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Sustainable Power and Energy Conference (iSPEC)

作者： Yang Zhao Xiangjun Quan Zaijun Wu Ling Zhu Wei Li School of Electrical Engineering Southeast University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation/State Grid Electric Power Research Institute Nanjing China

ISBN: (纸本)9781665414401

As the increasing penetration of inverter-based distributed generations (DG) reduces the inertia of the power system, the stability of the system under small disturbances is threatened. grid-forming (GFM) inverter, which can simulate inertia, damping and droop characteristics, is one of the most effective solutions. Virtual inertia and damping coefficient have important effects on the performance in primary frequency modulation. This paper presents an explicit and universal small-signal model for multi-GFM system based on the Newton-Raffson power flow algorithm in polar coordinates to realize the optimal design of virtual inertia and damping coefficient. The validity of the proposed model is demonstrated by comparing with the simulation model, and the effect of virtual inertia and damping coefficient on frequency response is analyzed in the end.

关键词： Damping Analytical models Fluctuations Power system dynamics Power system stability Frequency response Stability analysis

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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...

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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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A Fault Ride-Through Method of Paralleled Synchronous and Virtual Synchronous Generators in Islanded Microgrids

A Fault Ride-Through Method of Paralleled Synchronous and Vi...

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

作者： Yanfei Ru Feng Zhao Zhangtao Jin State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Nanjing China College of Electrical and Information Engineering Hunan University Changsha China

ISBN: (纸本)9781665434263

With the development of distributed power generation technologies, parallel operations of virtual synchronous generators (VSGs) and synchronous generators (SGs) become increasingly common in a microgrid. Due to the low overcurrent capacity of VSGs, fault ride-through (FRT) is necessary for microgrids, which makes the transient stability of SG-VSG-based microgrids be different from the traditional power system. In this paper, a new abnormal overcurrent phenomenon caused by FRT is discovered in SG-VSG-based islanded microgrids. Then, characteristics of the output current of the VSG which uses different parameters are compared and analyzed. Furthermore, an optimized FRT method is proposed, which suppresses the abnormal overcurrent. Finally, a simulation is performed to verify the effectiveness of the proposed method on the PSCAD/EMTDC.

关键词： Microgrids System integration Switches Power system stability Synchronous generators Inverters Stability analysis

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Reliability analysis of autonomous controllable protection device in power system 8

Reliability analysis of autonomous controllable protection d...

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8th International Conference on Power Electronics Systems and Applications, PESA 2020

作者： Li, Chen. Yutao, Qiu. Jianing, Chen. Xuliang, Huang. State Key Laboratory of Smart Grid Protection and Control China Co. Ltd Nanjing China State Grid Zhe Jiang Electric Power Co .LTD. China State Grid Zhejiang Electric Power Company Hangzhou Power Supply Company China

ISBN: (纸本)9781728193823

With the deepening of the concept of autonomous control in the power system, more and more attention is paid to the stability of the protection device itself. Compared with the primary equipment condition monitoring, the fault of the secondary protection device will be more concealed. This paper analyzes the factors affecting the reliability of protection devices, forms the life cycle prediction method of substation protection devices, and ensures the safe and stable operation of intelligent substation. Analyzed the reliability of the relay protection device related concepts, from the failure mechanism, through the establishment of joint aging failure based on the Arrhenius model and Weibull distribution model, and based on grid relay protection device, the data is using LM method for joint failure rate estimate the parameters of the model, get old equipment failure rate model of concrete, to determine the reliability of the protection device and the effective service life. An example shows that the model proposed in this paper can effectively predict the failure trend and life boundary of the device, and provide a theoretical basis for the daily maintenance of smart substation. © 2020 IEEE.

关键词： Weibull distribution

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A Measurement Method for Wide-frequency Harmonic Signal in Power grid Based on Window Interpolation FFT and RLS-Adaline Neural Network 2

A Measurement Method for Wide-frequency Harmonic Signal in P...

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2021 2nd International Conference on Electrical, Electronic Information and Communication Engineering, EEICE 2021

作者： Peng, Jiawei Pan, Shuguo Wang, Wenxiu Zhang, Min Shen, Jian Gao, Wang Xia, Chenglin School of Instrument Science and Engineering Southeast University Jiangsu Nanjing210096 China School of Electronic and Information Engineering Jinling Institute of Technology Jiangsu Nanjing211169 China Nari Technology Co. Ltd Jiangsu Nanjing211106 China State Key Laboratory of Smart Grid Protection and Control Jiangsu Nanjing211106 China

With the increase of non-linear loads in power grid and the development of power electronics, the growing serious harmonic pollution has put forward higher requirements for the accuracy and real-time performance of the measurement method. For this problem, this paper proposes a wide-frequency harmonic signal measurement method based on window interpolation FFT and adaptive neural network. After the window function is selected, the frequency of harmonic is estimated by double-spectrum-line interpolation algorithm based on three-term third derivative Nuttall window, and then the smoothed frequencies are input into RLS-Adaline neural network to estimate the amplitude and phase of each harmonic. The simulation results show that the proposed method has higher measurement accuracy and stability under few data conditions and low signal-to-noise ratios than conventional window interpolation algorithms. High accuracy measurement of harmonics with short time window in the range of 0∼2.5kHz is effectively realized. © Published under licence by IOP Publishing Ltd.

关键词： Fast Fourier transforms

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A Frequency control Method that Allows Regulation Sharing Among Interconnected control Areas

A Frequency Control Method that Allows Regulation Sharing Am...

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Power and Electrical Engineering (ACPEE), 5th Asia Conference on

作者： Lifeng Wang Xiaobi Teng Hua Lin Bingbing Song Kangping Qin Yutong Li Zijie Chen Dispatch and Control Branch Center East China Branch of State Grid Corporation of China Shanghai China SPIC ShanDong Energy Marketing CO. LTD Jinan China College of Smart Energy Shanghai Jiao Tong University Shanghai China Key Laboratory of Control of Power Transmission and Conversion Ministry of Education Shanghai Jiao Tong University Shanghai China

ISBN: (数字)9798350309638

ISBN: (纸本)9798350309645

Current large-scale interconnected power grids predominantly adopt the Tie-Line Bias control (TBC), where each control area is independently responsible for the power balance within its region. However, under this control mode, if a control area within the interconnected grid lacks sufficient frequency regulation capacity, the frequency of the entire interconnected grid can be affected. To allow sharing of frequency regulation capacity across multiple control areas, this article proposes a market scheme for inter-area frequency regulation capacity sharing, along with a supporting frequency control method for interconnected power grids. After meeting their own frequency regulation capacity requirements, control areas can contribute surplus capacity to a regional frequency regulation capacity market. The awarded capacity is then centrally dispatched by the regional grid, with each control area using the TBC mode and the regional grid employing the Flat Frequency control(FFC) mode. Simulation results indicate that, compared to the traditional TBC mode, our proposed scheme effectively improves the frequency quality of the interconnected grid and achieves optimized resource allocation.

关键词： Electrical engineering Simulation Asia Power grids Regulation Steady-state Resource management

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state space modelling and stability analysis of DFIG wind farm integrated through VSC-HVDC

State space modelling and stability analysis of DFIG wind fa...

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12th International Conference on Renewable Power Generation (RPG 2023)

作者： H. Su J. Xu K. Wang J. Zhou R. Yokoyama Y. Liang Key Laboratory of Control of Power Transmission and Conversion Ministry of Education (Shanghai Jiao Tong University) Shanghai People's Republic of China State Grid Jiaxing Power Supply Company Jiaxing People's Republic of China Graduate School of Environment and Energy Engineering Waseda University Tokyo Japan State Grid Smart Grid Research Institute Beijing People's Republic of China

In the interconnected system of doubly-fed induction generator (DFIG) wind farm and voltage source converter-based high-voltage direct current (VSC-HVDC), the sub-synchronous oscillation caused by the interaction between power electronic equipment and flexible DC transmission system occasionally occurs, which will endanger the safety and stability of the power systems. In order to reveal the mechanism of the above types of electrical oscillations, this paper extends the DFIG grid-connected state space model to a 24 orders detailed state space model considering DFIG connected with wind farm side VSC (WF-VSC) system. Then, the dominant state variables that affect the interconnected oscillation modes are identified by participation factor analysis. In addition, the influence of the operating point, controller, and electrical parameters on the stability of the interconnected system is analyzed based on the eigenvalue method. The analysis results show that the controller is crucial to stability, especially for the WF-VSC station. The conclusion of stability analysis is also verified by time domain simulation.

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Reliability Evaluation of a Regional Integrated Energy System Based on Complex Network Theory

Reliability Evaluation of a Regional Integrated Energy Syste...

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2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Li, Jifeng Song, Kuizheng He, Xingtang Luo, Hao State Grid Liaoning Electric Power Supply Co. Ltd Dalian Electric Power Supply Company Dalian China State Grid Liaoning Electric Power Supply Co. Ltd Dispatching and Control Center Shenyang China Tianjin University Key Laboratory of the Ministry of Education on Smart Power Grids Tianjin China Northeast Electric Power University Key Laboratory of Modern Power System Simulation and Control Renewable Energy Technology Jilin China

ISBN: (纸本)9781665414395

Most of the methods currently used to evaluate the reliability of integrated energy supply mainly consider such systems on a microgrid scale and focus on the effects of interactions among various energy carriers on the overall energy supply reliability of the system. As a result, it is difficult to analyze the system reliability in terms of its topology. Therefore, this paper proposes an approach for evaluating the reliability of a regional integrated energy system based on complex network theory. First, the feasibility of complex network theory application was analyzed based on the structural framework of the regional integrated energy system. Then, a weighted complex network model containing network characteristics was constructed by improving the 'distance' parameter in the complex network theory. Employing this model enabled the proposal of reliability evaluation indices, including nodes and the entire system, from the perspective of the system network topology. Finally, the effectiveness and applicability of the developed method were verified by constructing a test system. The application of complex network theory for reliability evaluations of regional integrated energy systems described in this paper provides guidance for planning and constructing future systems at the level of topology reliability. © 2021 IEEE.

关键词： Complex networks

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High-performance Full Electromagnetic Transient Simulation System of Fujian Power grid and its Application

High-performance Full Electromagnetic Transient Simulation S...

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

作者： Zhicheng Li Zhijun Tang Dongyuan Zhang Wujie Chao Xiaoyan Peng Yongjie Leng Fujian Key Laboratory of Smart Grid Protection and Operation Control Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian China Fujian Key Laboratory of Smart Grid Protection and Operation Control Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fuzhou China Integrated Electronic Systems Lab Co. Ltd. Jinan China

ISBN: (纸本)9781665434263

This paper proposes a high-performance full electromagnetic transient simulation system of Fujian power grid. The system is developed based on the General Transient Simulator (GTS), which is a self-developed electromagnetic transient simulation tool. The key technologies of the simulation system, such as the high-performance automatic parallel computing technology and the large time step electromagnetic transient simulation technology, are introduced. The full electromagnetic transient simulation of the AC power system above 10kV in Fujian power grid based on the dispatching control cloud platform is realized. Study cases are carried out and the validity and accuracy of the simulation are verified by comparing the actual fault recording data and simulation waveforms.

关键词： Cloud computing Computational modeling System integration Power system stability Parallel processing Power grids Dispatching

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Distributed Optimization of Multi-Microgrid Integrated Energy System with Coordinated control of Energy Storage and Carbon Emission

SSRN

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SSRN 2023年

作者： Shi, Linjun Cen, Zimeng Li, Yang Wu, Feng Lin, Keman Yang, Dongmei Lee, Kwang Y. College of Energy and Electrical engineering Hoahai University Jiangsu Nanjing211100 China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing211106 China Department of Electrical & Computer Engineering Baylor University WacoTX76798 United States Yonsei Frontier Lab Yonsei University Seoul03722 Korea Republic of

The mutual optimization of multi-microgrid integrated energy system (MMIES) can effectively improve the overall economic and environmental benefits, which is drawing increasing interest in recent years. Aiming at the scenario where an MMIES is connected to the same node, the energy storage coordination control strategy and carbon emission management strategy are proposed, and an adaptive step-size method is applied to improve the distributed optimization of MMIES based on alternating direction multiplier method (ADMM). Firstly, the basic framework of MMIES containing cold, heat, electricity and gas energy is established, and a coordinated control strategy limiting the time of charge and discharge of energy storage system (ESS) is proposed. Then a multi-objective optimization model based on operating cost and environmental cost about CO2 emissions is formulated. Considering that different microgrids may be managed by different operators and different convergence speed of multi-objective optimization iteration, an adaptive step-size distributed iterative optimization method based on ADMM is used, which can effectively reduce the cost and protect the privacy of each microgrid. Finally, a system composed of three microgrids is taken as an example for simulation analysis. The results of distributed optimization are consistent with those of centralized optimization, and the proposed coordinated control strategy can effectively control the charge and discharge times of ESS, which verifies the effectiveness of the proposed method. © 2023, The Authors. All rights reserved.

关键词： Carbon

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