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37th International Conference on Lightning Protection, ICLP 2024

作者： Zhao, Zeyang Liu, Yakun Xiao, Cien Wei, Zhenyu Xie, Minqi Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Department of Electrical Engineering Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9783800764174

Measurement on the impedance of multidirectional carbon fiber reinforced polymer (CFRP) is obstructed by the real-time action of lightning impulse currents on test samples. Most studies compromised to using direct currents/DC to probe CFRP impedance, leaving evident misrepresentation and even deficiency in consideration of the permeation flow, tunneling effects, and field-induced emission to high voltage. This work conducts impedance measurement of CFRP under the real-time simulated lightning impulse currents. A new test sample contact-fixture device is designed. Through proposing an equivalent multidirectional circuit model, impedance in CFRP fiber direction, in-plane perpendicular fiber direction, and thickness direction can be deduced. Results are verified with the thermoelectric coupling model in CFRP lightning damage, together with experimental findings. Parameters acquired by the DC method are also compared and it indicates that accuracy of in-plane damage prediction is improved by 16.3% with this proposed approach, and increased by 24.8% for the depth direction. This study can help refine predictive models of CFRP damage to lightning strikes. © 2024 IEEE, © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Carbon fiber reinforced plastics

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A High-Sensitivity Current Differential Protection for Renewable Energy Station 3

A High-Sensitivity Current Differential Protection for Renew...

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3rd International Conference on power Systems and Electrical Technology, PSET 2024

作者： Zhou, Wei Zhang, Jindao He, Chaofan Han, Zhengqian Lan, Chen Zhang, Huaiyu Zheng, Xiaodong State Grid Shanghai Chongming Electric Power Supply Company Shanghai China Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai China

ISBN: (纸本)9798350353204

With the integration of large-scale renewable energy, the fault characteristics of the renewable energy outgoing line have undergone significant changes, leading to the sensitivity decrease or even rejection of traditional ratio restraint current differential protection. Through rewriting the protection criterion and constructing the composite sequence network during fault, this paper investigates the mechanism of decreased performance of traditional current differential protection in fault scenarios with small amplitude ratio and large phase angle difference of co-phase current. Furthermore, a modified protection criterion is constructed by adjusting the amplitude relationship of differential current and braking current. Finally, this paper builds the simulation model in PSCAD/EMTDC, and verifies the high sensitivity of proposed protection which contributes to research on protection performance improvement in the form of modifying criterion. © 2024 IEEE.

关键词： current differential protection high sensitivity outgoing line renewable energy station

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Unified Implicit Z-bus power flow Solver for Hybrid AC/DC Distribution Networks 20

Unified Implicit Z-bus Power flow Solver for Hybrid AC/DC Di...

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20th International Conference on AC and DC power transmission 2024, ACDC 2024

作者： Tian, Peichuan Jin, Yexuan Hao, Peng Wang, Chengmin Key Laboratory of Control of Power Transmission and Conversion of Ministry of Education Shanghai Jiao Tong University Shanghai China State Grid Hangzhou Power Supply Company Hangzhou China

ISBN: (纸本)9781837242672

In the future power system, characterized by the massive integration of distributed energy resources (DERs), the AC/DC hybrid network represents a highly promising technology that will play a crucial role at power distribution levels. As essential analytical tools for AC/DC distribution networks, Newton-Raphson (N-R) based unified AC/DC power flow methods have been developed and widely used. However, the N-R method encounters challenges such as divergence, multiple solutions, and high sensitivity to initial values when solving power flow problems in distribution networks, particularly in radial and meshed distribution network topologies, especially under conditions of high R/X ratios or heavy loads. To address these issues, this paper presents a novel unified AC/DC power flow algorithm based on the implicit Z-bus (IZB) method. Considering the various combinations of nodes and feeders in AC/DC hybrid distribution networks, a unified power flow solver based on an IZB iterative mapping is proposed. Numerical tests validate the proposed solver, demonstrating its superior capability to achieve high computational efficiency while reliably converging to feasible solutions without being influenced by the choice of high R/X ratios, initial values, and heavy loads. © The Institution of Engineering & Technology 2024.

关键词： power distribution networks

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A Cost-Oriented Score Evaluation Index to Align Probabilistic Forecasting and Uncertain Decision-Making in power Systems

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IEEE Transactions on power Systems 2025年第2期40卷 1981-1984页

作者： Yan, Xinyue Zhang, Haipeng Li, Ran Wan, Can Nengling, Tai Sun, Yongchao Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai200240 China Shanghai Jiao Tong University College of Smart Energy Shanghai200240 China Ministry of Education Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai200240 China Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai200240 China Zhejiang University College of Electrical Engineering Hangzhou310027 China Southwest Branch of State Grid Corporation of China Chengdu610095 China

Existing research has shown the inconsistency between point forecasting and deterministic optimization, yet the consistency between probabilistic forecast indices and uncertain optimization has not been investigated. This letter fills this gap by undertaking scenario-based tests to reveal the mismatch and proposing a new cost-oriented score (COS) to indicate whether a probabilistic forecast can lead to a "better"decision-making performance in unit commitment and economic dispatch. © 1969-2012 IEEE.

关键词： Costs Probabilistic logic Forecasting Uncertainty Decision making Standards Indexes Optimization Predictive models Real-time systems

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A Distributed Frequency Support control Strategy for Offshore Wind Farm Integration System via DRU-HVDC 2

A Distributed Frequency Support Control Strategy for Offshor...

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2nd IEEE International power Electronics and Application Symposium, PEAS 2023

作者： Zhang, Zhichao Yu, Haotian Cai, Xu Feng, Wenxin Ren, Xinfang Ma, Xianghui Guangzhou Bureau Csg Ehv Power Transmission Company Guangzhou China Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai China

ISBN: (纸本)9798350313765

Along with the increasing scale of offshore wind farms (OWFs), the low-cost and lightweight characteristics of diode rectifier unit-based high voltage direct current (DRU-HVDC) integration technology have attracted much attention. Due to its large integration scale, the need for providing frequency support (FS) has arisen. Some FS control strategies for DRU-HVDC integrated wind turbines (WTs) have been proposed, but all of them more or less depend on the communication system. Thus, the communication-dependent FS control strategies are not conducive to the stability and economy of the system. Therefore, the distributed FS control strategy for DRU-HVDC integrated OWF is proposed. Furthermore, the efficacy of the proposed FS control strategy has been verified by PSCAD/EMTDC. © 2023 IEEE.

关键词： communication less frequency response control DRU-HVDC offshore wind power generation

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A Modulation Method to Realize Soft Switching for Three-Phase Matrix AC-DC Converter 2

A Modulation Method to Realize Soft Switching for Three-Phas...

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2nd IEEE International power Electronics and Application Symposium, PEAS 2023

作者： Zhu, Zhicheng Li, Rui Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai China

ISBN: (纸本)9798350313765

This paper presents a new modulation method to realize soft switching for three phase matrix AC-DC converter (TPMC). TPMC can provide direct ac to dc transform between the grid and the dc source or loads without the traditional dc-link capacitors, thus increasing power density significantly. It is a basic requirement of TPMC to realize the soft switching especially MOSFET of ac side. The first part reviews the existing modulation method for TPMC. Then the topology of TPMC is analyzed. Combined with current space vector modulation, a soft switching modulation method is proposed. Based on this analysis, the 3kW, 220V rms three-phase ac to 600V dc prototype is built in PLECS, which verifies the feasibility of the proposed modulation method. © 2023 IEEE.

关键词： ac-dc power conversion soft switching SVPWM TPMC

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Analysis of Vibration Characteristics of Electro-hydraulic Driven 3-UPS/S Parallel Stabilization Platform

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Chinese Journal of Mechanical Engineering 2024年第6期37卷 212-224页

作者： Xiaoming Yuan Weiqi Wang Haodong Pang Lijie Zhang Hebei Key Laboratory of Heavy Machinery Fluid Power Transmission and Control Yanshan UniversityQinhuangdao 066004China Key Laboratory of Advanced Forging&Stamping Technology and Science Ministry of EducationYanshan UniversityQinhuangdao 066004China

With the development of fluid-power transmission and control technology,electro-hydraulic-driven technology can significantly improve the load-carrying capacity,stiffness,and control accuracy of stabilization ***,compared with mechanically driven platforms,the stiffness and damping of the fluid,as well as the coupling effect between the fluid and the structure need to be considered for electro-hydraulic-driven parallel stabilization platforms,making the modal and dynamic response characteristics of the mechanism more *** the aim of solving the aforementioned issues,we research the electro-hydraulic driven 3-UPS/S parallel stabilization platform considering the hinge ***,the characteristic vibration equation of the mechanism is established using the virtual work ***,the variation characteristics of the natural frequency and the vibration response according to the position of the mechanism are analyzed based on the dynamic ***,the correctness of the model is verified by a modal test and Runge-Kutta *** study provides a theoretical basis for the dynamic design of electrohydraulic-driven parallel mechanisms.

关键词： Electro-hydraulic driven 3-UPS/S parallel stabilization platform Kinetic equation Vibration mode Vibration response Modal test

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Resilience-Constrained Planning of Energy Hub Considering Waste Heat Reuse of Data Center 8

Resilience-Constrained Planning of Energy Hub Considering Wa...

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8th International Conference on power and Renewable Energy, ICPRE 2023

作者： Jin, Wenguang Zhang, Shenxi Sun, Tong Cheng, Haozhong Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai China

ISBN: (纸本)9798350328813

In recent years, extreme natural disasters such as typhoons, earthquakes and floods have caused serious disruptions to energy supplies, raising awareness of the threat of extreme events. In this paper, a novel resilience-constrained planning method for the energy hub (EH) is proposed, in which the waste heat from the data center (DC) is used to improve the resilience of the EH against seismic events. First, the EH model and resilience analysis methodology are introduced based on the energy bus, in which the tight coupling of various energy devices before and after seismic events can be described conveniently. Then, the model of DC is formulated from various aspects, i.e., computing process, thermodynamic process, multi-energy consumption, waste heat reuse, service quality. On this basis, the resilience-constrained planning model of EH is established. Case studies indicate that the waste heat reuse of DC can enhance the resilience of EH to extreme seismic events. © 2023 IEEE.

关键词： data center energy hub planning resilience seismic events waste heat reuse

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A Parameter Design Method for DRU-HVDC Integrated Offshore Wind Farm Concerning System Harmonic and Resonance Characteristics 2

A Parameter Design Method for DRU-HVDC Integrated Offshore W...

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2nd IEEE International power Electronics and Application Symposium, PEAS 2023

作者： Ren, Xinfang Yu, Haotian Cai, Xu Feng, Wenxin Zhang, Zhichao Peng, Guangqiang Csg Ehv Power Transmission Company Guangzhou Bureau Guangzhou China Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai China

ISBN: (纸本)9798350313765

The diode rectifier unit-based high voltage direct current (DRU-HVDC) integration scheme has gradually become popular for large-scale offshore wind farms (OWFs) due to its advantages in terms of low cost and lightweight. However, the traditional grid-following (GFL) control strategies of wind turbines (WTs) cannot be used since DRU lacks the grid-forming ability. Therefore, the current research mainly focuses on the grid-forming (GFM) control strategies for WTs to establish the offshore grid. However, the harmonic and resonance characteristics of the offshore grid receive relatively less attention. Accordingly, this paper proposes a parameter design method for the circuit and WTs' control parameters by considering system harmonic and resonance characteristics. Furthermore, simulation results based on PSCAD/EMTDC have been provided to verify the effectiveness of the proposed design method. © 2023 IEEE.

关键词： DRU-HVDC harmonic characteristics parameter optimization resonance stability

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Equilibrium control Strategy for Twelve-Phase Permanent Magnet Motor control System

Equilibrium Control Strategy for Twelve-Phase Permanent Magn...

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2023 International Conference on Marine Equipment and Technology and Sustainable Development

作者： Gao, Congzhe Huang, Wentao Tai, Nengling Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China

ISBN: (纸本)9789819942909

Twelve-phase permanent magnet synchronous motors (PMSM) are widely used in high-power ship propulsion and have a wide range of application prospects. In this paper, we take the twelve-phase permanent magnet propulsion system with multi-channel control technology as the research object and study the balanced drive method under the motor grouping control mode. A mathematical model of 12-phase PMSM under dq-axis coordinate is established to analyze the motor power output capability and establish the equalization control relationship between different groupings to ensure the equalization of output voltage of four sets of windings of permanent magnet synchronous motor. Simulations and experiments on the balanced operation of the 12-phase PMSM are conducted to verify the effectiveness of the proposed balanced control strategy, which can be balanced between different sets of windings when the motor starts with unbalanced winding power, and is more suitable for multi-phase motor drive systems with high requirements for the balanced voltage and current of 12 phases. © 2023, Harbin Engineering University.

关键词： Permanent magnets

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