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smart Power & Internet Energy systems (SPIES), International Conference on

作者： Junjun Yang Xianyu Zha Wang Tu Yinbao Zhang Helin Sun Delong Zou Xuanyi Fu NARI Group Corporation (State Grid Electric Power Research Institute) State Key Laboratory of Smart Grid Protection and Control Nanjing China State Grid Beijing Electric Power Company Beijing China

The urban power grid is integrated operation of transmission and distribution with close electrical coupling. Considering the interaction between the distributed generation and load characteristics of the distribution network and the disturbance of the transmission network, the accurate evaluation of the voltage sag index based on the full electromagnetic model is of great significance for the safe operation of the power grid and the reliable power supply. In this paper, an online dynamic equivalence method based on the full voltage level of the transmission and distribution network model is proposed, which not only ensures that the key dynamic modes of the system are not lost, but also greatly reduces the scale of the network involved in the calculation. An online assessment and control strategy optimization method of voltage sag that integrates physical mechanism and electromagnetic transient simulation technology is proposed. This method can quickly and accurately give the evaluation index to characterize the voltage sag, in order to screen the area of vulnerability effectively and formulate the control strategy. It provides a basis and improves the real-time and pertinence of power grid voltage sag analysis and control. Through the simulation analysis of an online example of a large urban power grid, the effectiveness and practicability of the proposed method are verified.

关键词： Couplings Analytical models Simulation Power quality Power system dynamics Distribution networks Electromagnetic modeling

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Image Quality Assessment Based on Sparse Reference Information 18th

Image Quality Assessment Based on Sparse Reference Informati...

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18th International Forum of Digital Multimedia Communication, IFTC 2021

作者： Lian, Xinkang Xie, Shuangyi Shi, Shuang Zhou, Chengxu Guo, Nan Engineering Research Center of Intelligent Perception and Autonomous Control Ministry of Education Beijing China Beijing Key Laboratory of Computational Intelligence and Intelligent System Beijing China Beijing Laboratory of Smart Environmental Protection Beijing China Faculty of Information Technology Beijing University of Technology Beijing China Beijing Artificial Intelligence Institute Beijing China

ISBN: (纸本)9789811922657

The last few years have seen the appearance of a new sparse reference-based free energy principle, which demonstrates that an input visual signal was always strived to be comprehend by the human visual system (HVS) through removing the undetermined portions. By this inspiration, we in this paper put forward an image quality assessment (IQA) model based on sparse reference information. In essential, as compared with the classical good-performance FEDM model that was developed with a linear local autoregressive (AR) model, the proposed sparse reference (SR) IQA model is a simplified version of FEDM, achieving comparable performance but hundreds of times faster implementation. More specifically, this paper introduces the extremely sparse random sampling method into the FEDM model. Experimental results on the most well-known LIVE IQA database illustrate the effectiveness along with efficiency of our SR-IQA model as compared with the typical full-reference IQA models and the cutting-edge SR IQA models. © 2022, Springer Nature Singapore Pte Ltd.

关键词： Free energy

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Low-Frequency Offshore Wind Power Transmission system with Dual-End grid-Forming control

Low-Frequency Offshore Wind Power Transmission System with D...

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International Conference on Renewable Energy and Power Engineering (REPE)

作者： Nan Fu Bao Liu Yunfei Xu Sitong Zhu Kui Wang Yongdong Li State Key Laboratory of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China Electric Power Research Institute of State Grid Liaoning Electric Power Co. Ltd. Shenyang China

ISBN: (数字)9798350375558

ISBN: (纸本)9798350375565

The offshore wind power has been gaining increasing attention in recent years. Low-frequency alternating current (LFAC) transmission is emerging as a promising technology with specific advantages for offshore wind power transmission. This paper discusses the structure and control of the offshore wind power transmission system based on LFAC. In order to enhance the support for the power system, grid-forming control can be implemented on both sides of the modular multilevel matrix converter (M3C) used in LFAC. Additionally, the capacitor voltage control of M3C is briefly introduced. Furthermore, power reserve control is utilized to enable wind turbines to participate in primary frequency regulation. Finally, the effectiveness of the designed control system is verified through simulation using PSCAD/EMTDC, further demonstrating the efficacy of the strategy.

关键词： Current control Capacitors Wind power generation Wind farms control systems Wind turbines Voltage control Matrix converters Frequency control grid forming

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Transition Metal (AU, Ag, Pt, Pd, Ni) Doped MoS2 as Gas Sensing Materials for C4F7n Leakage Detection: A Comparative Study

SSRN

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SSRN 2023年

作者： Yan, Yongxu Li, Yi Zhang, YiFan Wu, Peng Tang, Ju Zhang, Xiaoxing Xiao, Song State Key Laboratory of Power Grid Environmental Protection School of Electrical Engineering and Automation Wuhan University Wuhan China Key Laboratory for High-Efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan430068 China

Fluorinated nitrile (C4F7N) has been considered a novel eco-friendly gas insulating medium, while the low toxicity and leakage risk urgently urge the development of C4F7N gas sensor. Herein, we analyzed the sensing performance of transition metal doped MoS2 to C4F7N based on the density functional theory (DFT). The adsorption energy, charge transfer, deformation charge density and density of states were explored. Furthermore, the sensitivity and recovery performance were analyzed based on frontier orbital and transition state theories. It was found that Pd-MoS2 can achieve a superior balance between sensitivity and response time, showing promising potential for C4F7N leak detection for engineering applications. © 2023, The Authors. All rights reserved.

关键词： Density functional theory

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Model Predictive control Based Active Frequency Support Strategy for Combined Wind/Photovoltaic/Storage Power Station

Model Predictive Control Based Active Frequency Support Stra...

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China International Electrical and Energy Conference (CIEEC)

作者： Manliang Wang Bingtuan Gao Yingwei Jiang Yunfeng Tian Wenqi Dong Xuewei Shi School of Electrical Engineering Southeast University Nanjing China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China State Grid Hebei Zhangjiakou Scenery Storage and Transmission New Energy Co. Ltd Zhangjiakou China

The high penetration of renewable energy sources connected to the grid has brought great challenges to the frequency stability of the power system. For the combined wind/pohotovoltaic/storage power station, it is of great significance for better frequency performance to realize the coordination control of active power. Therefore, this paper presents a frequency active support strategy for combined wind/pohotovoltaic/storage power station. By establishing the model of combined wind/pohotovoltaic/storage power station, this strategy applies model predictive control (MPC) to optimize the total active power reference value and the allocation of response power of the combined wind/pohotovoltaic/storage power station. For obtaining better frequency performance, this strategy aims at absorbing wind and solar energy resources and improving the economy of energy storage station. In order to verify the performance of the proposed strategy, it is compared with droop control using MATLAB/Simulink when the load increasing and decreasing respectively. The simulation results clearly show the effectiveness of the active frequency support strategy proposed in this paper.

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Instantaneous Frequency Measurement and Tracking under Out of Step Oscillation

Instantaneous Frequency Measurement and Tracking under Out o...

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IEEE International Conference on smart grid and smart Cities (ICSGSC)

作者： Ke Su Cai Gan Feng Zhang Rong Rong Ji Sui Sheng Zheng Cheng Lin Xia Tian Yu Lan State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation State Grid Electric Power Research Institute NanJing China Ultra High Voltage Branch Company State Grid Zhejiang Powe Company HangZhou China NARI Group Corporation State Grid Eelectric Power Research Institute NanJing China

As an important operating parameter of the power system, the instantaneous frequency of the current can reflect the actual operating state of the current system, especially when the system is out of step. The characteristics of the current in the oscillation line are analyzed in this paper. An algorithm for measuring instantaneous frequency of current while power system swings is presented, based on the broad definition of angular frequency. According to the feature of the actual power system, a new method for measuring the instantaneous current frequency by real-time sampling is proposed. Finally, the algorithm is simulated on the model of the equivalent systems. When the system swings, the real-time frequency is gained by sampling the current in the line, combined with the frequency of the equivalent machine of both sides. It shows that the obtained current frequency is reasonable and effective, compared to the characteristics of the system.

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Research on Reliability Improvement Scheme of Network in smart Substation 1

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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： Shen, Bing Lu, Zhihao Lv, Hang Yang, Gui Li, Li State Grid Shanghai Municipal Electric Power Company Shanghai200122 China State Key Laboratory of Smart Grid Protection and Control Nanjing Jiangsu211106 China NR Electric Co. Ltd. Nanjing Jiangsu211106 China

ISBN: (数字)9789811597466

ISBN: (纸本)9789811597459

The data sharing based on process level network is the development trend of the digitalization of the secondary circuit in smart substation. However, abnormal problems of data transmission such as network storms bring certain hidden dangers to the safe and stable operation of the secondary equipment. In this paper, the main problems affecting the reliability of data transmission are analyzed, and the message management technology based on data flow control is proposed, which can effectively improve the reliability of data transmission. Aiming at the problem of cross-network data exchange, a solution based on cross-network port flow control is also proposed. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Flow control

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smart substation network quality monitoring and fault prediction

Smart substation network quality monitoring and fault predic...

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2021 International Conference on Power Electronics and Power Transmission, ICPEPT 2021

作者： Li, Chao Peng, Qi Wang, Dehui Luo, Linglu Zuo, Huanhuan NARI Group Corporation State Grid Electric Power Research Institute Nanjing211006 China NARI Technology Co. Ltd. Nanjing211006 China State Key Laboratory of Smart Grid Protection and Control Nanjing210061 China

The smart substation communication network is the basis for information sharing of various devices in the substation. Its operation status has an important impact on the safe operation of the substation and even the power grid. Therefore, real-time status monitoring of the smart substation communication network is becoming more and more important. Aiming at the problems of single dimension, insufficient real-time performance and manual fault analysis in existing substation communication network state monitoring technology, this paper proposes a method of smart substation communication network state monitoring and fault prediction based on network communication quality. This paper uses switch ACL technology and coloring technology to obtain communication quality indexes such as bandwidth utilization, delay, and packet loss rate in real time;based on a multi-dimensional evaluation algorithm, a comprehensive evaluation model of network communication quality is constructed;the model of the relationship between abnormal network communication quality and failures is established. Finally, real-time monitoring of network communication quality and fault prediction are realized. The application analysis in a typical 110 kV substation shows that this method can effectively evaluate the network communication quality and accurately predict failures, and can guide operationer and maintenaner to quickly restore the normal operation of the communication network. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Telecommunication networks

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Research on Man-Machine Service Reliability of New Generation Power system 3

Research on Man-Machine Service Reliability of New Generatio...

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2021 3rd International Conference on Electronic Engineering and Informatics, EEI 2021

作者： Yin, Xia Li, Lulu Lv, Zhimeng Yan, Zhen Xu, Hua Zhao, Kun Huang, Kun 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

With the rapid growth of smart grid dispatching business scale, the traditional fat client mode power system has a large degree of business coupling, which limits the power grid dispatching business. But the lightweight man-machine cloud terminal and man-machine service framework have greatly reduced the coupling degree of the grid dispatching system business. The appearance of man-machine service reduces the development cost of client, and makes the unified browsing of multi system and multi terminal equipment easier. However, how to ensure the reliability and stability of man-machine interaction service is a question worthy of discussion. How to adapt to the interaction of a lot of clients and to adapt to the requests of different clients put forward higher requirements for man-machine service. This article describes the man-machine service architecture and key technologies to ensure reliability, introduces technologies such as load balancing and thread pools that adapt to the characteristics of power grid human-computer interaction, introduces in detail the distributed job scheduling management mechanism within the man-machine service, and describes the standardized request and return result of man-machine service. Finally, through sample testing and on-site operation, demonstrate the reliability of the man-machine service. © Published under licence by IOP Publishing Ltd.

关键词： Reliability

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The Commonality of Economic Dispatch Models Based on Scenario/Interval

The Commonality of Economic Dispatch Models Based on Scenari...

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

作者： Yishen Wang Renjie Wei Fengbin Sun Ruihan Zhang Tiechui Yao Lan Ren Future Science Park State Grid Smart Grid Research Institute Co Ltd Beijing China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education State Grid Smart Grid Research Institute Co Ltd Shandong University Jinan China

With the increasing penetration of renewable energy, how to maximize the acceptance of renewable energy on the basis of satisfying the economy security and reliability of the power system is an urgent problem to be solved. In this area, mathematical optimization methods such as robust optimization and stochastic optimization are generally used to construct models based on different uncertainty descriptions. Previous studies have shown that robust optimization has high computational efficiency but conservative results, while stochastic optimization has low computational efficiency but accurate results. Therefore, different studies will choose suitable methods based on the characteristics of the models to be constructed. However, existing studies have not thoroughly discussed whether there is a connection between the two methods. This paper first proposes an economic dispatch model based on scenario considering the admissible region of net load, and introduces a new affine strategy to transform this model into a deterministic form. Secondly, based on further exploration of the characteristics of economic dispatch models based on scenario/interval, the paper concludes that the two models are common when they are sufficiently precise. Finally, the correctness of the conclusion is verified on the IEEE-RTS system.

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