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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Deng, Baojia Chao, Xianzong Jiang, Xinghai Zeng, Fuping Li, Long Yao, Qiang Electric Power Research Institute of State Grid Chongqing Electric Power Company Chongqing400000 China State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan430072 China

ISBN: (纸本)9789819618514

Erbium-doped fiber amplifier (EDFA), as a key device in the photoacoustic spectroscopy gas detection system, has a large impact on the system performance. Therefore, in this paper, we take CO as the target gas and study in detail the influence of EDFA on the second harmonic signal and the system noise value. In order to avoid the interference of CO2 and H2O in the air, we choose a laser with a center wavelength of 1567.3249 nm. On this basis, a CO photoacoustic spectroscopy detection system with EDFA as the core was constructed. The second harmonic output signals and system noise signals under different EDFA output powers were investigated when the light source was wavelength modulated. The results show that the amplitude of the second harmonic signal increases gradually from 0.5 W to 2 W of EDFA output power. The two are linearly positively correlated with a correlation coefficient of 0.996. The system noise also increases significantly from 0.5 W to 2 W, but the two are nonlinearly correlated. The maximum value of the detection system signal-to-noise ratio and the minimum value of the minimum detection lower limit are both at 1.5 W, which are 756.93 and 66.05 ppm, respectively. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Erbium doped fiber amplifiers

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Emergency control methods for power systems based on improved deep reinforcement learning 6

Emergency control methods for power systems based on improve...

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2024 6th International Conference on Artificial Intelligence Technologies and Applications, ICAITA 2024

作者： Zhang, Jie Zhu, Yihua Liang, Zhuohang Ma, Qinfeng Zhang, Qingqing Liu, Mingshun An, Su Pu, Qingxin Dai, Jiang State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangdong Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangdong Guangzhou510663 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangdong Guangzhou510663 China Power Dispatching and Control Center of Guizhou Power Grid Co. Ltd. Guizhou Guiyang550000 China

In order to achieve fast and accurate transient stability analysis and emergency control, this paper proposes a transient stability emergency control method based on improved deep reinforcement learning. In order to fully explore the temporal and spatial variation trend of transient response, a multi-dimensional feature containing information such as transient situation energy is constructed, and the deep reinforcement learning model is transformed based on the time-space graph neural network. On this basis, an emergency control model is constructed, and the power grid knowledge is integrated into the emergency control decision-making scheme to reduce the exploration of invalid decision-making and improve the performance of the model. The effectiveness of the proposed method is verified in the IEEE-39 system. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Deep reinforcement learning

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Partial Discharge Characteristics of the Metal-insulation Interface under Repetitive ¼s Pulse Voltage

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年第3期32卷 1451-1459页

作者： Yu, Menghan Yang, Lanjun Wu, Jian Cheng, Lin Xi'An Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Shaanxi Xi'an710049 China State Grid Shaanxi Province Electric Power Research Institute Shaanxi Xi'an China

This study investigates the discharge characteristics of the metal-insulation interface under repetitive frequency pulse voltage by examining partial discharge, which commonly arises from unavoidable manufacturing defects at this interface. Three test configurations with varying electrode-dielectric gaps were devised and fabricated. The focus of the study was to analyze the characteristics and development process of partial discharge under repetitive frequency pulse voltage, as well as to explore the relationship between partial discharge and lifespan. A comparative analysis of the partial discharge characteristics among the three different configurations was conducted. Simulation calculations were performed to evaluate the instantaneous local temperature rise caused by partial discharge, revealing that the high temperature and high pressure generated during discharge play critical roles in film breakdown. Additionally, the study examined the trend of the first discharge voltage concerning the number of applied pulses in different configurations. The results indicated that in air-filled gaps, the first discharge voltage exhibited a trend of increase-decrease-increase, with the relationship between the maximum rise rate of the first discharge voltage in the early stage and the sample life following a power relationship characterized by a power exponent of -0.92. In the oil-gap configuration, the process of oil gap discharge generating bubbles and subsequent discharge within these bubbles resulted in a significant drop in the first discharge voltage. Furthermore, a negative power relationship was established between the decrease rate of the first discharge voltage and the remaining life in this configuration. © 2025 IEEE.

关键词： Electric discharges

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Dynamic Security Evaluation Method for power Systems Considering Cascading Failures 7

Dynamic Security Evaluation Method for Power Systems Conside...

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

作者： Liu, Ren Xu, Xingye Du, Wei Xiahou, Kaishun Zhu, Yihua Chang, Dongxu Guo, Hengdao Electric Power Research Institute of China Southern Power Grid Csg Key Laboratory For Power System Simulation Guangzhou China School of Electric Power Engineering South China University of Technology Guangzhou China Electric Power Research Institute of China Southern Power Grid State Key Laboratory of Hvdc Guangzhou China China Southern Power Grid National Energy Power Grid Technology R&d Centre Guangzhou China Intelligent Operation and Control For New Energy Power System Guangdong Provincial Key Laboratory of China Southern Power Grid Guangzhou China

ISBN: (纸本)9798350345094

With the increasing level of informatization and interconnection in the electric power system, the risk of external attacks on power systems is increasing. In response to the drawbacks of traditional static security assessment methods, this paper establishes two security metrics, which are voltage and power flow amplitude deviation security metric and power flow entropy security metric. Based on these security metrics, a dynamic security evaluation model that considers cascading failure is proposed. Simulation results demonstrate that the proposed security metrics can effectively reflect the security of cascading failure propagation, thereby providing valuable insights for decision-making by power system operators. © 2023 IEEE.

关键词： Informatization

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Optimal Scheduling Strategy of Source-Load-Storage Based onWind power Absorption Benefit

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Energy Engineering 2024年第7期121卷 1823-1846页

作者： Jie Ma Pengcheng Yue Haozheng Yu Yuqing Zhang Youwen Zhang Cuiping Li Junhui Li Wenwen Qin Yong Guo State Grid Henan Economic Research Institute Zhengzhou450000China Zaozhuang Power Supply Company State Grid Shandong Electric Power CompanyZaozhuang277000China Key Laboratory of Modern Power SystemSimulation and Control&Renewable Energy Technology Ministry of EducationNortheast Electric Power UniversityJilin132012China

In recent years,the proportion of installed wind power in the three north regions where wind power bases are concentrated is increasing,but the peak regulation capacity of the power grid in the three north regions of china is limited,resulting in insufficient local wind power consumption ***,this paper proposes a two-layer optimal scheduling strategy based on wind power consumption benefits to improve the power grid’s wind power consumption *** objective of the uppermodel is tominimize the peak-valley difference of the systemload,which ismainly to optimize the system load by using the demand response resources,and to reduce the peak-valley difference of the system load to improve the peak load regulation capacity of the *** lower scheduling model is aimed at maximizing the system operation benefit,and the scheduling model is selected based on the rolling *** load-side schedulingmodel needs to reallocate the absorbed wind power according to the response speed,absorption benefit,and curtailment penalty cost of the two DR dispatching ***,the measured data of a power grid are simulated by MATLAB,and the results show that:the proposed strategy can improve the power grid’s wind power consumption capacity and get a large wind power consumption benefit.

关键词： Wind power consumption two-layer optimal demand response rolling scheduling wind curtailment penalty

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Photovoltaic power Generation power Prediction under Major Extreme Weather Based on VMD-KELM

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Energy Engineering 2024年第12期121卷 3711-3733页

作者： Yuxuan Zhao Bo Wang Shu Wang Wenjun Xu Gang Ma National Key Laboratory of Renewable Energy Grid Integration China Electric Power Research InstituteBeijing100192China School of Electrical and Automation Engineering Nanjing Normal UniversityNanjing210023China

The output of photovoltaic power stations is significantly affected by environmental factors,leading to intermittent and fluctuating power *** the increasing frequency of extreme weather events due to global warming,photovoltaic power stations may experience drastic reductions in power generation or even complete shutdowns during such *** integration of these stations on a large scale into the power grid could potentially pose challenges to *** address this issue,in this study,we propose a network architecture based on VMDKELMfor predicting the power output of photovoltaic power plants during severe weather ***,a grey relational analysis is conducted to identify key environmental factors influencing photovoltaic power ***,GMM clustering is utilized to classify meteorological data points based on their probabilities within different Gaussian distributions,enabling comprehensive meteorological clustering and extraction of significant extreme weather *** data are decomposed using VMD to Fourier transform,followed by smoothing processing and signal reconstruction using KELM to forecast photovoltaic power output under major extreme weather *** proposed prediction scheme is validated by establishing three prediction models,and the predicted photovoltaic output under four major extreme weather conditions is analyzed to assess the impact of severe weather on photovoltaic power station *** experimental results show that the photovoltaic power output under conditions of dust storms,thunderstorms,solid hail precipitation,and snowstorms is reduced by 68.84%,42.70%,61.86%,and 49.92%,respectively,compared to that under clear day *** photovoltaic power prediction accuracies,in descending order,are dust storms,solid hail precipitation,thunderstorms,and snowstorms.

关键词： Major extreme weather photovoltaic power prediction weather clustering VMD-KELM network prediction model

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Photoacoustic Spectroscopy of CO Using 1567 nm Near-Infrared Distributed Feedback Laser Diode

Photoacoustic Spectroscopy of CO Using 1567 nm Near-Infrared...

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International Conference of Electrical, Electronic and Networked Energy Systems, EENES 2024

作者： Deng, Baojia Li, Long Yao, Qiang Jiang, Xinghai Chao, Xianzong Zeng, Fuping Electric Power Research Institute of State Grid Chongqing Electric Power Company Chongqing400000 China State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan430072 China

ISBN: (纸本)9789819618552

CO is an important product of partial discharge fault in SF6 and C5F10O gas-insulated equipment, and the high sensitivity detection of CO is helpful for the safe operation of SF6 gas-insulated equipment. Therefore, the pho-toacoustic spectroscopy of CO was studied by a near-infrared distributed feedback laser diode (DFB) with a central wavelength of 1567 nm combined with Erbium-doped fiber amplifier (EDFA) with a saturated output power of 2 W. The basic principle of photoacoustic spectroscopy detection is analyzed and the sound pres-sure distribution and resonance frequency of the photoacoustic cell with a length of 95 mm and a radius of 5 mm are simulated. Using wavelength modulation tech-nology, the second harmonic signal of multi-concentration CO was studied under the optimal modulation depth and modulation frequency. The results of the second harmonic detection show that the lower detection limit and linear correlation of the system is 65.7 ppm and 0.996, respectively. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Infrared devices

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Longitudinal Comparison Protection Method for AC/DC Hybrid Distribution Network Based on Waveform Similarity

Longitudinal Comparison Protection Method for AC/DC Hybrid D...

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2023 International Conference on power System Technology, powerCon 2023

作者： Lu, Zhengfei Cong, Wei Zhang, Anlong Huang, Yingqi Zhou, Yu Wang, Zeqian China Southern Power Grid Shenzhen Power Supply Company Shenzhen China Key Laboratory of Power System Jinan China

ISBN: (纸本)9798350300222

With the maturity of DC transmission and distribution technology, the future distribution network will gradually develop in the direction of AC/DC hybrid distribution network (AC/DC-HDN). The unique fault coupling characteristics of AC/DC-HDN challenge the adaptability of protection methods. Based on the analysis of the fault coupling characteristics of AC/DC-HDN, this paper proposes a longitudinal comparison protection method for AC/DC-HDN based on waveform similarity. The method chiefly employs electrical quantity of the measurement point to calculate reference voltage of the corresponding reference point. Determine whether the fault location is located between measurement point and reference point or outside by determining whether the wave-form of the measured voltage is similar to that of the reference voltage or not. The longitudinal protection makes a decision on whether the fault occurs internal or external by comparing the results. Finally, the correctness of this protection method was verified by setting different location faults in PSCAD. The method can accurately determine whether the fault occurs internal or external, has a certain resistance to transition resistance, is not affected by unmeasurable load branches, and has good coping ability for calculation errors caused by noise interference. © 2023 IEEE.

关键词： Electric power distribution

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Design of a Multi- Time-Scale Simulation Platform for Intelligent Distribution Networks Coordinating Source-grid-Load-Storage

Design of a Multi- Time-Scale Simulation Platform for Intell...

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

作者： Hu, Binjiang Lu, Yuanhong Zhang, Jingyue Guo, Tianyu Huang, Libin Zhao, Yanjun Guo, Zhilong Xu, Dehuai Electric Power Research Institute China Southern Power Grid State Key Laboratory of HVDC Guangzhou China China Southern Power Grid Co. Ltd Guangzhou China Dawning Network Technology Co. Ltd Wuhan China

ISBN: (纸本)9798331504557

The article proposed a multi-timescale simulation platform tailored for the coordinated operation of source, grid, load, and storage in intelligent distribution networks, and proposes an optimized dispatching strategy. This strategy encompasses models for Electric Vehicles (EVs) participating in dispatching, as well as a classification of flexible loads, adapting to various timescales. By means of cost-minimizing dispatch on the day-ahead timescale, rolling optimization corrections on the intra-day scale, and fine-tuning of output deviations in real-time, the strategy enhances both the economic efficiency of the distribution network and the integration rate of Distributed Generation (DG). The multi-timescale scheduling model effectively reduces electricity purchase costs by over 20%. © 2024 IEEE.

关键词： distribution network electric vehicle multi-time scale source-grid-load-storage

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Experimental Study on Dielectric Behavior of Silicone Gel under Long-term High Temperature Service 5

Experimental Study on Dielectric Behavior of Silicone Gel un...

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5th IEEE International Conference on Dielectrics, ICD 2024

作者： Guo, Xinnuo Su, Dazhi Zeng, Fuping Chen, Rirong Zhong, Hengxin Yao, Qiang Deng, Baojia Tang, Ju School of Electrical Engineering and Automation Wuhan University State Key Laboratory of Power Grid Environmental Protection Wuhan China State Grid Chongqing Electric Power Research Institute Chongqing China

ISBN: (纸本)9798350308976

As a polymer with stable chemical properties and electrical strength, silicone gel is widely used in the packaging of IGBT. With the development of IGBT towards higher power, the reliability of packaging materials has attracted wide attention. In this research, a blast drying oven was used to simulate high-temperature service conditions in accelerated thermal aging tests. Broadband dielectric spectroscopy and power frequency breakdown voltage experimental test platforms were used to characterize the dielectric behavior of silicone gels at different aging stages. Finally, the mechanism was discussed by FTIR test. The experimental results show that ϵ' does not vary much in the frequency range, while ϵ' produces a relaxation phenomenon. In considering the influence of service time, the polarization is more pronounced due to the exposure of the shedding of the side chains and the Si-O-Si main chain to the electric field, which leads to an upward trend in both the ϵ' and ϵ''. Similarly, due to the increase of free volume and the increase of microdefect, the power frequency breakdown electric field strength of the sample decreases. This research provides a basis for the performance improvement of silicone gel. © 2024 IEEE.

关键词： Dielectric Properties Long-term High Temperature Service power Device Packaging Silicone Gel Thermal Aging

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