bluuebunny/crossref_metadata_2025 huggingface dataset:
A method of battery capacity prediction based on fuzzy logic and Neural networks
Authors: He Tingting , Xu Zhipeng , Xie Qi , Cheng Shan , Zhang Sheng
Published: September 2020

With the wide use of lithium battery, its online monitoring and residual capacity prediction have been paid much attention. There are two methods for predicting the residual capacity of lithium batteries, namely model method and data-driven method. The traditional model method requires in-depth understanding of the material characteristics and aging mechanism of the battery. However, it is difficult to establish an accurate model due to the complex electrochemical reactions in the battery and the vulnerability to external factors. The data-driven law has been applied more widely because of its good applicability and flexibility. This paper presents a method of battery capacity prediction based on fuzzy logic and neural networks. The lithium battery data published by PCoE are selected for the test, and the results show that the prediction error of the method for the residual capacity of single battery is less than 2%, which indicates that the method has a good applicability for the complex nonlinear system of lithium battery pack, and can obtain accurate battery capacity prediction value, and it has a good application prospect.
Hybrid Loss Minimization Control For Dual Three-phase Linear Induction Motor
Authors: Liu Xiaohu , Zhao Jinghong , Zhou Yangwei
Published: September 2020

Dual three-phase linear induction motor has harmonic losses that cannot be included in the loss-flux model in the z1-z2 subspace obtained by the generalized Clarke transform. The loss model of α-β subspace is not optimal for obtaining the reference flux. To solve this problem, losses in harmonic subspace was analyzed, and then a hybrid loss minimization control strategy was proposed. Based on the loss model that considers the end effect in the d-q subspace (transformed from α-β subspace), suboptimal flux linkage calculated by the model is set as the starting point of search controller, and optimal operating point could be obtained. Finally, the simulation results show that the strategy has better response performance than the traditional search method, and there is a certain loss reduction under various working conditions, especially at light load (0.2pu, 5 m/s), there is about 48.2% loss reduction.
Research On Technology Development Status and Trend Analysis Of New Energy Vehicle
Authors: Ye Chao , Xu Huawei , Hu Jianyao , Peng Qi , Yang Lin
Published: September 2020

In recent years, with the high awareness of the Chinese government on environmental protection, and support to the development of new energy, new energy vehicles have got developed to a certain extent and have grown into a new field where engineering machinery and new energy are closely integrated. Compared with fuel vehicles, new energy vehicles have great advantages in terms of environmental protection, the only disadvantage is that the engine’s power and stability still need to be discussed in depth. Based on the analysis of new energy vehicle development technology in china, this article will further study on the development trend and key research directions of new energy vehicle technology.
Test Bench Construction and Verification for Static Magnetic Coupling Wireless Power Transfer Systems
Authors: Zhang Baoqiang , Kong Zhiguo , Li Chuan , Li Jin , Wang Zhaohui , Zhao Lingxiao
Published: September 2020

In this paper, a test bench construction and verification scheme for static magnetic coupling wireless power transfer (WPT) systems is introduced, including test indices, test bench construction, test procedure, a test bench prototype and a specific test case. Firstly, a brief introduction to the working principle of the static magnetic coupling WPT systems is presented. Secondly, by interpreting the existing WPT systems test standards, the indices and test methods of the performance for WPT systems are given. Finally, the test procedure developed above is demonstrated by construction of an automatic test bench for WPT systems and a specific test case. In a word, the test bench shown in this paper can better complete the testing of various important indices of WPT systems, and it has certain guidance and reference significance for the construction and improvement of the subsequent bench.
Short-term planning and design of wind power base based on MATLAB power flow calculation method
Authors: Zhang Fei , Sun Xiaohui , Xi Jia , Guo Zimeng
Published: September 2020

At present, wind power generation technology is an environmentally friendly, mature technology, low cost and scale-efficient green technology. It is also the fastest growing new energy power generation technology form. The main research of this paper is to consider the spatial and temporal characteristics of wind resources, select a wind farm development combination, build a wind farm, and connect wind power to the grid through large-scale centralized development and long-distance high voltage. The experimental model used in this paper is an IEEE-57 node system. In MATLAB, the power flow calculation method is used to study and analyze the access point combination of the grid connection and the line expansion scheme after the grid connection.
Research on Onshore Power Supply System in Port for Ships
Authors: Li Kun , Du Ke
Published: September 2020

Due to various ship types, the shipboard devices which receive the shore power are varying. To ensure the safety of equipment and personnel in onshore power system (OPS) operation process during ship berthing at port, the global standards for the process of providing shoreside electrical power to a ship at berth is in high demand to be formulated. In this paper, the background of the OPS formulating, the composition of the OPS and existing problems when ship connect with the OPS are discussed firstly. Then, possible solutions have been proposed to determine the main content of the guideline. Finally, the significance of the guideline and the suggestion for the OPS development are given.
Research and Analysis of Nonlinear Predictive Model Identification Control Based on Pumped Storage Unit in Construction Site
Authors: Gou Xiaoping , Zhang Wanjun , Zhang Feng , Zhang Jingxuan , Zhang Jingyi , Zhang Jingyan
Published: September 2020

In this paper, a generalized predictive control method for the speed control system of pumped storage units is proposed, which is suitable for different working conditions of the power generation direction of pumped storage units. Through a combination of mechanism modeling and data-driven model order and parameter reduction strategy to determine the time delay and order of the instantaneous linear prediction model of the speed control system of pumped storage unit. According to the operation state and control target of the unit, the design scheme of the generalized predictive control frequency regulation mode and the opening regulation mode are given respectively, and the dynamic analysis of the control process under different operation conditions is carried out according to the actual parameters of the speed regulation system of a single 300MW pumped storage unit of a pumped storage power station in Central China, which verifies the effectiveness of the control method.
Discussion on the application of energy microgrid integrated with blockchain technology
Authors: Zhou Yuangao
Published: September 2020

Based on the technical characteristics of the blockchain, the credibility, fit, architecture, and main business models of the data processing of the energy microgrid integrated with the blockchain technology are analyzed and discussed. It shows the feasibility and necessity of implementation, and puts forward a targeted solution to the current situation. Blockchain is very promising to promote the development of energy microgrid.
Crosstalk Analysis and Suppression of GaN Driving Circuit in Bridge Converter
Authors: Zhou Yang , Yang Li , Gong Xiang
Published: September 2020

Enhancement mode Gallium-Nitride power transistors (GaN HEMT) have emerged as promising devices for high frequency, high efficiency and high power density switch m ode power supplies. However, when GaN device works in high frequency, the dv/dt and di/dt slopes are increased due to stray inductances and parasitic capacitances, which leads to oscillations and overshoots in gate-source voltage and affect the stability of driving circuits. Especially in the phase-bridge circuit, the crosstalk between the upper and lower switch seriously limits the performance of the device. In order to solve the short circuit problem of bridge arms generated by oscillation and crosstalk, an improved design of gate driving circuit was proposed, which could eliminate the parasitic oscillation and voltage spikes, suppress crosstalk and higher harmonics effectively. In addition, A double pulse test prototype is built and the simulation and experimental results verify the effectiveness of this driving circuit.
Study of A 28-GHz Tree-shaped Fractal Millimeter Wave Antenna
Authors: Li Wenpe , He Wei , Lai Zhongrong , Liu Siyu
Published: September 2020

In this study, a tree-shaped fractal antenna is designed. The antenna uses a finite ground plane with a rectangular structure. By increasing the number of iterations of the tree fractal structure, optimizing the size of the priority ground plane and the size of the dielectric substrate, the antenna can obtain good impedance matching. And through electromagnetic simulation of HFSS. The antenna’s working frequency band is 26GHz-30.2GHz (relative bandwidth is 15%), and the maximum gain is 4.72dB at the center frequency of 28GHz, which can be used for future 5G communication.
Research on interconnection power system Construction of traditional energy Control Structure
Authors: Liu Min , Zhang Yanxi , Yan Dongwen
Published: September 2020

With the increasing proportion of new energy in the power system energy. It has become an inevitable trend for new energy grid connected to participate in power system frequency modulation. As the representative energy of new energy, wind power has become the research focus of frequency modulation with traditional energy in recent years. In order to realize the frequency stability of power system, the load frequency control technology is used for power system frequency modulation at this stage. That is to say, in the case of any load disturbance, the power system can realize the load disturbance following the random change of power generation, so as to maintain the frequency deviation within a allowable range (±0.2Hz). Based on this purpose, this design starts from the load frequency control model of conventional units, and first does not consider the role of wind power to build the control structure of traditional energy. In order to facilitate the study of the design of traditional energy units are selected thermal power units. Starting from the establishment of power system frequency response model, we can understand the composition of traditional energy power system frequency response model and the structural characteristics of multi regional interconnected power system. The characteristics of load frequency control module of governor, turbine, generator, load and other basic conventional units are analyzed, and the related transfer function is listed. After the completion of the basic module, the mathematical model of traditional energy single area and traditional energy two areas is built. At the same time, when considering the construction of two regional interconnected thermal power units, we should also pay attention to the characteristic analysis of tie line power and regional control deviation.
Energy Efficiency Evaluation Method of Customer-side Integrated Energy System
Authors: Wang Hongyan , Liu Qian , Niu Ze
Published: September 2020

At present, the integrated energy efficiency evaluation (EEE) system based on subsystems is not yet mature. Combining the characteristics of modularization and decentralization of the integrated energy system (IES), based on the membership function of fuzzy theory and the AHP method, this paper constructs a set of customer-side comprehensive EEE system, which covering all kinds of energy sources including electricity, gas, cooling, heat, water and so on. On this basis, the method of comprehensive energy efficiency evaluation index (EEEI) based on subsystem is summarized which can meet the requirements of breadth and depth of comprehensive EEE and provide decision basis for system design and operation.
Research on Application of Three-Dimensional Design Standardization and Three-Dimensional Design Review Method for Transmission and Transformation Project
Authors: Lan Feng , Lu Fumu , Qiu Xuanyu
Published: September 2020

This paper systematically introduces a three-dimensional transmission and transformation engineering auxiliary design software, and analyses its function, structure and technical characteristics. The main feature of this software is that it has a relatively powerful three-dimensional auxiliary design capability, which can help designers quickly generate a three-dimensional model of power transmission and transformation projects. The three-dimensional model can not only give the project investor an overall image and visual effect of the project during the design bidding stage, but also serve as a reference for the design of the relevant drawings in the later period. At the same time, after having an accurate model, the designer can verify the correctness and reliability of the design, can directly obtain some spatial information, and can dynamically modify, adjust and verify the model as needed. The software also provides related information statistics, query, modification, retrieval and other functions, and provides corresponding drawing management tools according to drawing management specifications. (With the actual application of the system, the design level and technical capabilities of designers will be further improved to ensure that the design work can be completed with high quality and efficiency.
Research on General Model System for Three-Dimensional Design of Transmission and Transformation Project Under Smart Grid Modeling Standards
Authors: Zhang Shengxi , Lan Feng , Li Caihong
Published: September 2020

The traditional design method of power transmission and transformation project based on knowledge model has the problems of rough construction quality and low economic benefit of power transmission and transformation project. Therefore, the design method of power transmission and transformation engineering based on three-dimensional digital intelligent technology is proposed, and the working mode of intelligent power transmission and transformation engineering is designed. Based on this working mode, a three-dimensional collaborative design process for power transmission and transformation engineering is obtained. The design platform is built to shorten the design cycle of power transmission and transformation projects, so that the efficiency of power transmission and transformation engineering design is greatly improved. Through the digital handover of the three-dimensional collaborative database, the transmission and transformation engineering information is sorted and sorted, so that multiple people can view and modify the information at the same time, and the three-dimensional verification process of the transmission and transformation project is designed to achieve a safe distance and collision to the transmission and transformation project. Testing to improve the accuracy of engineering design. Experimental results show that the proposed method can improve the design efficiency and quality of power transmission and transformation projects, and has a higher social and economic evaluation effect.
Research on Echelon Utilization of Lithium Battery
Authors: Li Zehan , Yin Kun , Liu Zhenxing , Song Jialiang , Chen Zhongkai
Published: September 2020

This thesis finds a form of cascade use for retired lithium batteries by analysis, tests, screens and reorganizes retired lithium batteries into new standard energy storage modules, which are successfully applied to stadium scooters. The results show that this form can effectively extend the life cycle of lithium batteries.
Application of improved GM (1, m) model for transformer faults prediction
Authors: Chen Guoping , Shi Yujie , She Haizhi , Qin Yanjun , Zhou Xiaohong , Qi Zhengdong , Guo Wenke
Published: September 2020

The traditional GM (1, m) prediction model is improved, the original data sequence is transformed, and its data generation method is changed, so that the transformed data sequence has a more approximate exponential change property, which meets the gray model’s smoothness Requirements, to be able to predict fluctuation series. At the same time, in order to improve the prediction accuracy of the model, the model background value is optimized, so that the prediction accuracy of the model is greatly improved. The improved GM (1,7) prediction model is used to predict the volume fraction of various gas characteristics of the transformer. Compared with the traditional GM (1,1) and GM (1,7) prediction results, it has a good approximation to the original data sequence the effect shows the effectiveness of the model.
Research Review of Flywheel Energy Storage Technology
Authors: Jing Lili , Xue Xiaochuan , Guo Xiaoxia
Published: September 2020

to study the flywheel energy storage technology, a great number of papers about the researches on and development of high-speed flywheel energy storage system in China and overseas were reviewed and summarized. The technology started early in foreign countries. It developed rapidly and has formed a certain series of products today, while in China, the research on this technology is quite laggard and still in the experimenting stage. Now there is no flywheel energy storage product which can be applied in practice in quantity. Therefore, the research on a new type of efficient and low power consumption energy storage flywheel is of great value and significance today.
Research on Foundation Type Selection of Overhead Transmission Lines under Different Environmental Conditions
Authors: Gan Jingshuang , Li Lingyun
Published: September 2020

The foundation engineering is an important part of the transmission line engineering system, which has an direct impact on the safe operation of the line project. According to different topography and geological conditions, this article draws a conclusion of foundation type that are more in line with technical conditions and actual conditions under different environmental conditions through comparing and studying various applicable foundations. It aims to provide certain reference significance for the selection of transmission line foundations.
Benefit evaluation of pumped storage power station in electricity marketization environment
Authors: Huang Xiaoying , Wang Qingran , Wu Haoyu , Yang Yong , Xu Delong , Li Xuejiao , Jiang Weihai , Li Bo
Published: September 2020

At present, pumped storage power station based on two-part system electricity price cannot effectively recover the cost in China, so it has become one of the development directions for the pumped storage power station to enter the electricity market and obtain benefits. Combined with the background of electricity marketization, this paper analyses the benefits of pumped storage energy in electricity market from two aspects: the electric energy market and the auxiliary service market, based on the functions of peak load shifting, peak-regulating, frequency modulation and phase modulation provided by pumped storage power stations. Efficiency analysis based on pump storage power station, an economic benefit, environmental benefit and social benefit for the primary index is established under electricity market environment benefit evaluation system of pumped storage power station, based on the G1 - benefit evaluation model of entropy weight method, taking Tongbai pumped storage power station as an example to carry on the comprehensive evaluation, the evaluating model is verified to have been put into production of pump storage power station in power market yield were analysed, and it provides the direction for future development of China pump storage power station is proposed.
Research on the Technical Reliability of the Overhead Transmission Lines Based on the Life Cycle Technology
Authors: Gan Jingshuang , Li Lingyun
Published: September 2020

Based on the actual operating conditions of overhead transmission line, the safety and reliability of overhead transmission line is researched using the life cycle technology. Taking a 220kV overhead transmission line as an example, various parameters at different life stages are measured and analyzed, and finally the technical scheme most conducive to ensuring safe and reliable operation of the overhead transmission line is obtained. The research results provide a reference for the power company to ensure the safety of the power system operation and stimulate the innovation of power technology.
Sensitivity comparison of impedance sensors with different coil arrangements
Authors: Ma Laihao , Zhang Hongpeng , Zeng Lin , Shi Haotian , Bai Chenzhao , Zhao Xupeng
Published: September 2020

Two inductance-capacitance dual mode sensors based on different arrangement of dual coil and microchannel for oil multi-contaminant detection are proposed. The inductance detection model of metal particles and capacitance detection model of non-metal particles are constructed theoretically. The experimental results show that the two dual mode sensors both can realize inductance detection of iron and copper particles and capacitance detection of water droplets and air bubbles in oil. The detection sensitivity can be effectively improved by placing the microchannel on the edge of coil inner hole. The sensor of dual coils perpendicular to microchannel has more sensitive in inductance detection and the sensor of dual coils parallel to microchannel has more sensitive in capacitance detection. This research is helpful to improve the design and sensitivity of oil multi-contaminant detection sensor, and is of great significance to the realization of health monitoring and fault diagnosis of machinery.
The review of the degradation mechanism of the catalyst layer of membrane electrode assembly in the proton exchange membrane fuel cell
Authors: Xu Ke , Zhao Xueying , Hu Xiao , Guo Zhiyuan , Ye Qing , Li Lu , Song Jie , Song Pengxiang
Published: September 2020

With the rapid depletion of fossil reserves, unstable prices of fossil commodities and the negative effect of fossil fuel on the environment, the demand for clean energy power generation increases. Proton exchange membrane (PEM) fuel cells are a prominent technology for power generation in a variety of applications such as fuel cell vehicles, portable power supplies, stationary power stations and submarines. With their high power density, low emission, low operating temperature, high efficiency, noiseless operation and simplicity of design and operation, PEM fuel cells have a number of attractive advantages over traditional power sources. In this paper, the degradation mechanism of the catalyst layer of the membrane electrode assembly and the core component of the proton exchange membrane fuel cell are summarized. Besides, the degradation mechanism of the Pt-based catalyst, carbon support and Nafion ionomer are obtained. Considering the agglomeration and growth of Pt catalyst, Pt loss and migration, active site pollution and other micro processes, the degradation of catalyst is analyzed in depth. Furthermore, the carbon corrosion process is studied under the normal operation, fuel starvation of the anode and partial hydrogen coverage of the anode processes. In addition, the chemical degradation of Nafion ionomer and the effect of the length of the side chain to the electrode structure are discussed. Eventually, the improved strategies for the failure of the catalyst layer of the membrane electrode assembly are proposed, in the hope to provide useful guidance for the development of long-life proton exchange membrane fuel cells in commercialization.
Research on Green Logistics Energy-Saving and Emission-Reduction Vehicle Distribution System under Low Carbon Economy
Authors: Cao Boyang
Published: September 2020

Logistics is called “the source of the third profit”, and it has attracted more and more attention from people, and it has increasingly become the basic industry of the national economy. Distribution is a special and comprehensive form of activity in the logistics system, which is a close combination of logistics and business flow. Distribution is the process of allocating goods at the distribution center or other logistics nodes according to the requirements of the customer and handing them to the customer in the most reasonable way. After the economic work conference of the 18th National Congress of the Communist Party of China, the government and enterprises put green and low carbon in a more important position, and industries such as urban construction and traditional manufacturing need to think about how to become greener, especially for the logistics and transportation industry. Based on this research background, the paper developed an intelligent vehicle scheduling system. Based on the summarization of a large number of applications at home and abroad, from the two aspects of the vehicle routing problem model and solution algorithm, the domestic and foreign research status of the vehicle routing problem is deeply analysed. According to different factors, the vehicle routing problem is based on the basic model and the derivative model. To classify and solve the current research hot issues-open vehicle routing problem and dynamic network vehicle routing problem. The system includes vehicle scheduling, management of carrier bills, electronic map display, basic information maintenance and other functions.
Evaluation of cable moisture-proof measures based on AHP
Authors: Luan Le , Wang Hongbin , Peng Heping
Published: September 2020

With the widespread use of cross-linked polyethylene (XLPE) cables in the power system, the problem of aging due to moisture ingress of XLPE cables is becoming increasingly prominent. Under the humid laying environment, the XLPE cable sheath is easy to damage. The storage seal is improper or the water fill in the cable channel causes the XLPE cable to be immersed for a long time, which will seriously affect the insulation and service life of the cable. Therefore, it is important to establish a systematic evaluation system for moisture-proof measures of XLPE cables. This paper analyzes the reasons for the moisture of XLPE cables and the common moisture-proof measures. Based on the AHP method, comprehensively considers the impact of economy, technicality, applicability and feasibility, and establishes an evaluation system of cable moisture-proof measures. In the evaluation system, the criteria layer is subdivided into seven secondary indicators. For the plan layer, comprehensively consider the XLPE cable structure, cable materials, cable accessories and laying environment and other factors to select the XLPE cable moisture-proof measures for comparison. This paper uses AHP to figure out the comprehensive weight of each moisture-proof measure to the target layer, and the consistency test was conducted to prove the validity. The results have shown that the XLPE cable using water treeing resistant material in the plan layer has the best comprehensive effect. This paper provides a systematic and comprehensive evaluation system for future researches on cable moisture-proof measures, and the research results provide reference value for cable design and selection in the hot and humid areas.
Research on Multi-Objective Optimal Dispatch of Microgrid Containing Electric Vehicles Based on Improved NSGA-II Algorithm
Authors: Liu Yang , Liu Tianyu
Published: September 2020

In this society where resources are increasingly scarce, the microgrid is developing rapidly in anticipation, due to the random energy storage characteristics of electric vehicles, the integration of electric vehicles in the microgrid is of great significance to suppress the volatility of new energy. In this paper, a microgrid model of renewable energy, energy storage equipment, micro-turbine and electric vehicles is established, and the impact of time-sharing electricity prices on system operation is fully considered., With the operating cost of the microgrid system and the cost of environmental pollution control as the goal, use the improved NSGA-II to solve. The effectiveness of the proposed microgrid optimization model is verified through analysis of examples, and compared with the standard genetic algorithm algorithm to solve the model. The results show that the improved algorithm can effectively improve the algorithm’s operation efficiency and optimization ability, and in the microgrid Access to electric vehicles can also reduce environmental pollution and reduce the cost of operating microgrid systems.
Status and development of flexible wing aircraft
Authors: Ao Yuntu , Ma Liangzheng , Huang Wei , Li Yu , Wang Ying
Published: September 2020

The flexible wing aircraft is derived from the flexible wing and can be divided into inflatable and parafoil type according to its wing type. The flexible wing aircraft has a broad application in both aerospace, missiles and unmanned aerial vehicles. This paper summarizes the current status and application prospect of flexible wing aircraft by summarizing the research of domestic and foreign scholars. Finally, this paper is summarized and the outlook for development is presented.
Generation rights model based on time-division clearing theory
Authors: Li Daoqiang , Sun Yu , Li Guodong , Tian Shi , Zhang Xiaochun
Published: September 2020

China’s renewable resources have the characteristics of reverse distribution, under the background of large-scale development of renewable energy consumption, we should break the existing administrative regional barriers of renewable energy electricity consumption across provinces. In order to accelerate the promotion of renewable energy consumption liability mechanism, an effective curve declaration and clearance model should be proposed. Based on the theory of time-division clearing, this paper makes some improvements in declaration and clearing. Two models are proposed, namely the time-division declaration model and the proportional declaration model. In addition, two clearing methods under different curve declaration decomposition methods are proposed, namely time-division matching clearing method and marginal clearing method. Based on the above theory, the organization methods of power grid and power right transferor and transferee are proposed to promote the optimization of power supply structure and the consumption of renewable energy.
Study on distribution characteristics of wireless charging system coupling mechanism
Authors: Wang Zhaohui , Huang Xin , Li Chuan , Li Jin , Zhang Baoqiang
Published: September 2020

Coupling mechanism is one of the key issues in the research of electric vehicle wireless charging system. Single D and DD are two kinds of coupling mechanism commonly used in wireless charging system, and spatial magnetic field distribution are different depending on the coupling mechanism. In this paper, the expressions of magnetic flux density at any point in a single D and DD were derived. A 3D magnetic field measurement platform was built and the magnetic field distribution was drawn. The experimental results show that in the primary test, single D type magnetic induction intensity is 1.18 times of DD type, with the increase of the transmission distance, DD type coupling mechanism of magnetic induction intensity attenuation is slow, and on the secondary side of DD type magnetic induction intensity is 1.12 times of D type.
Research on Key Technologies of Substation Comprehensive Energy Saving in the Background of Smart Grid
Authors: Shang Lisha , Jia Yajuan , Shi Erna , Zhao Qian
Published: September 2020

In the current process of social and economic development in my country, electric energy as a basic power has become an important foundation for building economic growth. At present, in my country’s various substation systems, the application of intelligent substations has become the mainstream form of substation construction engineering with the progress of technology. As an important part of the intelligent substation building, the energy-saving system of intelligent substation building can achieve the purpose of high efficiency and energy saving while ensuring the normal operation of the substation. This article will start with a variety of smart substation building structures, and comprehensively analyse the functions, functions, and effects of smart substation energy-saving systems.
Preparation and properties of porous electrode of supercapacitor based on particulate leaching method
Authors: Wang Guanzheng , Liang Bo , Du Ye , Wu Lulu , Zhang Xiaojuan , Wang Weifeng , Lin Chuan
Published: September 2020

Supercapacitor is a new type of energy storage element between traditional capacitor and battery. Particulate leaching method, which was used to increase specific surface area, was the main idea of this article. First of all, GR-PPy material was prepared by chemical in situ polymerization (FeCl3-MO self-degradation template was used to polymerize pyrrole monomer on GR layer). Subsequently, acetylene black and polytetrafluoroethylene emulsion were added and carbon paste electrode was obtained. At the same time, the porous electrode was prepared by particulate leaching method. Cyclic voltammetry, constant current charge and discharge test and AC impedance test were conducted in 1mol· L-1 Na2SO4 electrolyte. The results showed that the specific capacity of the porous electrode was increased by 12% compared with the normal electrode, and the ion diffusion rate was faster than the blank group. In addition, this porous treatment had little effect on the stability of circulation and the electrode resistance. Therefore, it could be concluded that the porous electrode is a promising electrode of supercapacitor.
Multi-objective Optimization of Park-level Integrated Energy System: Model and Analysis
Authors: Wang Jingtao , Zhao Wei , Wang Hongyan
Published: September 2020

Using an integrated energy system can increase the proportion of renewable energy and comprehensive energy utilization efficiency, which help solve problems such as environmental pollution, carbon emissions, and depletion of fossil energy. The actual construction and operation of an integrated energy system need to consider not only the economy, but also the energy consumption and carbon emissions. Therefore, it is necessary to establish a multi-objective optimization model of the integrated energy system to achieve the combination of economics, energy saving and environmental protection for the system is optimal. In this paper, a multi-objective optimization model for an integrated energy system is established, and the influence of different decision makers’ preferences on the optimization results is studied through the model.
Research on Key Technology of State Evaluation and Replacement Acquisition System of Intelligent Electric Energy Meter Based on Smart Grid
Authors: Li Yijing , Zheng Hong , Chen Yuanting , Zhuang Dahai , Zheng Xiaohui , Gao Qiangqiang , You Xuemin
Published: September 2020

Based on big data technology, the smart meter operation status analysis system uses distributed storage, distributed analysis and calculation, and data mining to integrate the mass of energy meter information in the electricity information collection system, measurement and production scheduling platform, and marketing business system. The data is converted into a smart meter operation status report, which guides the staff to calibrate or rotate the meter, and solves the problem of wasting human and material resources in the current meter management method. The concepts and key technologies of big data technology and data mining are expounded, and the big data platform of the hierarchical structure smart meter operation status analysis system is introduced in detail.
Research on High-voltage Leakage Monitoring of Electric Tractor Based on Insulation Resistance Model
Authors: Cao Bowu , Yan Yinfa , Jiang Hao , Mu Junlin , Xu Chunbao , Liu Xuemei , Liu Shuangxi
Published: September 2020

Electric tractor is more environmentally friendly and more efficient than traditional tractor, which has become a hot spot in the field of Agricultural Engineering in China. In order to monitor the leakage phenomenon of lead-acid battery device, this paper takes the 25 horsepower electric tractor as the research object, takes the high-voltage monitoring leakage model of electric vehicle established by the overall insulation resistance model as reference, establishes the overall insulation resistance model of battery and DC brushless motor system to monitor the overall insulation resistance of battery and motor working system to ground. Firstly, the theoretical analysis is carried out to clarify the insulation resistance measurement principle. Secondly, the measurement results are observed by changing the insulation parameters and auxiliary measurement resistance value. Finally, the measurement principle diagram is built by using the Simulink simulation environment of MATLAB simulation software. The model is simulated by setting reasonable parameters. The measurement error is obtained by comparing the operation results with the theoretical values. According to the simulation results, the measurement error of asymmetric insulation resistance of motor side to ground is smaller than that of symmetrical insulation resistance of motor side to ground, and the smaller the auxiliary resistance value is, the smaller the measurement error is.
Research of Key Techniques of Grid Dispatching and Control System in the Environment of Dispatching and Control Cloud
Authors: Zhao Pu , Qu Hanbing , Lin Qirong , Jia Yujian , Zhang Yuying , Wang Yong
Published: September 2020

The dispatching and control cloud (DCC) is a new technology based on technology like cloud technology, big date, and internet technology, which aims to improve the integrated operation quality of bulk power systems. The application of cloud technology to grid dispatching and control (GDC) system is significant to the management level of dispatching operation of the grid, but will also bring new challenges. Taking the maintenance of data information, the security of network and the control of operation and maintain into consideration, this paper explores the key techniques of GDCS in the environment of DCC, and focus on the scheme to enhance the ability of operation and management of GDC system.
Research on Application of Energy Storage Technology in Microgrid
Authors: Liu Kaicheng , Zhong Ming , Zeng Pingliang , Zhu Liangguan
Published: September 2020

With the introduction and development of modern working process control technology theories, people are more convenient and flexible in controlling the working process of energy storage power generation equipment, and thus their application scope and space have also been greatly expanded and expanded. In this paper, the main technical approaches, functions and feasibility of the application of energy storage power generation equipment in the load system microgrid are extensively studied.
Research on Optimal Dispatch of Water-Fire-New Energy Power System
Authors: Sun Wentao , Wang Zhonghui , Hu Jinjing , Lian Jinda
Published: September 2020

In order to safeguard their own energy security, strengthen environmental protection and prevent climate change, many countries in the world are vigorously developing renewable energy to replace traditional fossil energy. As the largest developing country in the world, China’s energy structure and development situation are in a very serious situation, and the energy security problems are threatening the smooth implementation of the national energy strategy. Accelerating the development and utilization of renewable energy has become the best choice to solve the energy crisis in China. Wind and solar energy, as an important part of new energy, are gradually infiltrating into China’s power system. However, due to their great randomness, they are bound to bring severe challenges and a series of difficulties to the traditional power system optimal scheduling problem. China is rich in water energy resources, hydropower is the largest renewable energy that can be developed on a large scale at present, vigorously developing hydropower can significantly reduce the consumption of traditional fossil energy, and at the same time it will absorb some negative effects of new energy power generation through controllable adjustment. Therefore, it is necessary to rationally formulate the optimal dispatching strategy of multi-energy complementary power system for the development of China’s energy strategy. This paper has carried on a series of discussions and carried out the following work. (1) Comprehensively analyze the reasons for the uncertainty of new energy power generation, study the probability distribution model of prediction error, and discuss the new energy power generation scenario with the scenario analysis method. (2) The traditional combined optimal dispatching model, the combined dispatching model with new energy generation system and the multi-energy complementary power system are calculated respectively, and the optimal dispatching strategy is given through an example analysis. (3) Complex models need efficient algorithms to solve, so this paper proposes a new intelligent optimization algorithm.
Research on Substation Comprehensive Information Automation System Based on Smart Grid
Authors: Xu Jie , Yuan Hui , Huang Jie , Zhu Guowei , Xu Ning , Zhu Zhaoyu , Gao Hang , Zhang Yintie
Published: September 2020

In order to cope with the needs of large-scale substation intelligent transformation in China during the “13th Five-Year Plan” period and the corresponding intelligent transformation of traditional substation condition monitoring systems, this article takes 500 kV traditional substations as an example. Analysis of standards, software and hardware of station control layer and bay layer, diagnostic methods, etc., gives the realization method of upgrading, and points out the next research direction. This transformation can lay a good foundation for the informationization, automation and interaction of the smart grid.
Sensitivity Analysis and Forecast of Power Load Characteristics Based on Meteorological Feature Information
Authors: Li Hu , Tan Jian , Han Jun , Ge Yi , Guo Dehua
Published: September 2020

The rapid development of big data and artificial intelligence technology provides a good way to analyze the factors of power demand changes. In this paper, the meteorological factors that affect power demand are studied in depth, and a meteorological factor index system for power demand change is established. Based on the identification method of dominant meteorological factors, the coupling relationship between meteorological factors and power loads is quantitatively evaluated; The sensitivity of load changes in commercial, residential and industrial industries under typical scenarios is analyzed, and the relationship between dominant meteorological factors and quantification affecting the load changes in summer and winter is studied. Finally, the validity of this model is verified by the sensitivity analysis and prediction of power load characteristics to meteorological information based on the data of Nanjing power network.
Analysis and Treatment of abnormal Expander Oil Level in a 220kV Current Transformer
Authors: Zhang Dewen , Hu Xiaoxu , Zhang Kexin , Liu Yang , Zhang Guangzhong , Shen Yubo , Han Siwei
Published: September 2020

A disassembly analysis and treatment of abnormal oil level fault of current transformer expander is introduced in this article. After returning to the factory for a comprehensive electrical test and investigation, it was found that the reason was the wrong wiring of the zero screen lead. Recommendations for quality control and preventive measures and operation and maintenance procedures for this type of electrical equipment are given in this paper, providing a basis for further research.
Research on Development Technology of AC / DC Hybrid Distribution Network Construction in Smart Grid
Authors: Qu Qi , Xu Dafeng , Zhai Zhenyu , Li Qiang , Zhang Wei
Published: September 2020

At present, the flexible interconnection of flexible power grids based on flexible DC and the combination of AC and DC distribution networks in smart grids will bring great changes and challenges to the operation of traditional power distribution systems. The AC / DC hybrid distribution network can better accept distributed power and DC loads, alleviate the contradiction between limited corridors and high load density in urban power grid stations, and provide dynamic reactive power support at the load centre, which can effectively improve the urban distribution system. Power quality, reliability and operating efficiency. This article summarizes and analyses key technical issues such as the topology, optimization planning, dispatch control, and economic evaluation of AC-DC hybrid distribution networks. Finally, the application prospects of AC-DC hybrid distribution networks are prospected.
Research on Renewable Energy Access to Power Grid Based on Energy Internet Technology
Authors: Qu Qi , Sun Xiaolong , Xu Shengzhi , Li Qiang , Zhang Wei
Published: September 2020

The Internet of Energy is the key to achieving the goals of China’s energy revolution, and Internet technology will become an important means to promote the transformation and development of China’s energy industry. Based on the analysis of the current research status of virtual synchronous machines, an implementation method of a virtual synchronous machine algorithm based on a synchronous rotating coordinate system is proposed. This algorithm does not require a phase-locked loop, which greatly improves the accessibility of renewable energy and realizes its transformation from auxiliary energy to main energy. Simulation results verify the effectiveness of the proposed algorithm.
Research on Key Technologies of Connecting Various Distributed Power Sources to Smart Grid
Authors: Guo Xuejian , Liu Yong , Yu Ronghua , Zhang Yintie , Zhang Wei
Published: September 2020

In order to solve the impact of distributed power supply (DG) access on the fault location and voltage quality of distribution network, the paper combines the characteristics of random fluctuating DG grid connection, and studies a way to use SVG dynamic reactive power compensation to maintain randomness The control strategy of the voltage stability of the fluctuating distributed power supply node, based on the detailed analysis of the determination method of the SVG capacity, a new optimization strategy for the distribution system containing different types of DG is proposed, that is, using the static reactive power generator VG and output-adjustable DG’s own reactive power capacity for fine-tuning control, the use of traditional static compensation device comprehensive adjustment optimization strategy. At the same time, the economic optimization operation model of the distributed energy system is analysed to verify the feasibility of the optimization strategy.