bluuebunny/crossref_metadata_2025 huggingface dataset:
Progress in Landscape Ecology research in China
Authors: Li Yanan , He Jing , Chang Min
Published: August 2019

Landscape ecology is a new interdisciplinary subject that has developed rapidly in recent years and is the focus of current research on resources, environment and ecology. Landscape ecology relies on the theoretical framework of ecology, absorbs the essence of modern geography and systems science, and studies the type composition, structure (spatial pattern), function (ecological process) and evolution (spatial dynamics) of landscape units and their ecology. A comprehensive discipline that interacts with the learning process. This paper briefly introduces the development history of landscape ecology in China, summarizes the progress of landscape ecology research, briefly analyses the problems existing in landscape ecology research in China, and forecasts the research direction of landscape ecology.
Research of Urban Suitable Ecological Land Based on the Minimum Cumulative Resistance Model: A Case Study from Hanoi, Vietnam
Authors: Tran Ducthien , Xu Dawei , Alwah Abdulfattah.A.Q. , Liu Bingxi
Published: August 2019

Rapid urbanization process is accelerating the dramatic transformation of urban land use, creating strong economic, social and environmental impacts in Hanoi (Vietnam). Improving the quality and optimizing the model of using ecological land in urban areas is very important to solving environmental issues and sustainable urban development. Using the Hanoi capital of Vietnam, an important and typical city in the Red River Delta, as in the case of the study, we applied the Minimum cumulative resistance model (MCRM) to calculate ecological land and constructed land meet the needs of socio-economic development and ecological protection. Results showed that the suitable ecological land area is about 2.090,298km2 (ecological land area 1.112,216km2, ecotones land area 978,082km2), which is 62% of the total urban area of Hanoi is mainly distributed in Bavi, Socson, Unghoa, Myduc, Chuongmy districts and Sontay town; and constructed land area is about 1.275,736km2, which accounts for 38% mainly distributed in the city center and urban areas. Study the ecological land space and construction land of Hanoi area and compare with the current land use status through simulation of MCRM model, we propose three types of land use. For urban ecological land, there must be measures to manage and protect the ecological environment and prohibit construction activities in the area. For ecotones land between urban construction land and ecological land, it is necessary to control and limit the construction to improve the quality of the ecological environment. For construction land, there must be a policy to promote construction along with reasonable and efficient land use development to improve urban living environment.
Coal blending optimization model for reducing pollutant emission costs based on Support Vector Machine
Authors: Zhao Yue , Wang Guilin , Hu Qingbo , Zhou Yigang
Published: August 2019

Factors such as the pollutant formation, pollution emission punishment and pollutant control devices are considered to optimize the coal blending method for a 300 MW boiler unit. The support vector machine (SVM) is used to establish the pollutant formation prediction model for the coal–fired boiler. Moreover, the model built above is trained and verified based on the actual operation data. Then the genetic algorithm is applied to optimize the coal blending method with the coal price to achieve the lowest operation cost. It can be concluded from the results that the precision of the prediction model is relatively high and the ammonia consumption, NOx emission punishment, CaCO3 consumption and desulfurization water consumption have all decreased after optimization, which means both the desulfurization cost and denitration cost are reduced.
System for startup of partial nitritation - ANAMMOX - denitrification (PNAD) reaction
Authors: Li Ming , Wang Yuefeng , Qin Zhe , Tian Zaifeng , Luan Yongqing , Lu Da
Published: August 2019

A partial nitritation-anaerobic ammonium oxidation (ANAMMOX)-denitrification (PNAD) process was activated to provide the basis and experience for engineering. A stirred up-flow reactor with surface continuous oxygen-limited aeration was used to realize partial nitritation by controlling the dissolved oxygen (DO) (0.4-0.5mg/l) of the reactor. In this study, an ASBR reactor was inoculated with ANAMMOX activated sludge with denitrification properties. After 98 days of activity recovery, the total nitrogen removal rate reached 90%. The reactor was run to the 194th day, with the total nitrogen removal efficiency reaching 95% after increasing influent nitrogen concentration on the 99th day, and the two reactors were combined in series. Up to the 212th day, the influent NH4
+-N was 253.51mg / (l·d), and the effluent NH4
+-N, NO2
−-N and NO3
−-N concentration were 1.67 mg / (l·d), 1.18 mg / (l·d) and 5.68mg / (l·d) respectively. In addition the activated sludge of two reactors was also identified by 16S rRNA
Operation optimization of SCR system based on denitration efficiency prediction model
Authors: Wang Guilin , Zhou Yigang , Zhao Yue , Wang Sen
Published: August 2019

In this paper, models for NOx emission prediction and denitration costs are built with support vector machine. The effects of the factors such as SCR inlet NOx content, unit load, oxygen content of exhaust gas, ammonia injection rate, air distribution condition, and coal type on NOx reduction are discussed. The denitration costs under different working conditions are calculated. The ammonia injection rate is optimized with genetic algorithm. It can be shown that the actual ammonia injection rate is 1%-3.5% lower than the optimal value.
Improvement of the air-sea flux parameterization scheme in the ocean circulation model
Authors: Liu Jingdong , Shi Jian , Zhang Wenjing , Feng Guanyan
Published: August 2019

COARE (Coupled Ocean-Atmosphere Response Experiment) algorithm is the more advanced algorithm, calculating the air-sea flux. COARE 3.0 is the latest version. In this paper, the COARE 3.0 bulk sea-air flux parameterization scheme is introduced into the SBPOM model. Compared the simulated sea surface temperature (SST) of the SBPOM ocean model with COARE 3.0 and without COARE 3.0 in the areas near equator, and analysed the reasons for the differences in the simulated SST. The results showed that the COARE 3.0 bulk air-sea flux parameterization scheme is good in the SBPOM ocean model. The simulation accuracy of the SBPOM ocean model in the areas near equator has been improved after the COARE 3.0 bulk sea-air flux parameterization scheme was introduced, and the simulation error of most areas was within 1°C, which was mainly due to the accuracy of the calculation of momentum flux improved by COARE 3.0 bulk sea-air flux parameterization scheme.
Arsenic pollution status and repair technology: an overview
Authors: Bo Yan , yang Wei
Published: August 2019

The article focuses on the status quo of drinking water, groundwater and soil arsenic pollution at home and abroad, and expounds the harm of chronic arsenic poisoning and acute arsenic poisoning on human skin, respiratory system and nervous system. The leaching technology, solidification stabilization technology, physical repair technology and its effects of arsenic-contaminated soil remediation were introduced selectively, and the nanotechnology repair arsenic pollution was briefly introduced.
Environmental Assessment Model Based on the Back Propagation Neural Network
Authors: Zhou Dengli
Published: August 2019

With the continuous development of economy and society, the problem of environmental pollution is becoming more and more serious. However, people’s demand for a better environment is increasing. Under this background, it becomes particularly important to effectively evaluate the quality of the environment. So we use the Back Propagation Neural Network(BPNN) to establish a weight model. The model mainly includes Driving force, Pressure, Status, Influences, Response indicators and has strong practicability. Subsequently, we examined the impact of land development projects on the environment and conducted an analysis of land development projects taking into account environmental costs. Finally, we use our model to evaluate the Three North Shelter Forest project. Through the evaluation, we can find that the project has greatly improved the local ecological environment, making it a great project. To sum up, the model we have established can effectively evaluate the quality of ecological balance and has certain practical guiding significance.
Environmental Greening And Tree Health Maintenance Based on Color Histogram
Authors: Xie Junlin , Wang Ruiping , Ma Shanpeng , Han Xu , Yu Qirui , Yang Huijun , Wang Xin
Published: August 2019

Due to man-made damage, plant diseases and insect pests, environmental greening, ecological environment and other reasons, ancient and famous trees have been severely damaged. The protection of ancient trees requires diagnosis of their health and biological and chemical treatment measures. Aiming at the inconvenience, high cost and low degree of automation of manual methods for health diagnosis of ancient trees, the solution and overall architecture of a tree health diagnosis system based on OpenCV and genetic algorithm are analyzed and designed. Firstly, the leaf image mode is trained, and the color histogram is used to distinguish the leaf density and color difference between different individuals, and the fitting index is used to obtain more accurate diagnostic classification standards. Then, the matching value is calculated by genetic algorithm training through the H average value in HSVHSV and the H average value of healthy ancient trees in the histogram to obtain the matching grade. Then, the tree image is read, artificial segmentation is carried out to obtain the quasi-healthy crown score, weighted summation is carried out to obtain the leaf score, and the health grade is separated according to the ratio. Finally, the two are weighted to obtain the final health grade. The experimental results show that the system can accurately and effectively distinguish different leaf health grades according to the difference of leaf color and density, and provide quantitative data for health diagnosis research of ancient and famous trees.
A Novel Modified Electromagnetism-like Algorithm for Solving Constrained Optimization Problem
Authors: Cao Wenming , Fang Jianwen , Huang Gan
Published: August 2019

The original Electromagnetism-like mechanism (EM) is a meta-heuristic algorithm utilizing an attraction-repulsion mechanism (called as force F) to move sample points towards optimality in global optimization problems. To solve the potential problem of stagnation happening in the original algorithm, new searching procedures were proposed in modified algorithm to determine the next search direction and step length of points in the paper. Compared to the original algorithm, tri-factors of the best historical visited positions of each point, best point and total force F were considered in the improved searching procedures. Moreover, the feasibility and dominance (FAD) rules were incorporated to extend the proposed algorithm to solve constrained optimization problem. Finally, Preliminary experiments verified the effectiveness of the proposed algorithm.
Analysis and Treatment of Shutdown Due to Bearing Vibration Towards Ultra-supercritical 660MW Turbine
Authors: Li Wanjun , Li Xiaoxia , Niu Qingliang , Huang Tianqi , Zhang Deke , Dong Yang
Published: August 2019

During the normal operation of an ultra-supercritical 660MW steam turbine in a power plant, the temperature of low-pressure shaft seal steam inlet gradually increases, and the vibration of steam turbine bearing suddenly increases, leading to the steam turbine shutdown. The diagnosis and troubleshooting of major vibration faults of steam turbine bearing are carried out, and the causes of faults are accurately analysed through collecting field data, checking maintenance records and disassembling inspection of relevant equipment. Taking corresponding effective measures to eliminate the potential equipment safety hazard.
Abnormal shutdown analysis and treatment of sub-critical 300MW unit due to low EH oil pressure
Authors: Li Wanjun , Li Xiaoxia , Niu Qingliang , Huang Tianqi
Published: August 2019

When the sub-critical 300MW steam turbine generator set of a power plant operates normally, the pressure of EH oil system gradually decreases when the B EH oil pump operates, then switching to A EH oil pump, the pressure of EH oil system rises and then gradually decreases to the protection action, and the unit shutdown. Through on-site inspection and inspection of maintenance records, it was found that the EH oil particles seriously exceeded the standard. The leakage fault of the absorbent in the regenerated filter element of the external oil filter was diagnosed and investigated. After replacing the EH oil pump inlet and outlet filters, the inlet filter of the main valve and the regulating valve oil motor control block, the EH oil system was flushed with a large flow of EH oil and replaced with a new EH oil, and other effective measures were taken to eliminate the potential safety hazards in equipment operation.
Shutdown analysis and treatment of 150MW steam extraction heating unit due to low oil fuel level
Authors: Li Wanjun , Li Xiaoxia , Niu Qingliang , Huang Tianqi
Published: August 2019

When the 150MW steam turbine generator set of a power plant operates normally, the pressure of EH oil system gradually decreases and the fuel level drops in the tank, then switching to standby EH oil pump, the pressure of EH oil system continues to drop to the protection action, and the unit shutdown. Through on-site inspection and inspection of maintenance records, it was found that there was serious oil leakage at the oil outlet of mobile oil filter and the oil outlet pipe of EH oil cooling pump. The cause of the fault was analyzed accurately. Effective measures such as changing the connection mode between mobile oil filter and EH oilto eliminate the potential safety hazards in equipment operation.
Analysis and treatment of shutdown due to high condenser pressure towards ultra-supercritical 660MW turbine
Authors: Li Wanjun , Li Xiaoxia
Published: August 2019

During the normal operation of an ultra-supercritical 660MW steam turbine in a power plant, the pressure of condenser gradually increases, then reduced electrical load, condenser pressure continued to rise to the protection action, the unit shutdown. Through on-site inspection and inspection of the operation curve, it was found that after the water level of the collecting water tank of the boiler’s starting hydrophobic system was zero, the B hydrophobic pump was still closed and the outlet electric door was not closed. The fault of the B hydrophobic pump’s trip relay was diagnosed and investigated, and the cause of the fault was accurately analyzed. After replacing the tripping relay and adding the tripping logic of the drain pump, the unit can be restarted and run normally.
Discussion on Flexibilization Reconstruction Plan of a 300MW Unit’s Pulverizing System in Northeast China
Authors: Xue Fangming , Su Jingcheng , Sun Yiqing , Liu Xiuru
Published: August 2019

In order to cope with the problem of renewable energy consumption, power plants in Northeast China need to carry out corresponding flexibility transformation to improve the peak peaking capacity of the unit. Among them, the transformation of the milling system is a key and difficult point in the whole process of transformation. This paper analyzes the possible problems caused by the transformation and proposes solutions by analyzing the 30% TRL milling system.
Study on analysis of acid number of transformer oil by temperature titration
Authors: Chen Suhong , Zhu Yi , Jia Yuling , Yun Yuxin , Han Zhijun , Feng Gao , Zhang Lei , Pang Xiangkun
Published: August 2019

Important test methods for acid number of oil products were introduced, and their characters, difference and selection Principle were described. And the temperature titration method was used to determine the acid number of transformer oil. Meanwhile, several major factors that may affect the outcome were discussed.
Slag Cooler Waste Heat Supply System and Energy Saving Analysis
Authors: Zhu Lingkai , Shang Panfeng , Zheng Wei , Guo Ying , Han Yue , Guo Junshan , Ding Junqi , Lao Jinxu , Zhang Yanpeng , Liu Jun
Published: August 2019

In view of the drawbacks of the traditional scheme of recovering residual heat from slag cooler to condensate water system, this paper proposes a new scheme for the utilization of residual heat from slag cooler of circulating fluidized bed heating units. During heating period, a return water from heat network is drawn from the main return water pipeline of heat network as the cooling water source of slag cooler. The residual heat of slag cooler is directly used for heating, and the residual heat of slag cooler will be recovered to condensate water system in non-heating period, in order to realize the free switching between the two schemes, valves are installed in the pipeline. The energy-saving effects of the two schemes are analyzed, and the results show that the new scheme is more energy-saving.
Research on Power Behavior Analysis Based on Clustering
Authors: Li Xunjia , Zhang Tao
Published: August 2019

This research is based on data clustering to analyze power users’ electricity consumption behavior, and analyzes the load curve to obtain the users’ electricity consumption characteristics and classify users according to the characteristics of electricity consumption behavior. It is of far-reaching significance to the power industry and socio-economic development. This paper introduces the principle and flow of the main clustering algorithm K-means, fuzzy clustering and neural network clustering algorithm. The data preprocessing method is given. The clustering algorithm and the optimal clustering number are determined by defining the clustering volatility and clustering accuracy index. Then the power consumption behavior of the user is analyzed through the load curves and characteristic parameters obtained through clustering.
Transformer winding hot spot temperature prediction based on ε -fuzzy tree
Authors: Zhang Yue , Shan Lianfei , Yu Jianming , Lv Hongwei
Published: August 2019

Transformer hot spot temperature is closely related to its operating life, which plays a key role in transformer thermal fault prevention and operational status monitoring. In order to effectively improve the prediction accuracy of the transformer winding hot spot temperature, a method based on ε-fuzzy tree (ε-FT) for predicting winding hot spot temperature is proposed. Taking the 220kV transformer of a substation as the research object, the input and output characteristic variables are extracted through the analysis of relevant mechanisms, which is applied to establish ε-FT model of the transformer winding hot spot temperature, and the proposed method is compared with the other methods. Subsequently, the noise and outliers are added to the modeling data to verify the robustness of the proposed method. The results show that the method can accurately predict the hot spot temperature and resist the bad data in the modeled samples, which has strong generalization ability and robustness.
Effect of Pb-Te-Si-O glasses on Ag thick-film contact in crystalline silicon solar cells
Authors: Qin Jun , Zhang Weijun , Yang Jinchao , Du Guangbao , Cai Xinan
Published: August 2019

In the paper, the influences of Pb-Te-Si-O (PTSO) glasses on Ag thick-film contact in crystalline silicon solar cells were investigated. Thermal properties of PTSO glasses and the dissolution process of Ag were studied. The formation of a new low-softening-temperature glassy-phase, induced by the crystallization of PTSO-1 glass, accelerated the dissolution of Ag at lower temperature. When silver paste was sintered, high-viscosity PTS-1 glass could flow to the surface of the cell and etch SiNx ARC layer at relative high temperature and the time for etching through SiNx ARC layer was shorter. Viscosity-temperature properties of PTSO glass has played a great role in the microstructures of contact finger and Ag/Si interface and have a great effect on the quality of Ag/Si contact and electrical properties of cells by affecting the sintering process of Ag, the etching behavior of interfacial glass with SiNx and Si, and the size and size distribution of Ag crystallites grown into the Si emitter at the position of inverted-pyramid etching pits.
Optimization of Distribution Network Construction Based on GIS System
Authors: Tian Qin , Wan Zixin , Zou Yunpeng , Hang Chenghao
Published: August 2019

With the rapid development of China’s economy and science and technology, people’s daily life and scientific research work demand more and more electricity. The traditional distribution network structure and load can hardly meet the actual demand. Therefore, it is very necessary to construct a more stable distribution network system in accordance with the actual demand for electricity. This paper mainly introduces the application of GIS system in power distribution network planning and design, and realizes the optimization and upgrading of power distribution network in coordination with the geographic information of the construction site, so as to meet the increasing demand for electricity.
Research on Network Traffic Anomaly Detection of Source-Network-Load Industrial Control System Based on GRU-OCSVM
Authors: Huo Xuesong , Wu Kehe , Miao Weiwei , Wang Liming , He Hui , Su Dawei
Published: August 2019

With the large number of distributed generators and diverse loads connected to industrial control systems, there are more and more interactions among power supply, power grid and load. Any network link attack in the source network will affect the security of the industrial control system, resulting in economic loss of the industrial control system. Therefore, it is very important to study the network attacks against the source-network-load industrial control system. Aiming at the current insufficient situation of network traffic anomaly detection in the source-network-load industrial control system, this paper analysed the composition and flow characteristics of the source-network-load system, studied the scheme of network traffic anomaly detection of the source-network-load system, and proposed a network traffic anomaly detection algorithm based on GRU-OCSVM. The time characteristics of the traffic sequence were extracted by the GRU and input into OCSVM for traffic anomaly detection. Finally, the original network traffic of the source-network-load system was collected to construct anomaly detection data set for simulation experiment. The experimental results showed that the proposed method had high detection rate and low false positive rate, which can meet the needs of network traffic anomaly detection in the source-network-load system.
Study of China’s biomass power generation technology
Authors: Li Rui
Published: August 2019

With the rapid growth of the population and the continuous advancement of the times, the problem of energy shortage has become a problem that needs to be faced together in the world. To make use of new technologies to achieve rational use of energy has become a topic faced by researchers in various countries. Biomass power generation technology has been effective in mitigating such problems. Biomass power generation is one of the new energy generation technologies, with the advantages of low carbon emissions, environmental protection and sustainable development of new energy sources. Biomass power generation has attracted the attention of countries all over the world because of its good economic and social benefits. Based on this, this paper describes the concept and characteristics of biomass energy and the technologies that biomass energy is applied in power generation.
Design and Feasibility Analysis of Compressed Air Aquifer Energy Storage System
Authors: Zhu Mingyu
Published: August 2019

Compressed air energy storage system is developing rapidly as the most promising energy storage technology, and gas storage device is one of the main components of compressed air energy storage system. Aquifer compressed air energy storage can break the dependence of traditional compressed air energy storage on geological conditions such as large rock caves, and can realize large scale storage of compressed air. In this paper, the development and progress of compressed air energy storage in aquifer are summarized firstly. Then, taking 3.5 Mw energy storage scale as an example, the energy storage model of underground aquifer with buried depth of 800m in horizontal stratum is established by using numerical simulation method. The formation of the initial airbag after gas injection and the cycle times of the pressure system during the system cycle are analyzed. The experimental results show that after a complete cycle, the pressure change in the formation is small; as the cycle continues, the effective gas phase volume in the formation for the energy storage release cycle is slowly reduced.The aquifer has wide distribution and good sealing. It is feasible to store compressed air as a gas storage. The corresponding system design should be carried out according to the actual geological conditions.
Experimental Analysis of Low-rank Fuel Drying Characteristics
Authors: Qiao Lei , Wang Xiaoxiao , Sun Haijun , Fang Yuan , Ye Xiaoli
Published: August 2019

Drying technology of low rank coal, which is the leading technology of low rank coal thermal chemical processing, plays an important role for the efficient use of low rank coal. It has made clear the influence factors of low rank coal drying process and effect of related factors by studying low rank coal occurrence form of moisture and the drying mechanism. In the paper, it has carried on the experimental study in drying characteristic under the condition of fluidized drying in the tube furnace with YuZhou Long-flame coal as the research object, and obtained the correlation curve of the particle size, fluidization velocity, drying temperature, drying rate and the influence factors. At last, according to the experiment and the system economy, the drying process parameters are optimized: the drying temperature is 210 °C, the fluidization air velocity is 1.6 m/s, the drying time is 5 minutes.
Operation Mechanism and Evaluation of Carbon Market in Electricity Industry: A Review of its Current Status and Future Perspectives
Authors: Sun Shuanzhu , Zhou Chunlei
Published: August 2019

The current EU carbon trading market and the RGGI carbon market are relatively successful. Therefore, after studying the EU and RGGI thermal power units participating in carbon trading, it is of positive significance for formulating emission patterns in line with China’s thermal power units. Through the international experience of the carbon trading market, we will build China’s carbon trading market.
Research on carbon emission quota allocation in power industry
Authors: Li Meng , Wang Peng
Published: August 2019

China’s power supply structure is dominated by coal-fired power and has high carbon emission characteristics. The carbon emissions in the power industry account for more than 40% of national total carbon emission. Therefore, the implementation of carbon emission quota trading in the power industry is of great significance to achieve China’s national carbon emission reduction targets. In this paper, a carbon emission quota allocation scheme is determined based on the “historical law” or “baseline method” or a combination of the two, according to carbon market pilot experiences. Then combined with the actual situation of carbon emissions in the power industry and the effect of the allocation plan on carbon emission reduction, we determined the specific carbon quota indicators of the thermal power unit. Finally, the final carbon emission quota allocation solution reflects both the equity and efficiency principles in China’s power industry.
The Parameter Optimization of Regenerative-reheat System in Pressurized Water Reactor Nuclear Power Plant
Authors: Wang Cheng , Sun Haijun , Gao Shan , Cheng Kun , Fang Yuan
Published: August 2019

Regenerative-reheat system is the core of the thermal system of pressurized water reactor nuclear power plant (PWR NPP), which determines the economy of the unit directly. A mathematical model of regenerative-reheat system of a typical 900 MW nuclear power plant is established and validated. Given the bounding condition group, the regenerative-reheat system optimization is carried out by using the hybrid genetic algorithm to optimize the flow of extraction steam. The results show that the output power increases 7.84MW in the optimized scheme, which effectively reduces the nuclear fuel consumption and demonstrates the capability of the optimization method in improving the economy of the NPP.
Design and Implementation of Energy Saving System for Electric Propulsion of Unmanned Vehicle
Authors: Tu Ya
Published: August 2019

Ocean exploration technology has become a key technology in the research and development of countries all over the world. As a new intelligent platform for ocean exploration, unmanned ship has also become one of the important equipment of ocean exploration technology. At the same time, in response to the call of global green energy, the application of energy-saving technology and new energy schemes in unmanned ship electric propulsion system has increasingly become a hot area of ocean exploration technology. In this paper, the electric propulsion system of unmanned ship is designed based on photovoltaic technology, and the mathematical modeling and simulation experiments of the system are carried out. The experimental results show that the proposed UAV electric propulsion system has obvious advantages in energy saving compared with the traditional UAV electric propulsion system. At the same time, the energy-saving electric propulsion system proposed in this paper also has strong dynamic performance and stability performance.
Research on LNG Vehicle Refrigeration Using Waste Cold Energy
Authors: Chen Shuyi , Chen Gang , Cui Wei
Published: August 2019

In order to protect environment, traditional fuel car will be replaced by new energy car. LNG is one of the new energy that be used widely now. On the other hand, vehicle refrigerator is being used diffusely. Traditional vehicle refrigerator need automobile engine to provide extra electric energy to support its work. Indirectly, it will consume more fuel. According to the circumstance that car works, we study basic theory and experiment about recover the cold energy that LNG release during the gasification process to cooling the refrigerator. And provide theoretical direction to invent LNG zero energy vehicle refrigerator.
Analysis of Electricity Consumption and Kinetic Energy Index in Fujian
Authors: Xiang Kangli , Qiu Xiangjing , Xun Chao , Liu Lin , Chen Shanglong
Published: August 2019

The growth situation of emerging industries and new kinetic energy can be reflected by improving the statistical system of the “three new” industries. New ideas for the study of the “three new” industries are provided by the statistical analysis based on power big data. This paper studied the power big data of 2,084 “new industry” enterprises in Fujian province from 2014 to 2018. The research is divided into “new industry” electricity consumption analysis and “new industry” kinetic energy index research. First, the analysis is made for development trend, proportion, seasonal trend, different region and industry’s electricity characteristics of the electricity consumption in new industries. Second, the indicator system of “new industry” in Fujian is constructed. The results showed that,” new industries” are booming in Fujian province, but the momentum for development has weakened in 2018.
Big Data Storage Technology suitable for the Operation and Maintenance of New Generation Power Grid Dispatching Control System Operation
Authors: Zhang Yin , Lang Yansheng , Yang Song , Zhao Kun , Liu Peng , Han Feng
Published: August 2019

The new generation of power grid dispatching control system draws on the cloud computing concept for reference, adopts a new overall architecture of “physically distributed and logically uniform”. It applies a large number of new technologies, enhances the relevance of various applications of the new system, and rapidly expands the application data scale, making the operation and maintenance of the power grid dispatching control system increasingly complicated. At present, the State Grid Corporation of China is carrying out research on operation and maintenance technology of dispatching control system based on historical big data mining. In the face of the collection and aggregation of a large number of operation history data and operation indexes of dispatching control system, the traditional relational database is facing great challenges. This paper discusses the data storage technology supporting big data, and through analyzing the characteristics of big data storage and the existing typical databases of NO SQL and NewSQL, puts forward a data storage technology that can meet the needs of mass operation and maintenance data storage and high-speed access of the new generation of power grid dispatching control system.
Prediction on China’s Energy Consumption Demand Trend Based on Bayesian Theorem
Authors: Gao Chunjiao , Lian Yinghui
Published: August 2019

This paper applies SAS software for data mining and takes the energy consumption data from 2000 to 2015 as the training set and the corresponding data from 2016 to 2017 as comparative set. Due to the exponentially fluctuation of data, the author sets a nonlinear modified exponential rudimentary model, which, when combined with white noise experiment and diagrammatic figure analysis, the model’s fitting effect can be inferred. The result shows that the data extraction of the model is not sufficient enough so that the model should be improved. Seen in that light, the author tries to do dimensionality reduction and differential processing to the original sequence and applies the classical time series ARIMA model for adjustment. It comes out that the fitted model should be ARIMA(4,2,1). The solved result illustrates that the information of the model has been well and sufficiently extracted. After that, the Bayesian model is constructed by taking the estimated parameters of the time series ARIMA model as priori information. The prediction effects of the three models are finally evaluated by Mean Absolute Percentage Error (MAPE) and Root-mean-square Error (RMSE). The result shows that the prediction effect of Bayesian model is somehow superior to that of single time series model. According to the prediction result of Bayesian model based on prior robust, the general demand for energy consumption in China during the 13th Five-Year Plan period tends to climb by a small margin.
Application Research on Ship Diesel Engine Condition Assessment System
Authors: Ma Chao , Chen Long , Zhao Gang
Published: August 2019

In order to promote the development of intelligent ships, accelerate the application research of intelligent technology engineering, and build an intelligent information platform for big data fusion environment based on ship safety, economy and intelligence, it has become an important development direction in the industry. In the process of research and study on the existing methods of ship dynamic system state assessment, this paper applies the rough set theory and DS evidence theory to the application of ship dynamic system state assessment, and builds a ship dynamic system based on rough set theory and DS evidence theory. The state assessment model, and a detailed description of the assessment method, is used to verify the feasibility of the ship instance. Finally, the article uses Visual C# language and MATLAB mathematics tools to carry out systematic experiments on ship power system state assessment.
Studying on the Optimum Frequency of Driving Voltage of Electro-osmotic
Authors: Wang Chunsheng , Wu Shibin , Shang Dongxing
Published: August 2019

Electro-osmotic actuation is an effective method of mixing micro-scale fluids. In this paper, an annular micro-channel mixing model, in which electro-osmosis are used to mix fluids, is established to simulate fluid mixing condition. Simulation results show that for fixed flow parameters, there is a supply frequency that can optimize the mixing efficiency. As the frequency increases, the mixing efficiency increases firstly and then decreases. The optimal mixing efficiency is about 95% at the frequency of 25 Hz. Furthermore, the influence of flow velocity, electrode position and voltage amplitude on the optimal frequency is proposed, and the physical mechanisms are discussed. Numerical analysis shows the electro-osmotic of electric field can produce a vortex, which can increase the mixing efficiency in micro-channels effectively. The mixing efficiency can be improved by increasing voltage amplitude and the electrode gap. When the velocity of fluids increases, the residence time of particles decreases, the frequency of optimization will increase accordingly.
Effect of Different Solar Irradiance Parameters on Reliability Evaluation of the Grid
Authors: Cheng Simeng , Xie Yimiao , Shu Zhan , Wang Yulin , Ning Zhou , Yang Yue
Published: August 2019

Large-Scale volatility photovoltaic grid-connected which will have a profound impact on the reliability of the system. A new method based on maximum likelihood estimation is presented in this paper in which probabilistic distribution of solar irradiance is calculated on the premise of solar irradiance beta distribution, according to volatility and intermittent characteristics of photovoltaic, and simulated the actual solar irradiance which affecting power output of photovoltaic based on Monte Carlo method, then, Established a photovoltaic probability output model which can reflect the randomness output of photovoltaic; and use of the partitioning method, the reliability assessment of an interconnected generation system with photovoltaic connected with IEEE-RTS79 system is performed by Monte Carlo simulation; The results show that there have a contribution on reliability evaluation of the grid when connected on determined location and under a certain load level; also the example show the influence of different parameters of solar irradiation on system reliability indicators and the result show different parameters of beta distribution have a great impact on grid reliability indicators.
Research on Test of Key Parameters of On-Load Tap-Changer in Transformer
Authors: Gu Lingyun , Shi Changkai , Wu Yan , Bai Xuefeng , Li Pengcheng
Published: August 2019

There are two main testing methods for the key parameters of the transformer on-load tap changer. One is the DC test method and the other is the AC test method. Based on the AC test method for on-load tap changer key parameters, a new test scheme was proposed. The on-load tap changer switching operation of the transformer can be simulated by establishing a model. The waveforms of the transitional AC current and the testing AC voltage are stored and preprocessed. Then the transitional AC current is equivalent to DC components through the Park transformation. By using the off-line identification algorithm, the transient stage of the transformer on-load tap changers can be determined and the transition resistance value can be accurately calculated.
Study on Flow Distribution Characteristics of Reactor Passive Residual Heat Removal System
Authors: Yuan Tianhong , Cai Qi , Yu Lei
Published: August 2019

During the passive residual heat removal system at the reactor primary loop (PRHRS) operation, the parallel pipeline is formed between the channels of PRHRS heat exchanger (HX) and steam generator (SG), and the later flow is large, which has a bypass effect on the former flow. Based on one-dimensional N-S equation, a theoretical model is established to describe the flow distribution characteristics of this parallel pipeline. To verify the model, the AP1000 PRHRS is taken as an example, and the results calculated by the model are compared with that of RELAP5 numerical simulation, the error of which is no more than 5%. Based on the model, the flow distribution characteristics of the parallel line are analyzed. The results show that, due to the large flow area and small flow resistance, the SG channel flow is much bigger than the HX channel flow after PRHRS is activated. Because this phenomenon has a great effect on the capacity of PRHRS, it’s necessary to be further analyzed.
Sequential Power Flow Calculation of AC/DC Hybrid System Considering Converter Station Loss and Its Capacity Constraints
Authors: Zhu Yuxin , Wang Xiaolan , Zhang Lu , He Naixing
Published: August 2019

In the power flow calculation of AC/DC hybrid distribution network, the loss and capacity of the converter station have a great influence on the power flow calculation, and the AC/DC alternately solves the power flow, which has the disadvantage of poor convergence performance. In this paper, the power flow model of AC/DC hybrid distribution network with VSC is established. The loss mechanism of the converter station is analyzed and the capacity limit of the converter station is fully considered. The sequential power flow algorithm with VSC AC-DC hybrid distribution network is proposed. Its convergence performance is improved. In the improved 33-node AC/DC hybrid power distribution network with multiple types of DG, the correctness, effectiveness and algorithm fastness of the algorithm are verified.
Simulation Research of Frequency Modulation Control Based on PID
Authors: Liu Zhijian , Chen Xiaoya , Luo Linglin , Wang Yanhong , Liu Xiaoxin , Yu Sha
Published: August 2019

When the balance of power system is broken, the frequency of power system will be deviated. Induction motors are mostly used in industry. Frequency is closely related to the change of speed and output power. Firstly, this paper focuses on the analysis of the mathematical model of the inter-regional tie-line and deduces the Laplace transform of the power variation of the tie-line. The physical model is established to analyse. The fluctuation of the two regions and the interconnected power grid is obtained. The operating point will change in the case of disturbance. The relationship between the switching power deviation of tie-line and the disturbance position point. Through the simulation of the classical two-zone model, the simulation effect of the PID controller is better than that of the conventional controller. The control effect is remarkable, which provides a certain basis for later research. The ideal adjustment parameters of the PID controller are obtained by trial-and-error method. The dynamic and robust performances of the AGC system are further verified by simulation.
Research on photovoltaic power generation system based on power electronics
Authors: Di Miao , Zhang Xuezheng , Zhang Yunhui
Published: August 2019

This paper introduces the DC power obtained from photovoltaic power generation, and then boosts it by the boost chopper circuit. Finally, it is inverted by a single-phase full-bridge inverter circuit into 220V, 50Hz single-phase AC power that meets the normal working requirements of household appliances. Give the load. Among them, the inverter is the most important part, which can convert direct current into alternating current. Before this, it is necessary to increase the DC voltage through a boost chopper circuit and then invert it.
Research on Power System Harmonic Suppression Method of Active Filter
Authors: Di Miao , Zhang Xuezheng , Zhang Yunhui
Published: August 2019

The active filter has different connection methods, and the methods used are also various. With the deepening of research, more novel filtering methods are proposed and applied, which enhances the efficiency and rapidity of filtering. At present, China has made great progress in harmonic suppression. In the face of the fact that harmonic problems are becoming more and more serious, the research of filtering technology and the popularization and application of filtering equipment are urgently needed.
Analysis of Eddy-Current Loss and its Reduction in a Conduction-Cooled HTS Magnet
Authors: Ji Kai , Long Wenfeng , He Jinping , Zheng Jun
Published: August 2019

Since conduction cooling system is environmental friendly and easy operating, the conduction-cooled method is widely used in cryogenic cooling system of high-temperature superconducting (HTS) magnet. The eddy-current losses are generated in the cooling structures when HTS magnet is charging and discharging or the current in the magnet is alternating. In this paper, a 3D model of analyzing the eddy-current loss was built. The eddy-current losses of a HTS magnet with different cooling structures were calculated. Thermal analysis of the HTS magnet was carried out together with the electromagnetic analysis. The effect of the cooling structures’ geometric parameters on the eddy-current losses was discussed. The methods of reducing the eddy-current loss were proposed. The analysis results demonstrate that the optimization of the geometric parameters would greatly benefit the reduction of the eddy-current losses.
Research on an On-site Detection System of Electric Vehicle Charging Facilities
Authors: Liu Zisheng , Wang Ling , Zhao Shuaishuai , Yan Xiangwu
Published: August 2019

With the continuous development and promotion of electric vehicles, the safety and reliability of electric vehicle charging facilities are paid more attention. In order to serve users better, this paper analyzes the existing charging facilities and clarifies the technical requirements for on-site detection, and an on-site detection system of electric vehicle charging facilities is proposed based on the analysis. The practical application proves that the system can detect the electrical performance, protection characteristics and restriction characteristics effectively, which could provide reference for the operation and maintenance of the charging facilities.
Determination of the Most Energy-saving Traction Speed Based on UAS Simulation
Authors: Feng Jiahui , Zhou Hongyu , Shen Jun , Liu Cheng , Wang Qingyuan
Published: August 2019

During the operation of EMU, the power supply network will be cut off and the train power will be lost due to bad weather, high voltage cable dropping off, catenary failure and power supply system failure, which will cause the whole train line to be stopped and a large number of passengers to be detained, causing serious harm. Therefore, the Emergency Guidance (UAS) simulation software for EMU is developed based on the QT platform, and a lot of simulations are carried out under different initial battery power, different traction constant speed and different operation modes. Based on the simulation data, the main energy consumption models of trains and the models of total operation energy consumption and traction constant speed under time-first operation mode are established, which can be found from the models. The constant speed of traction with the least energy consumption can help the driver to drive energy-saving and reduce unnecessary energy consumption. Finally, the model is validated and evaluated, which can be well applied to general situations. The simulation has good application prospects in the construction of energy-saving intelligent high-speed railway in the future.