bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance and Emission Evaluation of a Diesel Engine Fuelled with Cashew Nut Shell Oil Blends
Authors: Santhanakrishnan S. , Jose S.
Published: July 2014

This paper presents the properties and application of cashew nut shell oil as blend component for diesel in compression ignition engine. Experimental tests were carried out in a single cylinder, four stroke, direct injection, compression ignition engine fueled with cashew nut shell oil blends. During the experiments, the performance and emission characteristics of the diesel engine was analyzed and compared with the neat diesel fuel performance.
Effect of Combustion Chamber Geometry on Performance and Emission Characteristics of a Diesel Engine Fueled with Mahua Biodiesel Blends
Authors: Saravanakumar L. , Bapu B.R. Ramesh , Durga Prasad B.
Published: July 2014

The present work investigates the effect of change in combustion chamber geometry on performance and emission characteristics of single cylinder diesel engine fuelled with mahua biodiesel. Since plant oil derived from the mahua tree has high fatty acids, it undergoes esterification followed by transesterification process to reduce its viscosity. Experiments were conducted using a blend of 20% biodiesel (B20) 40% biodiesel (B40) with diesel and compared with diesel by using two types of combustion chamber geometry, explicitly hemispherical and modified hemispherical combustion chamber. Performance parameters such as Brake Thermal Efficiency (BTE), Brake Specific Fuel Consumption (BSFC) and emission parameters like Unburned Hydro Carbon (UBHC), Oxides of Nitrogen (NOx) were studied from the diesel engine with above mentioned configurations. It is obvious that there is considerable improvement in the performance parameter viz, BTE, BSFC and reduction in UBHC emissions by using the modified geometry piston. However, the NOx emission was found to be higher than that of standard configuration. The results obtained from the blend B20 at modified combustion chamber geometry are on par with diesel and hence mahua biodiesel can be suggested as an alternative fuel for Compression Ignition (C.I) engine with modified combustion chamber geometry.
Preparation, Characterization and Engine Performance Characteristics of Used Cooking Sunflower Oil Based Bio-Fuels for a Diesel Engine
Authors: Karthikumar Sankar , Ragavanandham V. , Kanagaraj S. , Manikumar R. , Asha A. , Achary Anant
Published: July 2014

This paper deals on bio-fuel, consisting of used sunflower oil and transesterified - used sunflower oil blended with diesel. They are prepared and tested as a fuel in a direct injection (DI) single cylinder four stroke diesel engine. The main fuel properties of these fuels are measured, the engine performance characteristics are investigated and compared with that of diesel fuel. Fuels are separately prepared, blended and tested for determining the characteristics and combustion in a single cylinder diesel engine. The main fuel properties such as the specific gravity, density, flash and fire points of the blended fuels are measured. The engine performance is investigated and compared with that of diesel fuel. The experimental results showed that the specific gravity of the hybrid bio-fuels is decreased and close to that of diesel fuel. The experimental results also showed that the engine efficiency is closer to the values obtained from the diesel fuel. It is found that among the various blends, transesterifed used sunflower oil with diesel, gives better efficiency. In addition it is found that, the blend of diesel with used sunflower oil gives the lowest fuel consumption as compared to that of other blended fuels.
Nomenclatures
w1 - weight of specific gravity bottle (g)
w2 - weight of specific gravity bottle + water (g)
w3 - weight of specific gravity bottle + sample (g)
Review Study on Spray Cone Angle in Diesel Engine Fuelled with Biodiesel and its Derivatives
Authors: Vivek R. , Raghu P. , Pitchandi K. , Nallusamy N.
Published: July 2014

— There are so many articles related to the review on diesel and biodiesel such as edible and inedible vegetable oils, performance and exhaust emissions of diesel engine fuelled with biodiesel oil and its derivatives. Spray characteristics was not considered in those reviews. In this study spray characteristics in diesel engine fuelled with biodiesel oil and its derivatives and diesel will be reviewed. Edible vegetable oils, soybean oil and rapeseed oil were mainly investigated. Inedible jatropha oil, used frying oil and palm oil was investigated in diesel engine. Spray cone angle were examined among the macroscopic spray characteristics.
Effect of Compression Ratio on Performance of a Four-Stroke Spark-Ignition Engine - A Theoretical and Experimental Study
Authors: Vijayashree Vijayashree , Tamil Porai P. , Mahalakshmi N.V. , Ganesan V.
Published: July 2014

Researchers strive to improve the performance characteristics such as power, thermal efficiency, mean effective pressure etc. of automotive engines. As the emission norms are becoming stringent day by day, the car manufacturers try their best to decrease the emissions and improve the performance without major compromise on performance. Improvements in the performance of an engine are can be achieved by increasing the compression ratio below detonating values. In this study influence of compression ratio on cylinder peak pressure, power, efficiency, and work for a four-stroke spark-ignition engine is reported. Both experimental and theoretical studies have been undertaken. Theoretical work is carried out using thermodynamic modelling techniques. Compression ratios ranging between 6.3 and 10.3 are considered in the speed range of 1200 and 2800 rpm. Experiments have been carried out on a single cylinder engine for a compression of 8.3 over the above speed range. The investigation is carried out particularly at such low speeds since in city driving the vehicles run only at part throttle in the above range of engine speed. The general conclusion is that the increase in compression ratio increases the performance.
Virtual Instrumentation Based Analysis of Induction Motor
Authors: Abitha Memala W. , Rajini V.
Published: July 2014

The three phase induction motor is a popularly used machine in many of the industries, which is well known for its robustness, reliability, cost effectiveness, efficient and safe operation. The unnoticed manufacturing failure, mistakes during repair work, exceeding life time may be some of the causes of the induction motor failure, which may lead to the unknown shut down time of the industry. The condition monitoring plays important role as it has the influence on the production of materials and profit. In our work, the induction motor is modelled using stationary reference frame and analysed for single phasing stator fault. The techniques used in detecting the single phasing (open circuit) failures are Park’s vector approach and Fast Fourier Transform (FFT). Park’s vector approach is used for detecting the faults occurring at various phases and FFT is used for detecting the faults of the induction motor working under no load and varying loading conditions.
Synchro Phasor Measurement Based Fault Analysis of a Parallel Transmission Line
Authors: Miruthula D. , Rajeswari Ramachandran
Published: July 2014

This paper presents a new method to classify transmission line shunt faults and determine the fault location using phasor data of the transmission system. Most algorithms employed for analyzing fault data require that the fault type to be classified. The older fault-type classification algorithms are inefficient because they are not effective under certain operating conditions of the power system and may not be able to accurately select the faulted transmission line if the same fault recorder monitors multiple lines. An intelligent techniques described in this paper is used to precisely detect all ten types of shunt faults that may occur in an electric power transmission system (double-circuit transmission lines) with the help of data obtained from phasor measurement unit. This method is virtually independent of the mutual coupling effect caused by the adjacent parallel circuit and insensitive to the variation of source impedance. Thousands of fault simulations by MATLAB have proved the accuracy and effectiveness of the proposed algorithm. This paper includes the analysis of fault identification techniques using Artificial Neural Network and Adaptive Neuro-Fuzzy Inference System based protection schemes. The performances of the techniques are examined for different faults on the parallel transmission line and compared with the conventional relay scheme. The results obtained shows that ANFIS based fault identification gives better performance than other techniques.
Preparing Sodium Methoxide from Sodium Hydroxide by Reaction Coupling with Separation Processes
Authors: Xiong Meng , Wang Cheng Xi , Shao Dan Dan
Published: July 2014

Preparing sodium methoxide by reacting sodium hydroxide with methanol was investigated. The chemical equilibrium constant was small. Removing water out of the reaction phase could drive the reaction to produce more sodium methoxide. The experiments were carried out at different temperatures and 1 atm in semi-batch reactor by liquid evaporating to remove water. The effects of initial sodium hydroxide concentration and liquid evaporating speed were discussed. A mathematical model coupling reaction with separation processes was built and the predicted results by the model were in good agreement with experiment results. The model provides useful information for industrial simulation.
A Research on Superheater Mechanism Model of Intelligent Optimization Based on Spot Data
Authors: Liu Chang Liang , Ni Meng
Published: July 2014

In order to solve the problems of strong coupling and nonlinear parameters of superheater model, in this paper, we aimed at a 600MW subcritical drum boiler high temperature superheater as the object of study .On the basis of mechanism analysis and its dynamic characteristics I built a dynamic model of high superheater contains 9 typical working conditions .I optimized the model parameters by using field data. A continuous nonlinear model is obtained by curve fitting. The simulation results show that superheater model built by this method can better simulate the field characteristic. This model provides a reference design of automatic control system of main steam temperature .This paper aims to provide the basis for the application of advanced control algorithms in the field. Furthermore, this model can provide higher accuracy for on-site training to improve training effect.
Research and Simulation of Energy-Saving Hierarchical Design Model for Differentiate Architecture
Authors: Guo Hai Qing
Published: July 2014

Energy-saving hierarchical design model is established for differentiate architecture. From current status of China's construction, exploration research is established on energy-saving hierarchical design model of differentiate architecture to evaluate indicator system of energy-saving building. Availability of evaluation information in index system is low, so it is difficult to play the role of evaluation of building energy-efficiency. EHTV difference method is used to calculate and evaluate energy-saving design of hierarchical building, including: heat transfer indicator of building envelope targets, air conditioning and heating consumption, basis of EHTV indicators.
Active Control Model of Island Multiple Generators System
Authors: Bin Guo , Ji Luo
Published: July 2014

This paper focuses on selectingcontrol of parallel generator that ensures safety and efficiency operation in oil & gas offshore pipeline application. For island grid system, the advanced microcontroller based digital isochronous method of active load sharing is introduced. The programmable logic controller system is adapted to automatic load sharing.
An Energy-Saving Scheme of Motor Drive Systems Based on Ultracapacitors
Authors: An Qun Tao , Sun Li , Duan Ming Hang , Liu Rui Bo
Published: July 2014

In order to prevent DC link voltage pump during braking, a paralleled release circuit composed of chopper and resistor is often employed. As a result of energy waste on the resistor, the efficiency of the motor drive system is low in the case of frequent braking. To improve the efficiency, an energy-saving scheme of motor drive systems based on ultracapacitors is proposed in this paper. An energy storage system (ESS) paralleled with the DC link of the motor drive is adopted in the scheme, which is composed of a bidirectional DC-DC converter and ultracapacitors. The ESS can realize recycling of the braking energy. Compared with PWM rectifier, this scheme can avoid various technical requirements for grid-connected inverters.
Design and Test of the Control System for the Fast Disruption Mitigation Valve on J-TEXT
Authors: Wang Shen Yang , Chen Zhong Yong , Luo Yi Hui
Published: July 2014

Disruptions are highly undesired events during tokamak plasma discharge, and now massive gas injection (MGI) is the most promising technique mitigating all negative consequences of a disruption. A fast disruption mitigation valve has been designed and tested for J-TEXT tokamak based on eddy-current repulsion mechanism. In order to get the key operating parameters of the valve such as voltage and gas pressure in real time and to realize remote automatic control, a control system on LabVIEW software platform based on hardwires of sensors, relays, Advantech industrial computer and NI-6221 data acquisition card has also been designed. The experimental test results show that the control system works well.
Study on the Composite Insulator Material’s Characteristics under Artificial Corona Aging Condition
Authors: Yi Chun Fang , Chen Yi Xin , Liang Pei Song
Published: July 2014

The HTV SIR provided the superior hydrophobicity for the composite insulator. But it faces the aging problem more than the inorganics. Corona, as an inevitable influence factor in insulator’s operation, its effect to the material could not be ignored. The paper developed a multi needles to plate corona aging equipment, 1000 hours’ corona aging to the HTV SIR was done. The duration of corona aging effect was study by FTIR, SEM and volume resistivity-temperature character testing. Three testing methods from the aspect of material’s chemical, physical and electrical characters to evaluate the aging effect with time went on. It had good consistency in all three methods for HTV SIR’s corona aging evaluation.
Modeling and Simulation of UAV Electric Servo System
Authors: Zheng Xing
Published: July 2014

With the dynamic simulation tool of MATLAB named SIMULINK, modeling and simulation are made for a certain type of UAV electric servo system. Through detailed performance analysis of simulation results, the simulation experiment is confirmed to be accuracy.
Photovoltaic Grid-Connected Micro-Inverter Based on Self-Tuning Fuzzy-PI Controller
Authors: Liu Chang Liang , Zhang Hui Chao
Published: July 2014

This paper introduces a kind of grid-connected micro-inverter system. Photovoltaic micro-inverter system is a highly nonlinear and time-varying system. Compared to traditional linear control strategy, Fuzzy Controller has better robustness and stability in the changing or non-linear application. Matlab simulation model for current tracking PV Grid-connected Micro-inverter was completed based on the Fuzzy self-tuning PI controller and the control strategy was tested on the micro-inverter prototype. The resu1ts show that this control strategy can effectively reduce the tracking error of the net current, and improve the system’s dynamic response.
Research of a Robust Control for Electro Hydraulic Servo System
Authors: Tang Xiao Gang , Zhang Chao
Published: July 2014

In recent years, electro hydraulic servo systems are more and more widely used in the aerospace, manufacturing industry and the agricultural machinery. As a result, higher requirements are put forward for the performance and application environment, including better tracking precision and respond speed. Aiming at the shortcomings of conventional PID controller, such as the large overshoot, long transfer time and poor robustness performance, a robust control scheme with dual-loop structure is proposed in this paper. Simulation results show that better performances are acquired in the novel approach in contrast with the PID control scheme and the structure of the proposed scheme is simple and easy to implement.
Research of Chain-SVG PWM Modulation Strategy
Authors: Liu Lin , Wang Zhong Chu , Gu Chun Bo
Published: July 2014

With the rapid development of control theory and microprocessor, many new rectifier control strategy has been born. In current power system, the rapid development of full-control devices, the high application of converter makes the electricity demand is higher and higher. At the same time the increase of power grid users, also bring more harmonic wave pollution, noise and other problems. Therefore, in the field of researching on inverter control has attracted more attention of more people. In order to meet the capacity of switching devices and reduce the switching frequency, often adopts multilevel topology structure [1]. This page based on the cascaded multilevel based on SVG topology structure, analysis of PWM control method and put forward a simple and feasible PWM control method and improve the utilization rate of DC side.
Research on CNC AC Servo System Design and Parameters’ Tuning and Optimization
Authors: Han Xian Long , Zhang Yao Juan
Published: July 2014

In this paper, the tricyclic control block diagram for CNC AC servo system of three phase permanent magnet synchronous motor was established. And three loop PID controller tuning was analyzed. At the same time, this paper proposed the tuning tricyclic PID parameters adopting GISE. Then take the CNC milling machine for example, simulation tuning was conducted in MATLAB using GISE. The results show that the servo system is no overshoot, fast response and good stability. So GISE is more suitable for parameter’s optimization and tuning of permanent magnet synchronous motors’ AC position servo system.
Study on Optimal-Power Ratio Optimization of Automatic Transmission
Authors: Cao Feng Ping
Published: July 2014

Regards the compound auto transmission as the object of research, an optimal-power ratio optimization algorithm that takes into account the efficiency of CVT was presented in the paper. Firstly, the numerical models of drivetrain were established, which included the engine output torque model and the efficiency model of CVT. Then, the driving power was chosen as the dynamic target, and the optimized objective function was built. According to the requirement of shift gear, the ratio of shuttle transmission components was determined. Based on the Simulation X, the simulation car model with the compound auto transmission was design to confirm the validity and effectiveness of the proposed method.
VSC-HVDC Control Strategy Research and Simulation Analysis
Authors: Hu Yang , Li Hui Qi
Published: July 2014

With the development of high-power full-controlled power electronic devices based HVDC voltage source converter (VSC) and pulse width modulation (PWM) technology (VSC-H VDC) technology has become a reality. Currently VSC - HVDC technology in foreign countries in the theoretical study of the transition phase to the experimental system, while the domestic is just beginning, many of the basic theory and applications related to basic issues to be studied. In this paper, based on existing research, analyzes power VSC-HVDC system control strategy proposeddq0coordinates using a steady state model, and based on the model , designing the control program. Finally, to build a system using SIMULINK simulation model for a steady-state simulation analysis.
Advanced Metering Infrastructure and its Back Software Architecture for Future Power System
Authors: Kong Xiang Yu , Zeng Bo , Wang Kai , Zeng Yi , Yang Qun
Published: July 2014

Governments have become increasingly concerned about the development of the smart grid, and a series of smart grid demonstration projects have been started. Multi-levels common and integrated infrastructure architecture for smart grid demonstration project was proposed in the paper. The implementation and operation of its back office systems were presented, which include the design, development and deployment of network management system, meter data management system, load control systems, community level and home energy management system, and web portal. The integration between different parts and their managements were also were proposed.
Marine Fuel Boiler System Design Platform
Authors: Hou Ying Ying
Published: July 2014

This design platform consists of a computer control, signal interface and PLC or IPC and other components. Signal interface consists of analog and digital input and output board composition, these boards are equipped with signal conditioning and terminal board, the input and output to meet industry standards, can be directly connected with the actual computer control system, this article will focus on the signal interface.
Energy Saving Matching of Power Equipment for Four-Footed Robot Dog
Authors: Wang Jun , Hu Chuan , Zhang You Tong
Published: July 2014

To increase the flexibility performance of robot dog, dynamic performance matching of power equipment in four-footed robot dog is made. Demand for power and configure in robot dog power equipment is briefly analyzed, improved backward power match between gasoline and pump is presented, power and flow rate match between gasoline and pump is calculated, control strategy based on pump pressure feedback is applied into gasoline engine control in order to save energy. With experimental bench test, experimental results showed that energy saving matching of power equipment can meet the requirement of fast dynamic meditation for robot dog .
Research on Distributed Power Quality Monitoring System of Oilfield
Authors: Huang Meng Tao , Wang Hao
Published: July 2014

For the specific requirements of power quality in the process of oil exploration,this paper designs a distributed intelligent monitoring systems,including oilfield power quality monitoring center and single oil well monitoring terminal.Among them,Single well terminal hardware is composed of high precision meter chip ATT7022C and ARM9 processor, it can complete the accurate measurement of the electrical parameters.The monitoring center is designed with LabVIEW as the carrier of the power quality comprehensive platform.Using ethernet for data transmission between the terminal and monitoring center. The results show that the system is comprehensive, it can effectively detect multiple power quality parameters and harmonic variation of the grid side,and also can provide technical support for oilfield power quality monitorng automation.
Research on Intelligent Auxiliary Decision-Making System for Regional Power Grid Faults
Authors: Qin Li Jun , Wu Xiao Teng
Published: July 2014

. a secure and stable operation of power grid will provide critical assurance for sustainable development of society and economy. Through power grid dispatching auxiliary decision-making system, key information could be obtained from various information sources of the control center such as energy management system, security and stability control system and safety production information system. In case that accident occurs, this intelligent auxiliary decision-making system will provide full assistance to dispatcher with dealing with accidents by starting failure diagnosis function and producing project for coping with accidents. Accelerate transformation of accident handling style from empirical style to analytical and intelligent handling style to improve technical level of sensing of power grid operation status, risks assessment, failure diagnosis and dispatching.
Review of AGC and Primary Frequency Regulation
Authors: Sun Peng , Tang Xiao Jun , Wang Hao Huai , Zhong Wu Zhi , Wang Jian , Luo Hong Me
Published: July 2014

This paper introduces the current research status of primary frequency regulation and AGC control strategy. Firstly, some important parameters about primary frequency regulation are introduced. Secondly, describes the development on the theory of AGC. Thirdly, the basic concept of CPS and ACE were briefly described, and then the difference between CPS and former A1/A2 standard were compared. Finally, outlook on the coordination between AGC control strategies and primary frequency regulation.
Simulation on Superconducting Magnetic Energy Storage in a Grid-Connected Photovoltaic System
Authors: Xie Yang , Zhang Ming , Jiang Guo Zhong , Geng Peng , Yu Ke Xun
Published: July 2014

Photovoltaic (PV) generation is widely used to solve energy shortage and environment problem. Since the output current of the solar cell will change with the sunlight irradiation, the power of the solar cells are not stable, so there is a need of a storage equipment connected to the PV system. With the characteristics of high efficient energy storage and quick response of the power exchange, the superconducting magnetic energy storage (SMES) can be used to meet the balance between the grid and the PV. A SMES and PV subsystem are connected together with the DC bus, which have less power electronics elements and can control power quality efficiently than linked with the AC bus. This hybrid system is composed of a DC/AC converter on the grid side, a DC/DC converter with the PV arrays, and a DC chopper with the superconducting magnet. A detailed model of the hybrid system is built with MATLAB/SIMULINK. Simulation results with and without SMES connected to the grid-connected photovoltaic system are presented, compared, and analyzed. The results of simulation demonstrate that the SMES system can maintain the DC bus as a constant value which can contribute to the stability and reliability of the grid-connected PV system.
The Optimized Configuration Simulation of the Wind Turbine Control System Based on E-WT
Authors: Dai Chun Yan , Yuan Jian Hua , Zhang Fang Hu
Published: July 2014

This paper proposed, with the constant speed and variable pitch wind turbine as the research object, and E-Wind Turbine software as simulation platform, S7-1200 PLC as the master controller, the system control module were optimized for selection and configuration,thereby improving system performance and reducing design costs. Finally, in the STEP7 Basic V11 the modules which had been a good selection and configuration were connected, then to complete the configuration of communication, to verify the feasibility of communication and the effectiveness of the system optimize configuration when the wind turbine implemented the simulation in the E-WT platform.
Electron Mobility Model for Tensile Strained-Si(101)
Authors: Wang Jian An , Nan Meng , Hu Hui Yong , Zhang He Ming
Published: July 2014

Nowadays, the strained-Si technology has been used to maintain the momentum of semiconductor scaling due to its enhancement performance result from the higher mobility. In this paper, the influence of ionizing impurity scattering, acoustic phonon scattering and intervalley scattering to strained-Si (101) material is discussed.In addition, a calculation of the electron mobility in Strained-Si (101) material is made using the average momentum relaxation time method described in Ref [1]. The results show that the electron mobility increases gradually for both [001] and [100] orientations while for [010] orientation increases rapidly with the increasing Ge fraction x.[1]
Development of the Sphere-Toroidal Continuously Variable Transmission
Authors: Wang Shun Min , Li Zhuo , Wang Xin Yu , Li Xi Chao
Published: July 2014

This paper describes a new genre of Toroidal-CVT system, called the Sphere-Toroidal Continuously Variable Transmission (STCVT), which is derived from the half-toroidal traction drive (TCVT) and introduces its structure and working principle. The torque transfers from the input shaft to the cross-axle universal shaft coupling connected with the driven shaft. By discussing the difference between the torque-transfer, the paper will show the possibility of the application in the vehicle. To conclude, the system has the potential to implement infinite extension for the CVT theoretically.
Design of Control System for Oil and Gas Field Pipe Production Line
Authors: Ye Hao , Hou Yan , Wang Hong Yu , Cai Wen Long
Published: July 2014

Steel pipe for pipeline have to go through multiple procedure in the whole process, and steel pipe transportation problem exists between the various processes. According to the specific requirements of the workshop environment and control tasks, a new communication mode that use S7-300PLC as the control core, connect 8 DP substation, involve 1077 output and input dot was adopted in the whole system. In the automatic mode, requirements of the complex technological process were realized; shake hands work mode was adopted between the production; using the proximity switch completed the material length measurement; in the location of inconvenience sensor installation, adopted virtual sensor in positioning. The HMI software in PC was WinCC V7.0, and communicated with PLC by Ethernet.
Magnetic Field Analysis for the Dual-Stator Toroidal Motor with Hybrid Excitation
Authors: Liu Xin , Nie Ling , Zhou Shou Yong
Published: July 2014

A dual-stator toroidal motor with hybrid excitation was proposed and its structure and operating principal were introduced. The spiral currents of worm armature coils were resolved into two orthogonal components. The FEM analytic models for current components were built. Distributions of static magnetic field were simulated. Air gap flux density curves were obtained. The simulation results justify the rationality of the electromagnetic parameters of the motor. The research results are useful for analyzing electromagnetic characteristics of the motor, and offer meaningful instruction for further research and practical application of the novel motor.
The Constant Voltage Composite Control Method of the SVC with Unbalanced Load Compensation
Authors: Zhang Yun Shan , Pei Yu Jie , Xu Jian Guo , Gu Yao Ding , Dong Jun , Wang Shu Han
Published: July 2014

in practical application of SVC, unbalanced load system exists on many sites, and the voltage at system access point is required to meet the demand of power grid operation. This paper describes a SVC constant voltage control method for an unbalanced load system. the control algorithm controls the voltage at evaluation point to reach the preset range while compensating reactive power of unbalanced load system. the control method could compensate an unbalanced load system into a balanced system, at the same time, the voltage at access point could meet the demand of power grid operation. This control method is particularly applicable to reactive control requirements of steel mills, wind power, solar power grid systems. This algorithm has been applied in Lishizhai 66kV SVC Project in Fushun, inhibits three-phase unbalance of the grid, has achieved good compensation effect.
A Energy Saving Routing Algorithm Based on Shortest Path Tree
Authors: Wang Run Liu , Yi Yun Hui
Published: July 2014

The optimal energy saving routing algorithm proposed in this paper is based on the shortest path tree. This algorithm introduces the concept of node classification and builds the weight function based on link energy consumption factor, neighbor node’s residual energy factor and type weight and so on. It uses different weight factor according to different types of nodes, and finally generates the shortest path tree, all nodes send data to sink node along the shortest path tree. The simulation results show that the algorithm can prolong the network life time, balance energy consumption of each node, and reduce the average network delay.
Applications of Cloud Model Migration Particle Swarm Optimization and Gaussian Penalty Function in Reactive Power Optimization
Authors: Ma Qing , Long Zhi Jun , Deng Chang Hong , Li Miao , You Jia Bin , Xiao Yong
Published: July 2014

In order to cope with the defects of traditional particle swarm optimization (PSO) algorithm, such as its prematurity and deficiency in global optimization, a cloud model migration particle swarm optimization (CMMPSO) algorithm is proposed. Firstly, the X-condition generator based on Cloud model is introduced to adjust the inertia weights of particles; then migration action is implemented to lead the flight of global optimal particle. In allusion to the mixed integer programming problem of reactive power optimization, discrete variables are treated as continuous variables in early iterations, and a discretization operation based on Gaussian penalty function is conducted in later stages. Taking the minimum network loss and minimum voltage offset as objective functions, simulations of IEEE 30-bus system is performed to verify the feasibility and effectiveness of the proposed algorithm.
Research on Energy-Saving Algorithms with Migration Energy Consumption in Heterogeneous Cloud Environment
Authors: Yang Zhen Xing , Guo He , Yu Yu Long , Wang Yu Xin
Published: July 2014

Cloud computing is a new emerging paradigm which delivers an infrastructure, platform and software as services in a pay-as-you-go model. However, with the development of cloud computing, the large-scale data centers consume huge amounts of electrical energy resulting in high operational costs and environment problem. Nevertheless, existing energy-saving algorithms based on live migration don’t consider the migration energy consumption, and most of which are designed for homogeneous cloud environment. In this paper, we take the first step to model energy consumption in heterogeneous cloud environment with migration energy consumption. Based on this energy model, we design energy-saving Best fit decreasing (ESBFD) algorithm and energy-saving first fit decreasing (ESFFD) algorithm. We further provide results of several experiments using traces from PlanetLab in CloudSim. The experiments show that the proposed algorithms can effectively reduce the energy consumption of data center in the heterogeneous cloud environment compared to existing algorithms like NEA, DVFS, ST (Single Threshold) and DT (Double Threshold).
Wire Suspension System Based on Fault Tree Analysis Running Condition Assessment
Authors: Hao Bing , Zhi Li
Published: July 2014

Overhead transmission lines is an important part in the power system and the lifeblood of the transmission system.Important element of the transmission line conductor suspension system namely conductor and insulator, hardware.This paper, by using the fault tree analysis method, establishes the mathematical model of the transmission line conductor suspension system running condition assessment, reliably evaluates the running status of system, find out the weak links and the problems of the various parts, for the evaluation and maintenance of overhead transmission line provide theoretical support.
Parameters Optimization of LQR for Magnet Power Supply of Accelerator
Authors: Zhang Xin , Liu Min
Published: July 2014

Accelerator has been widely applied to high energy, low energy physics, Medical environmental and military fields, etc. The magnet power supply is one of the most important parts of the accelerator. At the beginning, the state-space model of the magnet power supply has been established by modern control theories. Then, the PSO algorithm has been used for the weight matrices optimization of LQR controller in order to ensure that the magnet power supply can provide a magnetic field quickly which the accelerator required. The experimental results indicate that the method that proposed in the paper can meet the requirements of fast output response of the system and each control index of the LQR controller is obviously superior to that by the traditional method.
Research of Pipeline Leak Eigenvector Extracting Based on Wavelet Packet
Authors: Liu Xiao Yun , Zhang Xiang Fen , Ma Yan , Yang Yan Qin
Published: July 2014

As an important part of pipeline safety, pipeline leak detection is usually done by extracting feature vectors of leakage signal. Many researchers used wavelet packet algorithm to extract feature vector, but because of mixing effects of wavelet packet, the acquired feature vector may be not accurate. To solve this problem, the authors propose an improved wavelet packet algorithm to extract the feature vector. The improved algorithm is different from the traditional algorithm in decomposition and reconstruction and the feature vector is constituted by three time-frequency domain parameters. A lot of experiments have been performed to extract feature vector based on the proposed algorithm, with the results showing that the proposed algorithm can overcome the mixing effects and accurately extract the feature vector.
New Research on Identification and Classification of Grid Power Quality Disturbances
Authors: Yang Ning Xia , Gong Mao Fa , Wang Xiao Fei , Ge Hui Ting , Lin Yu Qing , Liu Bing Qian , Qiu Feng
Published: July 2014

To improve accuracy and speed of recognising and classifying grid power quality disturbances, this paper presents a new method which combines complex wavelet transform and particle swarm optimization (PSO) neural network to identify and classify the disturbance . This method extract both amplitude-frequency and phase frequency information of the interference signal to make up for the lack of traditional wavelet transform which only extract the amplitude-frequency information. And on this basis, using particle swarm optimization, we seek the optimal solution of neural network weights and thresholds for the identification and classification of power quality. The MATLAB simulation result has verified the accuracy and rapidity of this method compared with the traditional method .
A Quick Detection Approach of Magnetic Iron Grade for Magnetite
Authors: Wang He Nan , Wang Li Jie , Wang He Bing , Men Guan Hua , Liu Ye , Liu Hong Yan
Published: July 2014

In order to achieve aims of rapid real-time monitoring iron grade during sales process or mineral processing for the iron ores, a quick detection approach to magnetic iron grade of magnetite based on electromagnetic induction is explored in the paper. Information acquisition head is focused on an iron grade sensor, and the iron grade sensor is made up of coil-windings with magnetite core. Information acquisition circuits are given adapting mode of the transformer bridge type rectifier, and construction of the head is designed and machined. Testing mechanism is analyzed from the angle of magnetic field analysis, and the magnetic field model is also built up. Furthermore, magnetic iron grade of some testing samples are measured by the detection device above. It is showed that when the grade range of the magnetic iron of magnetite is varied from 20% to 65.3%, deviation is lower than 1.0%. By research above, it is shown that the detection method of iron grade based on electromagnetic induction is feasible, and it is also significant for improving the total testing level of mineral processing fields.
Characteristic Analysis and Measurement of Dielectric Loss in Non-Linear Insulating Materials
Authors: Xia Rong
Published: July 2014

Non-linear insulating material is widely used in the insulations of XLPE cable terminations and stator windings insulation of electric machines, and has obvious capability to improve the distribution of electric field. Actually, the dielectric loss factor of non-linear insulating materials is not equal to the tanδ describing linear insulating materials, and depends on applied voltage and their structures. This paper firstly discusses the difference between ac loss characteristic of non-linear dielectrics and linear dielectrics and presents a kind model of non-linear composite material. Based on the model, specific characterization and measurement methods and their numeric simulation analysis are given. Finally, a measuring system for non-linear insulating materials based on digital measuring technology is presented.
Fault Diagnosis of Communication Equipment Based on Rough Set Theory
Authors: Zhao Hai Yan , Huang Lin Hao , Xie Zheng Xi , Wen Gu Sheng
Published: July 2014

According to the communication equipment fault characteristics of complexity, hierarchy, relevance, delay and uncertainty, the method of extracting diagnosis rules based on rough set is presented in order to obtain diagnostic decision rules with good adaptability and maximum matching capabilities. This method can process a large amount of fault data and it can reduce both attribute and attribute value.4 evaluations are selected to evaluate the effectiveness and reasonableness of decision rules, and finally core value table of decision rules which has a certain ability to adapt. Example shows that this method can remove noise in fault diagnosis sample, reduce the computation and improve the efficiency of diagnosis effectively.
Measurement on Gas Number Density Distribution by Tunable Diode Laser Absorption Spectroscopy
Authors: Zheng Hui Jie , Quan Wei
Published: July 2014

An experimental technique was designed to measure the gas number density distribution of alkali vapor by tunable diode laser absorption spectroscopy. The measurement method was developed by scanning multiple gas absorption lines and fitting the experiment data with Lorentz profile to obtain the density. A discretization strategy of the equation for absorption lines is also present here as well as a constrained liner least-square fitting method. A simulation model was set up to reconstruct the two-dimensional distribution of number density and the feasibility of the reconstruction was verified. In the end, this work demonstrates the calculation error of the acquired number density and the distribution. The results indicated that the error would be no more than 5% if the measurement error is less than 9%.
On a Method of Getting Test Data for Boundary Scan Interconnection Test in Multiple Scan Chains
Authors: Yin Xian Hua , Xu Cui Feng
Published: July 2014

The goal of this paper is to present a new innovative method of getting test data for boundary scan interconnection test in multiple scan chains, so to decrease the test time and increase the efficiency and reliability. Firstly, a new model of configuring and optimizing multiple scan chains is formed based on the researches on greedy strategy for configuring multiple scan chains for internal test and the sorting algorithm of single scan chain for Cluster test. Then, a method of establishing test project description file (TPDF) is presented in order to get the test data quickly and effectively. During the testing of two different boundary-scan circuit boards, all faults can be detected. Experiment results show that the expected objective is achieved.
Research on the Intelligent Monitoring System of Indoor Electrical Safety Based on the Internet of Things
Authors: Jiang Chen , Zhou Lei , Liu Xiao Ju , Xu Xiao Liang
Published: July 2014

This paper presents a set of schemes of centralized indoor electrical safety intelligent monitoring systems which are more intelligent, real-time and reliable based on the internet technology of things. Integrated use of wireless sensor networks, embedded microprocessor technology is realized. Hall sensor is used to collect the real-time current on the power grid. As well, This system utilizes the method of the subspace pattern recognition to identify electrical appliances and eliminate some safety risks of the domestic distribution network through the fault arc detection.
Windowed DFT Method for Frequency Measurement Involving Amplitude Modulation
Authors: Xue Hui , Li Hui Lan , Wang Jiang Bo , Tang Hong Wei
Published: July 2014

A windowed DFT method is proposed for power system frequency measurement involving amplitude modulation. First, an error analysis of conventional DFT based method considering amplitude modulation is given. Second, a noval a window DFT function is proposed method to eliminate these errors is given based on the relation among three consecutive DFT values. Due to its high precision and low required processing effort, the proposed algorithm is a good candidate for online frequency measurement.
The Field Test of High Voltage Cable Impedance Parameters
Authors: Chen Gang , Wang Qing Hao , Liu Guo Bin , Hai Tian Shu , Liu Bo , Li Yi Ran , Li Bo , Wang Lei , Huang Dong Wei , Zhao Chuan Zong
Published: July 2014

The cables in 66 kV and 220 kV systems are used in single-phase style, and it must be grounded between the cables. The connection ways between different lengths of cables are in different ways, thus, it may occur influence to circuit parameters, especially to zero sequence impedance. In order to clarify the situation from theory analysis to calculate impedance under all kinds of connection modes, the paper gives an actual cable measured value, and introduces the correct measuring method, together, points out the matters needing attention in the measurement.
The Present Situation and Progress of Vibration Environment Test Technology
Authors: Xing Yuan Ding , Qian Hai , Peng Ying Cheng , Zhu Bao Liang , Huang Meng
Published: July 2014

This paper reviews the research status of vibration environment test equipment and technology. The development of modern vibration measuring sensors, types, processing technology, structure principle and the main performance index of the sensor is made by brief introduction and analysis, the problems existing in the vibration environment test is pointed out, at the same time for their application in the field of modern industry be also made by corresponding introduction.
WAMS/PMU Data Pre-Processing and Compression
Authors: Hu Li Li , Niu Sheng Suo , Liang Zhi Rui
Published: July 2014

With the Wide Area Measurement applications, a large number of experimental PMU data was generated. In order to analyze, transmit and apply the data efficiently, by understanding the characteristics of the PMU data in this paper, pressing the data with the Waveform difference method, then using Huffman algorithm to compress the data. Compare the data pre-processing before and after, compression ratio has been further improved.
Based on Wireless Sensor Technology for Substation Equipment Temperature Monitoring System
Authors: Yu Zheng Zhi , Wei Cheng Ge , Li Zhi Gang , Yang Shi , Du Yu , Li Xian Feng
Published: July 2014

in view of the substation equipment temperature measuring work, the existence of low accuracy of temperature measurement, data real-time performance, large work volume on manual operation, the temperature of the wireless sensor monitoring technique, the 2.4 GHZ wireless network technology, build a wireless temperature monitoring system, substation equipment temperature and the temperature rise of accurate, reliable and real-time on-line monitoring. Real-time monitoring data, intuitive display are in tabular and graphical form. Have the equipment temperature measurement data, temperature change trend analysis, data query and management, over temperature alarm to remind, etc. Real-time temperature data can be convenient access to the substation set control center, to ensure safe and reliable operation of the transformer substation, for substation monitoring and maintenance of equipment operation to provide data support, effectively prevent substation equipment oxidation, burning and other accidents.
An Anti-Ribboning Method for Winder Based on Brushless DC Motor
Authors: Zhu Chen Hui , He Zhi Wei , Gao Ming Yu , Yang Yu Xiang
Published: July 2014

This paper is about how to design an improved anti-ribboning method for the winder system. The system is based on the principle of a brushless DC motor control, which constantly changes relative velocity between the grooved drum and the yarn bobbin. This in turn, causes the changing of the winding ratio value. Therefore, it will accomplish the anti-ribboning control. Compared with the traditional anti-ribboning methods, the improved method can save more mechanical components and maintenance costs. Also, this method can develop different programs for different yarns. Therefore, this method is more efficient and versatile.