bluuebunny/crossref_metadata_2025 huggingface dataset:
Performance Comparison of GA and PSO on Wind and Thermal Generation Dispatch
Authors: Dhayalini K. , Sathiyamoorthy S. , Rajan Christober Asir C.
Published: July 2014

Due to the enormous increase in the power system load the conventional power generation plants never satisfy the power demand. So the power generating sectors turn into renewable energy sources. Wind power is a promising renewable energy source. It is necessary to determine the optimal dispatch scheme that can integrate wind power reliably and efficiently. In this paper GA and PSO algorithm are used to perform ED considering wind power generation and valve effect of thermal unit. The proposed method is validated with three and six unit test system. The results show the performance comparison of the two methods for solving the wind thermal dispatch problem.
New Construction Methodology - A Strategic Approach of Financial and Market Feasibility for Geothermal Cogeneration Plant
Authors: Jose Prakash Arul , Prasanna Rajesh , Prakash Fleming
Published: July 2014

A
bstract
-While constructing the geothermal cogeneration plant the success of the projects depends upon its financial and market feasibility. A new optimization method is used to estimate financing requirements of investment projects will be presented, as well as a new method to predict the optimal year to sell the investment. A case study is used to illustrate the use of a model to assess the financial feasibility of a geothermal cogeneration plant. The conclusion is that Net Present value , Internal rate of Return and Modified Internal rate of Return should be used to assess financial feasibility of investment projects. In addition to calculating the financial feasibility criteria, assessment models should allow the user to perform sensitivity analysis, scenario analysis, and simulation to analyze risk associated with the investment project. Risk probability matrix is used to obtain the risk priority , which then continued with financial analysis for the feasibility study and also sensitivity analysis. The study shows that the parameter investment value will be increased when treatment is done on risk. Keywords: Financial and market feasibility, Geo thermal cogeneration plant, Environmental Aspects, Sensitivity analysis.
Nano Fluids for Improving Efficiency in Wind Turbine Cooling System
Authors: Raj C. P. Christin , Surendran S.A. Ananthapuri , Amjathkhan B. , Metilda J.Antony Baksi , Devaraj S.Eben , Aristotle Elango
Published: July 2014

In order to reduce the entry of moisture, salt, sand and other external contaminations into the nacelle and also to reduce the fan noise which reaches the exterior, in this work a study of an innovative cooling system for off-shore wind turbine has been carried out. The new cooling technique is based on the use of nanofluids (engineered colloidal suspensions of nanoparticles in a base fluid). Nanofluids allow to increase the thermal conductivity of fluids and so to reduce the heat exchange surface and the heat transfer fluid flow rate due to the increased heat capacity. To reduce the amount of nanofluids circulating in the cooling system, the performance of a two-stage cooling circuit has been investigated. The first circuit takes the heat out of the generator and of the accessories whereas the second circuit, coupled with the first via an heat exchanger, dissipates the heat into the ambient. For the second circuit two options have been investigated. In the first solution the waste heat is dispersed using the tower as dissipator whereas in the second option the waste heat is exchanged with a titanium heat exchanger using marine water as heat transfer fluid.Both solutions assure high efficiency of heat exchange, long technical life expectancy and limited maintenance requirements.Keywords: Wind turbine, nanofluid, cooling system.
Design Parameters Optimization and Theoretical Performance Analysis of Linear Fresnel Reflector Solar Concentrator with Multi Tube Absorber
Authors: Manikumar R. , Arasu A.Valan
Published: July 2014

Linear Fresnel reflector solar concentrator technology is similar to solar trough technology in which the sunlight is reflected by a series of mirrors onto an absorber tube, thus
linear F
resnel reflector solar concentrator
, is a linear line concentrator. The performance of the system depends on the design parameters, mass flow rate, etc. In the present work, by using MATLAB simulation program, a detailed design parameters analysis including the effect of variation in the height of the absorber, width of the absorber plane and the width of the reflector mirror elements on the concentration on the surface of the absorber plane has been made. The width of the absorber plane was investigated by using analytical and ray tracing technique
s
. Then, the optimized width of the absorber plane was used to design the absorber tubes. Also, detailed thermal performance analysis for the above design has been made. Results have been plotted graphically and discussed.
A Review on Signal Acquisition Methods for Tool Wear Monitoring in Turning Process
Authors: Rajeev D. , Dinakaran D. , Satishkumar Shanmugam , Lenin Anselm W.A.
Published: July 2014

On-line monitoring of tool wear in turning is vital to increase machine utilization as scrapped components, machine tool breakage and unscheduled downtime result from worn tool usage cause huge economic loss. Several techniques have been developed for monitoring wear levels on the cutting tool on-line. Keeping in to account the difficulties encountered during the implementation of tool condition monitoring (TCM). The signal acquisition is one of the key elements used during the implementation of TCM. This paper provides an in depth coverage of various signal acquisition methods used in TCM.
Design and Development of Electronic Fuel Injection System for Vegetable Methyl Ester Operated DI CI Engine
Authors: Senthil Ramalingam , Paramasivam C. , Rajendran Silambarasan
Published: July 2014

The methyl esters of vegetable oils known as biodiesel are fetching more and more attraction because of the low environmental impact and potential as a green alternative fuel for diesel engine and they would not require significant modification of existing engine. Methyl esters of Jatropha (JME) are derived through transesterification process. Experimental investigations have been carried out to examine properties, performance and emission of different blends of JME. Result indicated that B20 have closer performance to diesel. The use of these methyl esters gives lower smoke, CO and HC but the Nitrogen Oxide emission is more. However to reduce the Nitrogen Oxide emission in diesel and various vegetable oil esters by lowering the combustion chamber temperature, Electronic fuel injection method is adopted. The study was carried out in a single cylinder 8 H.P running at 1800 rpm using the diesel, JME by the method of normal and Electronic Fuel Injection system and the result are compared between them. The result indicates that the Nitrogen Oxide emission is less for Electronic fuel injection method than the single injection. This helps to lower the combustion chamber temperature considerably, and hence the chance of generating the Nitrogen Oxide is minimized compared to the single injection.
A Mathematical Model for Wire Cut Electrical Discharge Machine Parameters Using Artificial Neural Network
Authors: Narayanan G. Sankara , D Vasudevan
Published: July 2014

Unconventional machining process finds heavy application in aerospace, automobile and in production industries where accuracy is most needed. This process is chosen over other traditional methods because of the advent of composite and high strength materials, multifaceted parts and also because of its elevated precision. Regularly in unconventional machines, trial and error method is used to fix the values of process parameters. An algorithm incorporating Artificial Neural Network (ANN) is proposed to create mathematical model functionally relating process parameters and operating parameters of a wire cut electric discharge machine (WEDM) and copper is the work piece. This is accomplished by training a learning algorithm of feed forward neural network with back propagation. The required data used for training and testing the ANN is obtained by conducting trial runs in wire cut electric discharge machine. Proposed algorithm paves reduction in time for fixing the values for the process parameters and thus reduces the production time along with reduction in cost of machining processes and thereby increases the production as well as the efficiency. The programs for training and testing the neural network are developed, using matlab 7.0.1 package.
Experimental Study on Diesel Engine and Analysis the Spray Characteristics of Diesel and Biodiesel by Varying Injection Pressure
Authors: Raghu Palani , Selvan M. Senthamil , Pitchandi K. , Nallusamy N.
Published: July 2014

— The spray characteristic of the injected fuel is mainly depends upon fuel injection pressure, temperature, ambient pressure, fuel viscosity and fuel density. An experimental study was conducted to examine the effect of injection pressure on the spray was injected into direct injection (DI) diesel engine in the atmospheric condition. In Diesel engine, the window of 20 mm diameter hole and the transparent quartz glass materials were used for visualizing spray characteristics of combustion chamber at right angle triangle position. The varying Injection pressure of 180 - 240 bar and the engine was hand cranked for conducting the experiments. Spray characteristics for Jatropha oil methyl ester (JOME) and diesel were studied experimentally. Spray tip penetration and spray cone angle were measured in a combustion chamber of Direct Injection diesel engine by employing high speed Digital camera using Mie Scattering Technique and ImageJ software. The study shows the JOME gives longer spray tip penetration and smaller spray cone angle than those of diesel fuels. The Spray breakup region (Reynolds number, Weber number), Injection velocity and Sauter Mean Diameter (SMD) were determined for diesel and JOME. SMD decreases for JOME than diesel and the Injection velocity, Reynolds Number, Weber Number Increases for JOME than diesel.
An Expatiate View of Solid Clay Based Desiccant Mould with Varying Void Fraction on Absorption
Authors: Parthiban Mohanram , Shanmugam V. , Senthil Kumar P.
Published: July 2014

Experimental study on moisture absorption of solid clay based desiccant mould with varying void fraction is presented in this work. Solid desiccant moulds of three types by varying void fraction with the composition of 10% cement, 10% of calcium chloride, 20% vermiculite with particle size of 5mm and above and 60% of bentonite were prepared and tested under uniform conditions in the drying chamber. The results show that the moisture absorption capacity of the mould is significantly affected when the void fraction is changed.
Analysis of Incylinder Pressure and Temperature Variation in a Four-Stroke S. I. Engine Using Wiebe’s Combustion Model
Authors: Vijayashree Vijayashree , Tamil Porai P. , Mahalakshmi N.V. , Ganesan V.
Published: July 2014

This paper presents the modeling of in-cylinder pressure variation of a four-stroke single cylinder spark ignition engine. It uses instantaneous properties of working fluid, viz., gasoline to calculate heat release rates, needed to quantify combustion development. Cylinder pressure variation with respect to either volume or crank angle gives valuable information about the combustion process. The analysis of the pressure – volume or pressure-theta data of a engine cycle is a classical tool for engine studies. This paper aims at demonstrating the modeling of pressure variation as a function of crank angle as well as volume with the help of MATLAB program developed for this purpose. Towards this end, Woschni heat release model is used for the combustion process. The important parameter, viz., peak pressure for different compression ratios are used in the analysis. Predicted results are compared with experimental values obtained for a typical compression ratio of 8.3.
Control of Grid Connected Inverter with PR Controller and LCL Filter for Interfacing Renewable Energy Sources
Authors: Deepthi K. , Vijayakumari A. , Joshy Arun
Published: July 2014

This paper presents a design procedure for Proportional-Resonant (PR) controller and a third order LCL filter which decide the performance of the converter that is used to interface the renewable energy source to the grid. The primary focus of the paper is to evaluate the performance of the controller with the filter for a microgrid application. A scaled down model of microgrid available in the department laboratory is considered for the performance evaluation of the designed controller. The system is simulated with a 2kVA PWM inverter and tested under conditions such as change in grid impedance, grid frequency and step change in reference current. The simulation results show that the PR controller with LCL filter tracks the reference with zero steady state error and the controller is found to be immune to grid frequency and micro-grid configuration changes.
An Efficient Approach for Voltage Stability Improvement Based on Artificial Bee Colony Algorithm
Authors: Immanuel D. Godwin , Kumar G.Selva , Rajan C. Christober Asir
Published: July 2014

Voltage stability assessment plays an important role in planning and operation of secured power system economically. In this paper an effective algorithm based on Artificial Bee Colony approach is developed to solve reactive power control problem for the improvement of voltage in all load buses. This algorithm employs optimal settings of control variables to achieve best solution for the objective functions. The proposed formulation is examined in standard IEEE 30 bus test system with the objective function of real power loss minimization as well as minimization of voltage stability index for the improvement of voltage stability. The test results are compared with the existing approach explained in the literature. From the test results it is absorbed that the voltage stability is improved satisfactorily.
Deformation Characteristic Analysis on Crimping of Large Diameter Welding Pipe
Authors: Fan Li Feng , Gao Ying , Yun Jian Bin , Yan Jia Xin
Published: July 2014

Crimping is widely used in production of large diameter submerged-arc welding pipes. In order to improve crimping forming quality, it is necessary to analysis deformation characteristic of crimping forming process. So, crimping is analyzed using finite element method.
Taking the crimping of X80 steel Φ1219mm×22mm×12000mm welding pipe for instance, the crimping forming process is simulated by finite element (FE) code ABAQUS. In this paper, the simulation data is validated by product and a comparison showed a good agreement with product results. The stress/strain from simulation is discussed. Thus, the results of research provides a basis to improve crimping quality.
A New Type of Brushless DC Motor Control Strategy
Authors: Zhang Xiao Lei , Wu Kui Hua , Wang Jian , Sun Wei , Wu Kui Zhong , Du Peng
Published: July 2014

Because torque ripple disturbance can be created when the brushless dc motor is communicating, In this paper, from two aspects of energy feedback and the torque ripple, H/L - PWM - ON control strategy is analyzed .And a simulation system is set up. Through the trials, it shows that H/L - PWM - ON strategy can efficiently complete the energy feedback, has small torque ripple, and fully proves the feasibility and practicability of this control strategy.
Adaptive Control of Chaotic Motion in Fractional Order Wind Generators
Authors: Lei Teng Fei , Meng Jing , Chen Heng , Ren Lin Zheng , Wang Xu
Published: July 2014

In this paper, the directly driven wind turbine with permanent magnet synchronous generator (D-PMSG) is investigated, the mathematical model of which is built up. Also, the chaotic behaviors or limit cycle phenomena is demonstrated under certain working conditions or the parameters of the model having a certain range of values. A novel adaptive controller is designed based on the quasi-Lyapunov stability theory for fractional-order systems. Also, electronic circuits are designed to realize the controllers using Multisim. The simulation results demonstrate the effectiveness and realizable ness of the proposed methods, besides, the research results will be provided as theoretical references for the study of improving control performance.
Design of the Stepper Motor Control System Based on FPGA
Authors: Han Xue Hui , Lei Li Hong , Yang Yong Bin
Published: July 2014

A stepper motor control system is designed based on the stepper motor controller and EP2C5Q208C8. The control system of the host human-computer interaction interface is designed by LabView; through RS232 to communicate with the PC. According to the characteristic of the stepper motor control system , Verilog HDL language program and the software of QuartusII are used to simulate each function modules. The analysis of simulation results and experiment show that using the method of FPGA+LabView can simplify the complexity of the system design and possess a very high stability on the running status. The motor running status can be easily observed in the PC interface.
Optimization Study of CVT Speed Ratio to Plug-In Hybrid Electric Vehicle
Authors: Zhou Min , Zhang Yan Fang
Published: July 2014

Taking CVT plug-in hybrid electric vehicle as the study subject, the objective function of the energy economy is created. In view of engine, motor efficiency and CVT efficiency coupled relationship; proposed reverse optimization algorithm to solve function. The target speed ratio of optimal energy economy is obtained in different SOC (State Of Charge), velocity, acceleration and slope. On the Matlab/Simulink platform, the system simulation model is built and simulated. The results shows that the target speed ration optimized control law in the case of no additional hardware cost , energy economy save about respectively 3.6% ,4.6%,6.7% in driving cycles of the NEDC,UDDS,HWFET before optimization.
Research of Direct Torque Control of Asynchronous Motor
Authors: Gu Chun Bo , Wang Zhong Chu , Liu Lin
Published: July 2014

Direct torque control (DTC) as a new type of motor control strategy, make the control system has good dynamic regulation performance. In this paper, we use the theory of direct torque control to research the speed regulation system of asynchronous motor direct torque control principle and its main component. Use Matlab/Simulink library to build the simulation model of induction motor DTC complete simulation and results show that the direct torque control run time has good control effect in asynchronous motor.
Research on Controller of Micro-Hydro Power System
Authors: Xie Nan , Qi De Zhi , Chen Wei Min , Wang Wei
Published: July 2014

On the existing independent operation of micro-hydro systems, a kind of circuit topology of micro hydro power based on self-excited asynchronous generator are studied. Using power electronic devices to meet power standard and reduce circuit losses. The double loop to control of inner current loop and outer voltage loop is studied, realizes the fast control of system and injected into the grid in the form of current, it’s safety and high efficiency. Last,using experimental platform to verify the feasibility of the system.
Research on Design Methods and Experiments of the Electro-Hydraulic Power Steering Pump
Authors: Chen Yong , Xia Jing Jing
Published: July 2014

In order to improve the performance of vehicle steering system and reduce the system energy consumption, the structure and operation principle of an electro-hydraulic power steering (EHPS) system with a electro-hydraulic steering pump are described, on this basis, with the function requirement of steering system, and by using vehicle design and fluid drive theory, the design method of this electro-hydraulic steering pump and its matching with the vehicle are presented. Through building electro-hydraulic steering pump test platform to test its performance parameters, the results prove the correctness and effectiveness of this kind of design method, provide the basis for subsequent development of the electronic control system.
Simulation of Permanent Magnet Linear Synchronous Motor’s Self-Organizing Rule and Self-Regulared Parameter Fuzzy Control
Authors: Zhang Li Juan , Luo Dan Yu , Cui Jun Liang , He Li
Published: July 2014

In view of the permanent magnet linear synchronous motor vector control system, this paper proposes a model reference adaptive speed controller gain fuzzy self-tuning neurons. The simulation results show that when a sudden load disturbance or parameter mutation, the gain of model reference adaptive fuzzy self-tuning neuron speed control has quick response, strong robustness, good dynamic and static characteristic, etc.
A Parametric Study of Microfluidic Power Generator Based on Reverse Electrowetting in a Microchannel Geometry
Authors: Han Wen Cheng , Wang Dian Sheng , Xiang Li Ping , Wang Yu Dou , Huang Zhao Qin , Li Ai Fen
Published: July 2014

The micro power generators that depend on converting the ambient energy into usable electrical energy for portable electronic devices have attracted much attention in recent years. A novel microfluidic power generator which is based on reverse electrowetting in a microchannel geometry was presented by Tom Krupenkin and J. Ashley Taylor. This generator overcomes the defects such as low output and low resource utilization of traditional energy converters. Understanding the parameters influencing output of this generator is a key to enhance the power output of it. This paper discussed the effects of factors on generator output by numerical simulation. The results show that promising performance of REWOD-based power generator can be achieved by choosing a thinner dielectric film with high dielectric constant and high break strength, and increasing the droplet oscillation frequency.
Analysis of Braking Energy Recovery in EV with EHB
Authors: Zhou Liang , Zhao Meng Yang , Wang Xin Yu , Li Xi Chao
Published: July 2014

The battery ability of recovering electricity plays a significant role in improving the regenerative braking performance. In this paper, a control for recovery of braking energy in Electric Vehicles (EVs) with electro hydraulic brake (EHB) is proposed, which makes the recovery transfer to the electric hydraulic pump of EHB directly, rather than being stored statically in the battery. An energy flow strategy was designed for the maximum braking energy recovery based on this control. The simulation results show higher energy recovery rate in comparison to the general recycling control.
Distributed Reactive Power-Voltage Control Method of Micro-Grid
Authors: Li Yu Wei
Published: July 2014

For micro-grid with multiple distributed power supply, a micro-grid distributed reactive power-voltage control method is proposed in this paper. By introducing active power disturbance, the load reactive power can be distributed in accordance with the distributed generation power rate, which leads to accurate distribution. At the same time, in order to ensure system voltage output stability in the rate, based on consistency and input/output linearization theory, under the distributed power multi-agent network topology, the distributed nonlinear co-droop controller is designed to make up for voltage fluctuation caused by active power disturbance. The simulation results verified the correctness and feasibility of the proposed control method.
Power Tracking Control Strategy Based on Feedback Frequency of Large-Scale Grid-Connected PV Generation
Authors: Wang Ling , Zhao Bei , Zhong Jian Liang , Malik Sarmad , Bao Hai
Published: July 2014

PV (Photovoltaic) generation output with MPPT (Maximum power point tracking) is unadjustable. In this paper, PV generation is expected to regulate grid frequency. Thus a power tracking control strategy based on feedback frequency instead of MPPT is put forward. The feedback frequency is transferred to controlling unit of DC-DC inverter. The DC bus voltage is adjusted by controlling the duty cycle of DC-DC invertor. A grid-connected PV system with a power tracking control strategy based on feedback frequency and a DC-AC inverter control module are built in MATLAB-Simulink platform. Experiment result indicates that PV generation could regulate grid frequency by the control strategy based on feedback frequency.
A Review of Fluorinated Proton Exchange Membrane
Authors: Chen Shi Zhong , Xing Shi Yu
Published: July 2014

The proton exchange membrane (PEM) plays a key role on performance of PEM fuel cell. This paper reviewed recent developments of perfluorinated and partially fluorinated PEMs for PEM fuel cells.Comparative analysis of various PEM parameters was presented. Perfluorinated sulfonic PEMs with better technology have the issues of complicated preparation process and high cost.Partially fluorinated PEMs have lower price,but performance is not good enough.
Research and Development of the Wind Power Monitoring System for North China Power Grid
Authors: Li Li Xing
Published: July 2014

Facing to the current environment, energy pressure and wind power development at home and abroad, combined with the actual situation of North China Power Grid, this paper analyzes the wind development in North China firstly, and then based on C# language and the Oracle database develops based on B/S mode of wind power monitoring informing system. This system includes monitoring module, wind data mining module, data management module, real-time alarm module, and the user management module, which realized the wind power in North China Grid remote monitoring and statistical analysis of the data, to ensure data consistency.
Research of Effect of Battery Participating in Demand Response
Authors: Zhang Rong , Qi Bing
Published: July 2014

Batteries have been widely used in the residential electric systems. This paper firstly analyzes the characteristics and feasibility of using the battery to participate in Demand Response (DR) programs. Secondly, the load characteristics in the two different kinds of battery systems are studied, including the power battery of electric bicycles and the battery which are used as the standby power for communication systems and computer systems. Thirdly, this paper studies the DR implementation method of reducing peak and filling valley and related impact on power grid load.
Research on Condition Monitoring of Protection System Based on Substation Area Protection
Authors: Wang Shi Yong , Shi Ting Ting
Published: July 2014

Protection equipment in intelligent substation includes Merging Unit, protection equipment and Intelligent Terminal. At present, the status of the intelligent electronic device in intelligent substation protection system is still lack of effective monitoring means. According to the characteristics that substation area protection can obtain current information of all circuits in substation through GOOSE network, a protection system conditioning monitoring relay named PSCMR is designed in this paper. Based on the principle of current differential, PSCMR can accurately identify the abnormal condition or malfunction of Merging Unit or Electronic Current Transformer and realize condition monitoring of intelligent electronic device in protection system.
Research on Multicast Flooding Suppression in Smart Substation
Authors: Wang Xiang Qun , Huang Zai Chao , Li Chun Long , Huang Zhi , Wang Xiao Bo
Published: July 2014

The existence of a large number of multicast flooding data in the process level of smart substation,causes serious influence on the real-time performance and reliability of network.Through the exchange principle of Ethernet,the forwarding process of second-layer multicast in network is introduced. Combined with the application in intelligent substation and some experimental data, through in-depth analysis of the 802.1Q VLAN isolating broadcast domain,setting static multicast to change the static MAC address table ,and GMRP to change the multicast information on Ethernet switch through the interactive protocol data, the multicast flooding suppression method is illustrated. And based on the practical engineering situation, the three kinds of methods are compared from the characteristics of debugging operation and maintenance convenience and reliability of intelligent equipment,then the technology route recommendation is given.
Study of Low Voltage Ride through in Photovoltaic Grid-Tied Inverter Based on Unsymmetrical Grid Voltage Fall
Authors: Liao Tian Fa , Chun Yang , Si Wen , Dong Chang Wen , Xue Jia Xiang
Published: July 2014

In this paper, 10KW three-phase three-level photovoltaic grid-tied inverter is applied as hardware platform. Considering the insufficiency of PV arrays power output and low overall efficiency due to grid voltage falls asymmetrically, P-R current controller is used to provide unsymmetrical positive and negative sequence current to the grid so that low voltage ride through (LVPT) in photovoltaic inverter can be achieved. Through the implement of experiments, it is well proved that the requirement of LVPT when the grid voltage falls asymmetrically can be met by applying the solution proposed in this paper.
Study on Control Strategy of the Grid-Side Converter on Doubly-Fed Induction Generator System
Authors: Yuan Feng , Tan Zhi Li
Published: July 2014

Double-fed induction generator has the characteristic that voltage signal output maintain stable with the stable rotate speed, which leads to the wide utility of double-fed induction generator in the area of distributed power generation. In this paper, the basic structure and control method of double-fed induction generator were introduced and emphasis was put on the control technique of grid-side convertor of double-fed interaction power generation system. Simplified model of grid-side convertor was given in the double-fed interaction power generation system. On this basis, the performance was analyzed and control scheme of grid-side convertor was designed. Through Matlab/Simulink, simulation of stable output of DC side voltage was realized.
Study on Improving Power System Damping by Using DPFC
Authors: Li Jin , Pi Ya Min , Yang Hui Yuan
Published: July 2014

In this paper, the series converters of Distributed Power Flow Controller are the main object of study. Its mechanism of suppressing power system oscillations is studied by theoretical analysis and formula derivation, which relies on a single-machine infinite-bus power system, installed the series converters. Then based on the mechanism, adopting the classic PI control and the damping controller, designed the transient stability control loop for the series converters. Finally, simulations performed by PSCAD/EMTDC, the results show that DPFC device can effectively suppress oscillation and improve system stability.
The Applications of New Energy at High Altitudes in Intelligent Greenhouses
Authors: Ji Chang Wei , Li Min
Published: July 2014

In the high altitude, solar energy, biomass energy and wind energy are widely available and renewable energy sources. It will improve the region's living levels at high altitude and the ecological environment when developed efficiently and in low cost. Making full use of renewable natural resources is of great value and significance to sustain the development of high-altitude areas of the economy. This paper is a kind of research and study, which based on new energy and aims at making full use of solar energy, wind energy, biomass energy complementary relationship and physical changes between planting and breeding to improve the renewable energy industry, integrated, modular for the high altitude area residents gathered .
The Research of Low Voltage Control at Li Tang Trunk Line in Li Jia Transformer Substation
Authors: Liu Bo , Liu Chen Yang , Cheng Peng Fei , Liu Chuan Bo , Wang En Lu , Zhu Bo , Xie Xin Nan , Guan Ling , Bi Chuan Bing , Wang Qing Hao , Lin Bin
Published: July 2014

In this paper, the rural power low-voltage of Li-Tang mains Trunk line raised the issue of secondary boost more than two groups reactive power compensation solutions, focusing on both the load power load variance method to calculate the location and placement of the regulator boost ratio, using precise moment method and reactive secondary terminal voltage rises method calculates the load side of intelligent reactive compensation on the trunk and installation location and capacity, to achieve the optimum design load tap rural power lines and intelligent var compensator configuration. The program changed in Fushun Li-Tang Trunk line in Li-Jia Transformer substation significantly after the implementation of effective, so that the end of the 31km-long line of power quality standards. Economic operation efficiency is improved.
A Low Power Way-Predicting D-Cache with Partial Tag Comparison Filter
Authors: Du Jin Xin , Cao Xiang Rong , Zhang Xiao Lin
Published: July 2014

This paper proposes a way-predicting algorithm which is specially equipped with a Partial Tag Comparison Filter (PTCF) to reduce the energy consumption in high associative D-caches. Conventional way-predicting algorithm achieves good performance and energy efficiency on I-cache which usually can guarantee the high prediction accuracy. However, the D-cache usually cannot reach such high prediction accuracy; therefore it suffers unavoidably from severe prediction inaccuracy penalties. The introduced PTCF aims at reducing energy penalties in case of prediction-miss and thus brings improvement in energy efficiency. The experiments show that the new D-cache reduces energy consumption by about 20%~60% without any latency degradation compared to conventional way-predicting D-cache.
A Model Based on BP Neural Network for Audible Noise Prediction
Authors: Peng You Xian , Tang Bo , Cao Hong Ying , Chen Bin , Li Yu
Published: July 2014

Audible noise prediction is a hot research area in power transmission engineering in recent years, especially come down to AC transmission lines. The conventional prediction models at present have got some problems such as big errors. In this paper, a prediction model is established based on BP network, in which the input variables are the four factors in the international common expression of power line audible noise and the noise value is the output. Take multiple measured power lines as an example, a train is made by the BP network and then the prediction model is set up in the hidden layer of the network. Using the trained model, the audible noise values are predicted. The final results show that the average absolute error in absolute terms of the values by the audible noise prediction model based on BP neural network is 1.6414 less than that predicted by the GE formula.
On the Mechanism of AC Electroosmosis
Authors: Dong Chao Chao , Wang Zhe Yao
Published: July 2014

Previously researchers considered ions in electric double layers (EDL) to analyze the phenomenon of alternating current electroosmosis (ACEO). However, they did not give a deep interpretation about the formation mechanism of ACEO and their theories cannot explain some experimentally observed phenomena. In this paper, we propose a physical model to analyze the formation mechanism of ACEO by considering ions both in EDL and in solution. It is found that the ions in solution play an important role in ACEO, and by considering the effect of ions both in EDL and in solution, we can reasonably explain some phenomena, including flow reversal at high frequency (typically 10-100 kHz) and inapplicability of ACEO at high salt concentration (above 30 μM), which existing theories cannot give convincing explanations. We also use Navier-Stokes equation to theoretically analyze the ACEO and it is found that the flow reversal can be predicted by our concepts in certain conditions.
A Review of Regional Reactive Power Optimization Techniques
Authors: Wei Wei , Ding Li Jie , Liu Yan Jiao
Published: July 2014

With increasingly complex of the power grid structure and increasingly user requirements of power quality, Power grid voltage reactive power optimization is still the difficult points in power system operation control. This paper introduces the general optimization methods of multi-objective reactive power optimization, intelligent algorithm, the development of the hybrid method, and their respective advantages, disadvantages and improvement; It also analyzes and summarizes the simplification of search space for reactive power optimization and the key issues and research development trend of the real-time reactive voltage control system.
Clustering Algorithm of Wireless Sensor Network Based on Energy Optimized
Authors: Yi Yun Hui , Wang Run Liu
Published: July 2014

Clustering algorithm can effectively solve the imbalance of energy consumption of different nodes. Based on the analysis of traditional LEACH protocol, we propose an improved sensor network clustering routing protocol, which reduced the cost of control information in formation process of clusters by adopting a new kind of competition parameters of cluster head, so as to solve the problem of energy heterogeneous of network node. The simulation results show that the protocol can effectively save the energy consumption of the nodes, and prolong the network life time.
Parameter Identification of Load Models Using the CQDPSO Algorithm
Authors: Wang Zhen Shu , Bian Shao Run , Zhang Da Hai , Wang Xiao Di , Liu Xiao Yu , Yu Kai
Published: July 2014

Load modeling has become a critical problem that is urgent to be solved in power system modeling. In this paper, CQDPSO algorithm, a hybrid optimization algorithm that combines quantum delta-potential-well-based particle swarm optimization (QDPSO) algorithm and chaotic optimization algorithm (COA), is proposed to identify parameters of the selected load model. Numerical results illustrate that the proposed method can improve the accuracy and reduce the computation complexity for load model parameter identifications.
The Selection of Online Power Flow Calculation’s Known Quantities
Authors: Wang Ling , Bao Hai , Chen Yu Long
Published: July 2014

The difference between schedule power flow and online power flow is that the former has no corresponding physical power flow, while the latter is the reappearance of existing physical power flow. Owing to the different premise, the selection of power flow calculation’s known quantities can be different. A schedule power flow schedules physical power flow for power system, so the selection of known quantities has strict requirements, such as active power and reactive power regulation capability. Since the physical power flow exists, the selection of online power flow calculation’s known quantities can be more flexible. For example, we can choose load bus as slack bus or replace PQ bus with PV bus. The example demonstrated that we could locate the stealing electricity buses by choosing load bus as slack bus. Considering that voltage amplitude measurement accuracy is higher than reactive power measurement accuracy, we can replace PQ bus with PV bus and make the power flow calculation results more consistent with the physical power flow. Finally, the examples show that online power flow calculation’s known quantities can be selected flexibly according to the actual situation rather than strictly following the classical power flow calculation requirements.
Prediction Model for Dissolved Gas in Transformer Oil Based on Non-Parametric Regression
Authors: Chen Jin Qiang
Published: July 2014

The non-parametric regression prediction model for dissolved gases in power transformer and its application are studied. As the intervals between two analytic experiments of transformer dissolved gas are unfixed,the data sequence sampled with unequal intervals is converted into the data sequences with equal intervals,which is smoothed to form a new sequence. And then use the historical samples data to establish non-parametric regression model for prediction. Compared with the grey model,the non-parametric regression model has better prediction accuracy. The case verifies the correctness and feasibility of the method.
Research on Viscosity of Watered Fuel Oil Prepared by Mechanical Agitation
Authors: Zhang Lu , Zhu Yi Min , Li Tie , Zhang Hong Peng
Published: July 2014

Viscosity of Watered fuel oil, which was prepared by a self-made mechanical micro-mixing device, was measured with rotation viscosimeter. The effects of oil temperature, agitation speed and water content on viscosity were investigated in this research. The experimental results showed that: viscosity of watered fuel oil decreases with the increasing of oil temperature between 60-80 °C and water contents in 2.0-8.0 %, but increases with the accelerating agitation speed at 1000-1300 r/min.
Bundle Conductors Corona Current Harmonic Wave Measurement
Authors: You Shao Hua , Chen Li , Huang Jie , Liu Yun Peng , Lü Fang Cheng
Published: July 2014

In order to research high level harmonic wave of six bundle conductors corona current, a measurement system was developed, and a series of wave data was obtained. Corona current is one of important corona characteristic research contents. The corona current measurement system can be used to measure the wide frequency band corona current. Six-bundle conductors was tested, and corona current was obtained. And the current signal collected in this way is safe and reliable. To research the six-bundle conductors’ corona current characteristic, conductor corona current harmonic wave was analyzed, by advanced Hanning windowed interpolation FFT algorithm was adopted. Corona current harmonic characteristics before and after corona onset were compared. Research results show that, after corona onset, corona current odd harmonic increases in evidence, and even-order harmonic increase less relatively. Triple-frequency harmonics and quintuple harmonics increase obviously very much.
Design of a Real-Time Detector for Solution Conductivity Based on Conductivity Electrode
Authors: Li Jia Nian , Ma Yan , Feng Rui , Ni Hui Na
Published: July 2014

In order to realize real-time detecting for solution conductivity, an on-line detector powered with 9V battery was developed. The detector consists of conductivity electrode, excitation signal generating circuit, RMS detecting circuit, MSP430F2132 microcontroller, DS18B20 temperature sensor, HT1621 displayer and SPI interface. The solution conductivity was measured according to the principle that the electrode’s output resistance varying with conductive ions concentration of the solution, the measured results could be displayed on HT1621 and be sent to other controllers through SPI interface. An optimum excitation signal that a square wave signal (the amplitude was ±3.5V, and the frequency was 1.8 kHz) had been determined by experiments, to minimize polarization effect of the conductivity electrode. Verification test had been performed for the detector, the tested results showed that maximum relative error of the detector was 2.94%, could meet the requirement of practical application.
Design of Online Monitoring and Evaluation System for Master Station Running Status
Authors: Yu Fang , Zhuang Wei Jin , Liu Jin , Xu Pan , Huang Hai Feng
Published: July 2014

The increase of data access capacity and data types of the power grid leads to a more complex and varied grid running environment. Hence, in order to guarantee the running security of the master station, an online monitoring and evaluation system based on index system for master station is proposed in this paper. It can construct a dynamic evaluation model and complete automated collection, analysis, scoring and evaluation of indexes by using specific index calculation methods. Moreover, this system can provide comprehensive interface display for evaluation results and achieve online alarming for the abnormal situations of the master station. This system offers a new and effective way to guarantee the safe and reliable running of the master station.
Fault Diagnosis of Bearing Based on KPCA and KNN Method
Authors: Wang Qiang , Liu Yong Bao , He Xing , Liu Shu Yong , Liu Jian Hua
Published: July 2014

Selection of secondary variables is an effective way to reduce redundant information and to improve efficiency in nonlinear system modeling. The combination of Kernel Principal Component Analysis (KPCA) and K-Nearest Neighbor (KNN) is applied to fault diagnosis of bearing. In this approach, the integral operator kernel functions is used to realize the nonlinear map from the raw feature space of vibration signals to high dimensional feature space, and structure and statistics in the feature space to extract the feature vector from the fault signal with the principal component analytic method. Assessment method using the feature vector of the Kernel Principal Component Analysis, and then enter the sensitive features to K-Nearest Neighbor classification. The experimental results indicated that this method has good accuracy.
Fault Location Based on Bayesian Classifier
Authors: Qin Li Jun , Cao Jing Jin
Published: July 2014

When a node of power system have a failure, we can deal with it by the multi-time electrical comprehensive phasor data of each node before and after the failure, introduces Bayesian Classifier to handle with the node failure case so as to distinguish and locate fault. Experiments show that Bayesian classifier is an effective method in fault location.
Improvement and Application of Fan Fault Diagnosis of Power Plant Based on Fuzzy Rules
Authors: Liu Chang Liang , Yao Xin Tong
Published: July 2014

In view of the nonlinear, fuzzy relationship between fan fault reason and fault symptom, put forward a kind of threshold diagnosis strategy combined with fuzzy rules and case reasoning. Using a fan fault vector through fuzzy fault diagnosis model to compare with a given threshold, then generate the initial fault solution set, and finally using case-based reasoning thinking, accurate fault location. Then we verify the method’s effectiveness through a fault analysis of fan rotor vibration. The results show that the combination with fuzzy rules and case reasoning can effectively solve the problem of multi factors of failure reasons.
On-Orbit Fault Location Analysis and Solution Strategy of GEO Satellite Solar Array
Authors: Zhang Jiao Yan , Han Gang Weng , Zhu Wei Bo , Liu Jing Yong , Kang Na
Published: July 2014

Solar array is the important part of the satellite’s Electrical Power Supply, the failure of the solar array may lead to the loss of some or all of the satellite’s functions, so fault location in time and solution strategy of solar array is particularly important. The thesis studied the on-orbit failure of GEO satellite’s solar array, analyzed the fault location according to the related telemetry, and researched the solution of all kind of the faults. The thesis contributes to the satellite control center to locate faults in time and the satellite manufacture to improve the design of the solar array, it is helpful to improve the reliability and safety of the satellite’s on-orbit running.
Research on Testing Parameter Detection Equipment of the Aeroengine Based on PC104
Authors: Jiang Xiao Lian , Wei Xiu Ling , Lv Xue Yan
Published: July 2014

Technical parameters that affect the performance of the engine include: rotor speed of the engine under high and low pressure, oil pressure, fuel pressure and exhaust temperature, etc.This article describes the features, function, structure and working principles of the testing parameter detection equipment based on the aeroengine of PC104,and we design detection circuit for the main test items.