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Multi-parameter load sensing pump model simulation and flow rate characteristics research

Chinese Journal of Aeronautics 2022年第12期35卷 296-308页

作者： ZongXia JIAO Zhenyu WANG Xiaochao LIU HuJiang WANG Pengyuan QI Weizhi QIAO School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Research Institute for Frontier Science Beihang UniversityBeijing100083China Science and Technology on Aircraft Control Laboratory Beihang UniversityBeijing 100083China Science and Technology on Vehicle Transmission Laboratory China North Vehicle Research InstituteBeijing 100072China Ningbo Institute of Technology Beihang UniversityNingbo 315800China

Load sensing pumps have been widely used in diverse hydraulic *** show that structural parameters have undeniable impacts on the characteristics and efficiency of the load sensing *** main purpose of this article is to study the influence of load sensing pump structure parameters on flow *** the present study,a nonlinear multi-parameter model is proposed for this type of *** this model,different parameters,including spool clearance,spool covering amount,internal leakage are considered to reflect the displacement adjustment process of the load sensing ***,a frequency sweep method is proposed to analyze the frequency domain of the nonlinear mathematical *** experiment rig was built to study the influence of key structural parameters on the dynamic follow-up characteristics of the pump *** obtained results show that the diameter of the orifice d can significantly affect the working characteristics of the *** is found that a large diameter of the orifice d can improve the phase following ability of the system,while a small diameter of the orifice d can reduce the bypass flow rate and increase the amplitude following *** paper provides a new consideration to study the dynamic follow-up characteristics of the load sensing pump.

关键词： Flow rate characteristics Frequency analysis Hydraulic Load sensing pump Nonlinear

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Non-Iterative Solution for Coordinated Optimal Dispatch via Equivalent Projection-Part I: Theory

arXiv

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arXiv 2023年

作者： Tan, Zhenfei Yan, Zheng Zhong, Haiwang Xia, Qing The Key Laboratory of Control of Power Transmission and Conversion Shanghai Jiao Tong University Ministry of Education Shanghai200240 China The State Key Laboratory of Power Systems the Department of Electrical Engineering Tsinghua University Beijing100084 China

Coordinated optimal dispatch is of utmost importance for the efficient and secure operation of hierarchically structured power systems. Conventional coordinated optimization methods, such as the Lagrangian relaxation and Benders decomposition, require iterative information exchange among subsystems. Iterative coordination methods have drawbacks including slow convergence, risk of oscillation and divergence, and incapability of multi-level optimization problems. To this end, this paper aims at the non-iterative coordinated optimization method for hierarchical power systems. The theory of the equivalent projection (EP) is proposed, which makes external equivalence of the optimal dispatch model of the subsystem. Based on the EP theory, a coordinated optimization framework is developed, where each subsystem submits the EP model as a substitute for its original model to participate in the cross-system coordination. The proposed coordination framework is proven to guarantee the same optimality as the joint optimization, with additional benefits of avoiding iterative information exchange, protecting privacy, compatibility with practical dispatch scheme, and capability of multi-level problems. Copyright © 2023, The Authors. All rights reserved.

关键词： Iterative methods

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Non-Iterative Solution for Coordinated Optimal Dispatch via Equivalent Projection-Part II: Method and Applications

arXiv

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arXiv 2023年

This two-part paper develops a non-iterative coordinated optimal dispatch framework, i.e., free of iterative information exchange, via the innovation of the equivalent projection (EP) theory. The EP eliminates internal variables from technical and economic operation constraints of the subsystem and obtains an equivalent model with reduced scale, which is the key to the non-iterative coordinated optimization. In Part II of this paper, a novel projection algorithm with the explicit error guarantee measured by the Hausdorff distance is proposed, which characterizes the EP model by the convex hull of its vertices. This algorithm is proven to yield a conservative approximation within the prespecified error tolerance and can obtain the exact EP model if the error tolerance is set to zero, which provides flexibility to balance the computation accuracy and effort. Applications of the EP-based coordinated dispatch are demonstrated based on the multi-area coordination and transmission-distribution coordination. Case studies with a wide range of system scales verify the superiority of the proposed projection algorithm in terms of computational efficiency and scalability, and validate the effectiveness of the EP-based coordinated dispatch in comparison with the joint optimization. Copyright © 2023, The Authors. All rights reserved.

关键词： Computational efficiency

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Wind power Generation Capacity Evaluation Based on Correlation Analysis of Adjacent Wind Farms

Wind Power Generation Capacity Evaluation Based on Correlati...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Sun, Shuxin Qiao, Ying Lu, Zongxiang Ma, Yanhong Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Beijing100084 China State Grid Gansu Electric Power Company Wind Power Technology Center Lanzhou730050 China

ISBN: (纸本)9781665414395

Accurate assessment of the power generation capacity of the wind farm is the key basis for incorporating it into power system scheduling and other optimizing operation activities. Traditional evaluation methods, such as benchmarking wind turbine method, have higher requirements for input data, but many wind farms in operation for many years are difficult to meet such data conditions. A new power generation capacity evaluation method based on correlation analysis of adjacent wind farms is proposed in this paper. Meteorological data and power of adjacent wind farms are used as replaced input data based on correlation analysis between the target farm with its adjacent farms. First, anticipate wind speed data and then construct the wind power curve with three different neural networks to evaluate power generation capacity. Afterwards, adjacent wind farms are used as data sources to fit the power data of the target wind farm with the application of influence radius method, inverse square distance method and bilinear interpolation method. Finally, combined with data in the actual case, investigate the advantages and disadvantages of different methods in the evaluation of power generation capacity. © 2021 IEEE.

关键词： Time delay

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Review and Reflection on New Energy Participating in Electricity Spot Market Mechanism

Review and Reflection on New Energy Participating in Electri...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Wang, Xiangyan Peng, Peipei Chen, Ning China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Nanjing210003 China

ISBN: (纸本)9781665414395

In the context of global energy transition, China's new energy sources continue to develop rapidly, and the new round of electricity reform puts forward important requirements on how to design reasonable mechanisms to promote the consumption of new energy sources. This paper compares and summarizes the market mechanisms for promoting new energy consumption in mature foreign electricity spot markets, such as those in the United states, Australia and Northern Europe. Then it introduces the characteristics of the construction of electricity spot markets and related mechanisms for promoting new energy consumption in eight pilot provinces in China. By comparing the current situation of the development of spot markets for new energy participation at home and abroad, and combining the challenges faced by the construction of domestic electricity spot markets at present, suggestions are made to promote the construction of markets for new energy consumption in China. © 2021 IEEE.

关键词： Energy utilization

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Research on time series data of renewable energy output based on ga-lstm model of multi-source data fusion

Research on time series data of renewable energy output base...

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2021 International Conference on power System Technology, powerCON 2021

作者： Ma, Jiong Liu, Yanzhang Chen, Ning Zhang, Lei Sun, Bo China Electric Power Research Institute State Key Laboratory of Operation and Control of Renewable Energy Storage Systems Beijing100192 China

ISBN: (纸本)9781665407373

The analysis and research of time series output data of new energy stroke power is of great significance. By analyzing the time series data of wind power, this paper forecasts the wind power, and proposes a short-term wind power prediction method based on long-term and short-term memory deep learning model based on multi-source data. Then the weight of LSTM network is optimized by genetic algorithm to improve the prediction accuracy of the overall model. The model is verified based on the real historical data of new energy power stations. Results show that the prediction model proposed in this paper has higher prediction accuracy than the traditional time series prediction methods. © 2021 IEEE.

关键词： Genetic algorithms

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Refined power modeling method of ultra-short-term wind power cluster based on power reverse deduction

Refined power modeling method of ultra-short-term wind power...

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

作者： Yupeng Sun Mao Yang Chenglian Ma Yunpeng Jia Guozhong Fang Key Laboratory of Modern Power System Simulation and Control & Renewable EnergyTechnology Ministry of Education Northeast Electric Power University Jilin China Northeast Electric Power University Jilin China Jilin Power Supply Company of State Grid Jilin Electric Power Co. Ltd. Jilin China State Grid Northeast China Branch Shenyang China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

The accurate prediction of wind power provides a guarantee for the safety and stability of the power system and the power market trading. The existing wind power prediction methods mainly focus on the depth of the model, and improve the accuracy of the prediction by constantly improving the model and deepening the model, but they ignore the limitations of the model itself. In this paper, a fine modeling method for wind power is proposed, and the prediction accuracy is improved by horizontal expansion of the model. Firstly, the power output class and its NWP characteristics are determined by power reverse deduction, and the power output class is divided by the degraded and simplified U-net model. Then, Non-stationary Transformer (NSTransformer) is introduced to model each output level separately to get the predicted power. Finally, the proposed method is applied to a wind farm cluster in China. The accuracy of the proposed method is higher than other methods in ultra-short-term prediction, which proves the reliability and effectiveness of the proposed method.

关键词： Accuracy System integration Predictive models Wind power generation power system stability Wind farms Transformers Stability analysis Safety Thermal stability

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Review on recent progress in on-line monitoring technology for atmospheric pollution source emissions in China

引用

Journal of Environmental Sciences 2023年第1期123卷 367-386页

作者： Huanqin Wang Jitong Zhou Xue Li Qiang Ling Hongyuan Wei Lei Gao Ying He Ming Zhu Xiao Xiao Youjiang Liu Shan Li Chilai Chen Guotao Duan Zhimin Peng Peili Zhou Yufeng Duan Jianbing Wang Tongzhu Yu Yixin Yang Jiguang Wang Zhen Zhou Huaqiao Gui Yanjun Ding State Key Laboratory of Transducer Technology Institute of Intelligent MachinesHefei Institutes of Physical ScienceChinese Academy of SciencesHefei 230031China Institute of Mass Spectrometry and Atmospheric Environment Jinan UniversityGuangzhou 510632China Department of Automation University of Science and Technology of ChinaHefei 230027China China Automotive Technology and Research Center Tianjin 300300China Institute of Solid State Physics Chinese Academy of SciencesHefei 230031China Key Laboratory of Environmental Optics and Technology Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031China School of Electronic Information and Communications Huazhong University of Science and TechnologyWuhan 430074China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China State Key Laboratory of Power Systems Department of Energy and Power EngineeringTsinghua UniversityBeijing 100084China Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education School of Energy and EnvironmentSoutheast UniversityNanjing 210096China School of Chemical and Environmental Engineering China University of Mining and Technology(Beijing)Beijing 100083China CAS Center for Excellence in Regional Atmospheric Environment Institute of Urban EnvironmentChinese Academy of SciencesXiamen 361021China

Emissions from mobile sources and stationary sources contribute to atmospheric pollution in China,and its components,which include ultrafine particles(UFPs),volatile organic compounds(VOCs),and other reactive gases,such as NH3and NOx,are the most harmful to human *** has released various regulations and standards to address pollution from mobile and stationary ***,it is urgent to develop online monitoring technology for atmospheric pollution source *** study provides an overview of the main progress in mobile and stationary source monitoring technology in China and describes the comprehensive application of some typical instruments in vital areas in recent *** instruments have been applied to monitor emissions from motor vehicles,ships,airports,the chemical industry,and electric power *** only has the level of atmospheric environment monitoring technology and equipment been improving,but relevant regulations and standards have also been constantly ***,the developed instruments can provide scientific assistance for the successful implementation of *** to the potential problem areas in atmospheric pollution in China,some research hotspots and future trends of atmospheric online monitoring technology are ***,more advanced atmospheric online monitoring technology will contribute to a comprehensive understanding of atmospheric pollution and improve environmental monitoring capacity.

关键词： Atmospheric pollution Mobile sources Stationary sources On-line monitoring technology

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RENEWABLE ENERGY TIME-SERIES PRODUCTION simulation METHOD CONSIDERING PUMPED-STORAGE 10

RENEWABLE ENERGY TIME-SERIES PRODUCTION SIMULATION METHOD CO...

引用

10th Renewable power Generation Conference, RPG 2021

作者： Meng, Na Li, Xiaofei Wang, Shuai Zhang, Jinping State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing100192 China

ISBN: (纸本)9781839536069

With the increasing proportion of renewable energy power generation, the volatility of renewable energy power generation output puts higher requirements on the power system operation and regulation capability. Pumped-storage is an effective means to improve the flexibility of system operation and promote the accommodation of renewable energy. Affected by the uncertainty of renewable energy power output and energy storage capacity, the power limitations of pumped-storage, accurate quantification of the effect of pumped-storage in promoting renewable energy accommodation requires time-series simulation calculations. This paper studies the mechanism of pumped-storage to promote renewable energy accommodation. Pumped-storage can directly or indirectly increase the accommodation space of renewable energy by energy storage, providing spinning reserve and peak regulation. Based on the above research results, a time-series simulation model of renewable energy accommodation capacity considering pumped-storage was constructed. A case analysis of the model based on actual operating data verifies that the proposed method can realize the quantitative calculation of the pumped-storage to promote the accommodation of renewable energy. © The Institution of Engineering and Technology.

关键词： Renewable energy resources

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Time Synchronization in Industrial Internet of Things: A Survey

Time Synchronization in Industrial Internet of Things: A Sur...

引用

IEEE Information Technology, Networking, Electronic and Automation control Conference

作者： Ke Zhou Xiaoming Wang Shijie Cui Electric Power Research Institute of Guangxi Power Grid Co. Ltd. Nanning China State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Key Laboratory of Networked Control Systems Chinese Academy of Sciences Liaoning China

ISBN: (数字)9798350370805

ISBN: (纸本)9798350370812

Time synchronization is a fundamental strategy for many operations such as data synchronous collection, timely fault tracking, distributed control, and real-time communication in Industrial Internet of Things (IIoT). Over the years, a wide variety of protocols and technologies have been proposed for different application scenarios. The accuracy, security, robustness, low cost, and so on, are the main focus for the design of time synchronization protocol. However, so far, there is no relatively unified standard for time synchronization in IIoT. To clarify the development of time synchronization technology, this paper surveys the latest research for time synchronization in various types of networks including Precision Time Protocol and wireless sensor networks. The future development of time synchronization in IIoT is also investigated.

关键词： Surveys Wireless sensor networks Protocols Accuracy Reviews Robustness Synchronization Security Standards Industrial Internet of Things

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