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检索条件"机构=Rail Transit Power Supply and Control Engineering Technology Research Center"

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Multi-scale Modeling and Simulation Method of Urban rail Traction power supply System for Digital Twin 5th

Multi-scale Modeling and Simulation Method of Urban Rail Tra...

引用

5th International Conference on Electrical engineering and Information Technologies for rail Transportation, EITRT 2021

作者： Chen, Lin Yu, Yi Gong, Zhaofeng Tang, Geng Wang, Yunda Zhang, Gang Power Supply Branch of Beijing Metro Operation Co. Ltd. Beijing100082 China Beijing Jiaotong University Beijing100044 China Rail Transit Electrical Engineering Technology Research Center Beijing100044 China

ISBN: (纸本)9789811699047

The actual operation of urban rail traction power supply system involves the energy change process under various time scales, such as low frequency, high frequency and instantaneous. However, the traditional modeling method adopts decentralized modeling and simulation at different time and structure scales, which splits the potential physical relations between different scale models, and lacks the overall description of the multi-scale physical change process. The accuracy and comprehensiveness of the results need to be improved. Therefore, a multi-scale digital twin modeling method for urban rail traction power supply system was proposed in this paper, and a hierarchical, componentized, and cross type multi-scale system modeling framework was designed. In order to solve the problem that the different time scale simulation is difficult to integrate, a multi-scale simulation method based on the model adaptive and parallel cooperation strategy was proposed, which can realize the organic and efficient integration between the multi-scale models. The simulation results show that the multi-scale digital twin modeling method can be used to observe the transient and steady state of the system in different time scales at the levels of devices, equipment and stations. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Digital devices

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Matching Characteristics of CTHP Circulation Systems 3

Matching Characteristics of CTHP Circulation Systems

引用

2023 3rd International Conference on Fluid and Chemical engineering, ICFCE 2023

作者： Zhao, Qi Gu, Shijie Ma, Shuang Liu, Lixin Liu, Zhe Shi, Yuntong Wu, Wende Liu, Xiaoyue Chang, Huinan School of Energy and Power Changchun Institute of Technology Changchun130012 China Construction Energy Supply and Indoor Environment Control Engineering Research Center of Jilin Province Changchun130012 China

Cogeneration can not only reduce the use of primary energy, but also reduce the pollution to the environment;the article selects a 1200kW low-pressure stage turbine as an example to give an analysis, calculates the variation of parameters such as heat production, heat production coefficient, flow rate of cold water and hot water of this turbine, and proposes and analyzes the circulation characteristics of the CTHP system, determines the matching relationship between the steam engine driven heat pump that the system needs to meet, and fits the relationship between the steam engine efficiency and power of the heat pump. The correlation equation of steam engine efficiency and power is regressed, and the relationship of circulating cooling water flow rate with turbine discharge temperature is fitted. It is found that the heat production performance coefficients of the high and low pressure stages of the heat pump increase by 27.6% and 29.3% respectively when the discharge temperature increases from 160°C to 220°C, and the system can realize better economic and social benefits compared with the conventional CHP system. © Published under licence by IOP Publishing Ltd.

关键词： Steam engines

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Battery SOC Estimation Method Based on BP Neural Network Optimized by Genetic Algorithm 1

引用

5th International Conference on Electrical engineering and Information Technologies for rail Transportation, EITRT 2021

作者： Ma, Xingyuan Liu, Yang Li, Chenxu Tang, Geng Zhang, Gang Qiu, Ruichang Power Supply Branch of Beijing Metro Operation Co. Ltd. Beijing100082 China Beijing Jiaotong University Beijing100044 China Rail Transit Electrical Engineering Technology Research Center Beijing100044 China

ISBN: (数字)9789811699139

ISBN: (纸本)9789811699122

The state of charge (SOC) of battery is an important indicator of battery condition assessment. Accurate SOC estimation can reflect the real-time capacity of battery and effectively extend the service life of battery. In this paper, aiming at the problem that the error function of BP neural network is easy to fall into local optimum and the effect of initial weight and threshold reverse iterative updating is limited, a neural network optimized by genetic algorithm is proposed to improve the estimation accuracy and global fast optimization. By studying the equivalent first-order RC model of the battery and building the simscape simulation model to simulate the charging and discharging process of the battery, the parameters of the battery terminal voltage, current, internal resistance, temperature and battery SOC are obtained. After the data is processed, the voltage, current, internal resistance and temperature are taken as the factors of battery SOC estimation. The experimental results show that the neural network optimized by genetic algorithm can obtain the optimal initial threshold and weight globally, thus establishing a high-precision SOC estimation model of battery, avoiding local optimization and improving the estimation accuracy of battery. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Genetic algorithms

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A Sensitivity Analysis-based Method For Optimal Allocation of High-capacity Dynamic Voltage Restorers in Radial Distribution Networks 5

A Sensitivity Analysis-based Method For Optimal Allocation o...

引用

5th International Conference on power engineering, ICPE 2024

作者： Zheng, Kangzhi Wang, Ling Tu, Chunming Xiao, Fan China Southern Power Grid Shantou Chaonan Power Supply Co. Ltd Shantou China Electric Power Research Institute of Guangdong Power Grid Co. Ltd Guangdong Provincial Key Laboratory of Electric Power Equipment Reliability Guangzhou China Hunan University National Electric Power Conversion and Control Engineering Technology Research Center Changsha China

ISBN: (纸本)9798331531140

Overloading some nodes in a complex radial distribution network can lead to serious voltage deviation problems. Configuring a large-capacity dynamic voltage restorer is an effective measure to solve the node voltage offset problem. This paper proposes an optimization method for configuring highcapacity dynamic voltage restorers based on sensitivity analysis, which can quickly and reasonably select the installation location and capacity of high-capacity dynamic voltage restorers in the distribution network. It can quickly solve the installation location and capacity of large-capacity dynamic voltage restorers. Considering the vertical and horizontal structure of the radial distribution network, a governance model that focuses on vertical governance is proposed and supplemented by horizontal governance. First, the sensitivity of the large-capacity dynamic voltage restorer is calculated for all nodes using sensitivity analysis methods. In this way, the installation position of the large-capacity dynamic voltage restorer is obtained. Second, the sum of the absolute values of the voltage offset at the nodes of the radial distribution network is taken as the objective function. Establish a large-capacity dynamic voltage restorer capacity-optimized model. Finally, the optimization model is solved by improving the particle swarm algorithm. A case study was conducted on a 41-node radial system. The simulation results verify the rationality and effectiveness of the proposed scheme. © 2024 IEEE.

关键词： Sensitivity analysis

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Design of lithium-ion battery management system for mine electric vehicle 6

Design of lithium-ion battery management system for mine ele...

引用

2021 6th International Symposium on Energy Science and Chemical engineering, ISESCE 2021

作者： Huang, Kaifeng Wang, Yong Feng, Juqiang National Engineering Technology Research Institute of Coal Mining Huainan China Engineering Technology Research Center of Rail Transit Power and Control Huainan Normal University Huainan China

With the continuous improvement on mine equipment automation level and the progress of battery manufacturing technology, Lithium-ion batteries are widely used in mining transportation, monitoring communication and emergency facilities. This paper designs a kind of lithium-ion battery management system for explosion-proof mining electric vehicle according to GB3836-20210 series standard. And the management system takes STM32F103 as the main controller and LTC6811 as the core, using passive equalization strategy to realize battery voltage equalization. The test results show that the maximum error of 100 batteries after equalization is 0.32v, the average error is 0.03v and the maximum error between the monitoring value and the measured value is 0.3v, the average error is 0.0019v, which prove that the management system has high accuracy and effectiveness. © Published under licence by IOP Publishing Ltd.

关键词： Lithium-ion batteries

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A High Adaptability Equivalent Algorithm for Wind Farm Based on Track Sensitivity

A High Adaptability Equivalent Algorithm for Wind Farm Based...

引用

2023 International Conference on power System technology, powerCon 2023

作者： Sun, Jieyi Hu, Jiahua Shen, Yangwu Xia, Zhongnan Ke, Deping Hao, Luxi Wang, Xiaoyuan Wu, Hong Zeng, Xiandong Ye, Jianxing Power Grid Technology Center State Grid Hunan Electric Power Company Limited Research Institute Changsha China Dispatching Control Center State Grid Hunan Electric Power Company Limited Changsha China Ctg Wuhan Science and Technology Innovation Park China Three Gorges Corporation Wuhan China School of Electrical Engineering and Automation Wuhan University Wuhan China Dispatching Control Center State Grid Shaoyang Power Supply Company Shaoyang China Dispatching Control Center State Grid Chenzhou Power Supply Company Chenzhou China

ISBN: (纸本)9798350300222

The integration of wind power into the power system is becoming increasingly evident as the installation of wind power continues to expand. Due to the inherent volatility and uncertain nature of renewable energy, accommodating large-scale wind power is a challenge, and the risks for safe and stable operation of the power system are also increasing, such as system oscillation caused by weak inertia. Considering that there are usually dozens or even hundreds of wind turbines in a wind farm, which leads to the high order wind farm models in the detailed modeling with complex coupling between wind turbines, an reasonable and effective equivalent model of wind farms is the basis for studying the oscillation mechanism, characteristics of power system. Therefore, this article proposes a high adaptability equivalent algorithm for wind farm based on track sensitivity and parameter identification. The simulation results show that the equivalence way proposed in this paper reflect the dynamic characteristics accurately of doubly fed wind farm grid points. © 2023 IEEE.

关键词： Wind turbines

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Coordinated and Optimized Scheduling of Integrated Energy System Based on Improved Beluga Algorithm 9th

Coordinated and Optimized Scheduling of Integrated Energy Sy...

引用

9th Purple Mountain Form on Smart Grid Protection and control, PMF 2024

作者： Zhang, Zhuanqin Wang, Hui Xiao, Jieping Zhou, Weichao Zhao, Zijun Guan, Baojin School of Electrical Engineering and Information Technology Changchun Institute of Technology Changchun130012 China National Local Joint Engineering Research Center for Smart Distribution Grid Measurement and Control with Safety Operation Technology Changchun130012 China State Grid Jilin Electric Power Co. Ltd. Yanbian Power Supply Company Yanbian133000 China Jilin Institute of Chemical Technology Jilin132022 China

ISBN: (纸本)9789819616701

In order to solve the problems of low energy utilization, high carbon emission and poor economic benefit of integrated energy system, this paper proposes an improved beluga algorithm to realize coordinated and optimal dispatching of integrated energy system. Firstly, the operation framework of the integrated energy system is built, and the two-stage electricity-to-gas model and carbon trading mechanism model were constructed. Secondly, the improved Moby Dick algorithm is used to optimize the comprehensive energy system. Finally, the matlab2021a+gurobi solution environment is used to verify the solution. The results show that the proposed algorithm can effectively improve the energy utilization rate of the system, while ensuring the low carbon and economy of the integrated energy system. © State Grid Electric power 2025.

关键词： Low emission

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research on equivalent ice thickness monitoring model of overhead transmission lines based on representative span 3

Research on equivalent ice thickness monitoring model of ove...

引用

2024 3rd International Conference on New Energy, Energy Storage and power engineering, NESP 2024

作者： Yin, Weihua Luo, Guocai Jian, Lingyun Liao, Tingjian Xiao, Qian Hunan Provincial Key Laboratory of Grids Operation and Control on Multi-Power Sources Area Shaoyang University Shaoyang422000 China Hunan Spec. Equipment Electric Energy Conversion and Control Engineering Technology Research Center Shaoyang University Shaoyang422000 China State Grid Hunan Province Electric Power Company Shaoyang Power Supply Branch Shaoyang422000 China

This paper aims to enhance the precision and efficiency of the calculation model for the equivalent icing thickness of tangent towers. The current calculation model for equivalent icing thickness of transmission lines lacks consideration of the influence of representative spans and controlled meteorological conditions. It also overlooks the impact of the concentrated load of the tension insulator string on the suspension shape of the conductor, as well as the compensatory capability of the suspension insulator string to counteract stress on the overhead transmission lines when deflected, resulting in calculation deviations. To resolve these issues, this paper investigates the dynamic characteristics of transmission line parameters and proposes a calculation model for equivalent icing thickness based on the representative span. The improved model demonstrates enhanced efficiency and accuracy in measuring the equivalent icing thickness for on-line icing-monitoring of transmission lines. Experimental results confirm a reduction in relative error compared to reference values, with the relative error gradually decreasing as ice thickness increases, indicating enhanced accuracy. The efficacy of this model is substantiated through experiments, offering a more efficient and precise method for monitoring ice thickness in engineering applications. © Published under licence by IOP Publishing Ltd.

关键词： Ice

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research on detection and protection technology of DC residual current 3

Research on detection and protection technology of DC residu...

引用

2024 3rd International Conference on power System and Energy technology, ICPSET 2024

作者： Yang, Ruixiong Chen, Yong Xu, Kai Gao, Shuping Guangdong Power Grid Co. Ltd. DC Distribution Power Research Center Guangdong Zhuhai519000 China College of Electrical and Control Engineering Xi’an University of Science and Technology Shaanxi Xi’an710600 China Xi’an Key Laboratory of Electrical Equipment Condition Monitoring and Power Supply Security Shaanxi Xi’an710600 China

To realize that the residual current device can accurately and quickly detect the fault when the fluctuating DC residual current occurs in the system and improve the system’s safety, a DC residual current detection and protection method based on VMD was proposed. Particle Swarm Optimization (PSO) was used to optimize the penalty factor and the number of decomposition layers of VMD. The minimum envelope entropy of the residual current signal is used as the fitness function to obtain the optimal combination. The criterion of fault occurrence is established based on the optimal modal component mutation characteristic of the residual current decomposed by VMD. Experiments show that this method can identify faults quickly and effectively when pulsating DC residual current is generated in the system. © 2024 Institute of Physics Publishing. All rights reserved.

关键词： Particle swarm optimization (PSO)

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research on Grid Connection control Strategy of Building Energy Router Based on Pre Synchronous VSG control technology 1

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8th Purple Mountain Forum on Smart Grid Protection and control, PMF 2023

作者： Guan, Baojin Wang, Hui Zhang, Xiaohua Yin, Pan Meng, Xiangping Safe Operation of Smart Distribution Network of the Measurement and Control Joint Engineering Research Center Changchun Institute of Technology Changchun Jilin130012 China State Grid Jilin Electric Power Co. Ltd. Yanbian Power Supply Company Jilin Yanji130012 China Jilin Institute of Chemical Technology Jinlin Jilin130012 China

ISBN: (数字)9789819992515

ISBN: (纸本)9789819992508

Aiming at the problem of unstable DC bus connection in building energy routers, this paper proposes a grid connection control strategy for building energy routers based on pre-synchronous virtual synchronous generator (VSG) control technology. Firstly, an energy router topology is designed, and secondly, the pre-synchronous VSG is analyzed. Pre-synchronous VSG control is adopted for the DC bus connection in the energy router to maintain the stability of the system and reduce the voltage and current impact of the common coupling point. In this paper, the simulation model of pre-synchronous VSG control energy router connected to the grid is established by MATLAB/simulink. In MATLAB, simulation results show that the pre-synchronous virtual synchronous machine (VSG) control has the characteristics of small overshoot. The proposed control strategy proposes a new solution for the grid-connected operation of energy routers. © 2024, State Grid Electric power.

关键词： MATLAB

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