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Electrical Engineering and Control Science (IC2ECS), International Conference on

作者： Qingming Lin Wen Sun Wenhui Zhang Xiaocun Wang Junquan Piao Yun Zhou Electric Power Research Institute State Grid Shanghai Electric Power Company Shanghai China Puneng Power Technology Engineering Branch Shanghai Hengnengtai Enterprise Management CO. Ltd Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China

With the lack of fossil energy and the gradual accentuation of ecological and environmental problems, new energy generation will gradually occupy a dominant position in China’s energy structure, and electric vehicles, mainly new energy, will be vigorously promoted. With the popularity of charging piles, the function and detection accuracy, and portability of charging pile testing devices have become a hot research topic. This paper firstly introduces the testing purpose and development history of charging pile testing devices, secondly summarizes the main functions and working principles of existing charging pile testing devices, and finally systematically analyzes the charging pile communication protocol conformance testing and field interoperability technology testing methods.

关键词： Electrical engineering Technological innovation Protocols Manuals Inspection Environmental factors Electric vehicle charging

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Improved Scheme for Single-Ground Fault Suppression Based on Grounded-Fault Transfer Device 7

Improved Scheme for Single-Ground Fault Suppression Based on...

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7th IEEE International Conference on High Voltage Engineering and Application, ICHVE 2020

作者： Liu, Hongwen Wang, Ke Ran, Jiaquan Yang, Qing He, Lewei Electric Power Research Institute Yunnan Power Grid Co. Ltd. Kunming China School of Electrical Engineering State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing China

ISBN: (纸本)9781728155111

For the sake of reliability of power distribution, medium voltage distribution networks apply small-current earthed mostly. However, traditional resonant earthed methods applied arc suppression coil have poor performance as capacitive current growing rapidly. In order to eliminate single-ground fault effectively, a full-compensation method based on controllable voltage source is therefore proposed and grounded-fault transfer device is applied. Controllable voltage source proposed based on high power electronic devices could inject compensation voltage with specific phase and amplitude into neutral point, which could realize single-ground fault self-extinguish. And grounded-fault transfer device applied in the improved scheme could improve the efficiency of full-compensation method. The verification of the improved scheme for single-ground fault full-compensation is supported by PSCAD/EMTP. Results acquired indicate that the improved scheme for single-ground fault suppression method based on grounded-fault transfer device could eliminate single-ground fault efficiently. © 2020 IEEE.

关键词： Electric grounding

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An Non-Intrusive Load Event Detection Approach Based on CEEMDAN-WTD-F Test

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Journal of Computers (Taiwan) 2022年第6期33卷 21-36页

作者： Yi, Ling-Zhi Liu, Xi-Meng Zhang, Guo-Yong Song, Hui-Na Liu, Ning College of Information Engineering Xiangtan University Hunan Engineering Research Center of Multi-energy Cooperative Control Technology Hunan Xiangtan China Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment & State-Grid Hunan Electric Power Company Disaster Prevention and Reduction Center Hunan Changsha China Wasion Group Limited Hunan Changsha China

To improve the perception of the switch state of the electrical equipment and realize the identification of the non-intrusive load switching process more accurately, a non-intrusive load event detection method based on the CEEMDAN-WTD-F test is proposed in this paper. Firstly, the adaptive median filter is used to reduce the noise fluctuation of power data of electric equipment and the discrete sequence derivative is used to reduce turn-on transition time for individual loads. Then, based on the principle of decomposition denoising and statistical testing, Complete Ensemble Empirical Mode Decomposition with Adaptive Noise (CEEMDAN) and Wavelet Threshold De-noising (WTD) are used to process the input signal, and then the F test is used to determine whether an event occurs. Then, the proposed detection method is verified on the BLUED public data set, and a comparison experiment is carried out with the existing detection algorithm. The experimental results fully show that the proposed method has a lower missed detection rate and false detection rate than other detection algorithms, and the detection precision rate, recall rate, and F1 value are higher than 97%. © 2022 Computer Society of the Republic of China. All rights reserved.

关键词： Empirical mode decomposition

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Research on Screening Method of Operating Risk Points for power System Pre-Dispatch

Research on Screening Method of Operating Risk Points for Po...

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power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Yi Wang Ji Zhang Qingcheng Liu Ling Xu Xin Wu NARI Group Corporation (State Grid Electric Power Research Institude) Nanjing China NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China East China Branch of State Grid Corporation of China Shanghai China

As a concept proposed by the new generation dispatching and control system, pre-dispatch is a control method for accurately adapting to situation changes and operational risks of power grid operation in the future. Regarding the problem of power system security assessment under pre-dispatch, this paper proposes a multi-snapshot grid operating risk points screening method. Three models based on optimal power flow are employed for power flow analysis after the power grid operating status changes, then the power grid operation trend data is obtained. And after initial risk screening, possible operating risk points are obtained to form a risk data set. The proposed model is tested in the IEEE39-node system. The risk data sets screened by the three models are identical, which confirms the validity of the proposed model. The proposed method for screening operating risk points can provide dispatchers with a wide range of online auxiliary decision support.

关键词： Electrical engineering power system protection Market research power grids Data models Dispatching Safety

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Robot Path Planning Based on Improved Reinforcement Learning

Robot Path Planning Based on Improved Reinforcement Learning

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作者： Jian FANG Kuang YIN Hongbin WANG Wenxiong MO Fan YANG Power Test Research Institute of Guangzhou Power Supply Bureau of Guangdong Power Grid Co. Ltd State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University

With the continuous progress and development of robotics,mobile robots have been widely used in many different *** the power grid,mobile robots are used to inspect electrical equipment,which greatly reduce the investment of manpower and material ***,in many cases,mobile robots need to work in a constantly changing and complex *** they cannot obtain environmental information in time,it is often difficult to make path *** response to this problem,this paper proposes a path planning method for mobile robots based on improved reinforcement *** method establishes a grid environment model,defines the return value through the number of steps of the robot,and then proposes a changing action selection strategy for the balance between the robot's exploration and utilization of the environment in reinforcement learning,so that the exploration factor dynamically change with the increase of the robot's exploration degree of the environment,thus speeding up the convergence speed of the learning *** results show that this method can realize autonomous navigation and path planning of mobile robots in complex *** with traditional algorithms,it greatly reduces the number of iterations.

关键词： Path planning grid environment reinforcement learning exploration factor

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Study on the fault ride through control for AC-DC hybrid distribution network 16

Study on the fault ride through control for AC-DC hybrid dis...

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16th IET International Conference on AC and DC power transmission, ACDC 2020

作者： Zhou, Yongrong Lu, Yongcan Ge, Xuefeng Li, Dandong State Grid Electric Power Research Institute Co. Ltd. Jiangsu Province Nanjing China State Key Laboratory of Smart Grid Protection and Operational Control Jiangsu Province Nanjing China School of Power Electric Engineering Nanjing Institute of Technology Jiangsu Province Nanjing China Electric Power Research Institute State Grid Jiangsu Electric Power Co. Ltd Jiangsu Province Nanjing China

ISBN: (纸本)9781839533914

Fault ride through control is an important technology for an efficient operation of AC/DC hybrid distribution network with multiple distributed energies. In this paper, a fault ride through control with energy storage is proposed, in which extra super capacitors is installed on the dc side of the power electronic transformer. The coordinated control of the super capacitors is designed. Meanwhile, the volume calculation of super capacitor is discussed. Finally, a model is established in MATLAB/Simulink and simulations are carried out. The results verify that the low voltage ride through ability of AC/DC hybrid distribution network is enhanced, and the output voltage of the DC side is more stable, with the auxiliary super capacitor. © 2020 Institution of Engineering and technology. All rights reserved.

关键词： Energy storage

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Design and Ccomparison of Three Schemes of High Voltage Nanosecond Trigger

Design and Ccomparison of Three Schemes of High Voltage Nano...

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advanced Electrical Equipment and Reliable Operation (AEERO), International Conference on

作者： Yifan Wang Hanliang Lin Hongmei Gao Chaoyang Kang Hongshun Liu Qizhao Zhang Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment Shandong University Jinan China State Grid Binzhou Electric Power Supply Company Binzhou China

ISBN: (纸本)9781665402651

In order to provide a Marx generator with pulses with a leading edge less than 30ns and a half-width greater than 200ns, the circuits of Marx generator type flip-flop, pulse transformer type flip-flop and capacitor fast discharge type flipflop are studied, and the effects of circuit parameters on output pulses are analyzed. On this basis, three kinds of triggers are designed and simulation models are established, and the optimal scheme is selected by comparing the simulation results.

关键词： Simulation Capacitors High-voltage techniques Voltage Generators Discharges (electric) Pulse transformers

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Parallel Virtual Impedance Based Fluctuation power Delivery Strategy For MMC Based SST

Parallel Virtual Impedance Based Fluctuation Power Delivery ...

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IEEE International Symposium on power Electronics for Distributed Generation Systems (PEDG)

作者： Jaiyi Li Jianqiao Zhou Jianwen Zhang Gang Shi Xu Cai Yong Wang Xiaofeng Dong Wei Bao College of Information Science and Technology Donghua University Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China HVDC Transmission and Power Electronics Business Unit Beijing Sifang Automation CO. Ltd. Beijing China Facilities Management Suzhou Power Supply Company Suzhou China Shanghai Electrical Apparatus Research Institute Group CO. Ltd. State Grid Shanghai Municipal Electric Power Company Shanghai China

Modular multilevel converter (MMC) based solid state transformer (MMC-SST) shows promise in hybrid AC/DC distribution grid. This paper introduces a topology consisting of cells made of directly coupled MMC sub-modules (SMs) and isolated SAB modules forming a multi-port SST for grid interconnection. Due to the large SM capacitors for low frequency fluctuation power handling, the device power density is low, which will limit its application. This paper proposes an MMC-SST SM capacitor optimization method based on fluctuation power delivery. It reduces the equivalent low frequency impedance of the SAB by parallel virtual impedance. Low frequency fluctuation power will be delivered into SAB circuit and naturally eliminated in low-voltage DC side due to three-phase symmetrical MMC-SST structure. Therefore, the SM capacitance could be optimized where the power fluctuation flowing into it are reduced. The feasibility of the proposed method is verified by a simulation model.

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Characteristics investigation on 4.5kV IGBT with partially narrow mesa and split-gate

Characteristics investigation on 4.5kV IGBT with partially n...

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作者： Xuebing Zhai Tong Yang Ruliang Zhang Jiang Du State Key Lab of Advanced Power Transmission Technology Global Energy Interconnection Research Institute CoLtd Electronic Engineering Department Xi'an University of Technology Electric Power Dispatching Control Center State Grid Jilinsheng Electric Power Supply Company

Low on-state voltage and low turn-off loss are key issues for IGBT used in HVDC and FACTS. Partial narrow mesa was introduced to improve emitter side contact resistance of IGBT based on Nakagawa limit assumption. However, turn-off loss increases and short circuit sustainability get worse. Split gate separates gate electrode from drift region and reduces gate-collector capacitance to lower turn-off energy loss. Combination partial narrow mesa with split gate can get better gate performance and turn-off characteristics in 4.5kV IGBT. Simulated results with TCAD show proposed models improves switching loss and gate reliability. By adjusting split gap electric filed, split gate shape has an important effect on turn-on characteristics.

关键词： Characteristics investigation on 4.5kV IGBT with partially narrow mesa and split-gate

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Study on Performance Modification of Insulation Wraps for power transmission Line Corona Noise Prevention

Study on Performance Modification of Insulation Wraps for Po...

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International Conference on Intelligent Computing, Automation and Systems (ICICAS)

作者： Liu Yiyi Chen Wei Lu Dan Wu Junjie Qi Wei State Grid Laboratory of Electric Equipment Noise and Vibration Research State Grid Hunan Electric Power Corporation Research Institute Changsha China State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665428118

Study and prevention of transmission line corona noise has become an important means to effectively promote the environmental friendliness and energy saving of transmission line. Studies have shown that using hydrophilic coating treatment on the conductor surface, so that under the condition of precipitation, the rainwater can be evenly distributed on the conductor surface to reduce the formation density of water droplets, which can weaken the impact of raindrops on the curvature radius of the conductor. As a result, less distorted electric field and soft noise were produced, leading to reduce corona noise ultimately. The greater hydrophilicity of the conductor surface, the more significant the reduction of corona noise is. In this paper, experiments have validated that the modification of nano aluminum oxide by electron beam radiation graft technology can improve its surface reactivity, promote its dispersion and bonding ability in RTV rubber matrix, and then elevate the hydrophobicity, mechanical properties and aging resistance of modified RTV silicone rubber. In addition, specific properties of thermal conductivity and hydrophobicity can be improved by further adding functional monomers.

关键词： power transmission lines transmission line matrix methods Electron beams Surface resistance Conductors Thermal conductivity Corona

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