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IEEE Asia Power and Energy Engineering Conference (APEEC)

作者： Fangyi Li Guangyao Qiao Weiguo Li Guoliang Zhao Xianshan Guo Weiqi Wang Wei Wang State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. LTD Beijing China State Grid Corporation of China Beijing China North China Electric Power University Beijing China

Metal oxide arrester can limit the operation of overvoltage by absorbing the energy of overvoltage to a certain extent. However, in UHV system, the conventional zinc oxide arrester still has shortcomings in terms of economy, voltage limiting effect and operation reliability. In order to overcome these shortcomings, some scholars put forward the method of using the power electronic controllable arrester to change the volt-ampere characteristics of zinc oxide arrester and limit the system operating overvoltage. There has been a lot of preliminary research work on the power electronic controllable arrester, but the on-line monitoring of its switch has not been carried out *** this paper, the influence of arrester fault on the overall potential distribution was determined by simulation, and an experimental research platform was established to carry out leakage current experiments on single-layer power electronic switches under different volttimes and temperatures, so as to study the influence of temperature change and single-layer short circuit on resistance current. By detecting the resistance component of arrester leakage current, The change rate of resistance current cubed before and after failure is taken as the characteristic quantity to realize the fault monitoring of controllable arrester.

关键词： Temperature measurement Arresters Electric potential Temperature distribution Switches Control systems Power electronics

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Characteristic harmonics suppression strategy for LCC-MMC based HVdc system

Characteristic harmonics suppression strategy for LCC-MMC ba...

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20th International Conference on AC and dc Power Transmission 2024 (ACdc 2024)

作者： Yang Shi Dong Liu Yunfeng Li Jialin Zhang State Grid Corporation of China Beijing People's Republic of China National Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute CO. LTD Beijing People's Republic of China National Key Laboratory of Power Grid Disaster Prevention and Reduction Changsha University of Science and Technology School of Electrical & Information Engineering Changsha People's Republic of China

ISBN: (数字)9781837241552

This paper proposes a characteristic harmonics suppression strategy for the LCC-MMC based HVdc system using the MMC. Firstly, the topology of the LCC-MMC based HVdc system is introduced, in which the sending end converter station adopts the LCC-MMC hybrid converter valves despite of the structure of receiving end converter. Secondly, in the outer voltage loop of the MMC, high pass filters, band pass filters, and notch filters are used to extract the characteristic harmonics of the LCC converter for performance comparison, and they are reverse superimposed onto the reference current. In the inner current loop, a PIR control strategy is proposed to track and compensate for the characteristic harmonics without influence on the fundamental components. Finally, the LCC-MMC based HVdc system is constructed in MATLAB/Simulink to verify the effectiveness of the proposed characteristic harmonics suppression strategy.

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key technologies and development trends of VSC-HVdc transmission for offshore wind power

Renewable Energy System and Equipment

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Renewable Energy System and Equipment 2025年第1期1卷 35-49页

作者： Zhiyuan He Jie Yang Guangfu Tang Yuexi Yang Zhenyu Du Sheng Zhang State Key Laboratory of Advanced Power Transmission Technology (China Electric Power Research Institute Co. Ltd.) Beijing 100192 China Beijing Huairou Laboratory Huairou District Beijing 101400 China China Beijing Key Laboratory of DC Grid Technology and Simulation (China Electric Power Research Institute Co. Ltd.) Beijing 100192 China

Developing offshore wind power, particularly in deep waters, is recognized as a vital approach to tackling the energy crisis and facilitating a low-carbon transition. VSC-HVdc transmission, leveraging its technological prowess, has emerged as the principal means for transmitting large-scale, remotely located offshore wind energy. In recent years, numerous VSC-HVdc grid interconnection projects for offshore wind farms have been commissioned globally, with the technology itself continually advancing and improving. This paper, in light of prevailing technological trends, provides a comprehensive overview of the advancements in key technologies within VSC-HVdc transmission tailored to the requirements of offshore wind power evacuation, encompassing system topology, operating modes, control and protection systems, essential equipment, and platform configurations. It further details the profiles of representative offshore wind power VSC-HVdc transmission and grid connection projects currently operational or under construction, and delves into the prospective development trajectories and future research avenues for offshore wind power VSC-HVdc transmission technology.

关键词： VSC-HVdc Offshore wind power System topology Control and protection Core equipment Offshore platform

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A Coordinated MMC Control Strategy of Integrated Photovoltaic/Battery System

A Coordinated MMC Control Strategy of Integrated Photovoltai...

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IEEE International Conference on Energy Internet (ICEI)

作者： Yuexi Yang Xiao Zhou Sichao Wang Chunpeng Li Junwei Huang Wenzheng Xu State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd. Beijing China Fujian Key Laboratory of Protection and Operation Control for Smart Grid State Grid Fujian Electric Power Research Institute. Fuzhou China National Research Center for Active Distribution Network Technology Beijing Jiaotong University. Beijing China

The grid-connecting control and maximum power point tracking control of photovoltaic inverters have long been the research focus in the field of solar power generation. In this paper, a new coordinated modular multilevel converter (MMC) control strategy based on virtual synchronization and MPPT is proposed for grid-connected inverters in the PV/Battery system. The proposed strategy realizes frequency and voltage droop control with the synchro's inertia and damping characteristics, and improves the power angle stability as well as system voltage stability. simulation results in MATLAB/Simulink verifies the feasibility and effectiveness of the proposed control strategy.

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The Influence of Electrified Railway Traction Power Supply System on the Power Quality of Regional Power grid

The Influence of Electrified Railway Traction Power Supply S...

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Sensors, Electronics and Computer Engineering (ICSECE), IEEE International Conference on

作者： Hongjun Yang Xiong Du Bin Chen Yuelong Cao Lianqing Zheng Heng Wang National Key Laboratory of Power Transmission Equipment Technology Chongqing University Chongqing China Smart Grid Research Institute State Grid Corporation of China Beijing China

In recent years, the construction of high-speed railway in China has developed rapidly. However, the nonlinear characteristics of electrified railway load make it possible to cause power quality problems when it is connected to the regional power grid. In order to study the power quality risk of railway traction power supply system connected to the power grid, the Lalin Railway is taken as an example. Based on PSCAD software, the simulation model of each traction station and its surrounding power grid along the Lalin railway is established. Considering the system operation mode, traction station access mode and traction load factors, the power quality problems such as harmonics, three-phase voltage unbalance factor and voltage deviation are analyzed in depth, and the characteristics and risk points of power quality problems after the connection of Lalin Railway to the power grid are clarified. The research in this paper can provide a theoretical basis for subsequent power quality management.

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Space Charge Distribution in Submarine Cable Factory Joint Insulation

Space Charge Distribution in Submarine Cable Factory Joint I...

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International Conference on Electrical Materials and Power Equipment (ICEMPE)

作者： Xiaoning Shi Wenpeng Li Meng Zhang Yang Liu Xin Chen Chong Zhang Wei Zhao Lisheng Zhong Jinghui Gao State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Beijing China State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an China

This passage discusses the high voltage direct current (HVdc) cable employed in submarine power transmission and its weaknesses, specifically the submarine cable factory joint. The recovered process of insulation when manufacturing the joint involves reheating the cable bulk insulation near them, which can cause changes in the dielectric properties and crystalline morphology of cross-linked polyethylene (XLPE). This can result in accumulated space charge and distorted electric field at the interface between the cable bulk insulation and factory joint recovery insulation due to a mismatch of dielectric parameters. The paper discusses the use of both experimental and simulation research to observe the distribution of space charge in submarine cable factory joint insulation. The results show that homo-polarity space charge accumulates more significantly with increasing polarization voltage, and space charge accumulation decreases gradually with temperature rising. Factory joint recovery insulation shows more severe charge accumulation compared to cable bulk insulation, especially at $50^{\circ}\mathrm{C}$ and $70^{\circ}\mathrm{C}$. The maximum amount of space charge accumulation occurs when approaching the interface between the two insulations as far as possible, resulting in severe uneven electric field.

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Development of a Series HVdc Cable Accessories Based on Silicone Rubber

Development of a Series HVDC Cable Accessories Based on Sili...

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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Haitian Wang Yi Luo Mingyu Zhou Ruoyu Xu Tobias Fechner Wenpeng Li Pengxian Song HEM Group Global Energy Interconnection Research Institute Europe GmbH Berlin Germany State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Company Ltd Beijing China State Grid Tianjin Electric Power Research Institute Tianjin China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

The main insulation materials for cable accessories include silicone rubber (SR) and ethylene propylene diene monomer (EPDM) rubber. Compared with EPDM rubber, SR material has become the preferred material for AC cable accessories due to its good electrical, thermal and mechanical properties. Because the electric field distribution mechanisms of dc cables and AC cables are different, the electric field distribution depends on the insulation dielectric constant under AC voltage and the insulation resistivity under steady-state dc voltage. The application of SR materials in dc cable accessories has been affected to a certain extent by factors such as resistivity and space charge accumulation. The authors of this paper modified SR materials and developed medium-voltage, high-voltage, and ultra-high-voltage dc cable accessories, verifying that the electrical, thermal and mechanical properties of SR are also suitable for dc cable accessories.

关键词： Power cables HVdc transmission Power cable insulation Voltage Mechanical cables Conductivity Space charge Mechanical factors Rubber Electric fields

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Strategy for Multi-Time-Scale Coordinated Operation of Virtual Power Plant Clusters with Electric Energy Interaction Sharing

Strategy for Multi-Time-Scale Coordinated Operation of Virtu...

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System simulation technology and its Application (CCSSTA), IEEE China Conference on

作者： Yanru Liu Yue Guo Mingxuan Lu Longyu Zhang Yuan Ren Xiangyu Kong State Grid Economic and Technological Research Institute Co. Ltd Beijing China State Grid Liaoning Electric Power Supply Co. Ltd Economic Technology Research Institute Shenyang China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China

ISBN: (数字)9798350366600

ISBN: (纸本)9798350366617

The Virtual Power Plant (VPP) can break geographical limitations and achieve wide-area energy interconnection and sharing. To address the differences in “generation-load” resources among different VPPC within the same region and to solve the real-time power balance issues caused by the volatility of distributed renewable energy (DRE) and the uncertainty of electricity consumption behavior, a cluster service provider is introduced to manage the clusters containing various types of VPPC. Independent pricing for internal energy exchanges within the VPP cluster is implemented to incentivize VPPC to participate in coordinated dispatch. Considering the predictability of random variables and the cumulative errors that increase with decision-making time, a two-stage joint optimization model is established, which includes day-ahead coordinated dispatch and intra-day rolling optimization. The day-ahead stage focuses on the participation of multiple VPP clusters in external market transactions and internal energy exchanges, while the intra-day stage focuses on balancing VPP power to reduce deviations, forming a multitime-scale scheduling strategy for energy sharing and interaction among multiple VPPC. Finally, a simulation analysis is conducted using a multi-VPP cluster system integrating various distributed energy sources as an example. The results demonstrate that the power balance issues within the VPP cluster system are effectively improved, significantly enhancing the overall operational economy.

关键词： Renewable energy sources Uncertainty Power supplies Electricity Pricing Virtual power plants Real-time systems Systems simulation Random variables Reliability

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Research on Soft Switching Optimization Control Strategy for ANPC Half-bridge DAB under Wide Voltage Range

Research on Soft Switching Optimization Control Strategy for...

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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Zhiguang Lin Kailong Chen Weihua Deng Jie Li Naizheng Han State Grid Smart Grid Research Institute Co. Ltd North China Electric Power University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China School of Electrical and Electronic Eengineering North China Electric Power University Beijing China

In order to improve the operating efficiency of the ANPC half-bridge DAB, this paper proposes an optimized control strategy based on soft switching trajectory. First of all, by analyzing the ANPC half-bridge DAB device current to realize the control variable constraints of soft switching, and then determined the soft switching area of DAB in the PV. In order to achieve soft switching of the device in the wide voltage range and the full power range, a control variable adjustment trajectory is formulated, and a soft switching optimization control strategy containing mode selection is obtained. simulation analysis shows that when the input voltage of the DAB is higher than the output voltage, the DAB device can achieve soft switching within the full power range. And when the input voltage of the DAB is lower than the output voltage and the transmission power of the DAB is higher, the device can also achieve soft switching. The simulation verifies the correctness of the theoretical analysis and the effectiveness of the proposed control strategy.

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Application of Silicon Controlled Rectifiers in Low Power Circuits 4

Application of Silicon Controlled Rectifiers in Low Power Ci...

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4th IEEE International Conference on Power, Intelligent Computing and Systems, ICPICS 2022

作者： Li, Jiarui Wang, Shulong Li, Yuhang Pan, Jinbin Ma, Lan Yang, Zhao Mi, Chaoyong Xidian University Microelectronic School Shaanxi Xi'an China State Grid Key Laboratory of Power Industry Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd Beijing China

ISBN: (数字)9781665467735

ISBN: (纸本)9781665467735

With the advancement of microelectronics technology, the resistance of the device itself to ESD (Electrostatic Discharge) is constantly weakened, so the study of ESD is of great significance. SCR (Silicon Controlled Rectifier) has the advantages of low on-resistance and strong protection ability, but its disadvantage is that the holding voltage is low and the trigger voltage is high. This paper deals with a new type of SCR, which is based on MLSCR (Modified Lateral SCR), with an NMOS embedded in the cathode and a shallow well embedded under the N-well and P-well (SP-SN-SCR). The new structure is modeled in sentaurus TCAD and tested in simulation. The test results show that, compared with the traditional structure, the holding voltage of the SP-SN-SCR is 4.9 V, the turn-on voltage is 5.8 V, and the secondary breakdown current is also large. © 2022 IEEE.

关键词： Electric rectifiers

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