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IEEE International Conference on power and power and Renewable Energy (ICPRE)

作者： Tao Jun A Minfu Wu Xiaoxi Zhong Ming Inner Mongolia enterprise key laboratory of smart grid simulation of electrical power system Inner Mongolia Electric Power Research Institute Hohhot China

ISBN: (数字)9781728145747

ISBN: (纸本)9781728145754

The third-harmonic stator grounding protection is widely used in China to monitor the stator insulation of the generator. This protection would send wrong signal in engineering applications. This paper introduces the principle and implementation method of the third harmonic stator grounding protection. According to the generation mechanism of the third harmonic electric potential of the generator, this paper analysis the Various influencing factors of ratio calculation principle, and fixed value optimization advice of the third harmonic stator grounding protection is proposed. Fixed value optimization in engineering applications also recommended.

关键词： Generators Harmonic analysis Grounding Stator windings power system harmonics Resistance

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Corrigendum to ‘Distributional two-level synergetic unit commitment considering three scheduling states’

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Electric power systems Research 2023年 216卷

作者： Yumin Zhang Xuan Zhang Xingquan Ji Ming Yang Xueshan Han Ziyang Yin College of Electrical Engineering and Automation Shandong University of Science and Technology Qingdao 266590 China Key Laboratory of Smart Grid of Ministry of Education Tianjin University 300072 Tianjin China Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Ministry of Education Jinan 250061 China

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Study on Subsynchronous Resonance Damping Control for Series-Compensated DFIG-Based Wind Farm

Study on Subsynchronous Resonance Damping Control for Series...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Luo, Chao Guo, Qi Xiao, Xiangning Gole, A.M. Liao, Mengjun Electric Power Research Institute State Key Laboratory of HVDC China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China North China Electric Power University State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources Beijing China University of Manitoba Electrical and Computer Engineering Department Winnipeg Canada

ISBN: (纸本)9781728149301

Subsynchronous Resonance (SSR) is a potential threat for long distance power transmission from doubly fed induction generator (DFIG) based wind farms with fixed series compensation (FSC). In this paper, subsynchronous resonance damping control (SSRDC) strategy based on shunt voltage source converter is proposed. Taking account of different series compensation levels and wind speeds, several potential inputs to the SSRDC are investigated. SSRDC control parameters are determined via root locus techniques to ensure the system stability of subsynchronous modes. Considering implementation feasibility in practical project and stability of supersynchronous modes, an enhanced SSRDC is proposed. Impact of transmission line and DFIG parameters and the reactive power compensation to the mitigation effect is investigated. Time domain simulation using PSCAD/EMTDC are carried out to validate the effectiveness of the SSRDC. © 2019 IEEE.

关键词： Wind farm

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Dynamic Test for DC Training Emulation system with Back-to-back MMC

Dynamic Test for DC Training Emulation System with Back-to-b...

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Sustainable power and Energy Conference (iSPEC)

作者： Zaixin Yang Lixin Xing Baiqing Yin Yunmin Wang Yuqiang Wang Chen Gao Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Institute of Relay Protection Inner Mongolia Electric Power Science & Research Institute Hohhot China

With the development of VSC-HVDC and engineering applications, establishing a modular multilevel converter (MMC) platform is extremely important for simulation research and training. In this study, a back-to-back MMC emulation system with a converter station level is developed. Dynamic tests are performed to verify the stability performance and the dynamic performance of the respective physical devices under asynchronous interconnection conditions. The results show that the system can perform automatic control for the sequence of blocking, uncontrolled charging, controlled charging, and unlocking operations. A remarkable power quality effect is obtained by using a controller for circulating current suppressing (CCS). Using a visual station operation interface, the dynamic index of the power step test is found to conform to the test standard, and the system exhibits stable operation.

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Effect of long-term fluorination on surface electrical performance of ethylene propylene rubber

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High Voltage 2019年第4期4卷 339-344页

作者： Rujia Men Zhipeng Lei Tao Han Davide Fabiani Chuanyang Li Simone Vincenzo Suraci Jian Wang Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control College of Electrical and Power EngineeringTaiyuan University of TechnologyTaiyuan 030024People's Republic of China Department of Electrical Electronicand Information Engineering‘Guglielmo Marconi’University of BolognaViale Risorgimento 2Bologna 40136Italy Key Laboratory of Smart Grid of Education Ministry School of Electrical and Information Engineering Tianjin UniversityTianjin 300072People's Republic of China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityChangping DistrictBeijing 102206People's Republic of China

To investigate the effect of fluorination on surface electrical performance of ethylene propylene rubber(EPR),four pieces of EPR specimens are prepared and fluorinated for different duration ranging from 120 min to 480 *** surface morphology and element compositions of experimental specimens are *** surface potential decay and complex permittivity are *** tracking discharge property and the erosion properties after tracking test are *** surface charge transport and electrical property tailoring mechanism are *** results show that when the fluorination duration is from 120 min to 360 min,the surface morphology gradually becomes flat and compact with time,and the surface resistance to electrical tracking is *** an excessive fluorination with the duration of 480 min leads to a significant increase in surface conductivity and a weakening in the resistance to electrical tracking,which is mainly due to a change in surface *** recommended fluorination duration for an optimised surface property is between 240 and 360 min for EPR specimen.

关键词： electrical propylene rubber

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Evaluating Comprehensive Development Quality of a Regional power grid by Using an Integrated Multi-criteria Decision-Making Methodology 6

Evaluating Comprehensive Development Quality of a Regional P...

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2019 6th International Conference on Advanced Composite Materials and Manufacturing Engineering, ACMME 2019

作者： Zhang, Xiaodong Qin, Kaiming Si, Ruihua Ge, Xianjun State Grid Henan Electric Power Company Zhengzhou450018 China State Key Laboratory of Power System and Power Generation Equipment Control and Simulation Department of Electrical Engineering Tsinghua University HaidianBeijing100084 China

Due to the economic situation changes and the continuous expansion of new energy power in China, a new evaluation methodology based on multi-criteria decision making (MCDM) should be proposed to promote the comprehensive development of the new regional power grid. Some criteria were selected to constitute an indicator system from the perspectives of the safety reliability, network structure and economic benefit. Then, an integrated evaluation model was proposed based on fuzzy AHP method and VIKOR method was applied to calculate a series of comprehensive evaluation indexes. A regional power grid was chosen as an empirical analysis to demonstrate the feasibility of the evaluation system. © Published under licence by IOP Publishing Ltd.

关键词： Decision making

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Evaluation Model for smart Distribution Network Planning under Energy Interconnection 3

Evaluation Model for Smart Distribution Network Planning und...

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3rd International Symposium on Resource Exploration and Environmental Science, REES 2019

作者： Zhang, Yan Jiang, Zefu Liu, Jinsen Liu, Wenxia Gao, Hua Wang, Yanmin Power Grid Planning Research Center of Guizhou Power Grid Co. Ltd Guiyang Guizhou550003 China State Key Laboratory of Power System and Power Generation Equipment Control and Simulation Department of Electrical Engineering Tsinghua University Haidian Beijing100084 China

Due to the development of the energy interconnection, smart distribution networks (SDNs) should needs be transformed and upgraded to meet new demands. In order to assess the SDN planning, a new index system was conducted from the five attributes. The quantitative methods of all criteria were also defined. An evaluation model was proposed based on AHP weighting and TOPSIS methods. Empirical analysis was performed to verify the feasibility of the evaluation system. © Published under licence by IOP Publishing Ltd.

关键词： Interconnection networks (circuit switching)

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Investigating the transient torque of turbo-generators in a power system integrating wind farms 8

Investigating the transient torque of turbo-generators in a ...

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8th Renewable power Generation Conference, RPG 2019

作者： Yang, Bowen Yan, Gangui Xie, Xiaorong Wang, Yanhui Tang, Jian Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China State Grid East Mongolia Electric Power Supply Co. Ltd. Hohhot China

ISBN: (纸本)9781839531255

The renewable energy sources connected to the grid will cause the power system to oscillate and even affect neighbouring turbo-generators. For example, the wind turbines and their converter control systems may cause shaft torsional vibration in the steam turbine units, which affects the safety of the system. Therefore, it is of significance to investigate the transient torque of turbo-generators in a power system integrating wind farms. This paper takes a power plant in Inner Mongolia area of China as the case, the power of which is transmitted via the AC/DC hybrid power system with wind and thermal power. A typical equivalent system model of the wind-thermal-bundled access network is established firstly. Consider setting the fault on the line with series capacitor compensation and observe units' torque variation. Then the impact on sub-synchronous resonance (SSR) characteristics from many factors was investigated through the time-domain simulation, including the unit combination mode (including the long-term accessed DFIGs condition), the fault type and position, the system equivalent impedance, the fault starting/clearing time and the mechanical mutual damping coefficient of shafting, etc. Finally, the influence of each factor on transient torque is summarized, and the inner associations between the shaft torsional vibration in the turbo-generators and the converter-based wind turbines are clarified. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Wind turbines

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Research on Optimal Dispatching simulation Model of Active Distribution Network

Research on Optimal Dispatching Simulation Model of Active D...

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作者： Yunmin Wang Zaixin Yang Jiangping Wang Ziwen Liang Zihao Wang Inner Mongolia Enterprise Key Laboratory of Smart Grid Simulation of Electrical Power System Inner Mongolia Electric Power Research Institute College of Electronics and Information Engineering Tongji University

It is a technical difficulty for the safe and economic running of active distribution network to control and manage distributed generators, energy storage system and load flexibly and effectively to eliminate the effect of distributed energy uncertainty on grid. In order to achieve the optimal coordinated control of active distribution network, a topology structure of active distribution network based on improved IEEE 33 nodes network is established. Including photovoltaic power generation systems, wind power generation system and energy storage system, a simulation model of active distribution network is built by using PSCAD/EMTDC. By adopting the optimized control strategy of the converter, the voltage of each node in active distribution network is stable, thus the validity and stability of the model are verified.

关键词： active distribution network dispatching control photovoltaic generation system wind turbine system energy storage system

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Robust Integrated optimization of Active Distribution Network Based on system Risk Index

Robust Integrated optimization of Active Distribution Networ...

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IEEE Student Conference on Electric Machines and systems

作者： Yumin Zhang Haishu Gao Xingquan Ji Qi Liu Yixiao Yu College of Electrical Engineering and Automation Shandong University of Science and Technology Qingdao China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

This paper presents a comprehensive distribution robust optimization model based on the distribution network risk index to address the distributional uncertainties of distributed generations (DGs) and loads. To analyze the security of active distribution network (ADN) systematically, a risk assessment method based on improved semi-invariant method and clustering technique is proposed. The risk assessment method is performed on the integrated dynamic reconfiguration and reactive power optimization model. This method can consider the correlation between distributed power sources, and when the injected power is large, the calculation results with higher accuracy can be obtained Case studies on the PG&E 69-bus system verify the robustness and feasibility of the proposed model.

关键词： Uncertainty power supplies Computational modeling Risk management Indexes Optimization Load modeling

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