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

作者： Lyu, Zewei Han, Minfang Department of Energy and Power Engineering State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing100084 China

ISBN: (纸本)9781607685395

Performance evolution of typical Ni-YSZ anode-supported SOFCs during the initial-stage operation ( 20 h), regardless of the operating current. In the activation stage, the cell performance maintains stable or slightly increases due to the enhanced anode gas-phase diffusion. While in the subsequent aging stage, the cell performance decreases significantly and gradually approaches a plateau in about 100 hours, mainly due to the weakened anode charge transfer reaction and ionic transport processes. Therefore, it is suggested that more efforts should be focused on improving the stability of anode microstructure, especially the stability of anode functional layer. © 2021 Electrochemical Society Inc.. All rights reserved.

关键词： Chemical activation

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simulation Analysis of EFDC of Oil-Paper Insulation under Typical Electrode Structures with the Influence of Harmonic Voltage

Simulation Analysis of EFDC of Oil-Paper Insulation under Ty...

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

作者： Ning Zhang Jian Hao Jing Xu Jixiang Wang Houhe Chen Ruijin Liao Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University Chongqing China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

The primary sources of harmonic distortion in the new power system are a high percentage of access to power electronic equipment and a high percentage of renewable energy grid connections. These factors pose a major risk to the UHV converter transformer oil-paper insulation performance. However, the influence law of harmonic voltage on the electric field distribution characteristics (EFDC) of oil-paper insulation is still unclear; thus, the law of variation of spatial maximum electric field strength (SMEFS) under the action of harmonic voltage and the EFDC on the surface of oil-immersed insulating paper are investigated in this paper by building a two-dimensional simulation model of the electric field distribution of oil-paper insulation under ball-plate and cylinder-plate electrode structure. The results indicate that the two electrode structures' SMEFS are situated in the narrow oil gap between the oil-impregnated insulating paper and the high-voltage electrode; under the influence of the same harmonic components, the insulating paper's surface exhibits an inverse power function decay in the electric field distribution, with the cylinder-plate electrode decaying more quickly than the ball-plate electrode. Meanwhile, for both electrode structures, with the increase of the 5th and 13th harmonics, the SMEFS and the insulating paper surface field strength both increase linearly and are higher than that of the power frequency field strength, while for the 7th and 11th harmonics, the ball-plate electrode weakens the electric field and then increases it with the increase of the harmonic content, whereas the cylinder-plate electrode only increases the electric field.

关键词： Electrodes Renewable energy sources Voltage power system harmonics Harmonic analysis Predistortion power electronics

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Research and Implementation of control Strategies for Multiple Transmission Modes in Yongren-Funing HVDC

Research and Implementation of Control Strategies for Multip...

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2022 IEEE International Conference on power systems and Electrical Technology, PSET 2022

作者： Zhu, Yukun Huang, Libin Li, Shuyong Zhu, Yihua Jia, Xuantao Jia, Xuantao State Key Laboratory of Hvdc Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China Southern Power Grid Guangzhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China Zhejiang Electric Power Co Ltd Ehv Branch Company of State Grid Hangzhou China Xj Electric Co Ltd Xuchang China

ISBN: (纸本)9781665489157

The ± 500 kV Yongren-Funing HVDC transmission project is the first HVDC whose sending and receiving ends are both located in the same province, its inverter station is required to transmit power to different AC asynchronous grids according to the different requirements of the grid operation. The present control and protection system of HVDC cannot adapt to and meet the technical requirements of multiple power transmission modes. In order to achieve this goal, the control system of HVDC must be capable of automatic discrimination and sequential control, selecting the correct strategy of reactive power control (RPC), which is essential for the stable operation of the HVDC system. Therefore, based on the operating conditions of the HVDC system and the switch configuration of the AC switch yard of the inverter station, the principle, process and interlocking conditions of automatic switching between different transmission modes are systematically analyzed. Effects on RPC, last breaker and the over voltage protection of AC busbar are researched. The control strategies for multiple transmission modes have great significance for the similar HVDC/UHVDC transmission projects in the future. © 2022 IEEE.

关键词： Reactive power

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Experimental Study on Dual parameter WeiBull Failure Model of Oil-Paper Insulation in Converter Transformers Considering the Influence of Harmonic Voltage

Experimental Study on Dual parameter WeiBull Failure Model o...

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International Conference on High Voltage Engineering and Application, ICHVE

ISBN: (数字)9798350374988

ISBN: (纸本)9798350374995

The main causes of harmonic distortion in new power systems are high percentage renewable energy grid connections and high percentage power electronic equipment access. These factors pose a serious threat to the ultra-high voltage converter transformers’ ability to perform as oil-paper insulation, and little research has been done on the failure law of oil-paper insulation that takes the effects of harmonic voltage into account. This paper presents the design and construction of a typical oil-paper insulation structure breakdown test platform, as well as the oil-paper insulation breakdown voltage under various frequency and content of harmonic voltage superimposed on the fundamental voltage. The dual parameter WeiBull distribution model is used to investigate the oil-paper insulation failure law under the influence of various harmonic voltage components. The experimental results show that the breakdown voltage of oil-paper insulation significantly decreases relative to the breakdown voltage of power frequency under the action of harmonic voltages with different frequencies and contents, and all follow a dual parameter WeiBull probability distribution. Among them, the minimum $\boldsymbol{U}_{63.2 \%}$ is about 13.47 kV when the 7 th and 11th harmonic voltage are superimposed, and the minimum $U_{63.2 \%}$ is about 13 kV when the 5th and 13th harmonic voltage are superimposed, which is about $\mathbf{2 3 \%}$ lower than the power frequency. Secondly, the fitting distribution of test data under the action of harmonic voltage of different frequencies and contents is approximately parallel, indicating that the failure mechanism of oil-paper insulation is the same.

关键词： Breakdown voltage Renewable energy sources power system harmonics Oil insulation Harmonic analysis Probability distribution power electronics

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The Development of simulation Mirror system and its Application in HVDC

The Development of Simulation Mirror System and its Applicat...

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HVDC (HVDC), International Conference on

作者： Kaijian Ou Wencong Wu Haiqing Cai State Key Laboratory of HVDC Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (数字)9798350387759

ISBN: (纸本)9798350387766

The testing of HVDC new control function and training of HVDC operation personnel require the integration of power system simulation and dispatching automation. This paper presents and builds AC&DC power system simulation mirror system, which is the closed-loop of real-time digital simulation and dispatching automation. Moreover, the applications of simulation mirror system on HVDC new control function testing and HVDC simulation training cabinet are also introduced in this paper.

关键词： Training Automation HVDC transmission power system simulation High-voltage techniques Dispatching Real-time systems Mirrors Personnel Testing

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NUMERICAL simulation OF SURFACE DISCHARGE IN OIL PAPER INSULATION BASED ON FINITE ELEMENT METHOD AND CELLULAR AUTOMATA 22

NUMERICAL SIMULATION OF SURFACE DISCHARGE IN OIL PAPER INSUL...

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22nd International Symposium on High Voltage Engineering, ISH 2021

作者： Chen, Jianning Zhou, Yuanxiang Zhang, Yunxiao Huang, Xin Zhang, Ling State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China

ISBN: (纸本)9781839536052

Surface discharge of oil paper insulation is one of the insulation defects in converter transformers. However, the mechanism of surface discharge in oil paper insulation remains unclear. A novel method of surface discharge in oil paper insulation based on finite element method (FEM) and cellular automata (CA) was proposed to study the mechanism and fractal characteristics. Firstly, the needle-plate electrode without normal component of electric field density was adopted as the geometric model, on which the unstructured triangular mesh generation was performed. Then, the FEM is applied to compute the distribution of potential, electric field and charge in the simulated field, which performed better than finite difference method (FDM) in accuracy and complexity of computation. Finally, the CA model was adopted to simulate the development of surface discharge with the electric field threshold. The results indicated that the numerical simulation model based on FEM-CA can simulate the dynamic process and fractal characteristics of surface discharge in oil paper insulation. According to the fractal dimension curve, the surface discharge can be obviously divided into three stages: inception, propagation and flashover. With the increase of applied voltage, the fractal dimension of surface discharge increases in inception stage, then decreases in propagation stage, and finally increases in flashover stage. © 2021 The Institution of Engineering and Technology.

关键词： Cellular automata

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Over-voltage Analysis of High Penetration PV Integration to Distribution Network Considering Whole-County-PV Development 2

Over-voltage Analysis of High Penetration PV Integration to ...

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2nd International Conference on Electronic Materials and Information Engineering, EMIE 2022

作者： Han, Zhaoyang Zhao, Qianyu Wang, Shouxiang Dong, Yichao Mu, Hao Ministry of Education Nankai District Tianjin300072 China Tianjin Key Laboratory of Power System Simulation Control Nankai District Tianjin300072 China State Grid Tianjin Electric Power Company Hebei District Tianjin300000 China

ISBN: (纸本)9781713865629

The whole county photovoltaic (PV) development will have an impact on the voltage level of the distribution network due to high penetration of PVs. Firstly, the mechanism of distributed PV to raise voltage level is explored. Then, based on Monte Carlo simulation, the analysis method of the influence of PV configuration uncertainty on voltage is proposed. Finally, the back/forward power flow calculation is adopted, taking a 10kV 88-node feeder in Jiangsu as an example. The voltage level under the current condition, the voltage level after adding planned PV capacity and the maximum PV hosting capacity are calculated and analyzed, which provides reference for the promotion of whole-county-PV development in China. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Electric power distribution

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Optimal Location and Capacity Planning of PV in AC/DC Distribution Network Based on Improved Particle Swarm Algorithm 2

Optimal Location and Capacity Planning of PV in AC/DC Distri...

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2nd International Conference on Electronic Materials and Information Engineering, EMIE 2022

作者： Zhao, Qianyu Han, Zhaoyang Wang, Shouxiang Li, Qi Dong, Yichao Mu, Hao Ministry of Education Nankai District Tianjin300072 China Tianjin Key Laboratory of Power System Simulation Control Nankai District Tianjin300072 China State Grid Tianjin Electric Power Company Hebei District Tianjin300000 China

ISBN: (纸本)9781713865629

Distributed generations (DG) such as photovoltaics (PV), as renewable energy sources, can be continuously obtained from nature and have the characteristics of flexible integration and environmental friendliness. The location and capacity of PV is an important part of the planning and design of AC and DC distribution network, it is related to the distribution of AC and DC distribution network voltage, and affects the stability of the entire AC and DC distribution network voltage. In this paper, firstly, a PV location and capacity optimization model is built with the goal of minimizing the annual investment cost of PV and the expected value of network loss. Then, an Immune Chaos Hybrid Particle Swarm Optimization (ICHPSO) method is adopted to solve the planning of the PV system in AC and DC distribution network. Finally, the configuration optimization method is implemented and verified with test systems. The results show that the proposed planning method realizes the improvement effect of PV on the node voltage, and the optimization algorithm used has good convergence characteristics and the ability to quickly find the global optimization. Compared with the results of deterministic analysis, the annual investment cost when considering the uncertainty of the load source is smaller, and it can better reflect the actual situation, which verifies the rationality of the planning model proposed in this paper. © VDE VERLAG GMBH ∙ Berlin ∙ Offenbach.

关键词： Global optimization

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Research on relay setting attack defense in power systems based on a three-layer optimization model

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Frontiers in Energy Research 2024年 12卷

作者： Ren, Liu Binyuan, Yan Hengdao, Guo Junrong, Liu Yihua, Zhu Yun, Fu Liang, Tu Zeyuan, Zhou State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid 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 CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China Information Centre of Guizhou Power Grid Co. Guizhou China

With the intelligent development of power systems, the number of relays continues to increase. Differences in manufacturers, systems, and protocols lead to growing security risks. Tampering with relay settings could potentially cause power outages or even system instability. Consequently, relay settings have gradually become a key target for cyberattacks, particularly in smart grids where traditional defense measures struggle to effectively address complex and diverse attack scenarios. To address this issue, this paper proposes a three-layer optimization defense model based on game theory, designed to adapt to various attack scenarios. The core methodology of this model includes a three-layer structure: The first layer optimizes the protection level of each relay by allocating limited defense budgets. The second layer analyzes the potential system damage based on the attacker’s strategy choices. The third layer comprehensively calculates system losses to evaluate the effectiveness of defense plans. Through layer-by-layer optimization of budget allocation, the model minimizes the unsupplied energy loss caused by relay setting attacks. Compared to existing methods, this model not only improves defense effectiveness under resource constraints but also addresses multiple complex attack scenarios. Experimental results demonstrate that this model significantly enhances the system’s defense capabilities and effectively reduces the impact of attacks on system security operations. Copyright © 2024 Ren, Binyuan, Hengdao, Junrong, Yihua, Yun, Liang and Zeyuan.

关键词： Budget control

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control and Stability of Large-scale power system with Highly Distributed Renewable Energy Generation:Viewpoints from Six Aspects

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CSEE Journal of power and Energy systems 2023年第1期9卷 8-14页

作者： Qing-Hua Wu Anjan Bose Chanan Singh Joe H.Chow Gang Mu Yuanzhang Sun Zhaoxi Liu Zhigang Li Yang Liu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China School of Electrical Engineering&Computer Science Washington State UniversityPullmanWA 99164USA Department of Electrical and Computer Engineering Texas A&M UniversityCollege StationTX 77843USA Department of Electrical Computer and Systems EngineeringRensselaer Polytechnic Institute(RPI)TroyNYUSA Key Laboratory of Modern Power System Simulation and Control&Renewable Energy Technology Ministry of Education(Northeast Electric Power University)Jilin 132012China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China

power systems are moving toward a low-carbon or carbon-neutral future where high penetration of renewables is *** conventional fossil-fueled synchronous generators in the transmission network being replaced by renewable energy generation which is highly distributed across the entire grid,new challenges are emerging to the control and stability of large-scale power *** analysis and control methods are needed for power systems to cope with the ongoing *** the CSEE JPES forum,six leading experts were invited to deliver keynote speeches,and the participating researchers and professionals had extensive exchanges and discussions on the control and stability of power ***,potential changes and challenges of power systems with high penetration of renewable energy generation were introduced and explained,and advanced control methods were proposed and analyzed for the transient stability enhancement of power grids.

关键词： Distributed energy resources high converter penetration power system control renewable energy generation stability control transient stability

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