bluuebunny/crossref_metadata_2025 huggingface dataset:
Method of Measurement and Computing for Natural Gas Energy
Authors: Zhong Bing Xiang
Published: July 2014

Energy measurement and computing can directly reflect the value of natural gas. In our country the volume flow measurement and computing will be gradually replaced by energy measurement. In this paper the principle of energy metering of natural gas is introduced and the system of energy metering of natural gas is constructed. Based on GB/T 11062, computing method of gas energy is discussed, in which quality data of natural gas, temperature, flow, pressure parameters are measured by energy metering system and the calorific value of natural gas, relative density and Wobbe index are and computed. Also the uncertainty of and computing method for natural gas energy is analyzed in which uncertainty is within 0.1%. The results show that the uncertainty of the calorific value measurement system attained accuracy requirements of GB/T 18603-2001.
Power System Fault Diagnosis Based on Artificial Fish-Swarm Algorithm
Authors: Qu Tian Yi
Published: July 2014

The primary method of power system fault diagnosis is that the fault section estimation is demonstrated a 0-1 programming model according to the acting theory of protective relays. This paper proposed a kind improved artificial fish-swarm algorithm: binary artificial fish-swarm algorithm (BAFA) for this kind of problem. Forward speed of optimal direction between swarm-behavior and follow-behavior is analyzed and a comparative analysis is made with genetic algorithm (GA) on this basis. Results indicate that follow-behavior is superior to swarm-behavior on forward speed of optimal direction and BAFA is superior to GA on the comprehensive performance. Meanwhile, it is shown that BAFA has the fast convergence speed and better optimization ability.
Research on the Measurement of Household Appliance Impedance Characteristic
Authors: Wang Yi , Tang Han , Chen Wen Li , Hou Xing Zhe , Sun Hong Liang , Luo Kai Bo
Published: July 2014

Impedance of power line channel is the most important factor for power line communication. All kinds of household appliances randomly connect or disconnect from the network, which give rise to impedance variation on power line channel. The mismatch of impedance would reduce the performance of the signal transmission. The power network is mixed with lines and loads. In order to investigate the main factors that affect power network impedance, this paper proposed a method to measure the impedance of active household appliances. Some household appliances are measured with this method, and the result shows that this method can measure the impedance effictively, which helps the study on the impedance charicteristics.
Research on the Optimization Model of Fault Detection for Large-Scale Electronic Circuit
Authors: Feng Bao Zhen
Published: July 2014

In current large-scale electronic circuit devices, failure data calibration capacity is not strong and it is difficult to be precise classification and intelligent judgment. It lacks of the necessary mechanisms to eliminate the error message, bringing troubles to fault detection. In order to avoid the above defect, this paper presents a fault detection method for large-scale electronic circuit based on fuzzy clustering algorithm. Firstly, the use of means clustering method, the fault information is made initial classification. Then, using the second fuzzy clustering method make fault information filtering in different categories, in order to achieve the fault data confirmation. Experimental results show that the proposed algorithm can effectively improve the accuracy of fault detection of large-scale electronic circuit.
Research on the Winding Deformation Testing System for Transformers Based on the FRA
Authors: Zhang Zhong Yuan , Wang Yan Bo , Zhang Lin Kang
Published: July 2014

Short circuit currents or forces during transport can cause mechanical displacements of transformer windings. The transfer function method is presented as a tool to detect these displacements. In order to discover the hidden trouble of the transformer, in this paper, an on-line monitoring system based on FRA method is developed, the hardware performs the main functions: signal injection, filtering, amplifying, signal conditioning, and storing the result in computer. The software includes four modules: user login, data acquisition, data analysis, data query. Finally, the monitoring system is validated by a corresponding experimental study.
Study on a New Test and Diagnosis Method for Complex Integrated Circuit
Authors: Wang Xiu Fang , Peng Jin Ye , Chen Bin
Published: July 2014

Due to the problem that test signals is difficult to describe and analyze in the microprocessor (CPU) and digital signal processor (DSP) circuit, this paper come up with a matrix base method to describe program signal and instruction signal, thus in theory solve the above problem. In the proposed method, simple hardware circuits can be used to produce different test signal needed in the test and diagnose of CPU circuit.
The Analysis of Device Model in CMOS Integrated Temperature Sensor
Authors: Xiong Qi , Zhou Shao Hua , Zeng Jiang Ping
Published: July 2014

According to the requirement of the CMOS integrated temperature sensor on the device, we analyzed the sub-threshold model of MOS device and the bipolar device under MOS technology. We found the latter is more suitable for a components of CMOS integrated temperature sensor devices. Therefore, we analyzed the influence of the substrate PNP tube’s piezoelectric effect on temperature sensor and compared different types of resistance that lays a theoretical basis for the design of CMOS integrated temperature sensor.
The Design and Analysis of Substation Equipment Temperature Wireless Monitoring System
Authors: Wei Na
Published: July 2014

The power equipment temperature monitoring within substation is one of the indicators to raise the capacity of power equipment management. From the perspective of wireless monitoring, this paper analyzed the main principles of wireless temperature monitoring of current power equipment. And with technology, according to several defects, this paper put forward a way of data forwarding, management plan by combining wireless protocol ZigBee and cable transmission, analyzed temperature monitoring system from configuration of temperature sensor, wireless temperature node and center nodes, and software design process, and finally analyzed some of the key technologies implemented by temperature monitoring system, which has a certain guiding significance.
The Research on the Factory Accept Test Technology of Subsea PLET
Authors: Zhao Xiao Lei , Chu Le Ping , Guo Xing Wei , Yu Guo He , Chen Jin Yu
Published: July 2014

With the development of offshore oil and gas field enters into deep water constantly, subsea production system has become the main development mode in deep water development. Pipeline End Termination (PLET) is common facilities in subsea production system and is used to provide subsea tieback interface. An embedded type PLET has been adopted in Panyu 35-1/35-2 Gas field with the water depth of 194 to 338 m. Factory Accept Test (FAT) is very important for the subsea production facilities, and the references is very limited due to technical security. This paper in detail states the flow chart, master equipment, purpose and precautions for each test of FAT for PLET, which collects great technology for the development of subsea production system.
The Application of Wireless Sensor Networks in Power Engineering
Authors: Mu Rui Hui
Published: July 2014

The fast evolution of computer technology, sensor technology, MEMS and modern wireless communication technology has impelled development of wireless sensor networks. Wireless sensor networks are consist of a large number of nodes which can be capable of communicating, computing and cooperation in ad hoc model. In this paper, we study the application of wireless sensor networks in power engineering. A device for remote monitoring of electric towers is designed. This paper proposes the implementations of remote wireless centralized electricity meter reading based on wireless sensor network.
The Design of Location System for Single-Phase Grounded Fault in Distribution Network Based on Zero-Sequence Current
Authors: Cai Xin Wei , Jin Tao , Jia Hui Bin , Qi Yu Lin
Published: July 2014

In this paper, A location system for single phase grounded fault in distribution network is proposed and it is based on the phase of zero-sequence current. The system is composed of central station and nodes installed on the power line, and their functions are illustrated in this paper. The principle of the method is shown and experiments are carried out. The results show that the feasibility of the method. The advantage of this method is it’s short time to detect. The method is Applicable to detect the faulty segment for neutral point non-grounded system with grounded resistance less than 1kΩ.
The Identification Methods of Partial Discharge Test for Equipment
Authors: Wang Qing Hao , Lin Bin , Li Xin Yu , Li Jian Feng , Wang Qi , Zhang Jia Yan , Li Yan , Cheng Shuo , Zheng Ji Ming , Wang Xue
Published: July 2014

When the power transformer in partial discharge test, if the test equipment (voltage regulator, intermediate transformer, etc.) ontology partial discharge is big, it will severely affect the quality of testing, and even cause false identify.How to correctly identify partial discharge from the power transformer or from the test equipment itself, it is very important for the test personnel. This paper introduces to use the idle 220kV circuit breaker in parallel capacitor to cleverly find out in the whole process of partial discharge from the test equipment itself.
Design and Construction of Railway Cracks Detection Based on Eddy Current
Authors: Sheng Yan , Zou Xuan
Published: July 2014

This paper aims to detect cracks on the rail head via eddy current and show their locations. The combination with mechanical and electronic devices is approached by modeling and analysis. Based on eddy current technology, voltage difference replaces phase shift and the amplification is gained by a triode differential amplifier. It realizes inspection of cracks. Being operated with an incremental optical encoder, Peripheral Interface Controllers and the Liquid Crystal Display, the distance measurement module records the defects. It is applied with a small section of rail tracks.
A Novel Testing Method of Low Voltage Fuel Cell
Authors: Wu Jiang , Wu Chao Qun , Wan Li , Liu Zhao Qing , Wang San Wu
Published: July 2014

Expensive special equipments are often employed to evaluate the performance of low voltage battery, because of the loss voltage of test terminal and line. In the present paper, an economic method was proposed to evaluate fuel cell performance using the booster power supply and electronic load with remote sense. The testing method was deduced theoretically and applied to study the performance of the direct methanol fuel cell . According to the results, it was found that the method was economic applicable and feasible.
Design of Switch Transformer about Half Bridge Switching Power Supply
Authors: Tang Yu , Wu Gang
Published: July 2014

Half bridge switching power supply is a kind of form in the family. It has the characteristics of good voltage output, high efficiency, the simple circuit and so on. On the design of the half bridge switching power supply, the key and difficult point is the design of switch transformer. Taking the switch transformer of a half bridge switching power supply as the research object and based on the design requirements, this paper aims to realize the calculation of the coil turns and the selection of core in switching transformer. the design of switch transformer of the push-pull switch power supply has been completed by circuit simulation and implementation.
An Energy Optimization Management Method of the Microgrid Based on Priority Ranking
Authors: Yu Qin Zheng , Zhao Dong Mei
Published: July 2014

Energy optimization management can realize optimal operation of the microgrid, to meet the requirements of economic operation, power supply reliability and environmental benefit, etcetera. Artificial intelligent algorithms are most widely used to solve this problem currently. In order to avoid the weaknesses of intelligent algorithms, this paper puts forward a simple and practical method based on priority ranking. A energy optimization management model of a grid-connected microgrid is established. Using the priority ranking method, optimal operation schemes under different optimization strategies are figured out. The analysis and discussion of optimal operation schemes and the comparison with the optimization result of particle swarm optimization (PSO) indicate that the method based on priority ranking is simple, effective and practical.
Effect of Frequency and Boost on the Breakdown of XLPE Cable with Inserted Needle Defects
Authors: Li Wei Wei , Shi Qiang
Published: July 2014

Cross-linked polyethylene cables are widely used in power transmission system. In this work the effect of frequency and boost on the breakdown performance of XLPE cable with inserted needle defects was investigated by the frequency-tund resonant system with frequency ranging from 20Hz to 300Hz. The breakdown paths were observed by an optical microscope, and the fractal dimensions of the paths were estimated according to box-counting method. It was found that, with the increase of frequency, the variation of path fractal dimension as a function of frequency corresponded to that of breakdown voltage. Compared with the continuous boost method, the frequency, at which the fractal dimension of breakdown paths approached saturation and the breakdown voltage peaked, became lower under step test method. The increase of breakdown voltage is due to the increase of electrical power used for the initiation and development of dense discharge paths.
Error Calibration of Three-Phase Method for Combined Transformer
Authors: Ai Bing , Shi Qiang
Published: July 2014

Three-phase combined transformer has a large number of application to special energy metering in power grid, its performance is directly related to the accuracy of electric energy metering. So it is necessary to ensure its performance and accuracy. It rules that three-phase combined transformer should be calibrated with three-phase method, but most of metrology departments calibrate three-phase combined transformer in single-phase method. Based on the mechanism of the three-phase transformer, single-phase method and three-phase method had been compared on three-phase transformer experimental platform. The result shows that it would be large error when the three-phase transformers are calibrated with single-phase method. Three-phase transformer calibration should be operated with three-phase method.
Reform of Excitation System on the Domestic 600MW Subcritical Turbine Generator Unit
Authors: Han Zhi Ling
Published: July 2014

Analog Excitation regulation system is applied in No.3 turbine generator unit of Harbin No.3 power plant, Huadian Energy Group, and the system has several problems such as high failure rate, poor regulating performance and low level automation. As a solution, the static self-shunt excitation system is used to replace the analog excitation regulation system, UNITROL 5000 all-digital excitation system is adopted. With specific field situation, the paper introduces the structure and application of the system in details. Compared with the conventional A.C. exciting system, the all-digital excitation system has effectively improved the stability and reliability of the generator, with the advantages of more flexibility of the start-up modes and undisturbed switching. It is also reliable and convenient for the switching of PSS additional regulation unit.
Design of Economized Power Controller Based on Ethernet and Embedded Technology
Authors: Tu Jin Lu , Guo Yi
Published: July 2014

Embedded remote economized power controller based on Ethernetadopts uses the embedded technology to realize intelligent control. It cuts the TCP/IP protocol and realizes point-to-point communication through UDP hole punching technology.It goes beyond the LAN limit and follows the principle of energy conservation.This economized power controller has very high practical value.
A Cell Balancing System Based on Charge Shuttling Method
Authors: Zhu Yu Wei , Shi Bing
Published: July 2014

As one of the most essential part in a battery management system for a lithium battery, cell balancing determine its performance and lifetime. A new “flying capacitor” method is presented in this paper. Where, a clock-switched circuit changer matrix makes the charges flow from the high-voltage cells to the low-voltage cells. Some super-capacitors buffer the charge and redistribute energy of the cells in the battery. The implementation is also low-cost and its design period is short. The result shows that the method is feasible.
A High Frequency Strictly Passive Model for Transformer Based on the Image Method under Lightning Overvoltage
Authors: Zhang Zhong Yuan , Gao Li Ming , Zhu Rui Min
Published: July 2014

In the power system electromagnetic transient simulation, the establishment of a stable power transformer simulation model is crucial. Therefore, the high frequency strictly passive model of the transformer is investigated, which is suitable for the lightning strokes. The proposed model is introduced based on two-port network theory where its scattering parameters are measured through network analyzer firstly, and then the scattering parameters are transformed into the impedance parameters, finally the transformer T-equivalent circuit is established. The image method is used to fit frequency dependent impedance parameter, and according to different types of the parameter, the combination of circuit elements R, L, C is needed. By using the image method the values of the elements achieved are all positive and the strictly passive conditions of the circuits are guaranteed. Furthermore, the experiment and simulation results of a 10kV single-phase transformer under lightning overvoltage is presented, confirming the validity of the proposed method.
Analysis of New Deceleration Strip Device to Generate Electricity
Authors: Xu Dong Dong
Published: July 2014

To solve the problem about vehicles passing deceleration strip consumming a large amount of energy , it can improve the efficiency of the deceleration strip generating electricity by improving the existing mechanical power or gas-liquid pavement power transmission part,using the buffer device and conversion device to change the stress state of rack and pinion,combining the working characteristics of one-way clutch with bevel gear transmission characteristic.The result shows that the power generation device design is reasonable and the economical profit is remarkable.
A Research on Fixed Series Compensation
Authors: Qin Li Jun , Xiong Chao
Published: July 2014

Series compensation can improve the line efficiency significantly, reduce line loss and raise line voltage obviously. The paper introduces the basic principles of series compensation, and studies the influence of series compensation’s installation position on compensation effect, the loss reduction effect of series compensation as well as the influence of series compensation on power flow control.
A Research Summary on Combined Peaking Load Strategies of Nuclear Power Plant
Authors: Zhang Tao , Ma Xiao Dong , Zhu Yu , Wang Gang , Ye Peng
Published: July 2014

Based on extensive research, introduced the peak load regulation characteristics and capacity of different nuclear power plant (NPP) in this paper. The running mode of NPP participating in peak load regulation of power system, combined operation tactics of NPP with other peaking power source and synergistic scheduling of an integrated power generation system with wind, photovoltaic, energy storage unit and NPP were summarized, technology development trend of NPP participating in peak load regulation of power system was analyzed and forecasted.
Research on Frequency Electromagnetic Field of Parallel Transmission Line
Authors: Cao Hong Ying , Tang Bo , Peng You Xian , Li Yu , Chen Bin
Published: July 2014

At present the study mainly for frequency electromagnetic field which is based on a single transmission line meanwhile the value must be in line with the requirements of the workers in the country frequency electromagnetic field. However, for parallel transmission line the maximum of frequency electromagnetic field is still to meet the provisions of the state, therefore in this paper studied the parallel transmission lines. Taking the multiple parallel power lines of China Three Gorges University as an example, the values of electric and magnetic field are calculated and the electromagnetic field is measured based on National standards. Then, compare the measured value with theoretical value, verified the correctness of the superposition algorithm.
The Impact on the Electromagnetic Environment of Medium Wave Broadcasting Stations Caused by 110kV Power Lines
Authors: Wang Guan , Hu Hao , Yu Fei , Gong Yu , Jiang Wen Hua
Published: July 2014

In this paper, the numerical analysis methods of electromagnetic field is used and by establishing the computer model of 110kV high-voltage power line and medium wave amplitude modulated broadcasting (AM) stations, the impact on the electromagnetic environment of medium wave broadcasting stations caused by 110kV high-voltage power lines is analyzed.
Application of Wavelet Transform in Signal Compression and Signal Recombination
Authors: Wang Zhe Yuan , Jiang Li
Published: July 2014

This paper discusses the application of wavelet transform in signal compression and signal recombination detailedly. This paper briefly introduces the principle of wavelet transform in signal compression and signal recombination, this paper also introduces the wavelet MATLAB simulation experiments. This paper researches the differences the wavelet transform and wavelet packet transform in signal compression, this paper also briefly discusses the influence factors of signal compression.
Channel Estimation Algorithms for MB-OFDM Based UWB System
Authors: Yang Yi Huai , Shen Ming Xiu , Sun Yan Ping
Published: July 2014

To achieve an accurate channel impulse response (CIR) during channel equalization and coherent detection, the channel estimation plays an important role to the performance of system, especially the receiver. In this paper, we investigated two main kinds of channel estimation methods for MB-OFDM based UWB system. The performances are compared using MATLAB simulation. The simulation shows the NBIDCE algorithm has better performance for WBAN-based healthcare systems.
A Novel Method of Requirement Analysis for Power Communication Access Network
Authors: Feng Bao , Lin Yi Lei , Li Yang , Zhong Chang Qing , Liang Kai
Published: July 2014

With the development of smart grid technology, more and more intelligent devices and applications are accessed into the electric power system, which put forward higher requirements on network communication and monitoring. Power distribution and electricity utilization network directly facing the ultimate power users, is the embodiment of the smart grid in customer aspect. Flexible, efficient and reliable communication network will greatly improve the user experience. The network is commonly referred to as power communication access network. In order to improve the performance of service bearing network, a novel service driven modeling method for requirement analysis is proposed. Furthermore, the paper offers some recommendations for network design.
Application of Hall Effect in Semiconductor Material
Authors: Kang Shuai
Published: July 2014

As the unique properties of semiconductor material, it is made of many semiconductor Hall devices. Semiconductor Hall device has the advantages of simple structure, small volume, long service life, sensitive to magnetic field induction, strong frequency response and large variable voltage output. Hall Effect of semiconductor material is one kind of electromagnetic effects, which has practical significance. It is widely used in measurement technology, electronic technology, automation technology and so on.
Analysis Research of Power GIS Thematic Application Based on Web Services Technology
Authors: Chen Yong Hua , Zhang Mi Sha
Published: July 2014

Grid thematic map is an important basis for the current power grid planning and design, analysis the data characteristics of the power grid GIS thematic map data sources, by its data requirements, studied the method of integrating GIS and MIS heterogeneous data and analysis of data integration strategy of the established model based on Web Services, puts the dynamic generation of GIS grid thematic map in heterogeneous environment, proposed the Web Services data integration based on XML interface standard technical route, and finally achieves the design goal of GIS grid thematic map of dynamic analysis, provide auxiliary decision support platform for power grid planning and design.
Client-Side in Management System of Transmission Line Passage Protection Based on Android
Authors: Liu Bing Qi , Jiang Hui Lan , Wang Jing Peng
Published: July 2014

To overcome the shortcoming of lack of real-time in traditional latent troubles information management, a transmission line passage protection system (TLPPS) Android client-side is developed in this paper. Basing on Android mobile’s real-time communication and good development performance, Android client is used to record the information of latent trouble. Web Service is adopted to realize the wireless communication between client and server, then the real-time upload and updating is realized, thus improving the accuracy and making it possible for the administrator to put up with the advice of dealing with the latent trouble in time. The security of power system is guaranteed.
Analysis of Key Factors Affecting Double-Circuit Transmission Lines Parameters and Transposition Schemes
Authors: Ben Cheng , Li Zhen Xing , Xu Dan Feng , Wu Lin Juan
Published: July 2014

Double-circuit transmission lines parameters symmetry would affect the normal operation of the transmission lines and relay protection actions directly. This paper analyzes the impacts of three different phase sequence arrangements on parameters symmetry of conventional un-transposed double-circuit lines, and requirements can be met by the parameters symmetry for double-circuit transmission lines with different types and different length. Took practical engineering requirements into consideration, a simple and admissible suggestion on phase sequence arrangements and the transposition modes is given. The research results provide useful guidance and reference for future designs of double-circuit lines, especially for the compact one.
Analysis of Live Working Safety Distance for 750kV Double Circuit Transmission Line in Different Altitude Areas
Authors: Sun Hui , Ding Yu Jian , Xie Qing
Published: July 2014

In order to determine the required live working safety distance for 750kV double circuit transmission line in different altitude areas of China, by using the test data of 750kV double circuit transmission line in the low altitude areas, and combining the common altitude correction methods, the live working safety distances of different altitude correction methods are obtained. By comparing and analyzing the results of different analysis methods, the required minimum approach distances and minimum combined gap distances of live working are recommended under different working conditions in the altitude of 1000m ~ 5000m areas. The results could provide technical reference for 750kV double circuit transmission line in different altitude areas.
Analysis on Capacity of Transmission Line Based on Thermal Rating
Authors: Yang Bo , Wu Kui Hua , Wang Yi Qun , Yang Shen Quan
Published: July 2014

The rapid growth of power grid load put forward higher requirements on the transmission capacity of line, with the growing tension of line corridors, building new transmission lines is becoming more and more difficult. Therefore, it is of realistic significance to analyze the transmission capacity of existing transmission line and fully tap the existing power grid transmission capacity. On the basis of previous studies, and consulting a large number of references, this paper summarizes and expounds the methods of improving transmission capacity by using the thermal rating analysis, introducing static thermal rating and real-time static thermal rating. Also, this paper verifies applications of the above methods in actual running environment.
Benefits Analysis of Energy Tax Reform
Authors: Ma Jian , Song Yang , Ji Liu He
Published: July 2014

Sustainable economic growth of a country needs support from energy industry. The limitation and environmental problems caused by energy makes the governments to re-examine their energy strategies. As an important tool for national macro-control, tax policy has an irreplaceable role on the promotion of conventional energy conservation, sustainable use and introduction of new energy sources. More and more theories and practices have proved that the energy tax is beneficial to conservation and utilization of energy. At present, China has yet to levy a special energy tax. There are many problems in energy taxes, so we have to reform our current energy taxes. Evaluation of the effect of the reforms can be judged in many ways. In this article, we will analyze it from a social welfare perspective, trying to build an optimization of the energy tax system in order to achieve social welfare maximization.
Considering the Wire Erecting Model of Transmission Grid Planning under the Market Environment
Authors: Yang Shen Quan , Hu Xing Wang , Zhang Xiao Lei , Wu Kui Hua , Yang Bo
Published: July 2014

Electricity market reform has brought new challenges to transmission grid planning, the traditional only considers a future scenarios of transmission grid planning, this method can’t meet the actual needs. In this paper, the uncertainty factors of market environment is analyzed, based on the relaxation factor and the way of wiring ,the transmission grid planning model is established. The security not only takes the N-1 breaking cases into account, but also includes the same tower Multiple-loop breaking at the same time. The model is solved using the methods based on Monte Carlo simulation and hierarchical genetic algorithm, ultimately the resulting meets reliability requirements and minimum total cost of transmission planning programmes under the future uncertainty environment. To build the simulation model, simulating the different methods of wiring way impacts on the investment and risk of the grid planning.
Fault-Tree Analysis for Power Gird Emergency Logistics System under Large-Scale Natural Disaster
Authors: Yu Feng , Li Xiang Yang , Yue Guo Jun
Published: July 2014

Power grid, one of the critical infrastructures, is a vital component of the world’s energy supply. Once large-scale natural disaster occurs, it is inevitable to meet unexpected faults on emergency logistic. Fault-tree analysis (FTA) is a risk estimation tool to describe and model causal interactions and logical relationships between undesired events in a system Taking uncertain situation and response failure into consideration, this paper proposed a fault-tree analysis on PG-ELS with fuzzy probabilistic confidence. The most critical failure mode is identified using the ranking method based on interval number.
Features and Application Analysis of Advanced Small Nuclear Power Reactors
Authors: Xiong Wen Bin , Zhang Hou Ming , Zhang Bo Ping , Li Hu Wei , Wang Gang , Zhu Jie
Published: July 2014

In recent years, advanced small nuclear power reactors, namely small modular reactors (SMRs), gained widespread attention. In areas where energy can’t be provided by large scale reactors and the nuclear power plants with large scale reactors can’t compete with the non-nuclear power plant technology, SMRs, as a versatile distributed integrated energy source, which result in expanding peaceful applications of nuclear energy, have enormous potential. This article describes the characteristics and analyzes prospects and challenges of SMRs.
Grounding Method and Protection of Low Voltage Multiple Generators
Authors: Guo Bin , Liu Hui
Published: July 2014

This paper focuses onproper grounding practicesandgrounding fault protectionfor low voltage generators in island mode. The paper presents the fundamentals of power system grounding and requirements of IEEE with respect to grounding, the need for low voltage ground fault protection and implement is execution. The paper outlines the solid grounding method is used and necessary grounding fault protection for multiple generators in low voltage system.
Method Based on Multi-Attribute Decision Making of Receiving-End Power Grid DC Location Selection
Authors: Liu Xiao Ming , Niu Xin Sheng , Wang Yuan , Wang Yi Qun , Wu Kui Hua , Lan Feng , Li Li Sheng , Zhang Tian Bao
Published: July 2014

For Receiving-end AC system, DC location selection depends on its role in supporting the DC system and economy. This paper proposes a method based on multi-attribute decision making of receiving-end power grid DC location selection. First, the balance of power DC location selected by region; then select the optimal placement through multi-attribute decision making; finally checked by calculating the feasibility of the selected placement. Zha Lute DC Shandong receiving-end power grid placement choice proved the effectiveness of the proposed method.
Optimal Energy Management for Smart Distribution Grid Based on Virtual Power Plant
Authors: Meng Shao Xin , Bai Hao , Wang Yu Li
Published: July 2014

Virtual Power Plant (VPP) technology can take advantage of interactive communication and energy management system to optimize and coordinate the control of distributed generation, controllable load, energy storage device, so as to integrate them and participate in the energy exchange of the grid and the quote trading of power market. This paper is devoted to study the energy management system in virtual power plant. Under the day-ahead market ,this project puts forward the maximum profit model, analyzes the operation condition of various elements in virtual power plant, and set restrictions for its operation and energy storage; According to the randomness of the energy resources such as wind and light in actual operation as well as the price in power market, the change of power grid load and electricity demand, and the fluctuations in the retail price of electricity, this paper adopts the proposed model of optimal allocation to coordinate and optimize the configuration of the elements in virtual power plant.
Research on Characteristics of Partial Discharge in Typical Defects of High-Voltage XLPE Cable
Authors: Wang Yu Li , Zhao Jian Kang , Xia Rong
Published: July 2014

Six models of typical insulation defects are designed and lab-simulated system used for partial discharge (PD) detection of cables and accessories has been constructed to study PD characteristics of internal insulation defects in 110 kV XLPE cable system. By employing CPDM, a kind of on-line PD detector, test data of various models including related PD diagrams are obtained for our research. Based on these characteristic parameters, discharge characteristic analyses of a single PD pulse are presented and statistical operators can be obtained by numerical calculation. The experimental results show that CPDM on-line detecting method is effective for detecting PD signals from internal defects of cable accessories. In addition, there are significant differences in the some statistical parameters (e.g. discharge phase, discharge repetition rate, etc) and characteristic parameters of time-domain PD waveform which can be used as reference points for PD patterns identification in future research.
Smart Grid and its Application
Authors: Li Yu Wei
Published: July 2014

Smart grid could meet the electricity demand against the rapid development of economy and society. The idea to implement smart grid is fully in accordance with the energy developing strategy and it will exert far-reaching impact on the adjustment of energy structure, the sustainable development of society as well as low-carbon economy. Currently, smart grid has attracted wide attention around the world and major countries in the world have been carrying out related researches. This paper describes the background and basic concepts of the smart grid, and takes the United States, European Union and China for example to introduce the development characteristics and typical projects. Besides, this paper analyzes and compares the smart grid in U.S., E.U. and China and gives related suggestions on the key issues of the development of smart grid in China.
Study for Wind Farm Power Quality Based on Wind Turbine’s Characteristic Parameters
Authors: Zhao Kuo , Zhang Yi Bin , Wang Ya Guang
Published: July 2014

The grid-connected wind farms bring power quality problems to power system due to the volatility and random of wind power generation. Analysis and calculation are carried out in this paper for the main influence factors of wind power harmonics, voltage fluctuations and flicker, and the assessment methods of the above power quality problems. For a certain wind farm, the corresponding power quality index limits can be calculated. Assessment conclusions can also be given by comparing the calculated power quality index values and the index limits.
Sustained Overvoltage Control Considering Power System Restoration Dynamic Process
Authors: Chen Bin , Wang Hong Tao , Wei Zhong Kang , Wang Chun Yi
Published: July 2014

Changeable sensitivity and safety margin are proposed in this paper, which can avoid the voltage violation according to the operation of the current situation. A simulation test is presented to demonstrate the proposed method can decrease adjusting amounts and restoration time efficiently.
The Application of Cluster Analysis Algorithm in the Indicators Comparison of Grid Enterprise
Authors: Xue Wan Lei , Lu Kuan , Zhao Xin , Liu Xiao Li , Xu Nan , Wei Yang
Published: July 2014

This paper focuses on the application of cluster analysis algorithm in the indicators comparison of power industry. The provincial power companies are classified by the power supply quality indicator with K-means clustering algorithm to identify the standard companies and to verify the feasibility and effectiveness of the algorithm. The results show that the cluster analysis enable the power companies to accurately identify the gap between the enterprise and the benchmark of industry, so as to continuously improve the level of management and benefit.
CLC number:TM715
The Data Planning Methodology Researching on the Construction of Nuclear Plant Engineering
Authors: Zhu Xiao Ling , Wang Zhi Jun , Chen Pan
Published: July 2014

Data plays more and more important roles in the AEC field, especially in Nuclear power plant constructing and engineering. In this paper, except introduce the basic DP theory and methodology, we analyzed the key points while doing the DP in nuclear power plant. Based on the analyzed results, which is an actuality of Nuclear power engineering, the paper proposed the ways to improve the data integration solution to standardize the data of project data, reduce the redundant data in the database and improve the system integration efficiency.
The Energy Management of Chinese Tourist Hotel under the Background of Low-Carbon Economy
Authors: Liu Fei Long
Published: July 2014

Tourist hotel is a “high energy consumption high emission high pollution” industry. So it is of great realistic significance of strengthening Chinese tourist hotel energy management under the background of low carbon economy. Aiming at the main problems of energy management of Chinese tourist hotel, we should begin from the following several aspects: First,To establish a scientific concept of hotel energy management and combine energy management training and assessment closely;The second is to build and improve energy management system and strengthen scientific and effective implement;The third is to establish a sound mechanism of hotel computer remote monitoring system to achieve hotel energy management information and automation.
The Influence of Wind Power Grid to Power System Small Disturbance Stability Study
Authors: Wang Zhi Jie , Liu San Ming , Xi Pan , Pei Ze Yang , Su Xin Xia , Chen Li Juan
Published: July 2014

Setting up a practical power system containing wind farm small disturbance stability mathematical model, and the linearized equation of wind turbines and original equations of linear system, power system containing wind turbines augmented state formation matrix, turn the inverse iteration with PSASP software Rayleigh (Rayleigh quotient iterative algorithm and sparse matrix technique for large state matrix eigenvalues. In this paper, the Inner Mongolia power grid, wind power access to power system oscillation mode and the influence of the oscillation characteristics and meet the requirements of small disturbance stability of wind scale and operation control scheme. The influence of the wind farm is proposed for power system damping characteristics will not greater than the same capacity of synchronous generator's point of view.
The Numerical Research on the Jumping Induced by the Uniform and Non-Uniform Ice-Shedding of Transmission Lines
Authors: Wei Yi Zhen , Su Pan
Published: July 2014

This paper introduces several kinds of icing and ice-off simulation method: the equivalent load method, quality method, Támás model method and cell death method. With a large span cross section as an example, using finite element method, established the finite element model of single span icing wire, analyzed the non-uniform ice-off and the even ice-off,the results show that: Non-uniform ice-off dynamic tension is significantly smaller than even ice-off dynamic tension,the smallest dynamic tension is closely related to wire jump amplitude, the greater jump amplitude leads to the smaller dynamic tension,the essence of which is determined by the conductor slack.
The Research of Variable Speed Constant Frequency Wind Power Generation Technology
Authors: Fei Yuan , Liu Quan , Chen Yong
Published: July 2014

This paper briefly introduces the characteristics of wind power technology and its development process, Through data comparison, demonstrate the superiority of the variable speed wind turbine operation. In keeping the best tip speed ratio, the variable speed constant frequency control for the biggest wind power.
The Research of Wasting Wind Power and Methods of its Consumption Based on that of Fuxin
Authors: Shao Tian Long , Zhang Jian , Zhao Xu Nan
Published: July 2014

As a kind of renewable clean energy, the constant access of wind power to power grids is bound to have a great impact on the power system. Based on the grid structure in Fuxin, this paper will state the difficulty of peak regulation and the matter of wasting wind power caused by the large-scale wind power integration and put forward some reasonable methods for using the wasting wind power in the heating in winter. The relevant results indicate that capacity of local consumption of wasting wind power can be improved. Under the circumstances, it can be conductive to solve the problem of wasting wind power results from the difficulty of peak regulation as well as inspire the power system planners.
Using Fuzzy Synthetic Evaluation Model to Assess Technical Risk of China’s Alternative Fuel Vehicle Industry
Authors: Lin Jin Feng
Published: July 2014

The energy, which has a close bearing on the national economy and the people’s livelihood, is always a world-wide attention issues. To promote the development of alternative fuel vehicle, we have to break through many technical difficulties, at the same time, as one of strategic emerging industry, China's alternative fuel vehicle industry future development has a high degree of uncertainty, will face a lot of risks. In this paper, we set up an evaluation index system of those risks and use AHP method and Fuzzy Synthetic Evaluation Model to assess technical risk of China’s alternative fuel vehicle industry.
Summary on Wind Speed Distribution and its Parameter Estimation
Authors: Li Hui , Zhang Fang
Published: July 2014

The main objective of this paper is to review some models of medium-and-long-term wind speed distribution in wind farms, for example Gamma distribution, Log-normal distribution, Weibull distribution, Rayleigh distribution and Burr distribution. On the base of the Weibull distribution, some kinds of parameter estimation approaches are introduced. Meanwhile, the advantages and the disadvantages of various algorithms are analyzed and compared. The prospects of this research are put forward at the end of this paper.
Numerical Simulation on U(VI) in Uranium Tailing Impoundment Affected by Acid Rain
Authors: Ouyang Shuang Long , Li Shu Zhan , Zhou Shu Kui , Li Hua , Jiang Hai Hao , Deng Wen Jing
Published: July 2014

As acid rain getting more and more serious, increasing attention is given to environmental effect assessment of uranium tailings under the condition of acid rain. In the paper, influence of acid rain to partitioning coefficient (Kd) of U(VI) in soil was studied, and migration of radionuclide uranium in soil was simulated by computer. The static experiment results showed that the Kd value of U(VI) in soil reaches minimum value when pH is 2.0. When 2.0<pH<3.5, the Kd showed a rising tendency;The Kd in soil reaches maximum value when pH is 3.5. And when 3.5<pH<8.0, the Kd showed a decreasing tendency. This paper has taken a large uranium tailings impoundment in South China as an example studied by VisualModflow. After setting up models of groundwater movement and radionuclide migration in the study area, migration tendency of radionuclide U(VI) was simulated and pollution of radionuclide to environment was predicted. The results of simulation show that the migration of uranium speed to be the slowest when pH = 2.0, and the figure to be the fastest when pH = 3.5. Furthermore, maximum speed is about 1.24 times of minimum speed.
Experimental Investigation of Chemical Looping Combustion of CO with Fe-Based Oxygen Carrier
Authors: Li Qu , Lin Chang Feng , Zhang Jun Jiao , Cheng Wei Liang , Qin Wu
Published: July 2014

Reaction activities of Ni-doped and Cu-doped Fe2O3 oxygen carriers (OCs) with CO were investigated using thermo gravimetric (TG-DTG).The structures of the prepared OC were characterized by X-ray diffract meter (XRD).TG-DTG investigations indicated that rational Ni and Cu doping could efficiently enhance the reactivity of Fe-base oxygen carrier for oxidizing CO under different conditions. And Fe-based OC doped with 20 wt. % Ni can realize the highest reactivity.
Research on Reservoir Characteristics in San Zhao Peripheral Zone
Authors: Fei Sun , Qin Qiu Han , Zhou Sheng Hao , Peng Li
Published: July 2014

Using a large number of core, logging and seismic data, on the basis of sequence stratigraphy, reservoir geology, sedimentology, such as theory, the San Zhao peripheral zone were studied. FuYu reservoir is studied and Yang DaChengZi reservoir structure of reservoir. Based on coring well cores observation and rock thin section, casting thin sections and scanning electron microscopy (sem) analysis techniques, such as the SQ3–Y1 a sedimentary period main sedimentary, main lithological types, and different oil reservoir is studied.
Study on Coal’s Green Mining Technology Roadmap of Jurassic Coalfield in Northern Shaanxi
Authors: Zhang Wei , Zhang Jin Suo , Xu Jian
Published: July 2014

Jurassic coalfield in northern Shaanxi is a typical ecologically fragile area. In recent years, with the rapid development of coal mining industry in this area, the environmental problems were caused by coal mining have become so serious that threat seriously to the sustainable development of northern Shaanxi. In this paper, the research team use multi-round expert seminar to design a coal’s green mining technology roadmap (CGM-TRM) for Jurassic coalfield of northern Shaanxi, which will provide a macro guidance for related government, institutions and enterprises, and produce wide range of utility in relevant R&D activity.