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4th International Conference on Energy, power and electrical engineering, EPEE 2024

作者： Zhou, Tianji Lou, Yantao Sun, Xiaoping He, An Yang, Liu Wu, Yue Tsinghua University Department of Electrical Engineering Beijing China Xi'an Xidian Power System Co. Ltd. Department of Dc Research Xi'an China Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China

ISBN: (纸本)9798331518066

The rapid growth of clean energy has increased the demand for rectifier power supplies in hydrogen production, particularly in the megawatts (MW) and kiloamperes (kA) range. The Multilevel Current Source Converter (MCSC), a modular and multilevel topology with high power quality, is suitable for high-current applications but faces challenges, notably current balancing among submodules (SMs). This paper analyzes the causes of current imbalance and proposes a closed-loop control strategy using module current feedback and modulation index adjustment to maintain balanced current across the 2 N DC ports in a MCSC formed by N SMs. Finally, Simulation results in MATLAB/Simulink confirm the effectiveness of the proposed current balancing control strategy. © 2024 IEEE.

关键词： Closed loop control systems

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A Multilevel Current Source Converter with 19kA Output Capacity for Large-Scale Hydrogen Electrolyzer

A Multilevel Current Source Converter with 19kA Output Capac...

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2024 IEEE Energy Conversion Congress and Exposition, ECCE 2024

作者： Zhou, Tianji Zhao, Biao Yantao, Lou Xiaoping, Sun He, An Yang, Liu Wu, Yue Tang, Xueteng Tsinghua University Department of Electrical Engineering Beijing China Xi'an Xidian Power System Co. Ltd. Department of Dc Research Xi'an China China Southern Power Grid State Key Laboratory of Hvdc Electric Power Research Institute Guangzhou China

ISBN: (纸本)9798350376067

Multilevel current source converter (MCSC) is a modular topology suitable for buck-type continuously adjustable high output current rectifier application, realizing high controllability, high scalability, high reliability and low cost, which is suitable for large-scale hydrogen electrolyzer power supply. This paper presents the topology of IGBT-based MCSC and highlights its superiority over the existing electrolyzer power supply topologies. Design considerations are outlined to achieve low distortion AC current, low ripple DC current and a compact design of submodule (SM) is also introduced. The experiment scheme, realizing rated output and full-power operation, is presented. Additionally, a 19kA/6.65MW hydrogen electrolyzer power supply prototype based on MCSC is demonstrated to validate the performance, supported by experiment waveforms and results. © 2024 IEEE.

关键词： Topology

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Research on a New Integrated Device for Remote control of power Cable Testing and Cutting

Research on a New Integrated Device for Remote Control of Po...

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2024 Boao New power system International Forum - power system and New Energy Technology Innovation Forum, NPSIF 2024

作者： Cao, Kangyangyong Xing, Hongquan Zhang, Yilin Xue, Chuan Li, Feiyi Gao, Ziyang State Grid Changchun Power Supply Company Changdian Group Cable Engineering Branch Jilin Changchun130000 China State Grid Changchun Power Supply Company Operation Maintenance Department Jilin Changchun130000 China Northeast Electric Power University Engineering Training and Teaching Center Jilin Jilin132011 China Jilin Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Jilin132011 China

ISBN: (纸本)9798331504557

With the continuous improvement and development of urban power grid structures, it is inevitable that cable lines will need to be renovated and replaced. In the process of cable construction, the traditional cable cutting process involves independent operations, requiring a large amount of equipment and occupying a large area. Workers need to wear protective clothing when cutting, which is inflexible and inefficient. This approach is no longer adequate for the diverse and complex construction sites of today. To this end, a new type of integrated power cable cutting device is specially designed and developed, which combines testing and cutting, reducing the use of cable cutting tools. The newly developed circuit cutter is designed with features such as compact size, high structural strength, good cutting effect, strong adaptability, and remote control function. It can significantly improve the safety and convenience of cable cutting operations, which is of positive significance for improving construction quality and efficiency and ensuring the personal safety of operators. © 2024 IEEE.

关键词： Remote control

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Evaluating The Aggregated Frequency Regulation Capability of Energy Storage Clusters 7

Evaluating The Aggregated Frequency Regulation Capability of...

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7th IEEE Conference on Energy Internet and Energy system Integration, EI2 2023

作者： Xiang, Jiaxiong Yang, Bo Wang, Shibo Zhang, Zhi Pei, Zheyi Li, Kecheng Zhou, Guangqi Zhou, Ming North China Electric Power University State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources Beijing China China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems Beijing China State Grid Shandong Electric Power Research Institute Jinan China State Grid Corporation of China Beijing China China Electric Power Research Institute Beijing China

ISBN: (纸本)9798350345094

With the integration of a large number of wind and solar new energy power generation into the power grid, the system faces frequency security issues. Energy storage stations (ESS) can effectively maintain frequency stability due to their ability to quickly adjust power. Due to the differences in the state of each ESS and the topology of the power grid, it is difficult to evaluate the frequency support capability of the energy storage cluster (ESC) in real-time. This paper proposes a real-time evaluation model for the aggregated frequency support capability of ESC. The evaluation indicators for inertia support and primary frequency regulation (PFR) capability is proposed respectively. Considering the aggregation effect of ESC, the evaluation of frequency support ability for ESC is transformed into an optimization problem. This article establishes evaluation models for the inertia support capability and primary frequency regulation capability of ESC, respectively. In the evaluation model, we establish frequency response models for ESS based on virtual inertia and droop control, considering the differences in the states of each ESS and network security constraints. The case study shows that the model can evaluate the frequency support capability of energy storage clusters based on their real-time status. When considering network constraints, the supporting capacity of ESC exhibits spatial distribution characteristics. © 2023 IEEE.

关键词： Energy storage

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A Preliminary Study on the Application of Large Language Models in power system Simulations

A Preliminary Study on the Application of Large Language Mod...

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International Conference on power and Energy Technology (ICPET)

作者： Xinwei Sun Yunyang Xu Tannan Xiao Han Diao Shaowei Huang Bo Zhou Wei Wei State Grid Sichuan Electric Power Research Institute Chengdu China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (数字)9798350375855

ISBN: (纸本)9798350375862

The digital update of power systems requires the support of intelligent application systems. Therefore, this paper investigates the utilization of a cutting-edge artificial intelligence technology called the Large Language Model (LLM) in power system simulations. The study provides a comprehensive overview of the key techniques employed in developing advanced simulation applications using LLMs, including retrieval-augmented generation and chain-of-thought prompting. Moreover, the paper showcases the development of two intelligent simulation applications on the CloudPSS, which is a high-performance cloud simulation platform for energy internet. The process of application development is described in detail, and the operational outcomes are presented to demonstrate the initial validation of the LLM's ability to initiate simulation tools and generate simulation codes.

关键词： Cloud computing Codes Large language models power system simulation power system dynamics Retrieval augmented generation Robustness power industry Security Protection

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Bi-Level Coordinated Expansion Planning of High-Pv-Penetration Active Distribution Networks Incorporating Multiple Flexible Resources Considering Wgan-Gp-Based Uncertainty Generation

SSRN

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SSRN 2024年

作者： Li, Jianjing Sun, Kai Sun, Bo Li, Fan School of Control Science and Engineering Shandong University Jingshi Road 17923 Jinan250061 China State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China

Integrating high-penetration random photovoltaics (PVs) into the active distribution network (ADN) often causes overvoltage issues, which can even trigger ADN failures. To accommodate high-penetration PVs integration while maintaining economic efficiency and flexibility of ADN, a bi-level collaborative expansion planning model considering uncertainty generation and reduction is proposed. Based on described uncertainty scenarios of PV and load obtained by proposed Wasserstein Generative Adversarial Network with Gradient Penalty and K-means method, upper level firstly configures soft open points to adjust the ADN topology, then optimizes the siting and sizing of PVs, electric vehicle charging stations, energy storage systems, and active management resources (on-load tap changers, and static var compensators) with minimum investment cost. Lower level uses multi-objective mixed-integer second-order cone programming (MISOCP) model with network loss, PV curtailment and voltage deviation of different attributes to optimize ADN scheduling. To solve this planning model, a hybrid algorithm combining adaptive particle swarm optimization algorithm and SOCP with the technique for order preference by similarity to an ideal solution is presented. Finally, the presented model was tested in actual rural 41-bus and urban 40-bus ADN of Gansu, China, demonstrating that total costs decreased by 14.4% and 12.5% respectively compared to plans without active management resources. © 2024, The Authors. All rights reserved.

关键词： Particle swarm optimization (PSO)

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Variable Frequency Phase-Shift Modulation Technique for Single Stage Dual-Active-Bridge AC-DC Converter 11

Variable Frequency Phase-Shift Modulation Technique for Sing...

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11th International Conference on power Electronics - ECCE Asia, ICPE 2023-ECCE Asia

作者： Guo, Dongxin Wang, Panbao Ren, Chunguang Guerrero, Josep M. Harbin Institute of Technology School of Electrical Engineering and Automation Harbin China Taiyuan University of Technology Shanxi Key Lab. of Power System Operation and Control Taiyuan China Aalborg University Department of Energy Technology Aalborg Denmark

ISBN: (纸本)9788957083505

This article proposes a variable frequency phase-shift modulation technique for single stage dual-active-bridge (DAB) AC-DC converter. This isolated single-stage single-phase converter consists of a DAB and a full bridge (FB) inverter. The proposed strategy applies a composite control strategy combining frequency modulation and extended phase shift (EPS) method to overcome the drawback of the non-linear power control of traditional phase-shift control scheme, which significantly reduces the complexity of the controller algorithm. Moreover, the synchronous inverter control applied to the back-end FB inverter is designed, which can realize the energy conversions in a single-stage, and a high frequency (HF) filter capacitor can replace the electrolytic capacitor at the output side DC-link. Thus, the safety of system operation improves and the power density of the system increases. Finally, simulation results confirm the validity and practical feasibility of the proposed control strategy. © 2023 The Korean Institute of power Electronics.

关键词： Electrolytic capacitors

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Electric Field Distribution Analysis During the Very Fast Transient Process Based on 3D Full Maxwell Simulation 4th

Electric Field Distribution Analysis During the Very Fast Tr...

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4th International Conference on power and electrical engineering, ICPEE 2023

作者： Sun, Qiang Gao, Wensheng Zhang, Ziwei Nie, Hongyu Lu, Guiyou He, Yufeng Qu, Jiaqi Department of Electrical Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China Sichuan Energy Internet Research Institute Tsinghua University Chengdu China Ultra High Voltage Branch State Grid Sichuan Electric Power Company Chengdu China School of Instrumentation and Optoelectronic Engineering Beihang University Beijing China

ISBN: (纸本)9789819716739

Most simulations of electric field distribution during the very fast transient (VFT) process are based on equivalent waveforms, which affects the analysis of the electric field. In this paper, the actual VFT process is simulated based on the 3D full Maxwell finite element method (FEM). The electric field distribution at different points is measured. To investigate the influence of the induced electric field during the VFT process, and whether high amplitude or high steepness is the main factor affecting insulation during the VFT process, the simulation results are compared with the electrostatic simulation results. The results show that the induced electric field caused by the wave process does not play an important part. The electric field distribution is hardly influenced by the induced electric field. Therefore, the threat to insulation caused by VFTO is mainly due to its high amplitude, which leads to a stronger Coulomb electric field. Besides, the wave process only leads to a 6~8% voltage amplitude increase, which is much lower than the amplitude increase due to externally generated low-frequency oscillations. Therefore, the high amplitude of VFTO is mainly caused by low-frequency oscillations, rather than the high-frequency components during the VFT process. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Electric fields

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Building a Large-Scale Intrinsically-Safe Energy Storage system by Using Retired EV Batteries

Building a Large-Scale Intrinsically-Safe Energy Storage Sys...

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International Conference on power Electronics systems and Applications (ICPESA)

作者： Congjia Zhang Qi Yu Yanglin Zhou Yuxin Li Baochang Liu Ende Lin Song Ci Department of Electrical Engineering Tsinghua University Beijing China China Three Gorges Corporation Wuhan China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

ISBN: (数字)9798350365801

ISBN: (纸本)9798350365818

Utilizing retired batteries in energy storage systems (ESSs) poses significant challenges due to their inconsistency and safety issues. The implementation of dynamic reconfigurable battery networks (DRBNs) is promising in maintaining the reliability and safety of battery energy storage systems (BESSs). Recently, large-scale BESSs based on DRBN have been deployed with the use of retired batteries, but the operational performance of these systems in real-world working conditions still remains uncertain. To bridge the research gaps, a case analysis is conducted based on the operational data from a real-world large-scale retired BESS. First, the framework of the retired BESS and the structure of the DRBN are illustrated in detail. Then, the core principle of DRBN is comprehensively demonstrated in terms of energy digitization and time-oriented battery management mode. Finally, the operational results indicate that the ESS can effectively improve the voltage and capacity consistency of battery modules and realize efficient thermal management to improve systematic safety of the retired BESS.

关键词： Thermal management of electronics systematics Battery management systems Voltage Thermal management Thermal conductivity Batteries

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Distributed Real-time state Estimation for Combined Heat and power systems

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Journal of Modern power systems and Clean Energy 2021年第2期9卷 316-327页

作者： Tingting Zhang Wen Zhang Qi Zhao Yaxin Du Jian Chen Junbo Zhao the Key Laboratory of Power System Intelligent Dispatch and Control Ministry of EducationShandong UniversityJinan 250061China the Department of Electrical and Computer Engineering Mississippi State UniversityStarkvilleMS 39762USA

This paper proposes a distributed real-time state estimation(RTSE)method for the combined heat and power systems(CHPSs).First,a difference-based model for the heat system is established considering the dynamics of heat *** heat system model is further used along with the power system steady-state model for holistic CHPS state estimation.A cubature Kalman filter(CKF)-based RTSE is developed to deal with the system nonlinearity while integrating both the historical and present measurement ***,a multi-timescale asynchronous distributed computation scheme is designed to enhance the scalability of the proposed method for largescale *** distributed implementation requires only a small amount of information exchange and thus protects the privacy of different energy *** carried out on two CHPSs show that the proposed method can significantly improve the estimation efficiency of CHPS without loss of accuracy compared with other existing models and methods.

关键词： Combined heat and power system(CHPS) cubature Kalman filter(CKF) heat dynamics multi-time-scale asynchronous distributed scheme real-time state estimation(RTSE)

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