model-free procedure based on the generalized forced oscillation method is proposed to design the control system of a UPS output stage. The closed-loop results obtained in a single-phase 3.5 kVA UPS are compared with the IEC 62040-3 performance criteria and shown to be equivalent to model-based approaches.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Energy & Fuels
Guofeng He, Le Zhao, Yanfei Dong, Guojiao Li, Wenjie Zhang
Summary: This paper proposes a novel control strategy based on the theory of virtual synchronous generator (VSG) and dynamic switching method to alleviate the impulsive current in Uninterruptible Power Supply (UPS). The method effectively reduces the distortion of output voltage and ensures the good performance of On-line UPS under impulse load.
Article
Engineering, Marine
Wenjie Tian, Xiangpeng Zhang, Dongpo Lv, Lina Wang, Qi Liu
Summary: In this paper, a new motion control strategy combining sliding mode controller and neural network is proposed for shipborne stable platform. The experimental results show that the control accuracy and stability of the proposed strategy have been significantly improved.
Article
Automation & Control Systems
Ozan Gulbudak, Mustafa Gokdag, Hasan Komurcugil
Summary: This article presents a novel Lyapunov-based model predictive control strategy for squirrel-cage induction motor fed by a voltage source inverter. By reformulating the objective function as the Lyapunov energy function, the proposed method solves the instability issue in traditional model predictive control. Experimental results demonstrate the effectiveness of the proposed method.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Sertac Bayhan, Hasan Komurcugil, Naki Guler
Summary: An effective FCS-MPC method is introduced for controlling a single-phase three-level T-type rectifier supplying resistive and constant power loads. The method is based on Lyapunov's stability theory and eliminates the requirement of weighting factors, making the controller design and implementation easier.
IET POWER ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Naki Guler, Sertac Bayhan, Hasan Komurcugil
Summary: An equal-weighted cost function-based weighting factor tuning method for model predictive control in power converters is proposed in this research. By normalizing values to balance the importance of cost terms, the method equalizes the weights of cost terms, eliminating the necessity of tuning weighting factors. Experimental results demonstrate the excellent performance of the proposed method in practical applications.
IET POWER ELECTRONICS
(2022)
Article
Automation & Control Systems
Ozan Gulbudak, Mustafa Gokdag, Hasan Komurcugil
Summary: This paper introduces an optimized sliding surface predictive control method for a three-phase voltage source inverter. It addresses the difficulty of stability analysis in MPC and proposes a stability-guaranteed objective function design procedure based on sliding-mode control theory.
Article
Chemistry, Multidisciplinary
Hafiz Ahmed, Samet Biricik, Hasan Komurcugil, Mohamed Benbouzid
Summary: This paper proposes a reference signal generation method for the operation of single-phase dynamic voltage restorers and presents a quasi type-1 phase-locked loop for tracking the reference voltage signals. Experimental results demonstrate that this method can quickly detect and compensate for grid voltage anomalies to maintain constant load voltage.
APPLIED SCIENCES-BASEL
(2022)
Article
Automation & Control Systems
Naki Guler, Hasan Komurcugil
Summary: This article introduces energy-function based model predictive control (EF-MPC) for single-phase split source inverters. Unlike conventional MPC methods, the proposed EF-MPC is designed with consideration of the inverter's stability. According to Lyapunov's direct method, the stability of the inverter can be ensured by maintaining a negative derivative of the energy function. The cost function in EF-MPC is designed based on the energy function, which includes errors in dc- and ac-side inductor currents. The coefficient used in the energy function formulation is shown to be redundant, eliminating the need for a weighting factor in the multiobjective cost function. The proposed EF-MPC also suppresses the amplitude of low-frequency components in the dc-side inductor current.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Engineering, Electrical & Electronic
Hasan Komurcugil, Sertac Bayhan, Naki Guler, Haitham Abu-Rub, Farzaneh Bagheri
Summary: A finite-control-set sliding-mode control method is proposed for single-phase three-level T-type inverter-based transformerless dynamic voltage restorers. The method combines the advantages of SMC and FCS concepts to improve control effectiveness and implementation simplicity. Experimental results demonstrate the effectiveness of the proposed method in maintaining load voltage stability.
IET POWER ELECTRONICS
(2022)
Article
Multidisciplinary Sciences
Farzaneh Bagheri, Hasan Komurcugil
Summary: This paper presents an adaptive sliding mode control method with a variable boundary layer for single-phase voltage source inverters. This strategy provides a simple sliding function without any derivative term while maintaining the fast dynamic response and robustness of sliding mode control. It also utilizes the variable boundary layer method to reduce the chattering phenomena. Simulation results in MATLAB/Simulink show that the proposed control technique outperforms other methods with significantly less chattering.
GAZI UNIVERSITY JOURNAL OF SCIENCE
(2023)
Article
Engineering, Electrical & Electronic
Samet Biricik, Hasan Komurcugil, Hafiz Ahmed, Mohammad Sharifzadeh, Majid Mehrasa, Kamal Al-Haddad
Summary: A PR-based current control strategy for grid-connected PEC inverter is proposed in this paper. It achieves zero steady-state error in grid current and eliminates the need for controlling dc capacitor voltages. Grid current synchronization is achieved using a Lyapunov filter-based PLL. Experimental results demonstrate the effectiveness of the proposed control strategy under different conditions.
IET GENERATION TRANSMISSION & DISTRIBUTION
(2023)
Article
Engineering, Electrical & Electronic
Sertac Bayhan, Hasan Komurcugil
Summary: This paper presents a sensorless control strategy for a three-phase multi-level active front-end rectifier with an LCL filter. The proposed strategy eliminates the need for current measurement and does not use any PI controller, simplifying the controller design. Active damping using filter capacitor voltage feedback addresses the resonance damping requirement. Experimental results show that the proposed strategy exhibits good steady-state and dynamic performances under different grid conditions.
IET POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Seyyed Mohammad Javad Mousavi, Ebrahim Babaei, Mehran Sabahi, Hasan Komurcugil
Summary: In this article, a new class of single-phase Z-source ac-ac converters is proposed, which share ground and have continuous input current. These converters have unique features, including buck operation in both in-phase and out-of-phase modes, bidirectionality, minimal component counts, unlimited boost ability without duty cycle limitation, and reduction in switching device power (SDP) parameter. A safe commutation strategy is applied to eliminate voltage and current spikes on the switches. Experimental results confirm the performance of the laboratory prototype of the proposed converters.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Automation & Control Systems
Yanyang Lu, Hamid Reza Karimi, Hasan Komurcugil
Summary: This paper focuses on the measurement outlier-resistant mobile robot localization problem using multiple Doppler-azimuth radars under round-robin protocol (R-RP). By constructing a time-varying state estimator with a saturation function, the influence of outliers can be mitigated. The paper aims to find a practical and effective solution by devising the estimator, which satisfies the given H∞ performance index.
Article
Engineering, Electrical & Electronic
Farzaneh Bagheri, Samet Biricik, Hafiz Ahmed, Hasan Komurcugil
Summary: This paper presents an extended state observer (ESO)-based second-order sliding mode control (SMC) method for dynamic voltage restorers (DVRs). The proposed method can alleviate chattering and achieve finite-time convergence, unlike conventional first-order SMC and some second-order SMC methods. Chattering suppression is achieved through continuous control input and pulse width modulation signals are generated using the same input. An active disturbance rejection (ADR) based on an ESO is proposed to enhance performance when subjected to disturbances. Additionally, an advanced single-phase phase-locked loop (PLL) using linear observer and quasi-type-1 PLL is proposed. Simulation and experimental results validate the effectiveness of the proposed method compared to existing SMC methods applied to DVR.
IET POWER ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Ozan Gulbudak, Mustafa Gokdag, Hasan Komurcugil
Summary: This study presents a novel Lyapunov-based model predictive control strategy for a nine-switch inverter-based multi-drive system, which effectively improves the closed-loop stability and steady-state characteristic compared to the conventional MPC method.
INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS
(2023)
Article
Automation & Control Systems
Hasan Komurcugil, Sertac Bayhan, Naki Guler, Haitham Abu-Rub
Summary: This article presents a new exponential reaching law (ERL) approach for sliding mode control, which achieves faster reaching time without using a sign function. An expression of reaching time in terms of reaching law gains is derived. The stability of the proposed reaching law is proven. Experimental results confirm the efficacy of the proposed reaching law for controlling a 5-kW three-phase multilevel multifunction converter under fast-changing nonlinear load currents.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
