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11th China International Conference on Electricity Distribution, CICED 2024

作者： Xue, Yinjuan Chen, Qifang Cai, Haiqing Xia, Mingchao Gu, Haohan School of Electrical Engineering Beijing Jiaotong University Beijing China State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid Guangzhou China National Energy Power Grid Technology R&d Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350368345

With the rapid proliferation of Electric Vehicles (EV s), effectively leveraging the regulation potential of EV charging loads has become a prominent issue. This paper proposes a multi-type EV schedulability modeling method based on the analysis of charging behavior characteristics of different user types. The model comprehensively considers the charging characteristics of various types of EV s, including private cars, ride-hailing vehicles, and taxis, utilizing a charging start-stop probability distribution model. Case studies demonstrate that this model can not only accurately reflect the charging demands of EV s but also provide valuable references for strategies involving EV fleet participation in grid regulation. © 2024 IEEE.

关键词： Charging stations

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Optimization Strategy for Virtual Energy Storage of Electric Vehicles to Participate in Multiple Ancillary Services 5

Optimization Strategy for Virtual Energy Storage of Electric...

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5th International Conference on Clean Energy and Electric power Engineering, ICCEPE 2024

作者： Guo, Qi Gu, Haohan Zhao, Yifei Tu, Liang Chen, Qifang Cai, Haiqing Chen, Wei Chen, Zhihao Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China School of Electrical Engineering Beijing Jiaotong University Beijing100044 China

ISBN: (纸本)9798350390315

When EVs participate in multiple ancillary services of the power grid, due to the lack of a unified management scheduling plan, various ancillary service demands compete for limited energy storage resources. This would lead to conflicts when the virtual energy storage of EV participates in the regulation of multiple ancillary services. In order to solve the above problems, a reasonable and feasible optimization strategy for virtual energy storage of EVs is formulated to alleviate the conflict problems of ancillary services. The validity of the proposed method is verified by simulation cases. © 2024 IEEE.

关键词： control strategies electric vehicles multiple auxiliary services

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The Influence of Oil Temperature on the Content of Dissolved Gases in Oil Under Partial Discharge Conditions

The Influence of Oil Temperature on the Content of Dissolved...

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International Conference of electrical, Electronic and Networked Energy systems, EENES 2024

作者： Gao, Jie Huang, Meng Qi, Bo Deng, Xianqin Chen, Chuan State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources North China Electric Power University Beijing China State Grid Smart Grid Research Institute Co. LTD Beijing China State Grid Shanghai Municipal Electric Power Company Shanghai China

ISBN: (纸本)9789819618637

As a primary means of diagnosing long-term latent faults in transformers, dissolved gas analysis (DGA) can effectively guide transformer fault diagnosis and condition assessment through the analysis of dissolved gas content and proportions in oil. To investigate the gas generation patterns of transformers with local overheating and partial discharge faults under different temperatures, a test platform for simulating gas generation patterns in oil-paper insulation with controllable oil temperature was established. Oil samples were collected at different time points during the fault development process for DGA, providing information on the characteristic gas generation in the oil-paper insulation system under varying oil temperatures. The results indicate that oil temperature has a significant impact on the generation and dissolution of characteristic gases during surface discharge in oil-paper insulation. Methane remains the most active hydrocarbon gas, while carbon dioxide and hydrogen are the primary products. Carbon monoxide and ethylene concentrations exhibit relatively stable changes. Acetylene concentration fluctuates significantly with temperature. Increasing oil temperature may lead to a decrease in the concentration of certain gases. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Oil filled transformers

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Research on the Balance Control Method of Instantaneous power for the Converter in D-PMSG

Research on the Balance Control Method of Instantaneous Powe...

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2022 International Conference on Energy and electrical power systems, ICEEPS 2022

作者： Feng, Ruming Minfu, A. Gao, Chen Yan, Xu Liu, Taowei Yang, Zaixin Zhang, Wei Co. Ltd. Inner Mongolia Power Research Institute Branch Huhhot Inner Mongolia010000 China Inner Mongolia Enterprise Key Laboratory of High Voltage and Insulation Technology Huhhot Inner Mongolia010000 China Inner Mongolia Power Research Institute Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Huhhot Inner Mongolia010000 China

This paper establishes a numerical model of wind power generation system. The low voltage ride-through characteristics of direct-driven wind turbines in case of grid failure are studied. By comparing the measured data with the numerical data, the correctness, validity and the numerical simulation results for the grid-connected operation of the direct-drive wind turbine generator set proposed in this paper are verified. © Published under licence by IOP Publishing Ltd.

关键词： Synchronous generators

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Research on the Influence of Wind power Access on Voltage Stability of Distribution Network

Research on the Influence of Wind Power Access on Voltage St...

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2022 International Conference on Energy and electrical power systems, ICEEPS 2022

作者： Gao, Chen Feng, Ruming Wang, Yuqiang Yan, Xu Wu, Xiaoqian Han, Tao Li, Qi Co. Ltd. Inner Mongolia Power Research Institute Branch Huhhot Inner Mongolia010000 China Inner Mongolia Power Research Institute Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Huhhot Inner Mongolia010000 China Inner Mongolia Enterprise Key Laboratory of High Voltage and Insulation Technology Huhhot Inner Mongolia010000 China

This paper proposes a voltage stability index suitable for distributed generation and distribution network which is derived by using the relationship between power balance and voltage balance and the impact of wind power access location, access capacity, and fault on the voltage stability. The results show that the shorter the length and the larger the wind power capacity, the more obvious its role in supporting the distribution network voltage. But the greater the negative impact of wind power's instability on the distribution network voltage, the above factors must be comprehensively considered in network planning. © Published under licence by IOP Publishing Ltd.

关键词： Electric power distribution

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Analytical Representation of Data-driven Transient Stability Constraint and Its Application in Preventive Control

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Journal of Modern power systems and Clean Energy 2022年第5期10卷 1085-1097页

作者： Yiwei Fu Xiaohua Zhang Lei Chen Zengyao Tian Kaiyuan Hou Haikuan Wang State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical EngineeringTsinghua UniversityBeijing 100084China State Grid Jibei Electric Power Company Beijing 100053China Northeast China Branch of State Grid Corporation of China Shenyang 110180China

Accurate transient stability assessment(TSA) and effective preventive control are important for the stable operation of power systems. With the superiorities in precision and efficiency, data-driven methods are widely used in TSA nowadays. Data-driven TSA model can be adopted in the stability constraints of preventive control optimization, but existing methods are mostly iteration-based ones, which may result in low efficiency, sometimes even non-convergence. In this paper,an analytical representation method of data-driven transient stability constraint is proposed based on a non-parametric regression model built for TSA. key feature extraction and dominant sample selection are proposed to reduce the scale of the TSA model, and bi-level linearization is applied to further modify *** preventive control model is then formulated as a mixed-integer linear program(MILP) problem with the linearized analytical data-driven transient stability constraint, which can be solved without iterations. An overall procedure of datadriven TSA and preventive control is finally developed. Case studies show that the proposed method has high accuracy in TSA and can achieve effective preventive control of power system with high efficiency.

关键词： Data-driven critical clearing time transient stability constraint non-parametric regression optimal preventive control

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Research on typical operating conditions of hydrogen production system with off-grid wind power considering the characteristics of proton exchange membrane electrolysis cell

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Global Energy Interconnection 2024年第5期7卷 642-652页

作者： Weiming Peng Yanhui Xu Gendi Li Jie Song Guizhi Xu Xiaona Xu Yan Pan State Key Lab of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityChangping DistrictBeijing 102206P.R.China State Grid Smart Grid Research Institute Co. Ltd.Changping DistrictBeijing 102209P.R.China Huairou Laboratory Huairou DistrictBeijing 101499P.R.China

Hydrogen energy,with its abundant reserves,green and low-carbon characteristic,high energy density,diverse sources,and wide applications,is gradually becoming an important carrier in the global energy transformation and *** this paper,the off-grid wind power hydrogen production system is considered as the research object,and the operating characteristics of a proton exchange membrane(PEM)electrolysis cell,including underload,overload,variable load,and start-stop are *** this basis,the characteristic extraction of wind power output data after noise reduction is carried out,and then the self-organizing mapping neural network algorithm is used for clustering to extract typical wind power output scenarios and perform weight distribution based on the statistical *** trend and fluctuation components are superimposed to generate the typical operating conditions of an off-grid PEM electrolytic hydrogen production *** historical output data of an actual wind farm are used for the case study,and the results confirm the feasibility of the method proposed in this study for obtaining the typical conditions of off-grid wind power hydrogen *** results provide a basis for studying the dynamic operation characteristics of PEM electrolytic hydrogen production systems,and the performance degradation mechanism of PEM electrolysis cells under fluctuating inputs.

关键词： Wind power fluctuation Off-grid operation Hydrogen production by PEM electrolysis Neural network clustering Typical working conditions

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Identifiability Analysis of Load Model Parameters by Estimating Confidential Intervals

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CSEE Journal of power and Energy systems 2023年第5期9卷 1666-1675页

作者： Xinran Zhang Chao Lu Ying Wang Qiantu Ruan Hongbo Ye Weihong Wang the School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China. the State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua UniversityBeijing 100084China School of Technology Beijing Forestry UniversityBeijing 100083China the State Grid Shanghai Electric Power Company Shanghai 200122China

The identification of load model parameters from practical measurement data has become an essential method to build load models for power system simulation,analysis and *** practical situations,the accuracy of the load model parameters identification results is impacted by data quality and measurement accuracy,which leads to the problem of *** this paper,an identifiability analysis methodology of load model parameters,by estimating the confidential intervals(CIs)of the parameters,is *** load model structure and the combined optimization and regression method to identify the parameters are first ***,the definition and analysis method of identifiability are *** CIs of the parameters are estimated through the profile likelihood method,based on which a practical identifiability index(PII)is defined to quantitatively evaluate ***,the effectiveness of the proposed analysis approach is validated by the case study results in a practical provincial power *** results show that the impact of various disturbance magnitudes,measurement errors and data length can all be reflected by the proposed ***,the proposed PII can provide guidance in data length selection in practical load model identification situations.

关键词： Confidential interval Load modeling parameter estimation practical identifiability

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Analysis and suppression of voltage oscillation at DC circuit breaker terminal in DC fault transient process

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High Voltage 2022年第6期7卷 1194-1203页

作者： Hong Shen Xianrui Huang Lei Qi Xiangyu Zhang Xiaojun Ni Peng Qiu Xiaoguang Wei Xiang Cui State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina Electric Power Research Institute State Grid Zhejiang Electric Power CompanyHangzhouChina State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd.BeijingChina

High-frequency voltage oscillation occurs at the initial stage of DC short-circuit fault in the modular multilevel converter(MMC)-based high-voltage direct-current systems,which directly threatens the reliable operation of the secondary equipment in DC circuit breakers(DCCBs).Therefore,this paper focusses on the voltage oscillation characteristic at DCCB terminals,considered the stray parameters of connecting lines,the parasitic parameters of main equipment and the impedance of grounding grid,established equivalent circuit models of MMC-HVDC converter station at the initial stage of pole-topole and pole-to-ground fault,and obtained the analytical formula for the voltage oscillation ***,the comparison with the DC short-circuit test data of�200 kV MMC-HVDC converter station verified the validity of the models and revealed the mechanism of voltage ***,the influence of the parameters of the converter station on the oscillation characteristics was *** was proposed to install the DCCB at the MMC valve's terminal near the DC side,and the oscillation frequency is about 10–60 kHz,which is more than 5 times lower than that at the DC reactor's terminal near the DC pole bus,and the disturbance of oscillation to DCCB was alleviated.

关键词： oscillation. oscillation transient

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The electrical-Thermal Coupling simulation of Grafted Polypropylene Used in High-Voltage Direct Current Cables 4th

The Electrical-Thermal Coupling Simulation of Grafted Polypr...

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4th International Symposium on Insulation and Discharge Computation for power Equipment, IDCOMPU 2023

作者： Fan, Yazhou Zhang, Wenjia Peng, Xiangyang Huang, Shangshi Li, Yinge Hu, Shixun Li, Qi He, Jinliang Guangdong Power Grid Company Limited Electricity Research Institute Guangzhou510062 China Department of Electrical Engineering The State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing100084 China

ISBN: (纸本)9789819974122

Under direct current (DC) operation conditions, local electric field in insulation layer will be distorted, leading to insulation failure. Since the conductivity of insulating materials generally corresponds positively with temperature, a temperature gradient will form inside the insulating material during cable operation, making the conductivity distribution uneven and causing the "electric field reversal" phenomenon in the cable insulation layer. The distribution of the electric field and temperature field of the polypropylene grafted as the cable insulation under the electric heating-coupling field is yet to be studied. Studies have proved that by grafting modification the insulating properties of materials can be improved. This paper studied the and conductivity characteristics of grafted polypropylene materials, and selected one type for more experiments to obtain the material's conductivity-temperature-electric field strength characteristic equation through data fitting. A model of a 100 kV DC cable was established in COMSOL, and simulation of the cable section’s electric heating-coupling field was performed, revealing the temperature and electric field distribution inside the insulation layer when the cable is rated, overloaded, or short-circuited. This paper can provide some reference for operational analysis of polypropylene-insulated HVDC cables. © Beijing Paike Culture Commu. Co., Ltd 2024.

关键词： Polypropylenes

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