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A New Differential protection Scheme of Distribution Network Line Based on Improved DTW Algorithm and 5G Communication 1

引用

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

作者： Pu, Hongfei Wu, Tonghua Yao, Gang Hong, Feng Zheng, Xiaojiang Wang, Weiwei Li, Xindong State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China NARI Group Corporation Jiangsu Nanjing211106 China

ISBN: (数字)9789811671562

ISBN: (纸本)9789811671555

With the massive access of new energy, the differential protection will replace the traditional single-ended protection as the main protection of the distribution network line. Among the current differential protection channels, only 5G communication technology has both advantages of performance and price. However, using 5G communication as a communication channel needs to overcome the problems of delay jitter and data packet loss. This article first analyzes the principle of differential protection based on dynamic time warping (DTW) distance algorithm, and uses the nearest previous normal sampling point to replace the current abnormal one to deal with the problem of data packet loss, which is called alternative processing method. Secondly, the main starting criterion based on DTW distance of two-phase current and the auxiliary starting criterion based on DTW distance of the triple zero-sequence current are proposed. Thirdly, the calculation method of DTW algorithm under the short data window is proposed and the two operating criteria based on DTW algorithm are improved. And then, these 4 criteria are combined as a differential protection scheme for distribution network. Both theoretical calculation and simulation analysis show that the proposed scheme can operate well under different types of faults in different locations. With 5G communication delay being ignored, the scheme can operate in only 4–7 ms, and the data window of main operating criterion is only 3.75 ms. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： 5G mobile communication systems

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Electric vehicle identification and demand response capability assessment based on non-intrusive monitoring 5

Electric vehicle identification and demand response capabili...

引用

5th IEEE International Electrical and Energy Conference, CIEEC 2022

作者： Deng, Jiewen Wang, Jiarui Liu, Yu Wang, Yi Nanjing China Southeast University School of Electrical Engineering Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (数字)9781665411042

ISBN: (纸本)9781665411042

The current rapid development and large number of applications of electric vehicles make it necessary to further strengthen the research on the state sensing and demand responsiveness of electric vehicles for residential measurements. Based on the non-intrusive load monitoring technology and deep learning algorithm, the user's power data is processed to obtain the start and end time of possible EV charging behavior, and then the user's power magnitude data and the obtained possible charging start and end time data are used as the input data of BP neural network to identify the EV charging behavior and establish the load sensing model of residential EVs. Based on the load perception model of electric vehicles, we identify the electric load data of residential measurement, obtain the charging status information such as power and electricity of electric vehicles of users, and use the status information as the data base to evaluate the demand response capability of residential measurement electric vehicles. Finally, the simulation modeling of the above method shows that the method can identify the charging status of electric vehicles more accurately and effectively evaluate the ability of residential measurement electric vehicles to participate in demand response. © 2022 IEEE.

关键词： Electric vehicles

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Analysis of the Status and the Prospects of Pilot protection in Distribution Network Based on 5G Communication 1

引用

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

ISBN: (数字)9789811671562

ISBN: (纸本)9789811671555

With the massive access of new energy resources, distribution network urgently needs to popularize the principle of pilot protection. As a suitable data transmission channel at present, 5G communication technology still has the problem of time delay and its jitter, which also directly affects the data synchronization method of pilot protection. On the basis of analyzing the composition of 5G time delay and reasons for its jitter, this paper first summarizes the current methods to alleviate this problem and proposes a new solution to deal with it, namely regional ad hoc network technology based on 5G CPEs. Secondly, after elaborating the advantages and disadvantages of data synchronization and self-synchronization technology based on 5G communication, in order to cooperate with regional ad hoc network technology based on 5G CPEs, the improved ping-pong time synchronization method is proposed. Thirdly, the principle of pilot protection based on waveform similarity is explained in detail, which has good performance of anti-synchronization error and anti-data packet loss. And then, the data transmission security and 5G data traffic problem are analyzed. Finally, the overall communication strategy of the regional distribution network based on 5G communication is proposed, and several suggestions for the development of the pilot protection of distribution network based on 5G are proposed. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Time delay

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Frequency Regulation Market Performance Considering the Complementarity of Wind Park Cluster 6

Frequency Regulation Market Performance Considering the Comp...

引用

6th IEEE Conference on Energy Internet and Energy System Integration, EI2 2022

作者： Huang, Zirui Zhang, Jiangfeng Teng, Xianliang Zhang, Kaifeng Southeast University School of Automation Nanjing China State Grid Zhejiang Electric Power Research Institute Zhejiang China State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9798350347159

Modern power systems with high penetration of renewable energy enrich the frequency regulation resources by offering more new clean wind and solar energy. In this paper, we present a bottom-top design of wind park's participation in the frequency regulation market considering the complementarity of wind park power outputs. By defining a quantitative complementarity index, we show how the complementarity contributes to the regulation reserve reliability of wind parks and the consistent market performance, and verify the conclusions via numerical analysis. © 2022 IEEE.

关键词： Wind power

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A new approach for calculating the average frequency of power system based on the identification of regional inertia center nodes 2

A new approach for calculating the average frequency of powe...

引用

2nd International Conference on Electrical Engineering and Computer Technology, ICEECT 2022

作者： Wan, Zhonghui Liu, Fusuo Wu, Xuelian State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing210003 China NARI Group Corporation/State Grid Electric Power Research Institute Jiangsu Nanjing210003 China

The grid structure of the modern power system is complex and the space span is large. When the power system is disturbed to generate unbalanced power, the transient distribution process among the various synchronous units leads to the spatiotemporal distribution characteristics of the frequency response of the system. By measuring the generator Frequency and Inertia, the inertia center frequency can be calculated. Based on the two-generator system, the relationship between generator frequency and bus frequency is analyzed. A method for selecting the frequency inertia center node of the local power grid in the power system is proposed, and the inertia center frequency of the system is estimated based on the measured frequency at this point. Taking 10 machines and 39 nodes as an example, the simulation calculation is carried out to verify the effectiveness of the proposed method. © Published under licence by IOP Publishing Ltd.

关键词： Frequency response

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Transient Stability Analysis of Paralleled grid-Forming Converters 3

Transient Stability Analysis of Paralleled Grid-Forming Conv...

引用

3rd International Conference on Energy, Power and Electrical Engineering, EPEE 2023

作者： Yang, Kexin Bao, Yanhong Wu, Feng Ren, Xiancheng Zhang, Jinlong Nanjing Normal University Nari Technology Co. Ltd. Nanjing China Nari Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China

ISBN: (纸本)9798350318180

Interaction exists in multiple grid-forming converter parallel systems, resulting in different transient stability issues between multiple converter systems and single converter under large disturbances. During the current limiting period, the external characteristics of the grid-forming converter become current source, which causes three different external characteristic models of parallel converter. In this study, three models of parallel system were established, and the effect of different coupling power directions was analyzed based on the power angle curve. Further, the influence of different parameters of converter was discussed and three different cases of converter transient stability due to interaction was revealed. The interaction between converters is mainly determined by the coupling power direction. When the external characteristics of the converters are the same, the coupling power direction is mainly determined by the power angle. When the external characteristics are different, the coupling power direction is determined by the current limiting strategy. The correctness of the theoretical analysis was verified based on the PSCAD platform. © 2023 IEEE.

关键词： current limiting equal area criterion grid-forming converter paralleled system transient stability

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Research on Control Strategy and Simulation of MMC-HVDC System Based on Battery Energy Storage System

Research on Control Strategy and Simulation of MMC-HVDC Syst...

引用

Electrical Engineering and Control Science (IC2ECS), International Conference on

作者： Liyu Dai Chaoping Deng Wujie Chao Jinke Wang Junwei Huang Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou China

This paper presents a method of applying MMC based on battery energy storage system (BESS) to HVDC system to realize power decoupling control on AC and DC side. Firstly, the basic structure and working principle of MMC-HVDC system based on BESS are analyzed. Then, based on the mathematical equivalent model, the MMC-BESS decoupling control method based on DC power control is derived, and the AC-DC power decoupling control is realized. Finally, a +400kV MMC-HVDC system is built on the RTDS platform, and the proposed control strategy and power decoupling effect are verified. The results show that the MMC-BESS control strategy proposed in this paper is effective. The MMC-HVDC system based on BESS can realize active power decoupling control between AC side and DC side, and the unbalanced power between AC side and DC side can be compensated by the charge and discharge of BESS.

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Parallel Decomposition and Coordination Algorithm for Security Constrained Optimal Power Flow 1

引用

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

作者： Xiaoqin, Xia Wei, Xu Zhen, Yuan Xiaotong, Xu NARI Group Corporation/State Grid Electric Power Research Institute Jiangsu Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China

ISBN: (数字)9789811671562

ISBN: (纸本)9789811671555

In order to improve the online performance of power system control decision-making, this paper proposes a method to resolve the economic optimization problem considering security constraints into a base-case optimal power flow master problem with the objective of minimizing the generation cost and a series of security check sub problems relevant to various faults. A parallel decomposition and coordination algorithm based on adjustable space slices is proposed to avoid alternating iterations. First of all, the adjustable space is sliced to form multiple slicing schemes according to different proportions. Based on the parallel computing platform and the slicing schemes, the primal dual interior point method is used to solve the base-case optimal power flow master problem. Secondly, security check of faults is carried out by parallel computing for different optimized cases. Then, the solution with the minimum cost is chosen from the safe solutions. Finally, the effectiveness of the proposed method is verified by a case of a city power gird in Guizhou province. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Decision making

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Influence Analysis of Control Parameters on Transient Stability of Single-loop Voltage-Magnitude Controlled grid-Forming Converter 6

Influence Analysis of Control Parameters on Transient Stabil...

引用

6th Asia Conference on Energy and Electrical Engineering, ACEEE 2023

作者： Yang, Kexin Bao, Yanhong Ren, Xiancheng Wu, Feng Zhang, Jinlong Nanjing Normal University NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Technology Co. Ltd. Nanjing China

ISBN: (纸本)9798350312690

With the gradual increase in the proportion of new energy generation, grid-forming control with dynamic regulation and support capability of frequency and voltage has become a research hotspot. However, the current-limiting control of the converter reduces the transient stability margin and leads to the complex evolution of the transient instability mode, which poses a great challenge to the stable operation of new energy units. In this paper, the influence of different current limiting strategies on the transient stability of the single-loop voltage-magnitude controlled grid-forming converter is analyzed, and three typical instability evolution modes are summarized. Further, the influence law of virtual inertia and damping parameters on the transient stability is analyzed by critical clearing angle (CCA), and critical clearing time (CCT), the mechanism of abnormal phenomena of virtual inertia and damping parameters on transient stability is revealed based on the equal area criterion, and the conditions for abnormal phenomena are clarified, finally, the transient instability evolution modes and the mechanism of abnormal phenomena is verified by electromagnetic transient time domain simulation. © 2023 IEEE.

关键词： Stability

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Empirical Study of the Influence of AC/DC Touch Fault on Transformer Differential protection 1

引用

International Top-Level Forum on Engineering Science and Technology Development Strategy and 5th PURPLE MOUNTAIN FORUM on smart grid protection and Control, PMF2020

作者： Gu, Qiaogen Lv, Hang Zhang, Xiaoyu Cheng, Lulu Cheng, Xiao State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (数字)9789811597466

ISBN: (纸本)9789811597459

In practical engineering, the cross and crossing of AC and DC lines are more common at present. The communication lines are complex, especially in the South. With many DC projects, the cross over phenomenon of AC and DC in the China Southern Power grid is more obvious. This paper is based on the practical PSCAD simulation model of Jin-Zhong converter station, built a simulation model of AC and DC concomitant systems, and selecte 220 kV and 500 kV communication systems as typical scenarios for analysis by simulation of metal touch faults outside the AC transformer protection range. According to the simulation waveform, The characteristic analysis results of transformer differential protection are given in the end. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Transformer protection

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