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

作者： Bin Wang Zhizhong Li Qi Guo Zhijiang Liu Shuyong Li Liu Cui Tsinghua University Beijing China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System State Key Laboratory of HVDC (Electric Power Research Institute China Southern Power Grid) Guangzhou China National Energy Power Grid Technology R&D Centre State Key Laboratory of HVDC (Electric Power Research Institute China Southern Power Grid) Guangzhou China China Southern Power Grid State Key Laboratory of HVDC (Electric Power Research Institute China Southern Power Grid) CSG Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

The commutation failures seriously threaten the safe operation of hybrid AC/dc grid. Considering that commutation failure occurs only on the inverter side, it is very important to study the voltage controlled current source model of LCC HVdc single terminal measurement information with high equivalent accuracy, which is very important for the practicality of real-time electromagnetic transient simulation of LCC HVdc dynamic phasor model. In order to this problem, this paper further discusses the single terminal equivalent model of LCC HVdc system which does not depend on the measurement information of dc sending end AC system, and explores the estimation method of single terminal fast transient response of complex AC/dc coupling faults induced by AC side fault of LCC HVdc inverter station and participation of dc control separation. The error distribution of single terminal equivalent calculation is quantitatively analyzed to lay a foundation for the follow-up protection and control technology research.

关键词： Analytical models Solid modeling Voltage measurement HVdc transmission Estimation Inverters Voltage control

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Research on Low-Frequency Offshore Wind Power Transmission and Frequency Conversion technology

Research on Low-Frequency Offshore Wind Power Transmission a...

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

作者： Jing Ge Hongyang Yu Guoliang Zhao Zhanfeng Deng Chaoliang Wang Power Electronics Research Institute State Key Laboratory of Advanced Transmission Technology(Global Energy Interconnection Researching Institute Co. Ltd. Beijing China Smart Grid Research Institute State Grid Zhejiang Electric Power CO. LTD. Research Institute Hangzhou China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

This paper introduces three offshore wind power transmission modes, which are power frequency AC, flexible dc and low-frequency AC. Secondly, the key technologies including parameter design and control strategy of large-capacity AC/AC frequency converter used in low-frequency transmission system are studied. Then, it is verified by system modelling and simulation that one 400 MW offshore wind power transmitted by low-frequency has technical feasibility, and the correctness of parameter design and control strategy is also tested. Finally, it is summarized that within a certain transmission distance, low-frequency transmission mode has better technical and economic performance, and it could be one beneficial alternate mothed of offshore wind power grid-connected to the power frequency mode and flexible dc transmission mode.

关键词： Economics System integration Wind power generation Frequency conversion Internet Frequency control Optimization

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Unreasonable reactive power flow of traditional SVC and a novel SVC model against it

Unreasonable reactive power flow of traditional SVC and a no...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Ge, Huaichang Chen, Tianhua Chen, Hao Ding, Haoyin Guo, Qinglai Wang, Bin Xu, Fengda State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University Beijing100084 China NARI Group Corporation State Grid Electric Power Research Institute Nanjing211106 China NARI Technology Co. Ltd. Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China East China Grid Corporation No. 882 Pudong South Road Shanghai200120 China

ISBN: (纸本)9781728135205

Recent years, various types of reactive power resources are installed in the power grid. Both of the complexity of and demand for better voltage regulation are increasing. AVC system is the most famous system-wide Q/V control system which consists of PVC, SVC and TVC. SVC controls the voltages of buses within a control zone by sending individual set-point values to PVCs belonging to the control zone. Traditional SVC assumes that PVCs within a control zone is decoupled and each PVC can reach the set-point value during a control period. However, the proof in this paper reveals the fact that if there are strongly coupled PVCs in a control zone, the competition between those PVCs will cause unreasonable reactive power flow. PVCs can't reach their set-points so a deviation of Q output is induced. In this paper, a novel SVC model is proposed so as to eliminate the Q deviation. simulation work verified the proof and demonstrated the effectiveness of the proposed SVC model. © 2019 IEEE.

关键词： Electric load flow

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A Corrective Control Approach For Combined Heat And Power System integrated with Multiple Energy Storage System

A Corrective Control Approach For Combined Heat And Power Sy...

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2019 IEEE PES Innovative smart grid Technologies Asia, ISGT 2019

作者： Lin, Qunli Shen, Xinwei Sun, Yong Li, Zhenyuan Guo, Qinglai Sun, Hongbin Shenzhen Environmental Science and New Energy Technology Engineering Laboratory Tsinghua-Berkeley Shenzhen Insitute Tsinghua University Shenzhen China State Grid Corp. of China Jilin Power Grid Company Jilin China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China

ISBN: (纸本)9781728135205

The integrated Energy System (IES) becomes very important nowadays, however, the coupling between multiple energy systems will bring new challenges to the security control of the IES, such as combined heat and power (CHP) system. The corrective control means that the operations can be adjusted after contingency happens to eliminate the constraints violation in the contingency state such as the transmission outage or generator outage. This paper proposes a corrective control approach for CHP system integrated with the energy storage system based on security constrained economic dispatch (SCED) model. Case studies based on the IEEE 9-bus CHP system are presented to verify the method. The case result shows that the energy storage device can solve the ramping of the unit's output adjustment well. The corrective control method is more scientific and economical. © 2019 IEEE.

关键词： Outages

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Research on the secure transmission method of terminal upgrade files based on dynamic encryption key 3

Research on the secure transmission method of terminal upgra...

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3rd IEEE International Conference on Electronic Information technology and Computer Engineering, EITCE 2019

作者： Fu, Yilun Zhai, Feng Cen, Wei Zhang, Yanjie Li, Baofeng China Electric Power Research Institute Beijng China Beijing Smart-Chip Microelectronics Technology Co. Ltd. State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijng China

ISBN: (纸本)9781728135847

In order to improve the secure transmission capability of terminal upgrade files, we proposed a secure transmission method of terminal upgrade files based on dynamic encryption key. This method realized the access control of terminal upgrade file by using no proxy key publishing protocol, designed the dynamically symmetric key for the terminal upgrade file. The encoding calculation of terminal upgrade files in the process of secure encryption is carried out based on bilinear mapping method. We scrambled and rearranged the terminal upgrade files according to the intensity of plaintext attack, then adopted the random linear coding method to encrypt the terminal upgrade files by dynamic symmetric key and realize the secure transmission for the files. simulation results show that this method can effectively improve the security transfer performance of upgrade files, and can meet the requirements of current business applications. © 2019 IEEE.

关键词： Access control

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A Synchronization Algorithm for Burst-Mode MR-OFDM System of 802.15.4g

A Synchronization Algorithm for Burst-Mode MR-OFDM System of...

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2019 International Conference on Artificial Intelligence Technologies and Applications, ICAITA 2019

作者： Zhao, Yahong Zhao, Xu Zhang, Yubing Tang, Xiaoke Dong, Mingke State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Design and Analysis Technology Co. Ltd Beijing100192 China School of Electronics Engineering and Computer Science Peking University Beijing100871 China

This paper presents a refined coarse frame synchronization algorithm for long repeated-sequence based preamble STF (short training field) in burst mode MR-OFDM system of 802.15.4g which is of low decision delay and resistant to timing uncertainty due to metric plateau. The precision of coarse timing and frequency offset estimation is improved. A fine symbol timing and frequency offset estimation algorithm based on LTF (long training field) is also proposed which provides an overall solution for the synchronization of burst mode MR-OFDM system. simulation results are given to provide reference for implementation. © 2019 IOP Publishing Ltd. All rights reserved.

关键词： Synchronization

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A Generic TC-Based Method to Find the Weakness in Different Phases of Masking Schemes

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Tsinghua Science and technology 2018年第5期23卷 574-585页

作者： Ming Tang Yuguang Li Yanbin Li Pengbo Wang Dongyan Zhao Weigao Chen Huanguo Zhang School of Cyber Science and Engineering Wuhan University Wuhan 430072 China State Key Laboratory of Cryptology Beijing 100878 China State Grid Key Laboratory of PICD & AT Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing 100080 China State Grid Xinjiang Electric Power Corporation Maintenance Company Urumqi 830002 China

Masking is one of the most commonly used Side-Channel Attack （SCA） countermeasures and is built on a security framework, such as the ISW framework, and ensures theoretical security through secret sharing. Unfortunately, the theoretical security cannot guarantee practical security, because several possible weaknesses may exist in the actual implementation. These weaknesses likely come from the masking schemes or are introduced by the implementation methods. Finding the possible weakness of the masking scheme is an interesting and important issue for real applications. In this paper, the possible weaknesses for masking schemes in Field- Programmable Gate Array （FPGA） design are discussed. It was found that the combinational circuit is the key to the security of masking schemes. The Toggle Count （TC） method and its extension are utilized to evaluate the security of masking schemes in the design phase and the implementation phase separately. Comparing different logic-level simulators for the Xilinx FPGA platform, the behavioral and post-translate simulations are considered as the analysis method in the design phase, while the post-map and the post-route simulations are used to find the weakness during the implementation phase. Moreover, a Standard Delay Format （SDF） based improvement scheme is proposed to significantly increase the effectiveness of the TC model.

关键词： Side-Channel Attack （SCA） toggle count masking simulation-based analysis

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A novel method based on dynamic extinction angle of thyristor to mitigate commutation failure for HVdc

A novel method based on dynamic extinction angle of thyristo...

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The 16th IET International Conference on AC and dc Power Transmission (ACdc 2020)

作者： L. Kou Z. Mi X. Huang State Key Laboratory of Advanced Transmission Technology (Global Energy Interconnection Research Institute Ltd.) Changping District Beijing China Beijing Key Laboratory of DC Grid Technology and Simulation (Global Energy Interconnection Research Institute Ltd) Changping District Beijing China School of Electrical and Electronic Engineering North China Electric Power University Changping District Beijing China

Commutation failure is one of the critical problems for the HVdc transmission system. According to the theoretical analysis, the characteristics of the dynamic minimum extinction angle of the thyristor can be obtained. Considering the effect of the system operation conditions on the minimum extinction angle of the thyristor, a dynamic compensation method is proposed , which aims to mitigate the commutation failure of the HVdc transmission system. A simulation model based on CIGRE HVdc standard test system is built in PSCAD/EMTdc. The control performance of the proposed compensation method is verified by carrying out simulations under different fault scenarios. simulation results prove that the proposed compensation method, to some extent, has the ability to mitigate the consequential commutation failure under single-phase fault and three-phase fault. Therefore, the fault recovery characteristics and the reliability of HVdc transmission system can be effectively improved.

关键词： HVdc power transmission power transmission control HVdc power convertors power transmission faults commutation

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The Influence of ISI and an Improved Algorithm of Channel Estimation in the Chirp System

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Journal of Physics: Conference Series 2021年第1期1738卷

作者： Nan Zhao Dongyan Zhao Yubo Wang Xiaoke Tang Xu Zhao Yubing Zhang Jiadi Liu State Grid Key Laboratory of Power Industrial Chip Design and Analysis Technology Beijing Smart-Chip Microelectronics Technology Co. Ltd. Beijing 100086 China

Chirp signal is widely used in communication, radar, sonar and ultrasonic systems. The impulse response of channel must be estimated in PSK chirp spread spectrum modulation systems which is a chirp signal multiplied by the PSK modulated signal. Due to the influence of filters and multipath channel, the received signal of current symbol will be affected by the interference of the previous symbol and the next symbol, the interference which is called inter-symbol interference (ISI) can degrade the performance of channel estimation and demodulation. In this paper, based on BPSK chirp spread spectrum modulation system, we describe the received model, the channel estimation based on FFT and channel estimation of matched filtering, analyze the impacts of ISI on channel estimation. And we simulate the MSE of channel estimation and the simulation results are consistent with the analysis, then an improved method of channel estimation is proposed based on the analysis of the impact of ISI on channel estimation.

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Investigation on Insulating Properties of Epoxy Resin Impregnated Paper Affected by Curing Agents and Accelerator Contents

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IEEE Transactions on Dielectrics and Electrical Insulation 2025年

作者： Teng, Chenyuan Ding, Yichao Zhou, Yuanxiang Zhao, Lei Zhang, Yunxiao Chen, Haoran Zhang, Youbing Zhejiang University of Technology College of Information Engineering Hangzhou310023 China Nankai University China and College of Electronic Information and Optical Engineering Tianjin300350 China Zhejiang Testing & Inspection Institute for Mechanical and Electrical Products Quality Co. Ltd Hangzhou310051 China Tsinghua University State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Beijing100084 China State Grid Xinxiang Electric Power Supply Company Xinxiang453002 China

The curing formula is vital to the performance of epoxy resin impregnated paper (RIP) material. This work explored the effect of curing agents and accelerator contents on the thermal and electrical properties of RIP material. It was found that the RIP material cured with 1phr accelerator has the optimal glass transition temperature, electrical conductivity, dielectric loss and dc breakdown strength compared with RIP material cured by 0.5phr, 2phr, and 3phr accelerator. The RIP material cured with MEHHPA has better thermal and insulating properties compared with the RIP material cured with METHPA. The existence of the crepe paper amplifies the influence of accelerator and curing agent for the hydroxyl groups affect the curing process as well as the chain segment arrangement. This study provides the research support for the design of the curing formula for RIP insulation used in dc bushing. © 1994-2012 IEEE.

关键词： Dielectric losses

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