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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Tian, Liting Cheng, Lin Wan, Yuxiang Yuan, Kai Liu, Rui Wu, Kuihua Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Beijing China State Grid Economic Technology Research Institute Beijing China Institute State Grid Shandong Electric Power Company Economic Technology Research Jinan China

ISBN: (纸本)9781728196060

Distributed Energy Resources(DERs) will be an important part of the future power system under the spread of distributed renewable energy generation, electric vehicles, demand response and other technologies. Cyber-physical system (CPS) is one of the development directions for the future smart grid to integrate the widespread DERs. First, this paper presents the basic architecture and operation process of virtual power plant (VPP). Then the solution of communication structure and software platform are proposed. It is pointed out that virtual power plants have good applicability in information and communication infrastructure, power market and DER integration. Finally, a demonstration program in China is introduced. The research and application of virtual power plant is currently in its embryonic form. It provides a solution for the transmission from centralized power production to the distributed energy utilization, and is an adequate way to integrate geographical dispersion, heterogeneous DERs. © 2020 IEEE.

关键词： Virtual power Plants

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Noise Reduction of Partial Discharge in power Cable Insulation Based on Deep Learning 7

Noise Reduction of Partial Discharge in Power Cable Insulati...

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

作者： Bin, Ding Jingwen, Liu Jianning, Chen Yuanxiang, Zhou Xuewei, Wang Jiamin, Ge Xiong'an Power Supply Company State Grid Baoding China Tsinghua University China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing China Xinjiang University Department of Electrical Engineering Urumqi China

ISBN: (纸本)9781728155111

With the rapid development of ultra-high voltage (UHV) transmission technology in China, insulation diagnosis for power equipment has been applied widely to improve the reliability of the giant power system. Partial discharge (PD) detection, with the advantages of high precision and convenient deployment, plays an important role in defect detection, location, and classification. However, the low signal to noise ratio (SNR) of PD signals and poor electromagnetic environment make it difficult to extract useful features from PD signals. To distinguish the PD signals from noise, a noise reduction method based on deep learning is proposed in this paper. With short-time Fourier transform (STFT) technology, time-domain PD signals with various noise were first transformed into time-frequency domain patterns. After preprocessing the raw pattern, a deep convolutional neural network (CNN) was built, trained, and tuned for noise reduction of PD signals. Finally, the noise reduction model was verified and compared with the traditional method based on wavelet analysis. The results demonstrate that noise reduction mothed based on deep learning can restore the PD signals with more than 90% noise reduced. Given the advantage that the convolution kernel could sense both the time-related information and the frequency-related information in a spectrum simultaneously, the DnCNN model performs better than wavelet analysis. The noise reduction model proposed in this paper is based on new generation artificial intelligence, providing a new approach for PD signal restoration, which promotes the reliability of the power system. © 2020 IEEE.

关键词： Partial discharges

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Research on Energy Storage Capacity Configuration Method and Performance Evaluation in New Energy Base

Research on Energy Storage Capacity Configuration Method and...

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2022 Asia power and Electrical Technology Conference, APET 2022

作者： Zhang, Ruoyu Wang, Liangyou Sun, Changping Le, Bo Wang, Mian Cui, Kangsheng Institute of Science and Technology China Three Gorges Corporation Beijing China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Beijing China

ISBN: (纸本)9781665453349

In order to improve the power output stability and frequency stability when large-scale new energy is integrated into the grid, large-scale new energy base must consider the configuration of energy storage systems with a certain capacity. Facing the demand under the background of new energy development, this paper analyzes the positive impact of energy storage to new energy base. The configuration method of energy storage capacity is proposed, and furthermore, the proposed method is used to calculate the capacity of the energy storage system required to be configured in a typical new energy base, and the power suppression and stability improvement effects brought by the energy storage are evaluated. The case analysis results show that the required energy storage capacity of a new energy base is about 10% of its total wind power and photovoltaic capacity. This configuration ratio can basically achieve the stability of the new energy output fluctuation, and at the same time provides the same frequency regulation capability with conventional generator set of equal capacity. © 2022 IEEE.

关键词： Energy storage

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Capacity Optimization of Hydrogen Buffer Tanks in Renewable power to Ammonia (P2A) System

Capacity Optimization of Hydrogen Buffer Tanks in Renewable ...

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IEEE General Meeting power& Energy Society

作者： Jiarong Li Jin Lin Yonghua Song State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University University of Macau Beijing China

ISBN: (数字)9781728155081

ISBN: (纸本)9781728155098

power to hydrogen is a promising method to consume surplus renewable energy existing in the world. However, due to bottlenecks in hydrogen storage and transportation, converting hydrogen into ammonia which is a kind of hydrogen carrier with satisfied quality in storage and transportation is considered. Industrial ammonia synthesis reactors always work in constant conditions with constant flow rate of the feed gas, while hydrogen output of electrolyzers may vary sharply across renewable energy, thus hydrogen buffer tanks are required between electrolyzers and reactors to eliminate the fluctuation to some extent. The capacity of the buffer needs to be optimized due to relatively expensive cost of tanks, and the optimal capacity of the buffer actually depends on the operation flexibility of the reactor which is rarely discussed in existing literatures. This paper studies operation flexibility of the reactor first and establishes operation model of ammonia synthesis system under variable working conditions, on this basis the capacity optimization model is proposed and verified by a P2A system. At last the operation performance and the economy of P2A system are discussed, and case studies show that about 24% of total investment cost can be reduced with the consideration of operation flexibility of the reactor.

关键词： Ammonia Renewable energy sources Hydrogen Transportation Inductors Optimization Investment

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Cause Identification of Single-line-to-ground Fault in Distribution System

Cause Identification of Single-line-to-ground Fault in Distr...

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2021 International Conference on power System Technology, powerCON 2021

作者： Liu, Kun Ren, Xuan Wang, Bin Power Dispatch Control Center of Guangdong Power Grid Co. Ltd Key Lab for Protective Relaying Real Time Digital Simulation of Guangdong Power Grid Co. Ltd. Guangzhou China Tsinghua University Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electric Engineering Beijing China

ISBN: (纸本)9781665407373

Cause identification of single-line-to-ground fault in the distribution system is of great significance to the electric workers for fault isolation and rapid maintenance. The key of fault cause identification is to accurately and quickly distinguish human electric shock faults from non-biological faults. In this paper, human electric shock faults and non-biological faults are modeled and fault characteristics are analyzed. Based on the differences between shape and rotation characteristic of the volt-ampere characteristic curves, a fault cause identification method which can distinguish human electric shock faults from non-biological faults is proposed. simulations show the effectiveness of the method. © 2021 IEEE.

关键词： Electric grounding

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Study on the thermal-electrical balance of the kW-class SOFC stack 17

Study on the thermal-electrical balance of the kW-class SOFC...

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17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021

作者： Li, Biao Lyu, Zewei Han, Minfang Sun, Kaihua Sun, Zaihong Liu, Yang Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Xuzhou Huatsing Jingkun Energy Co. Ltd. Jiangsu Province 221004 China

ISBN: (纸本)9781607685395

Heat and electricity are deeply coupled in solid oxide fuel cell (SOFC) stacks, and the balance and control between them are vital to the steady working condition and outputs. Therefore, studying the balance mechanism of heat and electricity is important to achieve the safe and stable operation of the SOFC stacks. In this paper, a semi-empirical simulation model of a kilowatt-level SOFC stack was established. Based on this model, the effects of different operating temperatures, flow rates, air to H2 ratios (AHR), and steam to carbon (S/C) ratios on the thermoelectric balance state of the SOFC stack were analyzed. Results show that the I-V curve can be separated into three parts: unbalance zone, unsustainable zone, and the self-heat balance zone by the self-heat balance voltage (SHBV) and the critical voltage (CV). The approximate voltage scope of the balance zone under different conditions is 0.6~0.9 V. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Specific heat

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SiC MOSFET Crosstalk Modelling with Suppression Considering Impacts of dv/dt and di/dt 11

SiC MOSFET Crosstalk Modelling with Suppression Considering ...

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

作者： Xie, Wenhao Ji, Shiqi Zhao, Zhengming Mo, Xin Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering China Tsinghua Sichuan Energy Internet Research Institute China

ISBN: (纸本)9788957083505

Compared to Si IGBTs, SiC MOSFETs can reduce switching losses, achieve higher switching frequencies and enable smaller converter size. However, due to the high dv/dt of SiC MOSFETs, certain topologies, such as two SiC MOSFETs in a phase-leg configuration, are highly sensitive to crosstalk, which can slow down switching speed and even reduce gate oxide's lifetime. In this paper, an accurate model of crosstalk is established by considering the impacts of both dv/dt and di/dt in the power loop. The proposed model can simulate the gate-source voltage on bare die of SiC MOSFETs, allowing for a more accurate evaluation of the impact of crosstalk. Model verification is implemented using a double pulse test (DPT) platform and a gate driver with active miller clamp technology. key parameters of the model are extracted from both 3D simulation models and measurement experiments. The DPT waveform of power loop is used as the excitation source in the simulation, and the simulated gate-source waveform shows good agreement with the experimental waveform. Based on the model, parameter sensitivity analysis is performed, and suggestions for improving crosstalk suppression are proposed. © 2023 The Korean Institute of power Electronics.

关键词： Crosstalk

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A novel protection scheme for two-phase faults in power distribution system with neutral ungrounded

A novel protection scheme for two-phase faults in power dist...

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12th IET International Conference on Developments in power System Protection, DPSP 2014

作者： Shi, Shengxing Lei, Aoyu Li, Xin Dong, Xinzhou State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Tsinghua University Beijing 10084 China Shibei Power Supply Company Shanghai Municipal Electric Power Company Shanghai China

ISBN: (纸本)9781849198349

A novel protection scheme for two-phase faults in power distribution system with neutral ungrounded is presented. The feasibility of tripping single-phase circuit when a phase-tophase or two-phase-to-ground fault occurs is studied with induction motor loads as the focus. The paper at first analyses the effect of a induction motor runs with one phase cut off theoretically. And then a real power distribution system model with 110kV, 35kV and 6kV voltage levels is built in PSCAD/EMTDC. Three feasibility criteria are proposed for motors in continuous operation with single-phase opened. At last, the novel protection scheme is testified in simulation with protection time and reclosing time as variables respectively. The results verify that the scheme is feasible and power supply reliability is improved.

关键词： Induction motors

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Effect of UV radiation aging on creepage discharge characteristics of high temperature vulcanized silicon rubber at high altitude

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Plasma Science and Technology 2019年第5期21卷 23-33页

作者： Fubao JIN Yuanxiang ZHOU Bin LIANG Xidong LIANG Zhongliu ZHOU Ling ZHANG Key Laboratory of Plateau Ecology and Agriculture College of Agriculture and Animal HusbandrySchool of Water Resources and Electric PowerQinghai UniversityXining 800016People's Republic of China State Key Lab of Control and Simulation of Power Systems and Gen eration Equipments Departme nl of Electrical EngineeringTsinghua UniversityBeijing 100084People's Republic of China

The physicochemical properties and creepage discharge characteristics of aged high temperature Vulca nized(HTV)silicone rubber materials were investigated by ultraviolet radiati on(UV)aging method in this *** experimental results show that as the aging time increases,the creepage discharge flashover voltage increases first and then *** the aging time has little effect on the creepage discharge inception *** the aging time prolonged,the discharge endurance time of HTV silicone rubber is shortened,and the creepage discharge development velocity is *** the short time of applying voltage to aging material,the magnitude of discharge in creases *** to the partial discharge characteristic parameters of creepage discharge,the whole creepage discharge process is partitioned into four *** with unaged HTV silicone rubber,the aged HTV silicone rubber has less fluctuation in performance parameters and a clear *** study found that UV aging not only affects the physicochemical and hydrophobic properties of the HTV silicone rubber,but also accelerates the development of creepage discharge under AC voltage.

关键词： high temperature vulcanized silicone rubber creepage discharge UV aging inception voltage flashover voltage high altitude characteristic parameters

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Initial-stage performance evolution of solid oxide fuel cells based on polarization analysis 17

Initial-stage performance evolution of solid oxide fuel cell...

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17th International Symposium on Solid Oxide Fuel Cells, SOFC 2021

作者： Wang, Yige Lyu, Zewei Han, Minfang Sun, Zaihong Sun, Kaihua Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing100084 China Xuzhou Huatsing Jingkun Energy Co. Ltd. Jiangsu Province Xuzhou221005 China

ISBN: (纸本)9781607685395

The performance evolution of solid oxide fuel cells (SOFCs) is more pronounced and non-linear in the initial stage, determining the output level during subsequent long-term operation. In this study, an industrial-size (10×10 cm2) cell was tested under 0.1 A cm-2 for 96 hours. I-V-P curves and EIS data under different DC bias (0, 0.05, 0.10, 0.30, 0.50, 0.70 A cm-2) were periodically recorded every 24 hours to investigate the mechanism of initialstage performance evolution. The ohmic loss was identified as the main contributor to the total overpotential, especially under large current density. The cell performance increased during 4-24 h due to the enhancement of anode gas-phase diffusion/conversion processes, while the performance degraded significantly during 48- 96 h caused by the deterioration of anode charge transfer reaction. The EIS evolution trend under different DC bias was consistent, while the evolution degree was larger under smaller current density. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Deterioration

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