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Implications of COVID-19 for the Electricity Industry: A Comprehensive Review

CSEE Journal of power and Energy systems 2020年第3期6卷 489-495页

作者： Haiwang Zhong Zhenfei Tan Yiliu He Le Xie Chongqing Kang Department of Electrical Engineering the State Key Lab of Control and Simulation of Power Systems and Generation EquipmentInstitute for National Governance and Global GovernanceTsinghua UniversityBeijing 100084China Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX 77843 USA

As COVID-19 sweeps through the whole world,human activities have been changed *** such circumstances,the electricity sector is deeply affected and faced with great *** paper provides a comprehensive review of the impacts that the pandemic has caused on the electricity *** demand has dropped sharply as governments around the world executed lockdown restrictions,while the load composition and daily load profile have also *** share of renewable generation has increased against the decline of the total electricity *** power balance situation and increased uncertainty of demand have posed higher pressure on system operators,along with voltage violation issue and challenges for system maintenance and *** electricity market is also substantially influenced,while longterm investment in clean energy is expected to be *** externality such as emission reduction is also discussed.

关键词： COVID-19 electricity industry energy market pandemic power system

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Switching Current Imbalance Mitigation for Paralleled SiC MOSFETs Using Common-mode Choke in Gate Loop 12

Switching Current Imbalance Mitigation for Paralleled SiC MO...

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12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020

作者： Liu, Jiye Zheng, Zedong Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipments Department of Electrical Engineering Beijing China

ISBN: (纸本)9781728158266

Paralleling SiC MOSFETs is a popular way to increase the current capacity. However, due to asymmetric layout, device parameter mismatch and other factors, imbalanced switching or dynamic current is observed among the paralleled switches in multi-device paralleling application which results in unequal switching loss, challenging the security and reliability of the system. In this paper, a common-mode choke in the gate loop is proposed and analyzed to suppress the imbalanced switching current induced by asymmetric layout in a half-bridge configuration with a Kelvin-source connection. The mechanism of the proposed method is comprehensively investigated to show that though the common-mode choke is placed in the gate loop, it can also mitigate the imbalanced current caused by asymmetric power loop. And it also shows that only the leakage inductance of the choke is seen in the gate loop and thus the switching speed is not expected to be influenced. The proposed method can be easily extended to multi-device paralleling application and the switching transients is hardly influenced by the common-mode choke. simulation and experimental results are presented to verify the proposed method. © 2020 IEEE.

关键词： Silicon

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Research on shielding failure of UHVDC based on leader progression model

Research on shielding failure of UHVDC based on leader progr...

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2012 31st International Conference on Lightning Protection, ICLP 2012

作者： Geng, Yinan Zhuang, Chijie Institute of Nuclear and New Energy Technology Tsinghua University Beijing China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China

ISBN: (纸本)9781467318976

Shielding failure is one of key problems of UHV transmission lines. Considering the high operating voltage and high tower of UHV transmission lines, the inception criterion of upward leader is proposed in this paper. The process of shielding failure is simulated by the method based on leader progression model and shielding failure rate is calculated. This method is verified by comparing the calculation results with the operated data of UHV transmission lines in Japan. The shielding failure characteristics of UHVDC transmission lines in China under different terrain conditions are researched. © 2012 IEEE.

关键词： Electric lines

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Application and Practice of Digital Twin Technology in Monitoring Status of power equipment in Converter Valve Hall

Application and Practice of Digital Twin Technology in Monit...

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2023 International Conference on Intelligent Communication and Computer Engineering, ICICCE 2023

作者： Yongsheng, He Baojia, Deng Zongxiang, Lu Shiling, Zhang Liangjun, Dai State Grid Chongqing Electric Power Company Electric Power Research Institute China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Deptartment of Electrical Engineering Tsinghua University China

ISBN: (纸本)9798350395617

The internal power equipment of ultrahigh voltage converter valve hall is numerous and complex in structure, involving the various information elements such as the temperature and vibration. Moreover, the gas inside ultra-high voltage converter bushing is SF6 gas. Under the current over-load condition of the converter bushing, SF6 gas will decompose. This article focuses on the SF6 gas equipment inside the ultrahigh pressure converter valve hall as the research object, and analyzes specific types and content of SF6 gas decomposition products. In order to effectively detect gas content in the digital twin model of the converter transformer bushing, the new portable SF6 gas chromatograph, laser detection technology and device for HF gas, and partial discharge detection technology research using the acoustic electric coupling method are carried out, providing the effective means for onsite detection of hidden faults in operating equipment. Research has shown the digital twin technology can effectively detect the absorption spectra of gases such as O2, H20, CO, CO2, CF4, SO2, H2S, SOF2, and SO2F2. On the other hand, through digital twin partial discharge detection technology, it is effectively found that the SO2 inside the UHV converter sleeve is 29μL/L, H2S is 4μL/L, CO is 36μL/L, HF=0, detected SO2 and H2S components, determined as the insulation heating defect. The research results of paper provide theoretical and data support for operation status monitoring of SF6 gas insulated power equipment inside the ultra-high voltage converter valve hall. © 2023 IEEE.

关键词： Sulfur hexafluoride

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Experimental Research on Typical Single-Phase High Resistance Grounding Fault Detection Methods in Resonant Grounding Distribution System 8

Experimental Research on Typical Single-Phase High Resistanc...

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8th IEEE International Conference on Advanced power System Automation and Protection, APAP 2019

作者： Cui, Xin Wang, Bin Dong, Xinzhou Liu, Kun Tsinghua University Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing China Key Lab for Power System Protective Relaying Real Time Digital Simulation of Guangdong Power Grid Dispatching and Controlling Center of Guangdong Power Grid Guangzhou China

ISBN: (纸本)9781728117225

The problem of high resistance grounding fault detection in resonant grounding system is always the pain point and difficulty in the field of power system research. To solve the problem, based on PSCAD software, this paper firstly establishes a typical distribution system model, and analyzes the relationship between the transient component, traveling wave component and the fault initial angle, transition resistance value and arc. Secondly, this paper analyzes the effect of the main fault detection methods such as transient methods and travelling wave method, and gives the effective domain of different detection methods. Above analysis establishes a complete systematic test scheme for the high resistance grounding fault detection, and provides an effective test support for the subsequent effectual fault detection method for high resistance grounding fault. © 2019 IEEE.

关键词： Fault detection

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Distribution system fault location method using reclosure-generating traveling waves

Distribution system fault location method using reclosure-ge...

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2020 IEEE power and Energy Society General Meeting, PESGM 2020

作者： Dong, Xinzhou Wang, Haozong Xin, Zeyu Shi, Shenxing Wang, Bin Tsinghua University State Key Lab. of Control and Simulation of Power System and Generation Equipment Dept. of Electrical Engineering Beijing China

ISBN: (纸本)9781728155081

Fault location in distribution systems includes 2 subtasks: fault distance estimation and fault section identification. This paper presents a fault location method based on reclosure-generating traveling waves and system topology. Firstly, the reclosure-generating traveling waves under normal and fault conditions are analyzed to find the traveling wave reflected by fault point, through which the fault distance could be estimated. Secondly, we propose a fault section identification method by comparing real measured traveling waves with simulated traveling waves with different potential fault points. Noticing that only time information of traveling waves rather than their magnitude is necessary, instead of using electromagnetic transient simulation, we also present a simplified simulation algorithm that only focuses on the arrival time of traveling waves based on priority queue. Experiments demonstrate that the proposed method can locate fault points in high accuracy with low computational burden. © 2020 IEEE.

关键词： Location

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Study on High Impedance Grounding Fault Protection for Personal Safety Guard in Distribution Grid 8

Study on High Impedance Grounding Fault Protection for Perso...

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8th IEEE International Conference on Advanced power System Automation and Protection, APAP 2019

作者： Liu, Kun Cui, Xin Wang, Bin Dong, Xinzhou Key Lab for Power System Protective Relaying Real Time Digital Simulation of Guangdong Power Grid Dispatching and Controlling Center of Guangdong Power Grid Guangzhou China Tsinghua University Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing China

ISBN: (纸本)9781728117225

In recent years, human electric shock accident caused by line fault of distribution system has happened all over the world. This kind of problem of high resistance grounding fault safety is becoming more and more the attention of the researchers. In this paper, typical arc high resistance grounding fault model is established to simulate the human electric shock accident and the line fell to the ground condition. The transient- state and steady-state fault characteristics of high resistance grounding fault are analyzed in the neutral point grounded through a small resistance grounding system and the resonant grounding system. The above analysis has laid a good foundation for the establishment of an effective fault detection method for high resistance grounding and the realization of human electric shock protection. © 2019 IEEE.

关键词： Fault detection

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Capacity Allocation of Hybrid power System with Hot Dry Rock Geothermal Energy,Thermal Storage,and PV Based on Game Approaches

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Journal of Modern power systems and Clean Energy 2023年第1期11卷 290-301页

作者： Yang Si Laijun Chen Xuelin Zhang Xiaotao Chen Shengwei Mei Qinghai Key Lab of Efficient Utilization of Clean Energy(Tus-Institute for Renewable Energy) University of QinghaiXining 810016China State Key Laboratory of Control and Simulation of Power System and Power Generation Equipment(Electric Machinery Department Tsinghua University)Beijing 100084China Technical Institute of Physics and Chemistry Beijing 100190China IEEE

This study utilizes hot dry rock(HDR)geothermal energy,which is not affected by climate,to address the capacity allocation of photovoltaic(PV)-storage hybrid power systems(HPSs)in frigid plateau *** study replaces the conventional electrochemical energy storage system with a stable HDR plant assisted by a flexible thermal storage(TS)*** HPS consisting of an HDR plant,a TS plant,and a PV plant is *** approaches are introduced to establish the game pattern model of the proposed HPS as the *** annualized income of each player is used as the payoff ***,non-cooperative game and cooperative game approaches for capacity allocation are proposed according to the interests of each player in the proposed ***,the proposed model and approaches are validated by performing calculations for an HPS in the Gonghe Basin,Qinghai,China as a case *** results show that in the proposed non-cooperative game approach,the players focus only on the individual payoff and neglect the overall system *** proposed cooperative game approach for capacity allocation improves the flexibility of the HPS as well as the payoff of each game ***,the HPS can better satisfy the power fluctuation rate requirements of the grid and increase the equivalent firm capacity(EFC)of PV plants,which in turn indirectly guarantees the reliability of grid operation.

关键词： Capacity allocation equivalent firm capacity game theory hot dry rock hybrid power system

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CCF early warning method of LCC-HVDC based on XG boost algorithm 8

CCF early warning method of LCC-HVDC based on XG boost algor...

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8th Renewable power generation Conference, RPG 2019

作者： Li, Zhizhong Wang, Bin Wang, Haigang Yu, Bin Xie, Min Chen, Shi Dong, Xinzhou Key Lab of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing100084 China State Grid Anhui Electric Power Company Hefei 230061 China

ISBN: (纸本)9781839531255

The lack of analytical mechanism of continuous commutation failure (CCF) process hinders the development of CCF early warning algorithm and further obstructs the coordination strategy of relay protection between AC and DC size in hybrid grid. However, summarizing the protection threshold of CCF in the form of electrical quantity analytically under different fault types is a nontrivial pattern recognition problem. To overcome the difficulty of directly analysing the electromagnetic process of CCF, a statistical learning modelling approach is adapted to propose a CCF warning system, in which XGBoost algorithm was used as the backbone to regress on the relationship between AC/DC electrical quantities and the possibility of the occurrence of CCF. The design of the feature vector in XGBoost-based classifier considers not only the analytical expression of key electrical quantity during single commutation failure but also the important state variable of control system. Additionally, a special data windowing method was proposed to enrich of information encoded by the feature vector while ensuring the speed requirement posed by the protection system. Validation on multi-fault scenes simulation shows that the proposed early warning system can trigger warning signal correctly with sufficiently small measured data required, proving the practicability in engineering practice. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： HVDC power transmission

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Potential Evaluation of Distributed Energy Resources with Affine Arithmetic

Potential Evaluation of Distributed Energy Resources with Af...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Cheng, Lin Qi, Ning Guo, Yanfei Liu, Nan Wei, Wei State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Tsinghua University Beijing China State Grid Beijing Daxing Power Supply company Beijing China

ISBN: (纸本)9781728135205

With the rapid development of Energy Internet, the penetration of distributed energy resources is gradually increasing. New methods for potential evaluation of DERs is becoming more and more important for planning, operation, and control. In this paper, the traditional affine arithmetic-based forward-backward power flow calculation method is introduced. Then, modified method is proposed mainly considers arithmetic correction, weekly looped structure, and different types of DG. Moreover, comprehensive potential evaluation structure for DERs is proposed based on affine arithmetic which involves three parts. Finally, through numerical analysis, the applicability and error of the affine arithmetic method are analyzed. © 2019 IEEE.

关键词： Internet of Energy

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