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International Conference on intelligent Computing, Automation and Systems (ICICAS)

作者： Peng Zhihua Zeng Hongfa Tan Mingjian Yin Jintian Lin Li Huang Guohua Tang Jie School of Electrical Engineering Shaoyang University Shaoyang Hunan China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Shaoyang Hunan China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hengyang Hunan China

ISBN: (纸本)9781665428118

Limited by road and railway transportation conditions, the volume of large transformers cannot be increased indefinitely. For this reason, it is necessary to compress the height of the transformer core for transportation. However, the change of the core size will cause problems such as uneven distribution of the leakage magnetic field, excessive loss of the leakage magnetic field, and changes in the short-circuit impedance. Based on Magnet software, a three-dimensional transient field simulation analysis of the short-circuit performance of a 500kV single-phase three-column yoke transformer was carried out in this paper, and the leakage magnetic field and winding short-circuit impedance of the yoke transformer were obtained. The simulation results were compared with the experimental values provided by the manufacturer, showing small error, which verified the simulation method, and provided theoretical guidance for transformer design in the actual engineering.

关键词： Solid modeling Analytical models Windings Transportation Transformer cores Transformers Magnetic fields

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Magnetic field simulation and no-load loss calculation of large three-phase five-column disassembled transformer

Magnetic field simulation and no-load loss calculation of la...

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International Conference on intelligent Computing, Automation and Systems (ICICAS)

作者： Peng Zhihua Sun Yuqing Tan Mingjian Yin Jintian Lin Li Huang Guohua Tang Jie School of Electrical Engineering Shaoyang University Shaoyang Hunan China Hunan Provincial Key Laboratory of Power Grid Operation and Control in Multi-power Areas Shaoyang University Shaoyang Hunan China Hengyang Power Supply Branch of State Grid Hunan Electric Power Co. Ltd. Hengyang Hunan China

ISBN: (纸本)9781665428118

Due to the limitation of transportation conditions, the volume of the transformer cannot be increased indefinitely. Therefore, it is necessary to disintegrate the iron core for transportation. Due to structural changes, the magnetic field distribution of the transformer core may be disordered and the no-load loss is too large. This paper, based on the field-circuit coupled finite element, conducted the three-dimensional transient electromagnetic field simulation study on the no-load performance of a large-scale three-phase five-column disassembled transformer. The magnetic density, no-load current and no-load loss of the transformer iron core were calculated. The simulation results were consistent with the experiment, verifying the correctness of the simulation method.

关键词： Solid modeling Simulation Transportation Transformer cores Transformers Iron Software

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Research on Screening Method of Operating Risk Points for power System Pre-Dispatch

Research on Screening Method of Operating Risk Points for Po...

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

作者： Yi Wang Ji Zhang Qingcheng Liu Ling Xu Xin Wu NARI Group Corporation (State Grid Electric Power Research Institude) Nanjing China NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China East China Branch of State Grid Corporation of China Shanghai China

As a concept proposed by the new generation dispatching and control system, pre-dispatch is a control method for accurately adapting to situation changes and operational risks of power grid operation in the future. Regarding the problem of power system security assessment under pre-dispatch, this paper proposes a multi-snapshot grid operating risk points screening method. Three models based on optimal power flow are employed for power flow analysis after the power grid operating status changes, then the power grid operation trend data is obtained. And after initial risk screening, possible operating risk points are obtained to form a risk data set. The proposed model is tested in the IEEE39-node system. The risk data sets screened by the three models are identical, which confirms the validity of the proposed model. The proposed method for screening operating risk points can provide dispatchers with a wide range of online auxiliary decision support.

关键词： Electrical engineering power system protection Market research power grids Data models Dispatching Safety

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Design and implementation of lightweight manmachine terminal screen interactive client 4

Design and implementation of lightweight manmachine terminal...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Lv, Zhimeng Que, Lingyan Fang, Caishen Wang, Xingzhi He, Yuan Huang, Kun NARI Group Corporation State Grid Electric Power Research Institute NARI Technology Co. Ltd. Nanjing China State Grid Zhejiang Electric Power Co. Ltd. No.8 of Huanglong Road Xihu District Hangzhou China East-China Branch of State Grid Co. Ltd. No. 201 Nanjing East Road Huangpu District Shanghai China NARI Group Corporation State Grid Electric Power Research Institute National Key Laboratory of Smart Grid Protection and Operation Control NARI Technology Co. Ltd. Nanjing China

ISBN: (纸本)9781728196060

According to the characteristics of the 'physical distribution and logical integration' of the new generation dispatching automation system, this paper designs a lightweight human-machine terminal display architecture. It also proposes the componentization of the screen and its rendering technology to realize the display of electrical primitives, chart primitives, and non-viewable primitives on lightweight man-machine terminals. Besides, this paper proposes the GIS visual display technology to meet the needs of geographic information display in the dispatch automation system and put forward the interaction technology of picture linkage to improve the interaction flexibility of picture components. Relevant research results have developed prototype system and applied in the field pilot. © 2020 IEEE.

关键词： Automation

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Day-ahead optimal scheduling of integrated energy system with electric heat pump 3

Day-ahead optimal scheduling of integrated energy system wit...

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2019 3rd International Conference on power and Energy Engineering, ICPEE 2019

作者： Zhang, Nianchu Wang, Qi Ni, Ming Li, Manli Zhang, Zheng Nanjing Normal University College of Electrical and Automation Engineering Nanjing China NARI Group Corporation State Grid Electric Power Research Institute Nanjing China NARI Technology Co. Ltd. Nanjing China State Key Laboratory of Smart Grid Protection and Control Nanjing China

The regional integrated energy system is an effective way to realize energy cascade utilization and improve the flexibility and economy of the load side operation. Combine cooling heating and power (CCHP) system is a typical form of integrated energy systems. However, due to heat-load-based operation mode, the peak modulation capacity of CCHP units and the accommodation of renewable energy are limited. This paper explores methods of increasing the flexibility and economy of the system. An optimal scheduling model is proposed for integrated energy systems containing an electric heat pump, considering heating network characteristics. Simulation results show that the electric heat pump can help the system realize heat-and-power decoupling, improve the flexibility of the system and reduce the operating cost of the system. © 2020 IOP Publishing Ltd. All rights reserved.

关键词： Pumps

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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 & Energy Systems 2025年 169卷

作者： Mingyu Shao Jiawei He Bin Li Bohao Zhou Yan Li Zhongrun Xie Runbin Cao The Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin 300072 China State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin University Tianjin 300072 China National Industry-Education Platform for Energy Storage Tianjin University Tianjin 300350 China Electric Power Research Institute of China Southern Power Grid Guangzhou 510663 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.

关键词： Renewable energy Time-domain distance protection Rounding deviation Zero-sequence current Random correction

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Influence Analysis of Thermal states on Dynamic Frequency Response for power Systems with High Renewables

Influence Analysis of Thermal States on Dynamic Frequency Re...

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Sustainable power and Energy Conference (iSPEC)

作者： Yongji Cao Hengxu Zhang Changgang Li Leshu Sun Chen Li Hao Qin Qi Guo Yihua Zhu Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan China State Key Laboratory of HVDC Electric Power Research Institute National Energy Power Grid Technology R&D Centre Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China

ISBN: (数字)9781728191645

ISBN: (纸本)9781728191652

As thermal generators are substituted by renewables, the power reserves are decreasing and the influence of boiler thermal states on frequency dynamics becomes more severe. The variations of thermal states can aggravate dynamic frequency response, especially for power systems with high renewables. However, the system frequency response (SFR) model has been widely adopted, but in which the thermal states are neglected. This paper analyzes the influence of thermal states on dynamic frequency response quantitatively. The modified SFR models are built by extending the boiler models with different simplification degrees. Then, from the view of the response amplitude and time, the quantitative indices are established to measure the response trajectories of modified SFR models. And the characteristics of frequency dynamics and the statistic indices of data sequences are utilized to analyze the influences of thermal states and assess the performances of modified SFR models. According to the results of comparative analysis, the neglect of thermal states incurs more optimistic frequency dynamics and impairs the frequency stability of power systems with high renewables. Additionally, the accuracy of the SFR model can be enhanced even with the most simplified boiler model.

关键词： Analytical models power system dynamics power system stability Boilers Frequency response Thermal analysis Thermal stability

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Corrigendum to “Single-ended DC line protection scheme based on first peak time of current-limiting reactor voltage” [Int. J. Electr. power Energy Syst. 150 (2023) 109100]

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International Journal of Electrical power & Energy Systems 2023年 152卷

作者： Xiuyan Wei Guibin Zou Chaochao Chen Shuo Zhang Chenghan Zhou Shenglan Song The Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Ji’nan 250061 China State Grid Weifang Power Supply Company Weifang 261061 China

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Research on the HVDC operation Mode with Defective On-Load Tap-Changer

Research on the HVDC Operation Mode with Defective On-Load T...

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HVDC (HVDC), International Conference on

作者： Liu Cui Xuehua Lin Deyang Chen Libin Huang Qi Guo Shuyong Li State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid GuangZhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System GuangZhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid GuangZhou China

ISBN: (数字)9781728175935

ISBN: (纸本)9781728175942

The on-load tap changer(OLTC) is used in HVDC system to make sure the AC voltage or firing angle in an appropriate range. In recent years, after a number of onload tap-changer failures, many OLTCs of the same type were checked, and it was found that due to cracks and other conditions, the remaining action times of some still-operable OLTCs were far less than the theoretical action times. Due to production cycle and other reasons, defective components cannot be replaced in time. This requires that the DC system should be operated with a defective OLTCs. This article proposes several temporary operation measures: extend the interval between OLTC actions, adjust the OLTC control mode to Udi0, and avoid 70% voltage drop restart conditions. Using these temporary operation measures can effectively reduce the number of OLTC actions and extend its life, while ensuring the safe operation of the HVDC system. Simulation analysis proves the effectiveness of the scheme. This scheme has been implemented at the actual HVDC project site.

关键词： HVDC transmission power systems power grids Firing Monitoring Voltage control Valves

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Research on Real-time Simulation of Wide Area Out-of-step System in CSG

Research on Real-time Simulation of Wide Area Out-of-step Sy...

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

作者： Lifan Mao Dongxu Chang Ruicai Liu Yihua Zhu Hengdao Guo MingKang Wu Power Dispatching and Control Center Hainan Power Grid Co.Ltd Haikou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (数字)9781728196060

ISBN: (纸本)9781728196077

In order to study the action characteristics of wide area out-of-step system in CSG, the real-time simulation study based on RTDS is carried out. In this paper, a test system based on the actual devices and the settings are constructed, and the modeling methods of the important measurement such as the power angle of tie line, Ucos φ oscillation curve and the voltage at the installation point of device are studied. The operation characteristics of wide area out-of-step system are fully verified by several serious single or multiple fault cases. The analysis of the simulation results shows that the wide area out-of-step system can meet the design requirements of splitting speediness, simultaneity and selectivity, and can solve the problems of late splitting in the south channel of Guangdong and Guangxi section, as well as the problem that the system cannot recover stability after splitting Guangdong and Guangxi, Guizhou and Guangxi section simultaneously.

关键词： Voltage measurement Stability criteria power system stability Real-time systems Data models Transient analysis Oscillators

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