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IEEE Student Conference on Electric Machines and systems

作者： Wei Hou Mingqiang Wang Xin Wang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China State Grid Shandong Electric Power Construction Company Jinan China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156231

With the development of China's power market, more and more large industrial customers are participating in electricity market transactions, and they gradually began to pay attention to economic power consumption issues. Based on real data, this paper analyzes how large industrial customers make the best decisions to lower their electricity payment considering various real characteristics such as order requirement of production lines, specific production process, and continuity of power consumption, etc. The proposed model realizes the economic power consumption by adjusting the daily production schedule of large industrial customers. The feasibility and effectiveness of the proposed model are illustrated by case studies.

关键词： Economics Schedules power demand Production power markets Mathematical model Load modeling

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Modeling and control of Central Air Conditioning Loads for Peak Shaving

Modeling and Control of Central Air Conditioning Loads for P...

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2019 IEEE PES Asia-Pacific power and Energy Engineering Conference, APPEEC 2019

作者： Cheng, Dingyi Zhang, Wen Liu, Meng Intelligent Dispatch and Control of Ministry of Education Shandong University Key Laboratory of Power System Jinan China State Grid Shandong Electric Power Research Institute Jinan China

ISBN: (纸本)9781728108131

Peak shaving can be realized by applying appropriate control on central air conditioning loads due to their large proportion and thermal energy storage characteristics. Simplified model of single central air conditioner is established by analyzing its operating principle. Based on individual model, optimal control model of central air conditioning loads for participating in peak shaving is proposed. Objective is to obtain maximum loads of peak shaving. Constraints take peak shaving and users' comforts into consideration. It should be noted that this optimization model is a mixed integer linear programming and can be solved conveniently. Based on the test platform for central air conditioner, the correctness of individual model can be verified. The effectiveness of optimal control model for peak shaving is verified by simulation results. © 2019 IEEE.

关键词： Integer programming

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Static voltage stability domain and power margin for multi-infeed DC system during recovery process 3

Static voltage stability domain and power margin for multi-i...

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3rd IEEE International Conference on Energy Internet, ICEI 2019

作者： Yang, Shandong Wang, Hongtao Yang, Dong Ma, Huan Zhao, Kang Key Laboratory of Power System Intelligent Dispatch Control Ministry of Education Shandong University Jinan China Shandong Electric Power Research Institute State Grid Jinan China

ISBN: (纸本)9781728114934

During the recovery of multi-infeed DC system after blackout, utilizing DC transmission to support the load recovery of receiving AC system can largely speed up the recovery process, but it will increase the challenges of voltage collapse at the same time because of the impactful reactive power consumption of DC. In order to avoid voltage collapse and give the power margin for recovery, this paper proposed the static voltage stability domain method to study the static voltage stability of DC participating in recovery. First, the impact of DC power is taken into account by adding DC power as variable parameters to the continuous power flow algorithm. Second, voltage collapse points are calculated using the improved continuous power flow algorithm to shape the static voltage stability domain. Then, the AC/DC power margin is defined as the shortest distance between operating point of system and the boundary of static voltage stability domain. Finally, the AC/DC power margin is calculated by using the normal of the boundary of static voltage stability domain to amend the power growth direction. The proposed AC/DC power margin can not only evaluate the voltage stability margin of multi-infeed DC system, but also guide the power recovery control. The effectiveness of this proposed method is validated in the test system. © 2019 IEEE.

关键词： Recovery

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Start-up Sequence Optimization of Units and HVDC for Hybrid Multi-Infeed DC Receiving systems

Start-up Sequence Optimization of Units and HVDC for Hybrid ...

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2019 IEEE PES Asia-Pacific power and Energy Engineering Conference, APPEEC 2019

作者： Li, Peng Wang, Hongtao Yang, Dong Ma, Huan Zhao, Kang Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China Shandong Electric Power Research Institute State Grid Jinan China

ISBN: (纸本)9781728108131

Aiming at the problem of unit restoration optimization of hybrid multi-infeed direct current (HMIDC) system, an optimization method for start-up sequence of units and HVDC in HMIDC receiving system with LCC-HVDC and VSC-HVDC participation is proposed. Firstly, the interaction between AC and DC systems in the restoration process is analyzed. Then, the multi-objective optimization model of start-up sequence considering HVDC start-up constraints and operational stability constraints is established. And an algorithm based on fast non-dominated sorting genetic algorithm (NSGA-II) for solving the above model is designed. Finally, the feasibility and effectiveness of the proposed method are verified by using IEEE 39 nodes system as an example. © 2019 IEEE.

关键词： Restoration

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Research on Fault Early Warning of Wind Turbine Pitch system based on Long Short-Term Memory Neural Network

Research on Fault Early Warning of Wind Turbine Pitch System...

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Chinese Automation Congress (CAC)

作者： Xiongwei Li Guanghua Lv Runze Zhu Gengda Li Zhongwei Lin Wenbin Wang Qingru Cui China Energy New Energy Technology Reserch Institute Co. Ltd Beijing P. R. China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control Computer and Engineering North China Electric Power University Beijing P. R. China

ISBN: (纸本)9781665426480

To reduce the downtime of wind turbine caused by the fault of pitch system that usually has a high failure rate, a fault early warning method based on long short-term memory (LSTM) neural network is proposed. According to the operation characteristics of the pitch system, monitoring parameters recorded by SCADA, such as wind speed, generator speed, rotor speed, wind direction, pitch angle and output power, are utilized to establish the fault early warning model. Compared with the model based on BP neural network, the prediction accuracy of the LSTM model is effectively improved. The weights and thresholds of the LSTM neural network are optimized, and a reasonable threshold is set to determine the fault early warning criterion for the pitch system. To verify the effectiveness of the proposed method, the LSTM model is applied to the fault early warning for a 1.5MW wind turbine pitch system. The results show that the LSTM model can give early warning about two and a half days before the fault occurs, verifying the feasibility of the proposed method.

关键词： Automation Wind speed Neural networks Rotors Predictive models Wind power generation Generators

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Back Cover Image: Carbon Neutralization, Volume 2, Issue 5, September 2023

Carbon Neutralization

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Carbon Neutralization 2023年第5期2卷

作者： Zhenhai Gao Haicheng Xie Xianbin Yang Lisheng Zhang Hanqing Yu Wentao Wang Yongfeng Liu Youqing Xu Bin Ma Xinhua Liu Siyan Chen College of Automotive Engineering Jilin University Changchun China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun China School of Transportation Science and Engineering Beihang University Beijing China State Grid Jilin Electric Power Company Limited Changchun China

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Research on Equalization Effect of Dynamic Reconfigurable Battery Management system

Research on Equalization Effect of Dynamic Reconfigurable Ba...

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2019 IEEE Sustainable power and Energy Conference, iSPEC 2019

作者： Wan, Yuxiang Cheng, Lin Jiang, Yi Wang, Zhidong Liu, Mei Tsinghua University State Key Lab. of Control and Simulation of Power System and Generation Equipment Beijing China State Grid Corporation of China State Grid Economic and Technological Research Institute Corporation Limited Beijing China

ISBN: (纸本)9781728149301

The battery differences not only affect the reliability and security of battery packs but also accelerate the decline of the packs' life. Although battery management systems (BMS) and equalization circuit can be used to balance the differences, only the whole battery pack can be protected with high-cost and complex circuits. Dynamic reconfigurable battery management system (DRBMS) based on networked control has a simple principle and can shield the differences of battery cells. This paper designs experiments for the dynamic reconfigurable battery network technology and makes a contrast with the traditional BMS. Through the analysis of voltage, SOC difference and dynamic resistance during charging and discharging, the results show that DRBMS has better voltage and capacity equalization effect than BMS. The cells of paralleled battery packs can be fully charged/released in DRBMS. It is also verified that DRBMS is applicable on decommissioned bus battery packs which are of larger differences and the ladder utilization. © 2019 IEEE.

关键词： Battery management systems

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Erratum to: Effect of ambient pressures on laser-induced breakdown spectroscopy signals

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Frontiers of Physics 2024年第4期19卷 1-1页

作者： Zhang, Kaifan Song, Weiran Hou, Zongyu Wang, Zhe State Key Laboratory of Power System Operation and Control Tsinghua-Rio Tinto Joint Research Centre for Resources Energy and Sustainable Development International Joint Laboratory on Low Carbon Clean Energy Innovation Institute for Carbon Neutrality Department of Energy and Power Engineering Tsinghua University Beijing China Shanxi Research Institute for Clean Energy Tsinghua University Taiyuan China

The pressure legend in Fig. 6(a) was incorrectly labeled and has been updated in this new version.

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Frequency-coupled impedance model based subsynchronous oscillation analysis for direct-drive wind turbines connected to a weak AC power system

Frequency-coupled impedance model based subsynchronous oscil...

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7th International Conference on Renewable power Generation, RPG 2018

作者： Liu, Wei Xie, Xiaorong Shair, Jan He, Jingbo State Key Laboratory of Power System Department of Electrical Engineering Tsinghua University Beijing China National Power Dispatching and Control Center Beijing China

Recently, the emerging subsynchronous oscillation (SSO) issue caused by interactions between power electronic converters and weak grids has provoked serious stability concerns. Impedance modelling based method has been widely used to analyse the emerging SSO phenomenon. In this paper, a frequency coupled impedance model (FCIM) is proposed to analyse this interaction. The FCIMs at multiple frequencies are measured and then the transfer function model is identified. The modelling method is then applied to type-4 wind turbine based farms connected to a weak AC grid. The aggregated impedance of the whole system is obtained by combining the FCIMs of all components in the power system. The system stability is then investigated by varying the online number of wind turbines. Time-domain simulations using PSCAD/EMTDC are carried out to verify the proposed methods of impedance modelling and stability analysis. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： system stability

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Development and test research of 10kv DC circuit breaker based on the principle of coupled negative voltage

Development and test research of 10kv DC circuit breaker bas...

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The 16th IET International Conference on AC and DC power Transmission (ACDC 2020)

作者： W. Li B. Liu F. Xiao H. Wang Y. Wang W. Xie Z. Yu Shandong Taikai High-Voltage Switchgear Co. Ltd. Tai’an China China Electric Power Research Institute Beijing China Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment (Department of Electrical Engineering Beijing China

With the increase of multi-terminal flexible DC distribution network projects, medium-voltage DC circuit breaker, as the key equipment to remove DC short-circuit fault, plays a key role in the operation reliability of the whole DC distribution network. In order to meet the engineering needs of DC distribution network, a 10kV hybrid DC circuit breaker based on the coupling negative voltage principle is developed in this paper. Firstly, the topology and working principle of the DC circuit breaker are introduced. Furthermore, the design scheme of key components including fast mechanical switch, power electronic switch and coupling negative voltage device is given. Finally, a 10kV hybrid DC circuit breaker prototype is developed and tested. The results show that the 10kV hybrid DC circuit breaker can break 15kA short circuit current within 2ms, and has the characteristics of low loss and high reliability.

关键词： circuit breakers short-circuit currents DC distribution systems power distribution faults power distribution reliability

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