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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Cui, Liu Peng, Guangqiang He, Jingsong Wu, Jiyang Mao, Chizu Jiao, Ning Electric Power Research Institute China Southern Power Grid State Key Laboratory of Hvdc 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 Maintenance Test Center Ehv Power Transmission Company Guangzhou China Csg Key Laboratory for Dc Transmission Equipment State Evaluation and Fault Diagnosis GuangZhou China Sichuan University College of Electrical Engineering and Information Technology Chengdu China

ISBN: (纸本)9781665414395

Modular multilevel converter (MMC) is currently the most concerned voltage source converter topology in the field of flexible direct current transmission (VSC-HVdc). Due to its non-linear characteristics, harmonic components will inevitably be generated in AC and dc systems, which may affect the operation of equipment and system, cause protection equipment to malfunction, and cause interference to neighboring communications. The MMC converter is a non-linear device, which can be considered as an amplifying modulator with voltage and current conversion functions. The AC and dc networks are coupled to each other through the MMC converter to generate dynamic harmonic interaction. In recent years, harmonic instability problems have appeared in many VSC-HVdc projects. Compared with other converter topologies, the transfer relationship of harmonics on the AC and dc sides of MMC converters has not been studied in depth. In this paper, by studying the AC/dc harmonic conversion characteristics of MMC converters, it reveals the conversion law of MMC converters between AC/dc harmonics;through theoretical derivation, the quantitative calculation method of MMC harmonic transmission process is given. PSCAD simulation results prove the correctness of the above results. © 2021 IEEE.

关键词： Transmissions

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Development and prospect of direct‐current circuit breaker in China

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High Voltage 2021年第1期6卷 1-15页

作者： Weijiang Chen Rong Zeng Junjia He Yi Wu Xiaoguang Wei Taixun Fang Zhanqing Yu Zhao Yuan Yifei Wu Wandi Zhou Bing Yang Lu Qu STATE GRID Corporation of China BeijingChina Department of Electrical Engineering Key Laboratory of Control and Simulation of Power System and Generation EquipmentTsinghua UniversityBeijingChina School of Electric and Electronic Engineering Huazhong University of Science&TechnologyWuhanChina School of Electrical Engineering Xi'an Jiaotong UniversityXi'anChina Global Energy Interconnection Research Institute Co. LtdBeijingChina NR Electric Co. LtdNanjingChina

The direct‐current circuit breaker(dcCB)is the most ideal choice for dc fault isolation in dc *** a late start,China's research and development on the dcCB have made outstanding *** article provides a brief glance of current China's dcCB development *** begins by sorting out the technical route according to the topology of *** it systematically summarises both mechanical and hybrid dcCBs with focussing on the aspects of topology structure and principle,key technology and characteristics,prototype development and *** is apparent that Chinese scientists and engineers confronted the worldwide problem of large capacity dc breaking,and put forward a comprehensive solution which consists of an innovative topology structure based on coupled negative voltage circuit,breaking throughs on the key technologies such as highly controllable and reliable fault current commutation,millisecond‐level ultra‐fast and efficient electromagnetic repulsion mechanism,high tolerance and high stability power electronic switch,low residual voltage and fast response energy consumption device,*** article states that the world's first set of hybrid high‐voltage(HV)dcCB,and the first set of mechanical HV dcCB have been *** dcCBs will soon be deployed to the dc grids which have the highest voltage levels therefore require the strongest breaking *** achievements are leading the world in the development and application of *** article also discusses the overall development trends of dcCB in the areas of new topologies,key techno-logical breakthroughs and application scenarios,*** discussions serve as references for dcCB's future technological advancement and its ever‐expanding applications.

关键词： breaking breakthrough discussions

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Analysis And Calculation Of The Short-Circuit Current Of Xiamen VSC-HVdc Project

Analysis And Calculation Of The Short-Circuit Current Of Xia...

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IEEE Conference on Energy Internet and Energy System Integration (EI2)

作者： Lin Zhu Huaiguang Gu Fangyuan Li Longze Kou Dong Liu State Key Laboratory of Advanced Power Transmission Technology Beijing Key Laboratory of DC Grid Technology and Simulation Global Energy Interconnection Research Institute Beijing China State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute Beijing China

ISBN: (纸本)9781665434263

For the heavy load urban power grid, the short-circuit current is closed to the breaking capacity of the AC breaker. After the voltage sourced converter high voltage direct current (VSC-HVdc) is connected, the short-circuit current of VSC-HVdc will be provided during the fault period, which will cause the short-circuit current exceed the standard value and affect the normal operation of the power grid. Taking the Xiamen VSC-HVdc project as an example, this paper analyses the VSC-HVdc control mode, obtains the short-circuit current calculation method. The Xiamen AC / dc hybrid model is built, and the correctness of the proposed method is verified by simulation. The results show that the amplitude and phase angle of the VSC-HVdc short-circuit current have great influence on the total short-circuit current, and the amplitude is easily controlled by the current limiting controller, so the phase angle control should be emphasized. For Point of Common Coupling (PCC), the short-circuit current of single-phase grounding fault may be larger than three-phase grounding fault, which should be taken into account. The ideas provided in this paper have practical engineering significance for the city power supply by VSC-HVdc.

关键词： Reactive power Grounding Short-circuit currents simulation Urban areas System integration Transformers

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Mass Heterogeneous Terminal Consensus and Management Model of power Internet of Things Based on Blockchain

Mass Heterogeneous Terminal Consensus and Management Model o...

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2021 IEEE International Conference on Electronic technology, Communication and Information, ICETCI 2021

作者： Shang, Boxiang Zhai, Wei Wang, Jianan Liu, Wei Du, Yazhou Li, Yingzhuo State Grid Tianjin Electric Power Company Tianjin China State Grid Tianjin Information & Elecommunication Company Key Laboratory of Energy Big Data Simulation of Tianjin Enterprise Tianjin China State Grid Info & Telecom Co. Ltd. Beijing China-Power Information Technology Co.Ltd. Beijing China Artificial Intelligence Academy Tianjin University of Science and Technology Tianjin China

ISBN: (纸本)9781665432511

As the application of the Internet of things in the smart grid, the Internet of things involves a variety of professional terminal equipment, different professional terminal equipment have different understanding of power grid resources, and use different protocols in data maintenance and transmission. This reduces the efficiency of the Internet of things and increases the construction and operation costs of the whole power grid system. In this paper, electronic voting, which is relatively recognized by most enterprises and institutions, is used to solve the problems caused by the lack of consensus and unified standards in the Internet of things. Based on the blockchain technology, an electronic voting model is designed to ensure that the voting results are untampered and auditable, and intelligent contract technology is used to ensure that the function of the voting model runs according to the logic of the code and will not be artificially interfered with. It replaces some functions such as the operation of the traditional third-party trusted organization coordination system and the counting of votes. Finally, the blind signature algorithm based on elliptic curve encryption is used to protect the privacy of voters. ©2021 IEEE.

关键词： Smart contract

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Offline parameter identification method considering the nonlinear characteristics of grid-connected inverter controller

Offline parameter identification method considering the nonl...

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12th International Conference on Renewable power Generation (RPG 2023)

作者： L. Zhang S. Li S. Xu Y. Li Q. Chen X. Jiang Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming People's Republic of China Kunming Power Supply Bureau Kunming People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou People's Republic of China State Key Laboratory of Alternative Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing People's Republic of China

ISBN: (数字)9781839539497

The correct model parameters play important role in fault characteristics analysis and protection design. It is a necessity to identify the parameters based on external characteristics due to the problem of parameters black-box. However, existing studies lack concerns in the nonlinear control of the control system during the transient, and cannot analysis the transient characteristics of the converter. Therefore, the inverter parameter identification method based on the dynamic model of phase-locked loop (PLL) is proposed in this paper. It is revealed that the influence of the dynamic process of PLL on the identification model. Considering the dynamic characteristics of PLL, a transient current identification model is established. A parameter identification method based on structural similarity (SSIM) was proposed. simulation examples show that the proposed parameter identification method can identify parameters accurately.

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Fault ride-through control of improved voltage drop method for MMC-HVdc connected renewable energy

Fault ride-through control of improved voltage drop method f...

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12th International Conference on Renewable power Generation (RPG 2023)

作者： L. Zhang S. Li S. Xu Y. Li Q. Chen X. Dong Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming People's Republic of China Kunming Power Supply Bureau Kunming People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou People's Republic of China State Key Laboratory of Alternative Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing People's Republic of China

ISBN: (数字)9781839539497

Renewable energy connected to the grid via MMC-HVdc should have fault ride-through (FRT) ability. However, it is difficult to achieve reliable FRT without high-speed and reliable communication between converters in the system. The coefficient of the traditional voltage drop method is qualitatively set as a linear constant, making it difficult to quickly reach the required voltage under different faults. As a result, there are long step delays due to the coordination of converters in the system, which consequently causes the dc system to operate at high voltage during FRT. To address this problem, this paper analyzes the dynamic characteristics of the dc system and the principles of the traditional voltage drop method. Based on this analysis, FRT control of improved voltage drop method for MMC-HVdc connected renewable energy is proposed. Finally, a simulation model is constructed in the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed method. Additionally, the proposed method is compared with the traditional method. The results demonstrate that the proposed method reduces the step delay and achieves accurate and reliable FRT.

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A non-unit adaptive traveling wave protection method for flexible dc transmission lines based on supplement of voltage data

A non-unit adaptive traveling wave protection method for fle...

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12th International Conference on Renewable power Generation (RPG 2023)

作者： L. Zhang S. Li S. Xu Y. Li Q. Chen K. Yao Institute of System Analysis and DC Transmission Technology Electric Power Research Institute of Yunnan Power Grid Co. Ltd Kunming People's Republic of China Kunming Power Supply Bureau Kunming People's Republic of China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou People's Republic of China State Key Laboratory of Alternative Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing People's Republic of China

ISBN: (数字)9781839539497

Traveling wave (TW) protection is crucial for ensuring the safety and stability of flexible dc transmission lines. Thereinto, shortening the sampling step is the key to improve the sensitivity of the derivative-based TW protection. However, higher sampling frequency is difficult to engineer and the protection performance will be constrained in case of the high resistance faults. To address this issue, a non-unit adaptive TW protection based on the supplement of voltage data has been proposed. Firstly, the voltage data is realized to complement utilizing the Lagrange's median theorem at the line boundary, which improves the sampling frequency. Then, it has been observed that the fault current variation is negatively correlated with transition resistance. Specially, the proposed protection takes this fully into account by incorporating the adaptive threshold that covers differences among various fault locations. Therefore, the proposed protection can effectively distinguish internal faults with high sensitivity. Finally, a two-terminal ±500kV MMC-HVdc (modular multilevel converter-high voltage direct current) system is built using PSCAD/EMTdc. The simulation results demonstrate that the line faults can be fast and correctly identified, even with 300 Ω fault impedance, in various fault scenarios.

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Testing of Ethernet Function of Domestically-made FPGA Chip and Acquisition Board for the Application of Protective Relaying

Testing of Ethernet Function of Domestically-made FPGA Chip ...

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2021 International Conference on power System technology, powerCON 2021

作者： Wang, Bin He, Xiaocai Jiang, Yingjie Lv, Xinquan Zhou, Zhimei Feng, Chen Dong, Xinzhou Tsinghua University Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electric Engineering Beijing China Communication Transmission Center Information Telecommunications Company State Grid Shandong Electeic Power Company Jinan China Chip Design Center Beijing Smartchip Microelectronics Technology CO. Ltd Beijing China Smart Shine Microelectronics Technology CO. Ltd Chip Product Department Beijing China

ISBN: (纸本)9781665407373

In order to solve the problem that the core chips of domestic protective relaying devices generally rely on foreign imported chips and realize the localized replacement of FPGAs, this paper designs the verification peripheral circuits of domestic FPGA chip through the analysis of the structure and test schemes design of domestic FPGA, including board-level verification scheme and data flow control verification scheme. The communication test and random test are carried out to the IP core of domestic FPGA MAC controller. From the test results, it can be seen that the loopback data and the transmitted data in the descriptor are consistent, and the tested domestic FPGA can be competent for its role in the application of protective relaying. © 2021 IEEE.

关键词： Field programmable gate arrays (FPGA)

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dc fault ride-through for wind power integration via MMC-HVdc based on precise control of energy storage configured inside wind farm

DC fault ride-through for wind power integration via MMC-HVD...

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Renewable power Generation and Future power Systems Conference 2023 (RPG 2023 UK)

作者： Y. Sun Y. Guo F. Fan J. Fan G. Li Z. Wang X. Wu Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education (Northeast Electric Power University) Jilin People's Republic of China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin People's Republic of China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow UK State Grid Smart Grid Research Institute Beijing People's Republic of China

The modular multilevel converter-based high voltage direct current (MMC-HVdc) overhead lines transmission scheme is the preferred option for wind power integration, though it is susceptible to dc faults. To ensure the connection of a wind farm (WF) to the grid during dc faults, this paper proposes a coordinated control strategy for dc fault ride-through (FRT) based on the energy storage system configured inside the WF for wind power integration through a bipolar MMC-HVdc. In the case of an instantaneous dc fault, the non-fault pole is regulated to operate at full power state to maximise wind power transmission. The exceedance of available wind power outputs over the transmission capacity of the non-fault pole is then accurately allocated to the internal energy storage units (ESUs) of wind generators (WGs) in order to ensure the power balance of the system and reduce the state of charge variance of ESUs as soon as possible. In order to reduce the energy capacities of ESUs required to store the excessive wind power in the event of a permanent dc fault, the method of step-by-step removing WGs is adopted to ensure the system power remaining balanced when the internal ESUs of the disconnected WGs are out of operation. The model is developed and carried out on the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed control strategies.

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dc-Side Synchronous Active power Control of Two-Stage Photovoltaic Generation for Frequency Support in Islanded Microgrids

SSRN

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SSRN 2022年

作者： Zhong, Cheng Zhou, Yang Chen, Jikai Liu, Zhanjie Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China State Grid Shandong Weihai Electric Power Co. Ltd Weihai China State Grid Energy Research Institute Co. Ltd Beijing102209 China

Virtual synchronous generator control (VSG) is an attractive method for the grid-tied inverter to provide inertia and frequency support. However, it brings some troubles on dc-link voltage control when it is applied to two-stage photovoltaic (PV) power generation. This study proposes a dc-Side synchronous active power Control for two-stage photovoltaic (PV) power generation without energy storage. Synchronous active power Control l is applied to dc-dc converters, while the grid-tied inverter still maintains the dc-link voltage constant. The dc-dc converters flexibly regulate active power to provide the simultaneous inertial and primary frequency response like a synchronous generator. A simple sensorless iterative maximum power estimation method is introduced and integrated into the dc-side VSG strategy. The maximum available power under variable irradiance conditions can be obtained. The effectiveness and advantages of the control strategy are validated through case studies on an island microgrid that included PV generations with a dc-bus collection system. © 2022, The Authors. All rights reserved.

关键词： power control

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