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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Hu, Yunlong Wang, Qi Ni, Ming Yang, Yi Zhu, Yongkang Yao, Xiecheng Nanjing Normal University College of Electrical and Automation Engineering Nanjing China Nari Group Corporation State Key Lab of Smart Grid Protection and Control Nanjing China State Grid Jiangsu Electric Power Research Institute Nanjing China

ISBN: (纸本)9781665414395

Combined heat and power state estimation is the basis for safety assessment, optimal dispatching and other functions in multi-flow energy management centers, and has important theoretical value and practical significance. The measurement system inevitably has gross errors or bad data. The traditional weighted least squares method can't restrain its influence, so the robust estimation method of combined heat and power network based on Huber estimation is proposed. The results of calculation examples show that the proposed method has good robustness and can restrain the influence of gross errors on the estimation accuracy. © 2021 IEEE.

关键词： Electric power transmission networks

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Leakage flux-based method to identify the inrush current in transformers 12

Leakage flux-based method to identify the inrush current in ...

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12th International Conference on Measuring Technology and Mechatronics Automation, ICMTMA 2020

作者： Zheng, Yu-Ping Zhang, Zhen-Ya Wu, Chong-Hao Pan, Shu-Yan Li, Zhou NARI Technology Co. Ltd State Key Laboratory of Smart Grid Protection and Control Nanjing211106 China

ISBN: (纸本)9781728170817

Inrush current occurrence in the power transformers is an unavoidable event that can happen due to energizing no-load transformer. Although various protection methods based on the terminal current and/or voltage have been proposed for transformer protection, the protection malfunction caused by the inrush current still occurs occasionally. In this paper, By comparing different closing angles of transformers with normal condition and differences in leakage flux near the yoke, a simple and accurate method is presented to identify transformer inrush current conditions. The change of the flux density on the leakage flux sensor can effectively identify the transformer inrush current. This identification method has been initially verified in the simulation in Maxwell. © 2020 IEEE.

关键词： Power transformers

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Subsynchronous Oscillation Data Generation Method of Power System Based on Bidirectional Long Shortterm Memory Generative Adversarial Network

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smart Power 2024年第5期52卷 60-66页

作者： Xue, Zhanhao Chen, Li Lin, Zhiying Zhang, Min Xu, Zufeng Zheng, Yuhang Feng, Shuang State Key Laboratory of Smart Grid Protection and Control NARI Group Co. Ltd. Nanjing211106 China School of Electrical Engineering Southeast University Nanjing210096 China

The subsynchronous oscillation data generation method based on bidirectional long short term memory generative adversarial networks (BiLSTM- GAN) is proposed to address the lack of subsynchronous oscillation data in practical engineering. Firstly, the bidirectional long short-term memory (BiLSTM) network is introduced into the generative and discriminative models to fully exploit the forward and backward temporal sequence information of oscillation data. Then, Wasserstein distance is incorporated into the generative adversarial network (GAN) model to solve the problem of training instability. Finally, dynamic time warping (DTW)-based similarity metrics and frequency domain analysis-based authenticity metrics are proposed to assess the quality of generated samples. Case studies demonstrate that the data generated by the proposed method aligns with the characteristics of oscillation data, exhibits certain advantages in data authenticity. © 2024 Zhihui Dianli Bianjibu. All rights reserved.

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Reactive Power Coordination control Based on Vsc to Improve Lcc's Ability to Withstand Commutation Failure

SSRN

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SSRN 2023年

作者： Shu, Hongchun Shao, Zongxue Zhao, Wei State Key Laboratory of Collaborative Innovation Center for Smart Grid Fault Detection Protection and Control Jointly Kunming University of Science and Technology Kunming650500 China Faculty of Mechanical and Electrical Engineering Kunming University of Science and Technology Kunming650500 China

In order to suppress the continuous commutation failure of the line commutated converter (LCC) in the multi-infeed DC transmission system, the ability of the voltage commutated converter (VSC) in the hybrid multi-infeed DC transmission system to provide fast reactive power support is fully utilized, and a dynamic reactive power support coordination control strategy based on LCC current error controller and VSC constant AC voltage control is proposed. When the LCC experiences continuous commutation failure, the compensation amount of the extinction angle is closely related to the DC current error. The compensation amount of the extinction angle can be obtained according to the DC current error during the transient process. The reactive power support required by the LCC is calculated based on the compensated extinction angle, and the required reactive power support is prioritized to be added to the outer loop reactive power control of the VSC inverter side. By constructing a test system for doubly-fed DC transmission with flexible DC in PSCAD/EMTDC, the test results have confirmed the efficacy of the proposed dynamic reactive power coordination control strategy. The strategy has demonstrated a remarkable ability to enhance LCC's ability to suppress continuous commutation failure. © 2023, The Authors. All rights reserved.

关键词： Reactive power

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Short-term operation planning of power grid flexibility regulation under uncertain risk scenario

Short-term operation planning of power grid flexibility regu...

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Sustainable Power and Energy Conference (iSPEC)

作者： Dongliang Xie Cai Wang Yusheng Xue Yening Lai Zheng Zhang Linjun Cai Xiaofang Song Huilin Zhang Chen Yu State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation (SGRPRI) Nanjing China

ISBN: (纸本)9781665414401

Traditional power grids for volatility, uncertainty, usually set a pro rata sufficient spare margin, but when the new energy grid capacity increases, if the volatility is so great, this "one size fits all" decision is often expensive, too high thermal power start-up and even result in waste of resources. Therefore, based on the study of the multi-scale flexibility control measures of source network load storage, this paper puts forward the operation planning algorithm to reduce the total operation control risk effectively by coordinating and lowering the backup measures. Synergy with the value of various flexible resources in short-term operation planning to prevent and control the risk of wind, light and power outages in power systems, to achieve flexible operation planning. Finally, through the study, the algorithm proposed in this paper is verified that the algorithm can solve the problem of risk prevention and control in operation planning more economically and safely under the condition of large-scale grid-connected new energy.

关键词： Costs Force measurement Uncertainty Prediction algorithms Regulation Power grids Planning

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Frequency Regulation Market Performance Considering the Complementarity of Wind Park Cluster

Frequency Regulation Market Performance Considering the Comp...

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

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

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.

关键词： Wind Renewable energy sources Wind energy System integration Solar energy Regulation Power system reliability

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Transient Stability Enhancement of grid-Forming Converter in an Islanded AC Microgrid

Transient Stability Enhancement of Grid-Forming Converter in...

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International Conference on Power Electronics and Motion control (IPEMC)

作者： Yawen Ding Fei Gao Kai Hou Yingwei Jiang Qiang Gao Key Laboratory of Control of Power Transmission and Conversion Ministry of Education China College of Smart Energy Shanghai Jiao Tong University China NARI Group Corporation State Grid Electric Power Research Institute China

ISBN: (数字)9798350351330

ISBN: (纸本)9798350351347

With a growing share of renewable energy being incorporated into microgrids through power electronic converters, isolated microgrids are at higher risk of losing transient stability when exposed to significant disturbances, primarily due to the reduced inertia and increased nonlinearity inherent in power converters. This paper introduces a novel control strategy aimed at enhancing transient stability for the grid-forming converter within the islanded AC microgrid, utilizing model prediction techniques. By adjusting the output voltage of the grid-forming converter with the additional term produced by model prediction, the balance between the system’s equivalent input and output torques can be accelerated. The proposed strategy’s effectiveness and superiority are validated through simulation using MATLAB/Simulink.

关键词： Renewable energy sources Microgrids Power system stability Predictive models Stability analysis Power electronics Mathematical models

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Impact analysis of zero-sequence current rounding deviation on time-domain distance protection and its improved algorithm

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International Journal of Electrical Power and Energy Systems 2025年 169卷

作者： Shao, Mingyu He, Jiawei Li, Bin Zhou, Bohao Li, Yan Xie, Zhongrun Cao, Runbin The Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin300072 China State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin University Tianjin300072 China National Industry-Education Platform for Energy Storage Tianjin University Tianjin300350 China Electric Power Research Institute of China Southern Power Grid Guangzhou510663 China Power Dispatching and Control Center of Guizhou Power Grid Co. Ltd. 55000 China

The time-domain distance protection performs well under the influence of renewable energy generation characteristics, such as frequency offset and phase controlled character, thus having outstanding application prospects in systems with renewable power generation accessed. But, it is discovered that, the fast time-domain distance protection algorithm based on weighted accumulation might mal-operate during system normal operation. The essential reason of this issue is rounding deviation of the zero-sequence current in the protection device. Therefore, this study analyses the effect of rounding deviation in zero-sequence current on the fast time-domain distance protection. And the improved time-domain distance protection algorithm, based on the random correction of zero-sequence current, is proposed. The corresponding protection prototype is developed based on the proposed algorithm. By simulation and hardware-in-loop experiments, it is fully demonstrated that the proposed algorithm effectively mitigates the influence of rounding deviation. Furthermore, the accuracy of distance calculation during faults is not adversely affected. © 2025 The Authors

关键词： Solar fuels

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key Technologies of IoT Intelligent Sensing Terminal for smart Energy

Key Technologies of IoT Intelligent Sensing Terminal for Sma...

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

作者： Liu, Siyang Mao, Yuxing Long, Yunfeng Pan, Jianyu Jiang, Tianyan Cao, Min State Key Laboratory of Power Equipment & System Security and New Technology School of Electrical Engineering Chongqing University Chongqing China Yunnan Key Laboratory of Green Energy Electric Power Measurement Digitalization Control and Protection Electric Power Research Instute Yunnan Power Grid Co. Ltd. Yunnan Kunming China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

To build a smart energy system, we must first deploy a fully aware terminal layer to connect all energy things through perception. This paper proposes key technologies of IoT intelligent sensing terminal for smart energy. Firstly, smart energy Internet of things function is given to analyze the architecture for smart energy Internet of things. Analysis of Internet of Things terminal ecosystem is located. Finally, the key technologies including resource unified modeling, hardware and software system of Internet of things terminal are proposed. Customized design of intelligent sensing terminal is given to manufacture intelligent sensing terminal for different application scenarios of smart energy. © 2022 IEEE.

关键词： Internet of things

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Analysis of Wide-Band Oscillation Characteristics of Rudong Offshore Wind Farm Connected to the grid Through VSC-Based DC Transmission System 7

Analysis of Wide-Band Oscillation Characteristics of Rudong ...

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7th Asia Conference on Power and Electrical Engineering, ACPEE 2022

作者： Chen, Zhitong Li, Guojie Kong, Xiangping Zhang, Chi Bin, Zijun Xu, Jin Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong University Shanghai China Relay Protection Automation and Communication Technology Electric Power Research Institute State Grid Jiangsu Electric Power Co. Ltd. Nanjing China

ISBN: (纸本)9781665418195

The stability of Rudong offshore wind farm through a voltage-source converter (VSC) based DC transmission system was studied in the paper. Firstly, the electrical topology the wind farm with the DC transmission system was set up. Secondly, the control system of direct-drive wind turbines and the VSC of the DC transmission system was modeled, and then the dynamic mathematical model of the entire system was obtained. The oscillation modes of the system were analyzed by eigenvalues analysis. The state variables and influence parameters related to oscillations were obtained according to the participation factor analysis. The parameters of wind power systems integrated into the grid as well as the VSC control of were deeply studied, and the effect of parameter change on system constancy was analyzed. © 2022 IEEE.

关键词： Offshore wind farms

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