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Analysis on the Influence of the DC bias on spatial magnetic flux leakage in the transformer

Analysis on the Influence of the DC bias on spatial magnetic...

引用

2022 IEEE International Conference on High Voltage Engineering and Applications, ICHVE 2022

作者： Zheng, Yuping Pan, Shuyan Xia, Yu Ouyang, Xi Shang, Hujun Zhou, Quan Nari Group Corporation Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China School of Electrical Engineering Chongqing University Chongqing China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

Magnetic flux leakage, as a basic physical parameter in power transformer, can be utilized to characterize the status of the winding. And the DC biasing, as a common abnormal operation condition, is caused by solar storms, DC power transmission and some railway power transmission. It can induce the current bias and the core saturation, further changing the distribution of the magnetic flux leakage. Therefore, it is significant and valuable to analyze the effect of DC biasing on spatial magnetic leakage flux. In the paper, we design a transformer finite element model with its physical fieldcircuit simulation module. The model with some detailed winding structure can obtain the accurate magnetic field signal. Then the effect of different degrees DC biasing on the magnetic leakage flux is analyzed in the inner key positions. And the 10kV shrunken experimental transformer imitating the 110 k V transformer is selected as the research object. Depending on the experimental platform, we obtain the actual magnetic field signals and explore the incidence relation between the magnetic leakage flux and the DC biasing. © 2022 IEEE.

关键词： Power transmission

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Typical Influence of Wind Power Capacity Expansion on the Transient Angle Stability and Feasible Explanations

Typical Influence of Wind Power Capacity Expansion on the Tr...

引用

Sustainable Power and Energy Conference (iSPEC)

作者： Tiangang Huang State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

The high proportion of renewable energy into the power grid, say, the large-scale wind power generation connected to the power grid, is the key approach to achieve the clean and low-carbon energy transition. Under the premise of ensuring power grid's safe and stable operation, it is necessary to study the influence of wind power capacity expansion on the transient angle stability (TAS). Aiming at several typical dominant modes in Qinghai power system, which holds many new energy resources, the sensitivity of wind power capacity expansion in different locations to the TAS, as well as its key influence factors and feasible explanations, are explored. It may lay the foundation of the location optimization of wind power capacity expansion.

关键词： Stability criteria Wind power generation Power system stability Power grids Transient analysis Thermal stability Optimization

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Research on the differential protection of the SFC output transformer for pumped storage hydro unit

Research on the differential protection of the SFC output tr...

引用

2021 International Conference on Information Technology and Intelligent control, CITIC 2021

作者： Long, Feng Wan, Luofei Pan, Shuyan Liu, Xiaobao Wang, Zhonglang Zhao, Ruichen State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing China NARI Technology Co. Ltd. Jiangsu Nanjing211106 China

Pumped storage power stations play an great role in promoting new energy consumption, ensuring the safety of power grid, building clean, low-carbon, safe and efficient energy system, and has a broad development prospect. SFC is the most important start-up mode of pumped storage unit, and the output transformer is an important equipment of SFC system, which needs to be equipped with reliable and fast differential protection to ensure its safe and reliable operation. The current frequency varies from 0 to 50Hz during SFC start-up, so the conventional transformer differential protection can not adapt. In this paper, the output transformer differential protection technology is studied according to the electrical characteristics and short circuit fault characteristics of SFC start-up process, the high precision frequency algorithm and the RMS integration algorithm with compensation are proposed to realize the precise measurement of frequency and amplitude, and the ultra-low frequency CT saturation identification technology is proposed to realize the whole process protection of the output transformer from start-up to grid-connection. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Energy utilization

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A Coupled RTK/INS Positioning Method Based on Robust Estimation 14th

A Coupled RTK/INS Positioning Method Based on Robust Estimat...

引用

14th China Satellite Navigation Conference, CSNC 2024

作者： Yu, Huizhen Teng, Xianliang Pan, Shuguo Zhang, Min Shen, Jian Gao, Wang School of Instrument Science and Engineering Southeast University Nanjing210096 China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing211106 China

ISBN: (纸本)9789819969319

In the urban environment, the positioning results of RTK/INS integrated navigation are often influenced by grosses, which degrades the positioning accuracy and damages the stability of the navigation system. To solve this dilemma, a loose coupled RTK/INS positioning method based on robust estimation is proposed. Firstly, during RTK positioning, for eliminating corrupted measurements caused by Non-Line-of-Sight (NLOS) signals and multipath, this paper researches the RTK positioning algorithm based on bifactor robust estimation. In this method, the ambiguity is fixed and solved back into the Double-Difference (DD) equation in least square model. The posterior residual vector is used for the bifactor robust processing to eliminate the influence of some abnormal observations. Then, the RTK positioning results are loosely integrated with Inertial Navigation system (INS), and the robust processing based on Huber equivalent weight function is implemented in the process of the Kalman filter update. Finally, the proposed algorithm is validated by vehicle data in a typical urban environment. The experimental results show that compared with the traditional least squares-based RTK, the accuracy of the bifactor RTK method is improved by 2.48 cm in the horizontal direction. Meanwhile, in contrast with the RTK/INS method based on the single robust processing, the accuracy of the proposed robust bifactor error method in the horizontal direction is increased by 3.85 cm. The navigation accuracy and reliability are significantly enhanced. In dynamic environment, this research has certain theoretical reference and practical value for vehicular and autonomous driving applications. © Aerospace Information Research Institute 2024.

关键词： Kalman filters

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Dynamic Test for DC Training Emulation system with Back-to-back MMC

Dynamic Test for DC Training Emulation System with Back-to-b...

引用

2019 IEEE Sustainable Power and Energy Conference, iSPEC 2019

作者： Yang, Zaixin Xing, Lixin Yin, Baiqing Wang, Yunmin Wang, Yuqiang Gao, Chen Inner Mongolia Electric Power Science and Research Institute Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Institute of Relay Protection Hohhot China

ISBN: (纸本)9781728149301

With the development of VSC-HVDC and engineering applications, establishing a modular multilevel converter (MMC) platform is extremely important for simulation research and training. In this study, a back-to-back MMC emulation system with a converter station level is developed. Dynamic tests are performed to verify the stability performance and the dynamic performance of the respective physical devices under asynchronous interconnection conditions. The results show that the system can perform automatic control for the sequence of blocking, uncontrolled charging, controlled charging, and unlocking operations. A remarkable power quality effect is obtained by using a controller for circulating current suppressing (CCS). Using a visual station operation interface, the dynamic index of the power step test is found to conform to the test standard, and the system exhibits stable operation. © 2019 IEEE.

关键词： Simulation platform

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Analysis of influence of virtual inertia of grid-forming converter on transient stability characteristics 5

Analysis of influence of virtual inertia of grid-forming con...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Huang, Xifang Zhu, Ling Li, Wei Li, Mingfei Quan, Xiangiun Wu, Zaijun Research Institute NARI/SGEPRI State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation/State Grid Electric Power Nanjing China Southeast University Seu School of Electrical Engineering Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Due to its different characteristics from traditional synchronous generator, grid-forming converter (GFM-converter) affects the transient characteristics of the system when it is linked to the power grid. The mathematical model of the GFM-converter is built to describe its dynamic characteristics. Then, the transient process of the GFM-converter is analyzed qualitatively with the power-angle curve. The phase diagram method is used to study quantitatively and verify the validity of the above qualitative analysis. Finally, the influence of virtual inertia JGFM on the transient response is analyzed. In the case that equilibrium point exists after fault, decreasing virtual inertia improves the transient stability of the GFM-converter by increasing the damping ratio. When the equilibrium point does not exist after fault, the increase of JGFM reduces the virtual power angle at the time of fault clearing, and the power imbalance degree of the GFM-converter is reduced, thus its transient stability performance is improved. © 2022 IEEE.

关键词： Phase diagrams

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Reliability assessment of power systems with wind farms considering correlations 4

Reliability assessment of power systems with wind farms cons...

引用

4th International Conference on Advanced Electronic Materials, Computers and Software Engineering, AEMCSE 2021

作者： Wu, Yuwei Wu, Hai Hu, Guo Zhihua, Xu Qi, Huang NARI Technology Development Co. Ltd. Nanjing211106 China Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China

ISBN: (纸本)9781665415965

Wind power has the characteristics of randomness and intermittent, with the increasing unit capacity of wind turbines and wind farm scale, it is urgent to study the impact on generation and transmission system reliability. In addition, there are different degrees of correlation among regional multiple wind farms because of their geographic proximity. When it comes to research on the influence on the power system reliability, the analysis result will be larger error without considering the correlation, which is optimistic for reliability assessment. Therefore, it is meaningful to take the correlation into account in wind power system reliability assessment. In this paper, IEEE-RTS 79 generation and transmission reliability test system is adopted to verify the reliability assessment of power systems with wind farms considering correlations. The experimental results show that adding wind turbines in the original power system, system reliability has been greatly improved;and the system has higher reliability with given the considering the correlation between wind farms. © 2021 IEEE.

关键词： Wind farm

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Operation optimization of section III of distance protection based on DC information 5

Operation optimization of section III of distance protection...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Zhang, Haiyu Li, Wei He, Jinghan Beijing Jiaotong University School of Electrical Engineering Beijing China State Key Laboratory of Smart Grid Protection and Control Skl of Sgpc Nanjing China Nari Group Corporation Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

Failure of the DC system itself to withdraw from operation or failure of the AC system causing blocking of the DC system may result in a tidal shift to overload the AC line. Unreasonable tripping of the AC line's distance III backup protection based on local information drives the development of chain tripping incidents and can lead to significant outages. For this reason, a method based on conservation and control synergy is proposed, using DC control information to optimise AC distance III backup protection action behaviour. When the tidal shift triggered by the DC phase change failure blocking makes the distance protection section III act unreasonably, the DC control information is used as the activation condition for the backup protection action range adjustment to improve reliability and prevent the backup protection from acting unreasonably. Finally, the effectiveness of the above strategy is verified by PSCAD software simulation. © 2022 IEEE.

关键词： Outages

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A Method for Locating Ground Faults in Distribution Network Based on Change of Longitudinal Current

A Method for Locating Ground Faults in Distribution Network ...

引用

2021 International Conference on control Science and Electric Power systems, CSEPS 2021

作者： Lei, Xia Hai, Wu Guo, Hu Song, Hu State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing211106 China NARI Technology Development Co. Ltd. Jiangsu Nanjing211106 China

ISBN: (纸本)9781665426183

A new method for locating ground faults in distribution network was introduced by analysis of the characteristics of the ground fault for the isolated neutral system. The method by comparing the longitudinal current change of the adjacent measurement point to judge the ground fault location, and has verify it by building the simulation model on the PSCAD/EMTDC. The results show that the method has a strong ability of resistance to transition resistance. The specific implementation scheme was given based on the fault indicator which is widely used in distribution network at present. © 2021 IEEE.

关键词： Location

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Research on key Technologies of Line Differential protection Based on 5G Communication 6th

Research on Key Technologies of Line Differential Protection...

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6th PURPLE MOUNTAIN FORUM on smart grid protection and control, PMF2021

作者： Zheng, Xiaojiang Yao, Gang Wu, Tonghua Teng, Xianliang Hong, Feng Wang, Weiwei State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China Jiangsu Nanjing211106 China NARI Technology Co. Ltd Jiangsu Nanjing211106 China

ISBN: (纸本)9789811671555

With the advanced 5G communication technology and the wireless communication environment of 5G communication network with high bandwidth, low delay and high reliability, line differential protection based on 5G communication has become the development trend of MV (Medium Voltage) and LV (Low Voltage) distribution network protection. This paper provides an overall architecture scheme of line differential protection based on 5G communication to further explain the characteristics of 5G network, and aiming at the problem of delay jitter existing in 5G network, presents a sampling point sequence number synchronization method based on absolute time-marker of external clock to analyze data encapsulation, interaction and traffic consumption of bilateral differential protection, and the corresponding technical solutions, and at last, it proposes a processing mechanism of protection device in dealing with clock loss and data anomaly, which provides a complete technical route for line differential protection based on 5G communication, facilitates the large-scale application of longitudinal differential protection in the closed-loop operation of MV and LV power network, and ensures that the requirements of quickness and selectivity can be met in the traditional non-unit protection of MV and LV power network, so as to improve the reliability level of power network. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： 5G mobile communication systems

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