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T-S Fuzzy-Based Load Frequency Control of Multiarea Power System With Hybrid Delays: Performance Analysis and Improvement

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IEEE TRANSACTIONS ON FUZZY SYSTEMS 2024年第12期32卷 6939-6950页

作者： Yuan, Zhe-Li Zhang, Chuan-Ke Shangguan, Xing-Chen Fan, Yu-Long He, Yong China Univ Geosci Sch Automat Wuhan 430074 Peoples R China Hubei Key Lab Adv Control & Intelligent Automat Co Wuhan 430074 Peoples R China Minist Educ Engn Res Ctr Intelligent Technol Geoexplorat Wuhan 430074 Peoples R China

Load frequency control (LFC) is crucial for ensuring the frequency stability of power system, and its control performance is often affected by nonlinearities in devices and multisource-induced hybrid delays in control signal transmission networks. This article investigates the LFC performance analysis and improvement of power systems under the nonlinearities and hybrid delays. First, the nonlinear part is approximated by a Takagi-Sugeno (T-S) fuzzy model and the hybrid delay is divided into two regions, thus establishing a T-S fuzzy LFC model with hybrid delays. Then, based on switched system theory, a delay-dependent weighted H-infinity performance analysis criterion for LFC system is proposed, giving the necessary conditions to achieve a certain robustness of the system against disturbances. On this basis, a controller design method is proposed to ensure the system have the optimal level of disturbance rejection under the designed controller. Finally, case studies based on single-area and three-area LFC demonstrate that, compared with previous methods, the proposed method can obtain a larger allowable upper bound of delays and better H-infinity performance estimation. Based on this, the designed controller enhances the robust performance of LFC, thereby ensuring the stable operation of power systems under nonlinearities and hybrid delays.

关键词： Delays Frequency control Power system stability Hybrid power systems Valves Performance analysis Generators Design methodology Analytical models Upper bound Hybrid delays load frequency control (LFC) robust control Takagi-Sugeno (T-S) fuzzy model

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Fast LADRC-Type Phase-Locked Loop With Adaptive Extended state Observer

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IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS 2024年第8期71卷 8268-8278页

作者： Liu, Qi Zhang, Li Qian, Qiang Hohai Univ Coll Energy & Elect Engn Nanjing 211100 Peoples R China

Synchronous reference frame phase-locked loop (SRF-PLL) is widely used in grid-tied applications because of its simple control loop structure. Compared with PI-type SRF-PLL, the linear active disturbance rejection control (LADRC)-type SRF-PLL can achieve better performance under nonideal grid conditions. However, balancing fast dynamic response and good disturbance rejection capability is still difficult. Moreover, no comparative analysis of several existing typical LADRC-type SRF-PLLs has been reported yet. Therefore, the typical LADRC-type SRF-PLL structures are compared and analyzed in detail as well as control parameters tuning. In addition, a modified LADRC-type SRF-PLL with an adaptive extended state observer is proposed. It can achieve both fast dynamic response and good disturbance rejection capability. Finally, simulation and experimental results are carried out to validate the effectiveness of the proposed modified LADRC-type SRF-PLL.

关键词： Extended state observer (ESO) linear active disturbance rejection control (LADRC) control PI control synchronization synchronous reference frame phase-locked loop (SRF-PLL)

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Typology and working mechanism of a hybrid power router based on power-frequency transformer electromagnetic coupling with converters

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Protection and Control of Modern Power Systems 2023年第3期8卷 80-96页

作者： Jinmu Lai Xin Yin Xianggen Yin Jiaxuan Hu Fan Xiao School of Electrical and Information Engineering Zhengzhou UniversityZhengzhou 450001Henan ProvincePeople’s Republic of China School of Automation Wuhan University of TechnologyWuhan 430070Hubei ProvincePeople’s Republic of China School of Electrical and Electronic Engineering Huazhong University of Science and Technology(HUST)Wuhan 430074Hubei ProvincePeople’s Republic of China State Grid Hubei Electric Power Research Institute Wuhan 430077Hubei ProvincePeople’s Republic of China

The power router(PR)is a promising piece of equipment for realizing multi-voltage level interconnection and flex-ible power control in the future distribution power *** this paper,a hybrid PR(HPR)topology based on power-frequency transformer electromagnetic coupling with converters is proposed for the medium distribution power *** power-frequency transformer is used to undertake power transmission,voltage conversion,and other main tasks,while the power electronic converters are combined to achieve active *** magnetic and electrical circuit models are established to help discuss the operating principle of the proposed ***,the power flow and control principle of the HPR in different operating conditions are analyzed,with the control system design scheme *** theoretical analysis results are verified by MATLAB/Simulink+Plecs simulation and a controller hardware-in-the-loop study,as well as a down-scale experimental test,indicating that the proposed HPR is flexible in active voltage support and current control.

关键词： Power router Power-frequency transformer Power electronic converter Hybrid Working mechanism

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A Remote Calibration Device Using Edge Intelligence

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SENSORS 2022年第1期22卷 322-322页

作者： Wang, Quan Li, Hongbin Wang, Hao Zhang, Jun Fu, Jiliang Huazhong Univ Sci & Technol Sch Elect & Elect Engn Wuhan 430074 Peoples R China China Elect Power Res Inst Co Ltd Wuhan 430074 Peoples R China State Key Lab Adv Elctromagnt Engn & Technol Wuhan 430074 Peoples R China Natl Inst Metrol Beijing 100029 Peoples R China

Power system facility calibration is a compulsory task that requires in-site operations. In this work, we propose a remote calibration device that incorporates edge intelligence so that the required calibration can be accomplished with little human intervention. Our device entails a wireless serial port module, a Bluetooth module, a video acquisition module, a text recognition module, and a message transmission module. First, the wireless serial port is used to communicate with edge node, the Bluetooth is used to search for nearby Bluetooth devices to obtain their state information and the video is used to monitor the calibration process in the calibration lab. Second, to improve the intelligence, we propose a smart meter reading method in our device that is based on artificial intelligence to obtain information about calibration meters. We use a mini camera to capture images of calibration meters, then we adopt the Efficient and Accurate Scene Text Detector (EAST) to complete text detection, finally we built the Convolutional Recurrent Neural Network (CRNN) to complete the recognition of the meter data. Finally, the message transmission module is used to transmit the recognized data to the database through Extensible Messaging and Presence Protocol (XMPP). Our device solves the problem that some calibration meters cannot return information, thereby improving the remote calibration intelligence.

关键词： remote calibration device edge intelligence text recognition CRNN power system

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High-Order Generalized Integrator ESO-Based PLL Considering Time-Varying Disturbances

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IEEE TRANSACTIONS ON POWER ELECTRONICS 2024年第1期39卷 101-105页

作者： Liu, Qi Zhang, Li Zhang, Wei Hohai Univ Coll Energy & Elect Engn Nanjing 211100 Peoples R China

Phase-locked loop (PLL) is essential for grid-tied applications. Generalized integrator (GI) extended state observer-based PLL (GIESO-PLL) stands out among disturbance observer-based PLLs due to the excellent periodic disturbance rejection capability. However, the system dynamic response is deteriorated by employing GI units. To this end, a high-order GIESO-based PLL is proposed to consider various grid time-varying disturbances. Theoretical analysis and experimental results proved that the proposed PLL achieves good dynamic performance and strong disturbance rejection capability.

关键词： Active disturbance rejection control extended state observer (ESO) generalized integrator (GI) synchronization

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Efficient fabrication of polyamide-quartz wrapped yarns with enhanced wear resistance and mechanical properties

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TEXTILE RESEARCH JOURNAL 2025年

作者： Li, Qingyang Zhang, Wenlu Chen, Yunna Li, Wenbin Wuhan Text Univ State Key Lab New Text Mat & Adv Proc Technol Wuhan Peoples R China Wuhan Text Univ Sch Text Sci & Engn Wuhan Peoples R China

The high brittleness of ceramic fibers represents a significant bottleneck that restricts the performance of these materials. In this study, to improve the performance of quartz yarn, high wear resistance polyamide-quartz wrapped hybrid yarns were prepared using a hollow-spindle spinning process, with polyamide filaments as the outer layer. The influence of the wrapped structure and wrapping density on the wear resistance and tensile properties of the hybrid yarn were studied in detail. Compared with the single-wrapped structure, an X-type double-wrapped structure, with opposing twist directions, significantly reduced friction damage to the quartz core yarn. When the wrapping density for both single- and double-wrapped yarns was set to 400 twists/m, the tensile properties of the polyamide-quartz wrapped yarns reached optimal performance, with the breaking load of the hybrid yarn increased by 14.57% and 11.80%, respectively, compared with the quartz yarn. These aforementioned polyamide-quartz hybrid yarns, when utilized to produce high wear-requiring materials, such as specialized sewing threads, exhibit excellent wear and break resistance, significantly broadening the application possibilities for quartz yarns.

关键词： Structure-properties spinning strength fiber yarn fabric formation testing high performance fibers

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A review of secondary contamination of drinking water quality in distribution systems: sources, mechanisms, and prospects

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AQUA-WATER INFRASTRUCTURE ECOSYSTEMS AND SOCIETY 2025年第1期74卷 118-141页

作者： Wang, Zhi Yang, Xiaozhou Fu, Lei Li, Manjie Tsinghua Univ Shenzhen Int Grad Sch Shenzhen 518055 Peoples R China Tsinghua Univ Shenzhen Key Lab Adv Technol Marine Ecol Shenzhen 518055 Peoples R China Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China

Drinking water that complies with established standards at treatment plants inevitably undergoes secondary contamination upon entering distribution systems. A bibliometric analysis highlights the expanding body of research on drinking water distribution systems (DWDSs), emphasizing the paramount importance of safeguarding drinking water quality and mitigating secondary contamination within these networks. This study delves into the sources, health implications, and mitigation strategies pertaining to three predominant forms of secondary contamination, namely metal release, microbial regrowth, and disinfectant by-product (DBP) formation, as well as the intricate interactions among these contaminants. The release of heavy metals is inherently linked to the corrosion process of metallic components of pipelines, which is affected by water quality and hydraulic dynamics. Microbial regrowth within DWDSs is potentially associated with the reproduction of waterborne pathogens, which can lead to significant health outcomes including acute gastroenteritis and diarrhea. Consequently, disinfection is commonly employed to prevent pathogen proliferation in DWDSs, whereas the residual disinfectants can react with natural organic matter or halogen ions in waters, resulting in the formation of DBPs. To mitigate the adverse effects of DBPs, various practical interventions are implemented at distinct stages of water distribution, encompassing source control, process control, and end control. HIGHLIGHTS A review of secondary contamination of water quality in distribution systems. A bibliometric analysis of extant research. A comparative analysis of water quality standards across various entities. A discussion on the relationship among various types of contaminations.

关键词： disinfection by-product formation drinking water distribution systems heavy metal release microbial regrowth secondary contamination

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Fault Identification Method of Transformer Winding based on Gramian Angular Difference Field and Convolutional Neural Network

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RECENT ADVANCES IN ELECTRICAL & ELECTRONIC engineering 2024年第8期17卷 837-847页

作者： Yang, Shihao Li, Zhenhua Yang, Xinqiang Wu, Hairong China Three Gorges Univ Coll Elect Engn & New Energy Yichang 443002 Peoples R China

Background As the frequency of transformer winding faults becomes higher and higher, the frequency response analysis used to detect the winding status has attracted more and more attention. At present, there is still a lack of reliable and intelligent technologies for detecting the state of transformer windings in this *** This paper focuses on studying a high-precision method for transformer fault diagnosis, which can be easily and effectively applied to daily *** By changing the detection method, the traditional detection method can not distinguish the problem that the detection data are highly overlapping when identifying the same fault of the head and tail symmetric points, and the problem that the phase is too similar is changed. In order to solve the problem that the fault samples of transformer frequency response curve are scarce and the one-dimensional data cannot be read by partial deep learning method, the one-dimensional data of frequency response curve is first converted into characteristic index and then into a three-dimensional image by moving window calculation method and Gramian Angular difference field transformation. The fault classification is realized by a convolutional neural *** The accuracy of the final model for slice classification reached 100%.Conclusion Illustrative examples show that the method is distinguishable from different fault types. The traditional method only uses the amplitude of the frequency response curve, but this method displays the two features of the amplitude-phase together in the image. Compared with the traditional method, more features and samples are added to further improve the accuracy of the method. The accuracy of diagnosis results reached 100%, which showed the feasibility of the method.

关键词： Transformer winding fault diagnosis gramian angular difference field convolutional neural network moving windows frequency response

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Radiation effects on Kevlar fibers through high energy electron beam

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POLYMER engineering AND SCIENCE 2023年第9期63卷 3083-3090页

作者： Chen, Wentao Qi, Wei Du, Jifu Zhao, Long Huazhong Univ Sci & Technol Semicond Chem Ctr Sch Chem & Chem Engn Hubei Key Lab Bioinorgan Chem & Mat Med Wuhan Peoples R China Hubei Univ Sci & Technol Sch Nucl Technol & Chem & Biol Xianning Peoples R China Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan Peoples R China Huazhong Univ Sci & Technol Semicond Chem Ctr Sch Chem & Chem Engn Hubei Key Lab Bioinorgan Chem & Mat Med Wuhan 430074 Peoples R China Huazhong Univ Sci & Technol Sch Elect & Elect Engn State Key Lab Adv Electromagnet Engn & Technol Wuhan 430074 Peoples R China

The Kevlar fibers were irradiated at up to 2500 kGy using a 10 MeV electron accelerator. The effects of radiation on the Kevlar fibers were evaluated in detail. The main structure, crystal structure, and thermal transition temperature of the fibers remained unchanged after electron beam radiation. The mechanical properties of the fibers decreased significantly when the absorbed dose reached 2000 kGy. In addition, viscosity tests revealed that electron beam radiation could damage the long polymer chains of the fibers. The FTIR results showed that the intensity of the C-N bond decreased depending on the absorbed dose, indicating that C-N bonds may be the degradation site of Kevlar fibers. This work provides a comprehensive radiation resistance evaluation for Kevlar fibers and thus offers some fundamental data for the application of Kevlar fibers in extreme environments.

关键词： electron beam Kevlar fibers radiation stability

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Equivalent circuit model of grid-forming-converter based power grids: Visualizing control loop interactions on synchronization stability

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INTERNATIONAL JOURNAL OF ELECTRICAL POWER & ENERGY SYSTEMS 2025年 168卷

作者： Yang, Saizhao Ma, Rui Wen, Jinyu Cheng, Shijie Shandong Univ Sch Elect Engn Jinan 250061 Shandong Peoples R China Eindhoven Univ Technol Dept Elect Engn NL-5600 MB Eindhoven Netherlands Huazhong Univ Sci & Technol Sch Elect & Elect Engn Wuhan 430074 Hubei Peoples R China

For grid-forming (GFM) converter-based power grids, the impacts of AC voltage control (ACVC) loops on smallsignal synchronization stability are rarely discussed in literature. To present the interactions between the synchronization control loop and the ACVC loop in an intuitive and clear approach, this paper establishes the equivalent circuit model of multi-GFM-converter based power systems, and analyzes the impacts of control loop interactions on small-signal synchronization stability. Firstly, the model of multi-GFM converter-based power grids has been established that incorporates the ACVC loop. Then, for the further visualization of control loop interactions, equivalent circuits of the whole systems are derived by the analogy-based method. This analysis allows us to assess the impacts of the ACVC on small-signal synchronization stability. This paper illustrates that ACVC can be equivalently represented as a negative impedance in parallel with the filter inductor. In this case, the ACVC brings about negative damping effects and deteriorates small-signal synchronization stability. Furthermore, the control parameters of the ACVC on small-signal synchronization stability are also quantitatively evaluated. Additionally, interactions between different GFM converters on small-signal synchronization stability are also investigated. Finally, the modified IEEE 10-GFM-converter 39-bus system is built in MATLAB/Simulink platform to validate analyzes and the proposed method.

关键词： Grid-forming control Synchronization stability Equivalent circuit model AC voltage control Interactions

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