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10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Cui, Liu Li, Shuyong Huang, Libin Guo, Qi Deng, Lijun State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China National Energy Power Grid Technology R and D Centre Guangzhou510663 China 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

ISBN: (纸本)9789819934034

In order to test the travelling wave fault location devices that widely used in power system, a simulation model that can reflect the transformer characteristics of travelling waves on the transmission channel should be built. In this paper, the current transformer (CT) on the transmission channel is modelled, then the CT attenuation characteristic to travelling waves is proved by adding sine wave and square wave on the CT primary side. By using PSCAD and travelling wave fault locator examiner, a half-real time simulation environment is constituted to test the travelling wave fault locator. In PSCAD, CT is modeled by measuring parameters. Finally, amplitude frequency response characteristics of the actual CT and the CT model are compared. The result shows that simulation model in this paper reflects well on the CT high-frequency attenuation characteristic. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Electric instrument transformers

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Self-Healing Optimization of power grid under High Penetration of New Energy 25

Self-Healing Optimization of Power Grid under High Penetrati...

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25th IEEE China Conference on System Simulation Technology and its Application, CCSSTA 2024

作者： Jin, Zelong Yang, Bohan Kong, Xiangyu Zheng, Meiling Liu, Jiancun Tianjin University of Technology Tianjin Key Laboratory of New Energy Power Conversion Transmission and Intelligent Control Tianjin China Tianjin University Key Laboratory of Smart Grid Tianjin China Tianjin University School of Electrical and Information Engineering Tianjin China

ISBN: (纸本)9798350366600

In order to address the problem of high penetration of new energy into the grid, which brings huge intermittency and volatility to the distribution network, and to overcome the shortcomings of the traditional methods such as genetic algorithm and whale algorithm, which are limited and unable In order to construct the most suitable scenarios, this paper considers a distribution network system containing a significant quantity of distributed photovoltaic energy under a high penetration rate. It then builds a stochastic planning model for self-healing of the distribution network by constructing constraint functions and objective functions. The construction of the constraint function and objective function enables the development of a self-healing stochastic planning model for the distribution network. This model is solved using the scenario tree stochastic method and the improved PSO algorithm. Finally, the feasibility of the self-healing optimization method proposed in this paper is verified by applying it to four typical scenarios to demonstrate the limitations of the traditional method. In brief, the methodologies presented in this paper offer superior alternatives to traditional methods. The optimization solution is more expedient and precise, with a discernible positive impact on the self-repair capability of the distribution network and secure operation. © 2024 IEEE.

关键词： power distribution networks

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Cu-doped SnO_(2)/rGO nanocomposites for ultrasensitive H2S detection at low temperature

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Microsystems & Nanoengineering 2023年第3期9卷 61-71页

作者： Tingting Chen Jianhai Sun Ning Xue Wen Wang Zongchang Luo Qinqin Liang Tianye Zhou Hao Quan Haoyuan Cai Kangsong Tang Kaisheng Jiang State Key Laboratory of Transducer Technology Aerospace Information Research InstituteChinese Academy of Sciences100194 BeijingChina School of Electronic Electrical and Communication EngineeringUniversity of Chinese Academy of Sciences100049 BeijingChina State Key Laboratory of Acoustics Institute of AcousticsChinese Academy of Sciences100190 BeijingChina Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment School of Electronic EngineeringGuangxi UniversityNanning 530004 GuangxiChina Electric Power Research Institute of Guangxi Power Grid Co. Ltd.Nanning 530013 GuangxiChina

Hydrogen sulfide(H_(2)S)detection remains a significant concern and the sensitivity,selectivity,and detection limit must be balanced at low ***,we utilized a facile solvothermal method to prepare Cu-doped SnO_(2)/rGO nanocomposites that have emerged as promising candidate materials for H_(2)S *** of the Cu-SnO_(2)/rGO was carried out to determine its surface morphology,chemical composition,and crystal *** optimal sensor response for 10 ppm H_(2)S was~1415.7 at 120℃,which was over 320 times higher than that seen for pristine SnO_(2)CQDs(R_(a)/R_(g)=4.4)at 280℃.Moreover,the sensor material exhibited excellent selectivity,a superior linear working range(R^(2)=0.991,1-150 ppm),a fast response time(31 s to 2 ppm),and ppb-level H_(2)S detection(R_(a)/R_(g)=1.26 to 50 ppb)at 120℃.In addition,the sensor maintained a high performance even at extremely high humidity(90%)and showed outstanding long-term *** superb H_(2)S sensing properties were attributed to catalytic sensitization by the Cu dopant and a synergistic effect of the Cu-SnO_(2)and rGO,which offered abundant active sites for O_(2)and H_(2)S absorption and accelerated the transfer of electrons/holes.

关键词： stability. selectivity attributed

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Reactive power Optimization of Distribution Network with Renewable Energy Based on IAGPSO 5

Reactive Power Optimization of Distribution Network with Ren...

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5th IEEE International Conference on power, intelligent Computing and Systems, ICPICS 2023

作者： Hu, Pingzhao Chang, Naichao Ma, Xiang Sun, Wenduo Liu, Jiantao Zhang, Kaifeng Yuan, Kun Ministry of Education Southeast University Key Laboratory of Measurement and Control of Cse Nanjing China National Electric Power Dispatching and Control Center of State Grid Corporation of China Beijing China State Grid Zhejiang Electric Power Co. Ltd. Jinhua Power Supply Company Jinhua China State Grid Zhejiang Electric Power Company Hangzhou China Nanjing China

ISBN: (纸本)9798350333442

With the rapid development of renewable energy represented by photovoltaic and wind power, the influence of the integration of renewable energy generation is increasing, and the voltage over-limit problem brought by grid-connected renewable energy needs to be solved urgently. In this paper, the reactive power compensation provided by photovoltaic and wind power inverters is considered in the distribution network scenes, combined with commonly used reactive power compensation resources for reactive power optimization of power system. First, a multi-objective function with network loss, voltage deviation and reactive power compensation priority is designed, and the weight of the multi-objective function is assigned by Analytic Hierarchy Process. Then, combined with the crossover characteristics of Genetic Algorithm, the improved adaptive Particle Swarm Optimization (IAGPSO) is used to optimize. Finally, the algorithm was simulated on the IEEE33-bus system. The result of IAGPSO is compared with that of Particle Swarm Optimization (PSO), which verifies the improvement effect of our algorithm. © 2023 IEEE.

关键词： Electric power distribution

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Fault Location and Phase Selection Method of Distribution Network Containing IIDG Based on Online Active Detection 2

Fault Location and Phase Selection Method of Distribution Ne...

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2023 2nd International Conference on power System and Energy Technology, ICPSET 2023

作者： Cheng, Yunxiang Liu, Xiangbo Wang, Sen Gao, Fang Li, Hao Yu, Chengao Tao, Zhengchen Power Supply Service Command Center State Grid Rizhao Power Supply Company Rizhao China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China

This paper proposes a fault location and phase selection method for the distribution network containing IIDG based on online active detection, utilizing online active detection. In this method, the characteristic harmonic current injection control strategy based on d- and q-axis control is obtained by analyzing the structure, control strategy, and short-circuit current of IIDG. During a fault, the distributed power supply injects characteristic harmonic current into line, adapting its magnitude with the short-circuit current's size. By detecting the difference in harmonic current content rate for both ends of the fault point, the method achieves online location and line selection of fault points. A 10 kV IIDG distribution network model is simulated by using PSCAD to validate the feasibility and accuracy of the proposed fault location and phase selection method. © Published under licence by IOP Publishing Ltd.

关键词： Electric power distribution

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Simulation Testing of Large-Scale grid-Connected Wind power with Energy Storage System Based on Active Support Performance Evaluation Indices 10

Simulation Testing of Large-Scale Grid-Connected Wind Power ...

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10th International Forum on Electrical Engineering and Automation, IFEEA 2023

作者： Zhu, Yihua Hu, Yun Tu, Liang Su, Mingzhang Luo, Chao Csg State Key Laboratory of Hvdc Electric Power Research Institute 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 China Southern Power Grid Csg Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China

ISBN: (纸本)9798350309379

This paper establishes simulation modeling for large-scale grid connected wind power with energy storage system (ESS). The conventional grid-following (GFL) based ESS is used as a reference object to test the active support performance of large-scale grid-connected wind power with grid-forming (GFM) based ESS with active support performance evaluation indices in different scenarios. (1) Small disturbance evaluation indices: The point of common coupling (PCC) frequency/voltage drop depth and recovery time. (2) Large disturbance evaluation indices: The PCC frequency/voltage drop depth and rise height after fault removal. The output active/reactive power drop depth and rise height/recovery time after fault removal. (3) Island capability evaluation indices: The PCC frequency/voltage fluctuation amplitude at the moment of switching and system stability after switching. © 2023 IEEE.

关键词： active support performance evaluation indices different scenarios grid-following (GFL) grid-forming (GFM)

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Feature Extraction Method for Transient Overvoltage Based on Spearman Correlation Coefficient 7

Feature Extraction Method for Transient Overvoltage Based on...

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

作者： Gao, Xin Zhang, Zhe Wang, Han Wu, Cheng Zhou, Ning Li, Xin Qin, Boyu School of Electrical Engineering Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an China Shandong Electric Power Dispatching and Control Center State Grid Shandong Electric Power Company Jinan China Power Grid Technology Center State Grid Shandong Electric Power Research Institute Jinan China State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9798350345094

The large-scale grid connection of renewable energy is accompanied by problems such as insufficient voltage support capability and weakened disturbance resilience. For multiterminal DC sending system, commutation failure faults may lead to overvoltage issues, threatening the safety and reliability of power grids. To better assess transient overvoltage levels, this paper proposes a feature extraction method based on Spearman correlation coefficient, exploring key response variables related to transient overvoltage level. Firstly, based on the dynamic characteristics of renewable energy and induction motors during fault periods, the overvoltage mechanism under commutation failure is studied. Then, according to transient characteristics after commutation failure, main influencing factors of transient overvoltage are analyzed. Combining the influencing factors, a feature extraction method based on Spearman correlation coefficient is proposed, which improves the speed and accuracy of input feature selection. Finally, case study is implemented to validate the effectiveness of the proposed method. © 2023 IEEE.

关键词： Induction motors

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Fiber Optic MEMS Ultrasonic Sensor and its Application in Partial Discharge Detection 2

Fiber Optic MEMS Ultrasonic Sensor and its Application in Pa...

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2nd International Conference on Frontiers of Electrical power and Energy Systems, EPES 2022

作者： Liu, Kang Shi, Ji Xie, Lang Zhou, Qian Zhang, Juanjuan Liu, Yurui Power Dispatching Control Center of Guizhou Power Grid Co. Ltd Guiyang China Key Laboratory of Optical Fiber Sensing and Communication Education Ministry University of Electronic Science and Technology of China Chengdu Sichuan611731 China

In this paper, an optical fiber based ultrasonic sensor was designed and applied to the detection and position of partial discharge (PD). The Fabry-Perot interferometer with a micro-electromechanical system (MEMS) diaphragm has been proven to have high sensitivity, with broadband acoustic frequency response up to 500 kHz and wide directivity. In the PD detection experiment, the minimum detectable pressure (MDP) of the fiber optical MEMS sensor is achieving 0.455μPaHz -1/2. In addition, four ultrasonic sensors are arranged around the ultrasonic source to conduct localization experiments. The results show that the system has excellent localization performance in x, y and z directions. The favourable acoustic performance of the MEMS sensor provides a high-sensitivity and high signal-to-noise ratio (SNR) detection method for PD detection. © Published under licence by IOP Publishing Ltd.

关键词： Signal to noise ratio

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Optical Detection of Corona Discharge Based on SiPM at DC Voltage 1

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Kang, Ning Chen, Lin Baheyi, Tayierjiang Liu, Qi Chen, Zhiheng Xu, Zihan Zheng, Lijun Lei, Zhipeng Urumqi Power Company of State Grid Xinjiang Electric Power Co. Ltd Urumqi830000 China Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan030024 China

ISBN: (数字)9789819714285

ISBN: (纸本)9789819714278

Partial discharge (PD) is a significant technique to detect and estimate the insulation fault in the gas insulated switchgear (GIS). However, the PD signal acquired on-site is always coupled with noise or interference. In this paper, a PD optical measuring technique based on the silicon photomultiplier (SiPM) was applied to measure corona discharge under DC voltage. The SiPM structure and optical signal processing circuit were first introduced. The corona discharge at the different PD inception voltages was measured. The PD optical signal and the electrical signal were compared in time and frequency domain respectively. Experiments show that the SiPM sensor can effectively detect the PD pulses as the PD measurement based on the electrical signal. PD optical signal is an impulse signal with a higher amplitude and shorter duration which is beneficial to filter the noise. © Beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Electric switchgear

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grid-Forming Photovoltaic-Energy Storage System with Higher Flexibility Based on DC-Link Voltage Synchronization control

Grid-Forming Photovoltaic-Energy Storage System with Higher ...

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2024 CPSS and IEEE International Symposium on Energy Storage and Conversion, CPSS and ISESC 2024

作者： Wu, Mingkang Feng, Xingyu Zhu, Yihua Wang, Chenchen Luo, Chao Li, Kai Electric Power Research Institute China Southern Power Grid Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangdong Province Guangzhou City China School of Electrical Engineering Beijing Jiaotong University Beijing China

ISBN: (纸本)9798350380514

As the grid strength gradually weakens, there is an urgent need to enhance the weak grid adaptability and precise control capability of photovoltaic-energy storage (PV-ES) systems. This paper analyzes the basic principles of the PV-ES virtual synchronous generator (PV-ES VSG) control scheme under the common DC bus. A flexible control scheme for grid-connected PV-ES systems is proposed based on DC-link voltage synchronization control (DVSC). Compared to existing PV-ES VSG control schemes, the proposed scheme can significantly improve the control flexibility of the energy storage and increase the diversity of its control algorithms, while maintaining similar power support capabilities and grid-connected performance. This improvement not only optimizes the performance of the energy storage unit in the power grid, but also reduces its burden and pressure on DC bus voltage control. Simulation results based on MATLAB/Simulink and the experiment results based on the Hardware-In-Loop (HIL) platform validate the effectiveness and rationality of the proposed scheme. The comparison with the PV-ES VSG also shows the advantages of the proposed scheme. © 2024 IEEE.

关键词： Synchronous generators

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