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检索条件"机构=State Key Laboratory ofSmart Grid Protection and Control"

共 400 条记录，以下是121-130 订阅

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Multi-dimensional Quantitative Evaluation of Fault Transient Characteristic Accuracy of DFIG Farm Equivalent Model 5

Multi-dimensional Quantitative Evaluation of Fault Transient...

引用

5th International Conference on Electrical Engineering and control Technologies, CEECT 2023

作者： Jiang, Hao Xu, Lixiong Cui, Xiaodan Wu, Jialong Feng, Jiaqi Zheng, Zixuan Sichuan University School of Electrical Engineering Chengdu China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing China

ISBN: (纸本)9798350342253

An accurate wind farm model is a crucial prerequisite to ensure that the simulation results of the power system containing wind power align with reality. Hence, it is imperative to establish a system for evaluating the accuracy of wind farm models. This paper examines the fault response characteristics of wind turbines and proposes a multi-dimensional quantitative index system for assessing the equivalency of wind farm models. The entire process can be segmented into two stages: the transient period immediately following the fault occurrence and the subsequent steady-state phase. The evaluation indexes for assessing the accuracy of wind farm models are voltage dynamic response, active power dynamic response, and reactive power dynamic response. These indexes are formulated to evaluate the equivalency of wind farm models across various stages. © 2023 IEEE.

关键词： Dynamic response

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The operation analysis of the CCHP driven by Gas-steam combined cycle 2

The operation analysis of the CCHP driven by Gas-steam combi...

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2nd International Conference on Oil and Gas Engineering and Geological Sciences, OGEGS 2020

作者： Liang, Junyu Yuan, Xingyu Gu, Jiangqi Yunnan Electric Power Research Institute Csg China Nari Group Co. Ltd State Key Laboratory of Smart Grid Protection and Operation Control

In combined cooling heating and power system, the gas-steam combined cycle is gradually used more and more. The common operation mode in CCHP is mainly to determine heat by electricity and heat by electricity. This paper defines an index indicator and analyzes the difference between the two operating modes in different intervals through the system energy supply interval chart, finally analyzes the difference in the indicators between the two operating modes through the actual load method. It is concluded that in winter operating conditions, the following the thermal load (FTL) operation mode is better;in summer operating conditions, the indicator of following the electric load (FEL) is better;during the transition season, the value of PEC is better in the case of following the thermal load. © Published under licence by IOP Publishing Ltd.

关键词： Thermal load

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control Strategies for the PV-Integrated Islanded Microgrid Under Normal and Fault Conditions 8th

Control Strategies for the PV-Integrated Islanded Microgrid ...

引用

8th Purple Mountain Forum on Smart grid protection and control, PMF 2023

作者： Zheng, Yuping Yao, Shenyun Wu, Tonghua Wu, Hai Zheng, Xiaojiang Xia, Lei The State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China The College of Energy and Electrical Engineering Hohai University Nanjing China

ISBN: (纸本)9789819992508

This paper describes the corresponding control strategies for the normal and fault operation states of the islanded microgrid system. The islanded microgrid system consists of distributed energy resources (DER) such as photovoltaic (PV), hybrid energy storage (HES) and microturbine (MT) and loads such as pumping unit load (PUL) and equivalent load. In the normal condition, it adopts a voltage and frequency (V-f) control strategy for the inverter of MT to maintain constant voltage and frequency of the whole system and a constant power control strategy for the rest of the power inverters. In the fault condition, the front and rear stages of the PV system adopt constant power control and reactive power compensation priority control respectively, thus realizing low voltage ride-through (LVRT). The proposed control strategies can ensure the stability of voltage and frequency of the microgrid during normal conditions and the ability of the PV system to achieve LVRT during fault conditions. A simulation model of the islanded microgrid system based on PSCAD/EMTDC is constructed and the effectiveness of the control strategies under normal and fault conditions is verified. © 2024, state grid Electric Power.

关键词： Reactive power

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LCC-HVDC supplementary controller design based on global fast terminal sliding mode control 2

LCC-HVDC supplementary controller design based on global fas...

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2nd IEEE International Conference on Energy Internet, ICEI 2018

作者： Liu, Qipu Sun, Guoqiang Nong, Weizhi Lin, Zijie Tang, Xiaochen Yang, Jia College of Energy and Electrical Engineering Hohai University Nanjing China State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation Nanjing China

ISBN: (纸本)9781538641316

Conventional LCC-HVDC is a non-linear, tightly coupled system. Since the performance of PI control varies from different operation conditions, the optimal of parameter tuning is only achieved under steady state. To improve dynamic performance and stability of system, A novel HVDC nonlinear supplementary controller based on Terminal sliding mode theorem has been proposed. First, the steady state mathematical model of the LCC-HVDC system is built, the approach of state feedback exact linearization is adopted to change the nonlinear model into a linear one, the decoupled relationship between the control variables are investigated;then based on sliding mode control method, the constant current and constant voltage control in rectifier and inverter has been achieved, respectively. The variables converge to equilibrium point fast and exactly. Finally, the strategy is demonstrated through Matlab/Simulink software, the simulation results show that the controller is capable of tracing the reference, and the robustness with respect to parameters' perturbations is satisfied. The controller contributes significantly toward improving transient performance comparing to conventional PI control and restraining commutation failure. © 2018 IEEE.

关键词： controllers

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Transient Response Characteristics Analysis of DFIG under Symmetric Voltage Sudden Changes in the grid

Transient Response Characteristics Analysis of DFIG under Sy...

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2023 IEEE Sustainable Power and Energy Conference, iSPEC 2023

作者： Jiang, Hao Xu, Lixiong Cui, Xiaodan Liu, Yang Wu, Jialong Feng, Jiaqi School of Electrical Engineering Sichuan University Chengdu China State Key Laboratory of Smart Grid Protection and Control Nari Group Corporation Jiangsu Nanjing China

ISBN: (纸本)9798350322699

Large-scale grid-connection of wind power has a profound impact on the characteristics of power grids. To study the mechanism of the influence of voltage sudden changes on the transient response characteristics of double-fed wind fields is the basis of ensuring the safe and stable operation of power grids. In this paper, the expression of rotor current under symmetrical voltage sudden changes is derived, and the related factors affecting the transient response characteristics of rotor current are analyzed. Then, a detailed DFIG model is built in PSCAD, and a variety of scenarios are simulated to verify the accuracy of the proposed doubly-fed fan's transient response characteristics under symmetrical voltage sudden changes. © 2023 IEEE.

关键词： DFIG transient characteristics Voltage sudden changes

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A Simplified Matching Algorithm of the Carbon Neutrality Path for the Industry Zones 11

A Simplified Matching Algorithm of the Carbon Neutrality Pat...

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11th International Conference on Innovative Smart grid Technologies - Asia, ISGT-Asia 2022

作者： Jin, Jingqi Li, Nan Lai, Yening Huang, Jie Chen, Xuetong NARI Technology Co. Ltd. State Key Laboratory of Smart Grid Protection and Control Nanjing China State Grid Qinghai Electric Power Company Economic and Technological Research Institute Xining China

ISBN: (纸本)9798350399660

After the carbon peaking and carbon neutrality goals were determined, industrial zones with high energy consumption began investigating their own carbon emission paths and formulating carbon emission reduction strategies. According to the zone's carbon emission projections, a reasonable estimate of the long-term carbon neutrality curve can be made, which has significant research implications for describing the carbon emission path and formulating carbon emission reduction measures. This paper uses the modified Kaya identity to build a model of the zone's carbon emissions. It proposes an algorithm for the zone's carbon-neutrality path matching the carbon peak path and determines the carbon emission peak year and carbon budget of the zone for achieving carbon peaking and carbon neutrality goals. © 2022 IEEE.

关键词： Carbon

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Rule Extraction-based Data Augmentation Method for Transient Instability Identification of Power Systems Using Machine Learning

Rule Extraction-based Data Augmentation Method for Transient...

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2019 IEEE Sustainable Power and Energy Conference, iSPEC 2019

作者： Zhou, Yanzhen Guo, Jian Guo, Qinglai Sun, Hongbin Lu, Yaohua Xu, Xiongfeng Tsinghua University Department of Electrical Engineering Beijing China Power Research Institute Nari Group Corporation State Grid Electric Jiangsu China State Key Laboratory of Smart Grid Protection and Control Jiangsu China

ISBN: (纸本)9781728149301

Machine learning methods have become a promising method for rapid identification of transient stability and unstable generators of power systems. However, the transient unstable instances are always fewer than stable instances, which brings difficulties of transient instability identification. This paper presents a data augmentation approach to increase the number of unstable instances. Firstly, original data will be generated by time domain simulation considering the randomness and limitations of power systems. Then, the patient rule induction space (Prism) method is used to obtain the unstable rule set from the training data. After that, new instances can be generated by the unstable rules and time domain simulation. Then, the machine learning method is used to generate the transient stability prediction model and unstable generator identification model based these two kinds of instances. All the generated instances can be verified by time domain simulation. Comprehensive studies are conducted on the New England 10-machine 39-bus system to verify the effectiveness of the proposed approach. © 2019 IEEE.

关键词： Transients

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Analysis of Ultra-low Frequency Oscillation Stability of Power Systems 6

Analysis of Ultra-low Frequency Oscillation Stability of Pow...

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6th International Conference on Power and Energy Technology, ICPET 2024

作者： Cai, Kesu Liu, Dongsheng Zhao, Wenshuo Hong, Xi Yin, Yao Fei, Xuanqu State Key Laboratory of Smart Grid Protection and Control NARI Group Corporation State Grid Electric Power Research Institute NanJing China School of Electrical Engineering and Electronic Information Xihua University Chengdu China

ISBN: (纸本)9798350375855

The Low-Frequency Oscillation (LFO), Ultra-Low Frequency Oscillation (ULFO) and other oscillation can endanger the safety and stability operation of the power grid. However current relevant standards only have clear provisions on the critical damping ratio of LFO. Based on the risk of ULFO in high proportion hydropower systems, the principle and key influencing factors of ULFO are derived theoretically. According to the characteristics and hazards of ULFO, a method for determining the critical damping ratio of ULFO is explored, and the effectiveness of the method is tested through the actual response trajectory. © 2024 IEEE.

关键词： Damping

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Analysis of Single-phase Grounding Fault in Low-resistance Grounding System Containing Inverter Interfaced Distributed Generator 6

Analysis of Single-phase Grounding Fault in Low-resistance G...

引用

6th International Conference on Power and Renewable Energy, ICPRE 2021

作者： Wu, Tonghua Qiao, Yida Zha, Daojun Zheng, Yuping Nari Group Corporation State Key Laboratory of Smart Grid Protection and Control Nanjing China Hefei University of Technology Anhui Province Key Laboratory of Renewable Energy Utilization and Energy Saving Hefei China

ISBN: (纸本)9781665449618

In the low-resistance grounding system with inverter interfaced distributed generator (IIDG), the IIDG widely uses the neutral point through the low-resistance grounding method. But the IIDG, which adopts the neutral point grounding through a low resistance, will affect the fault characteristics of the original low-resistance grounding system. This paper uses the symmetrical component method to establish a single-phase grounding fault model for the distribution network where the neutral points of the IIDG and the main network are grounded with low resistance. The fault current, the zero-sequence current, and the three-phase current of the line are analyzed when the upstream line of the grid connection point, the downstream line of the grid connection point, and the adjacent feeder fail. Finally, a simulation model was built using Matlab/Simulink to verify the correctness of the analysis. The conclusion provides a basis for the protection configuration of the distribution network in which the neutral points of the IIDG and the main network are grounded with low resistance. © 2021 IEEE.

关键词： Electric grounding

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High-performance Full Electromagnetic Transient Simulation System of Fujian Power grid and its Application 5

High-performance Full Electromagnetic Transient Simulation S...

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5th IEEE Conference on Energy Internet and Energy System Integration, EI2 2021

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

ISBN: (纸本)9781665434256

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 lOkV 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. © 2021 IEEE

关键词： Transients

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