bluuebunny/crossref_metadata_2025 huggingface dataset:
Research on Short-Term Load Prediction Including the Photovoltaic System
Authors: Lei Yang , Zhou Shi Ping , Xia Yong Jun , Hu Gang , Shu Xin
Published: December 2013

The global energy issues have become increasingly prominent in recent years, photovoltaic power generation as a renewable energy use pattern is widely used, but a large number of photovoltaic power generation to the grid is a big negative impact, it is necessary to predict the output power of the photovoltaic. Power system load forecasting is the reference and safeguard of the power system operation. This article analyzes the main point of the prediction of photovoltaic power system and power load system, then introduces the support vector machine (SVM) based on quantum particle swarm optimization (QPSO) to do the prediction. And then this paper proposes a generalized system load prediction system containing the photovoltaic power system.
Conjugate Heat Transfer in Two Partial Enclosures Connected by Refrigerator/Heater
Authors: Liu Di , Zhao Fu Yun
Published: December 2013

Natural convection conjugated by two partial enclosures, connected by refrigerator/heater, has been numerically studied. Thick walls facing the opening are heated in one zone and cooled in the other zone respectively by constant heat fluxes. The isothermals, streamlines and heatlines are presented for varied governing parameters, Rayleigh numbers, Ra from 103 to 107, solid thick walls to fluid thermal conductivity ratio λS from 0.01 to 10.0, cavity aspect ratio, Ar from 1.0 to 8.0, and refrigeration coefficient, COR from 0.1 to 10.0. The streamlines and heatlines visualize the real fluid flow and heat transfer process or structures. Anti-clock streamlines are generated in both zones. Variations of extreme temperatures, Tmax or Tmin and dimensionless volumetric flow rate on the opening, M, along with these governing parameters are also presented in tables or figures. Correlations of extreme temperatures with Ra, λS and COR are given for varied Ar. At last, the unified correlations of with those parameters also are presented and analyzed. The results show that the common trends and characteristics of heat and fluid flow independent of Ar for both zones are summarized, though the convection is amplified with increased Ar.
A Numerical Study on Integral Solar Air Collector
Authors: Dong Fu Sheng , Hu Ming Fu , Huang Xiao Chun
Published: December 2013

A mathematical modeling method was devoted to study the thermal performance of integral solar air collector. A mathematical model of heat transfer was set up based on one-dimension assumptions at first, and then numerical solution was brought out by using finite-difference method under one-dimension steady heat exchange. Through the MATLAB programming, the approximate solutions for the local air temperature and thermal efficiency were obtained at the quasi-steady state. After calculation, the influence of air inlet velocity, inlet temperature, solar radiation intensity and height of flow channel on the performance of collector was analyzed. It is discovered that the mathematical model is reasonable, the thermal efficiency decreases with temperature of inlet air increasing and increases with air velocity increasing, on which the solar radiation intensity have little influence. Depth of the channel and optimum flow both have a best value.
The Influence of Dynamic Load on Ground Source Heat Pump System Performance
Authors: Wang Jing Jing , Zeng Yun Fan , Tian Hui Fang , Wu Zhou
Published: December 2013

This paper analyzed the way that dynamic load influenced heat transfer performance of ground heat exchanger in summer conditions, taking a ground source heat pump central air conditioning project in toll stations in Shanxi Province as research subjects. Data analysis indicates that dynamic load effect on the changes of supply and return water temperature of both buried side and load side.
The Experimental and Numerical Study of the Stability of Ultra-High Pressure Water Jet
Authors: Gong Chen , Yang Min Guan
Published: December 2013

In order to realize the stability-control of ultra-high pressure water jet, its kinetic characteristic should be unfolded firstly. This study measured the fluidic beam concentration (FBC) of jets discharged from six nozzles of different configurations. We also discuss flow physicals governing FBC with the help from a preliminary numerical simulation. Jet interface, the boundary line between jet and still air is like a long stepped line in the upstream, and turned to linear variation in the midstream and downstream. The characteristic of the jet can be controlled by the configuration of the nozzle exit effectively. Compared simulation results with experimental data, the conclusion can be drawn that the configurations of the nozzles have a significant influence on the vortexes which can decide the FBC.
Application of Fruit Fly Optimization Algorithm-Least Square Support Vector Machine in Fault Diagnosis of Fans
Authors: Hong Wen Peng , Liao Ming Jun
Published: December 2013

The parameter selection problem of kernel function in support vector machine directly affects the generalization ability of support vector machine model .In order to improve the accuracy of the fault classification of centrifugal fan ,the classification method based the Drosophila algorithm optimizes least square support vector machine is proposed In this paper .First, it uses the eigenvectors based on the fan vibration frequency domain as learning samples .Then it uses the improved least square support vector machine model to recognise the patten of the energy feature of fan vibration signal .This article also uses the particle swarm and ant colony algorithm to optimize least square support vector machine .The simulation results show that the method of least square support vector machine based on Drosophila optimization has the advantages of high recognition rate and high diagnostic speed .And the method is feasible and effective.
Study on Internal Flow Field of Series Pulsed Nozzle
Authors: Tang Chuan Lin , He Xiao Ting , Hu Dong , Wang Xiao Ming
Published: December 2013

This paper describes experimental study and numerical simulation of series pulsed nozzle. The simulation of internal flow field in nozzle with different cavity length was carried out by using CFD. The influence of chamber length on the velocity distribution and the axial velocity was analyzed. The simulation results indicate that there is a optimum rang of cavity length producing the maximum outlet velocity. The dynamic pressure of pulsed jet was also studied by using SD150 test system. The effect law of chamber length on the impact pressure of pulsed jet was analyzed. The experimental results show that the peak of hitting power reaches the maximum within a certain range of cavity length. Simulation results are in agreement with Experimental results.
Numerical Investigation of Sediment-Laden Flow in a High-Head Francis Turbine Runner
Authors: Zhang Hong Ming , Zhang Li Xiang
Published: December 2013

The 3-D turbulent particulate-liquid two-phase flow equations are employed in this study. The computing domain is discretized with a full three-dimensional mesh system of unstructured tetrahedral shapes. The finite volume method is used to solve the governing equations and the pressure-velocity coupling is handled via a Pressure Implicit with Splitting of Operators (PISO) procedure. Simulation results have shown that the sand erosion rate on pressure side is more than on the suction side of the blade. The maximum value of sand volume fraction and the maximum value of sand erosion rate are at same location.
Experimental Study of the Vertical Hydraulic Drag Force on Regular Tetrahedron
Authors: Le Rui , Jiang Wei , Liu Qi , Sun Nan Chang , Xu Bing
Published: December 2013

It is well known that the hydraulic drag force on objects cant be ignored in computing the movement of objects in water. And the drag forces on sphere and cuboids have long been studied. While in hydraulic engineering, objects with regular tetrahedron shape are widely used to form the foundation and temporary dam for they can interlock each other to obtain a compacted integral. In this article the vertical hydraulic drag force on regular tetrahedron is studied by indoor experiments, the relation of the vertical hydraulic drag coefficient and the vertical velocity is proposed. And the max vertical speeds of different materials are deduced. The result is helpful to compute the movement of regular tetrahedron in water and estimate the impact effect on the groundwork.
A Meshless Method for Advection-Diffusion Problems
Authors: Xue Dang Qin , Zhao Huan Ping , Zhang Jia Xi , Hou Shu Lin
Published: December 2013

This paper formulates a radial basis function meshless method for the numerical simulation of the advection-diffusion problems. The spatial derivatives are approximated by RBF collocation technique whereas the temporal derivatives are discretized using the Crank-Nicholson method. Corresponding boundary conditions are enforced analytically at a discrete set of boundary nodes. The performances of the present method are demonstrated through their application to an advection-diffusion problem.
A Central Air Conditioning System Design for Hotel in Guangzhou
Authors: Wu Zhou , Yang Fang , Tian Hui Fang , Wang Jing Jing
Published: December 2013

The primary mission of this design is the air conditioning design of a hotel in Guangzhou city. The calculation of cooling load & heat load, division of the air conditioning system and the determination of the scheme, the design of the duct and water system, and the design of the smoke prevention and extraction system are all included. According to the related standard and considering the energy saving and comfort requirements, the air conditioning system are determined through the economic and technological comparison. Primary return air system is used for open office area and dining hall; fan-coil units with fresh air system is adopted for the guest rooms of the hotel; and the VRV system is adopted for the large conference room. The new air in restaurant rooms and the large conference room is handled by full-heat type fresh air exchanger; new air in guest room is handled by air conditioning units.
The Challenges and Strategies of Diffusion for Solar Energy Application on Taiwan Buildings
Authors: Liu Shih Yuan , Perng Yeng Horng , Ho Yu Feng
Published: December 2013

Taiwan is highly vulnerable in energy security, but geographic conditions for the development of solar energy applications have created a considerable advantage. However, the total installed solar energy capacity is far less than might be expected. Consequently, this study proceeds to explore the main factors that affect diffusion of solar energy application concerning Taiwan buildings. Through the evaluation decision-making system model and expert groups giving evaluation values and feedback, the study found twenty-three items of key influencing factors with seven major objectives, and propose strategies for energy development in the future to improve the quality and quantity of renewable energy applications and competitiveness of national energy. This research, in addition to providing references to relevant environmental energy systems for deployment and technological R&D, also provides developing and underdeveloped countries access to applications of solar energy technology assessment and forecasts for the future.
Experimental Study on the Characteristics of Jet and Drop Formation Related to a Fluidization Method for Ice Slurry Production
Authors: Liang Kun Feng , Gao Chun Yan , Ruan Chun Lei , Wang Lin
Published: December 2013

The new fluidization method of liquid-liquid circulating fluidized bed proposed for ice slurry production was investigated experimentally. Multiple small water-drops were formed in another immiscible liquid coolant by a single-nozzle atomizer and frozen in the fluidized bed by direct contact heat transfer. Experiments were conducted to research the dynamic behaviors of jet and drops formation in the ice making system by the high resolution digital camera and image processing. The photos of jet development, breakup and drop formation were obtained. The affects of the shape of jet breakup, jet length and its surface fluctuation on drops size were revealed. The range of drop sizes and the sloping extent have always increased with the jet rate increasing. And varying jet shape directly results in the jet breakup into droplets under different time and test conditions, so the variation laws of the jet shape contribute most to the quality of the liquid drop, such as drop size distribution.
Research on Control Strategy of the Stand-Alone PV/Battery System
Authors: Wang Shu Zhao , Wu Hong Bin
Published: December 2013

With the battery charging or discharging, it can effectively stabilize power fluctuation of the photovoltaic generation (PV) or the load in a stand-alone power generation system. In this paper, based on the mathematical models of the PV and the battery, it connected the PV and the battery on the same DC bus and proposed energy management system with hysteresis control on the DC bus. In order to prevent the battery from switching back and forth among working state and stopping state, the outer voltage loop took the nonlinear function control strategy of the battery. With the inverter adopting voltage frequency (V/f) control strategy, it maintained the voltage and frequency on AC bus. With the PSCAD/EMTDC, it analyzed the ability of the battery stabilizing the power fluctuation of the PV or the load. And it proved the correctness and feasibility of the established models and control strategies. So those provided theoretical reference for the photovoltaic system that was employed efficiency in the remote areas.
Motion Characteristics and Influence Factors of Piston Assembly in a Compression-Ignition Hydraulic Free-Piston Engine
Authors: Yu Ying Xiao , Yuan Zhao Cheng , Ma Jia Yi , Li Shi Yu
Published: December 2013

The advantages and basic structure of hydraulic free-piston engine (HFPE) were presented. And the operation principle of a single piston compression-ignition HFPE was analyzed. Based on the basic theory of thermodynamics, hydraulic fluid mechanics and dynamics, the system simulation model for a single-piston compression-ignition HFPE was established in the environment of MATLAB/SIMULINK. The simulation results, which accord with the related literature data, indicate that the asymmetric characteristics of piston motion in the entire cycle are very obvious, the compression stroke duration is longer than the expansion stroke, the time at around the top dead center (TDC) is short. The piston assembly motion is a process when the energy balance is fulfilled, and some factors must be taken into account for design optimization, such as the piston assembly mass, compression accumulator pressure, fuel injection timing and fuel injection quantity.
Synthesis, Physicochemical, and Tribological Characterization of Nano Lubricant Contained Cu Nanocolloid as Additive
Authors: Zhang Xi Feng , Dong Hong Xia , Xu Zhen Ye , Li Ke Wei , Qin Min
Published: December 2013

Monocrystalline Cu nanocolloid with 4.3 nm average particle size and 2.3～9.5 nm particle size distribution was successfully synthesized in situ by liquor-phase reduction synthesis, using copper acetate tetrahydrate as precursor, ascorbic acid as reductant, polyethylene sorbitan monooleate （Tween-80） as modifier, and liquid paraffin as solvent. The as-prepared copper nanocolloid was characterized by XRD, SAED, and TEM. Nano-lubricating oil with excellent dispersibility, chemical stability, and compatibility with other additives verified by TG-DSC, was achieved via adding as-prepared nano-copper into Mobil 1 5w-30 lubricating oil. The nano-lube’s physiochemical properties were characterized according to Chinese national standard. The tribological behavior of nano-lubricant was investigated on ball-on-disk UMT-Ⅱ tribometer and four-ball tribometer. The worn surface morphology was analyzed by means of SEM and EDS. Experimental results show as follows. The Mobil 1 5w-30 lube’s tribological property is markedly enhanced with the as-prepared copper nanocolloid as its additive. The as-prepared nano-Cu agglomerate discontinuous deposited, extrude, melt, spread, and form a film in micro-defects on the worn surfaces, then improve the friction-reducing, anti-wear ability, extreme pressure value, and extreme working ability of Mobil 1 5w-30 lubricant.
Fault Response of Inverter-Based Distributed Generators in Distribution Network
Authors: Li Bin , Zhang Hui Ying , Lin Meng , Yang Xia , Kirby Brian
Published: December 2013

Inverter-based distributed generators (IBDG) have been integrated into distribution network increasingly. The characteristics of IBDG depend on its control strategy. This paper builds up the control scheme of IBDG considering specific control strategy. Theoretical analysis has been made on the fault response of IBDG and the inverters control system based on different degrees of voltage sag. A simulation model of power network with IBDG has been built in MATLAB for research. The simulation result has proved the correctness of the conclusions of the analysis.
Optimized Control of DC Voltage Based on BP Neural Network in Active Power Filter
Authors: Peng Jian Fu , Cheng Le Feng , Huang Li Peng , Jiang Jing , Yu Tao
Published: December 2013

This paper presents an intelligent method of optimized control of DC voltage based on BP Neural network, on account of this presentd method, by collecting parameters of grid voltage and significant frequency of harmonic current, then, construct couples of tranining samples and fully use the advantages of BP Neural network that can discretionarily utlize arbitrary precision to approximate any continuous function, and computing the optimized voltage of DC side, as a result, achieving online adjustment of capcitors voltage at DC side. Futher more, adjusting the hysteresis width automatically according to the voltage variation of capacitor, thus the voltage of DC side can automatically adapt to fluctuation of grid voltage and load current, so that to obtain comprehensive optimum of power loss and compensation performance of power active filter.
Power Quality Disturbances Classification Based on Modified S Transform and Decision Tree
Authors: Yi Ji Liang , Qin Ou Yang
Published: December 2013

A novel method for power quality disturbances classification is presented using modified S transform (MST) and decision tree. The time-frequency properties of power quality disturbances are analyzed and the effects of window-wide parameter g on the properties are discussed. Four statistical features are extracted from the MST module time-frequency matrix and a decision tree is utilized to recognize 9 power quality disturbances. The simulations are made to illustrate the validity of the method proposed for power quality disturbances recognition.
Improved Algorithm for Complex Distribution System Reliability and its Programming
Authors: Li Ming Jun , Ou Yu Qiang , Cai De Hua , Mo Hui Jiang
Published: December 2013

In this paper, a new kind of recursive algorithm has been raised. It optimized the distribution network system reliability calculations, improved some efficiency, and met the user's needs closely. This algorithm needs no network equivalence process,has no complex principle and brings no difficulty to programming.Through its failure analysis, can be more easily identify key equipment of distribution systems for customers to adjust. This algorithm can easily cooperate with fault reconfiguration.No adjacency matrix and special chain table will be formed during searching procedure; it takes advantage of basic table of node data and branch data to do searching work, and easily to get access with field data. The algorithm uses recursive search also reduces programming greatly.
The Grid Harmonic Amplification and Transmission Characteristics Research
Authors: Jiang You Hua , Kong Xiang Qi , Pan Ai Qiang
Published: December 2013

Harmonic transmission is influenced by many factors in the grid and the harmonic resonance phenomenon may be occurred. This paper analyzes the influencing factors, and the relevant model was established, and applied to the practical case.
The Impedance Calculation Methods Using Damped Sinusoidal Signal
Authors: Gao Yuan Sheng , Chen Qiang , Sun Qiang , Chen Zhong , Zhang Wen Hai
Published: December 2013

There are large number of transient signals will be produced when the operation mode is changed. And the frequency of the transient signals distributed in wide range. The most of them are damped and oscillated. The impedance is a popular feature in power system, and it has been widely used in relay protection and fault location. So the impedance calculation based on the damped sinusoidal signal have been the important way to diagnosis the fault, locate the fault and so on. But the methods used now are based on the fundamental impedance calculation theory, lacking theoretical basis. In fact, the traditional methods for fundamental signal calculation are not appropriate for the quantitative analysis of damped sinusoidal signal. The paper analyzed the impedance calculation based on damped sinusoidal signal, combined the features of damped sinusoidal signals and the traditional impedance calculation method. The two typical signal analysis methods for damped sinusoidal signal extraction are used to calculate the accurate impedance based on the different extraction results. And the analysis laid a foundation for the impedance calculation using damped sinusoidal signals.
An Optimized MPP Tracking Algorithm under Partially Shaded Conditions in Photovoltaic System
Authors: Zhong Qing , Yu Nan Hua , Wang Kun , Feng Lin , Li Guo Jie , Chen Kan
Published: December 2013

In photovoltaic (PV) power generation systems, the P-V curve of PV array contains several peaks under partially shaded condition (PSC) so that conventional MPP tracking (MPPT) methods can hardly find the real MPP (MPP). This paper proposes an optimized MPPT strategy, which is not only fit for PSC but also suitable for uniform shaded conditions (USC). Comparing the optimized MPPT strategies and conventional MPPT methods, this paper illustrates the improved performance of optimized strategy under PSC. The simulation and experiment results show that the optimized strategy can track the global MPP precisely to improve the efficiency of PV systems.
An Optimal Automatic Generation Control Strategy for Interconnected Power Grid with Wind Power
Authors: Weng Yi Xuan , Deng Chang Hong , Chen Lei
Published: December 2013

As the continuous increase of wind power installed capacity in modern grid, its inherent randomness and fluctuation may cause a series of problems to power system frequency control. Since the dynamic characteristics of traditional automatic generation control (AGC) based on PI control cannot fully and effectively meet the interconnected power grids requirements for load frequency control. In this paper, a strategy based optimal control theory is proposed, and a new dynamic cost function is also presented. Compared to the conventional PI control method, the proposed strategy has better dynamic adaptability to interconnected power system with wind generation, and the optimal coordination among control areas can be realized more easily. Take the two-area interconnected power system with wind power model as an example, the simulation is carried out based on MATLAB/SIMULINK. The simulation results show that the control strategy can obviously suppress the fluctuation of system frequency and tie-line power, and its effectiveness is confirmed.
An Communication and Battery Performance Evaluation of the Demand Response and Battery Storage Coordination System Potential for Providing Microgrid Tie-Line Smoothing Services
Authors: Sun Jian Wei , Tang Sheng Wei , Wang Dan , Wang Ran , Qi Ye Bai , Jiang Tao
Published: December 2013

In this paper, an communication and battery performance evaluation is discussed for a demand response and battery storage coordination algorithm, which provides a new way of microgrid tie-line smoothing service. A battery storage system and a total number of 1000 heat pumps are modeled to demonstrate the algorithm. A temperature priority list (TPL) model is used to describe the behavior of the heat pumps. Besides, a control strategy via a two-way communication networks is implemented to smooth the tie-line fluctuations. Then considering in a no ideal communication environment, the impacts of the unexpected changes of the on/off status of the heat pumps on the simulation results are studied. Meanwhile, the impacts of different numbers of batteries and batteries with different charging rates are also referred. The results show that coordinating the heat pumps and batteries can significantly smooth the fluctuations brought by the integration of the renewable resources such as the wind and solar power. The switching status changes of the heat pumps, the numbers and charging rate of the batteries also have great influence on the proposed smoothing performance.
Based on Delay Compensation System for Shunt Active Power Filter Research
Authors: Yao Xin , Yao Zai Lin , Teng Xin Ying
Published: December 2013

APF harmonic detection is the study of the most important parts of the core , quickly and accurately detect the harmonic current is able to quickly output harmonic compensation circuit current of the premise. Delay compensation system is based on the increase in the method specified time compensation angle , which can accurately detect the harmonic current at the same time , the low-pass filter to minimize the time delay generated by MATLAB simulation, the use of delay compensation system active Filter harmonic Detection and Compensation excellent performance, while ensuring high precision detection and compensation while ensuring at the same time , and fully complete filter real-time functionality .
Imprecise Adequacy Assessment of Generating System Incorporating Wind Power Based on Interval Probability
Authors: Qi Xian Jun , Shi Jia Yi , Peng Xiang Tian
Published: December 2013

Probability box (P-box) and interval probability (IP) were used to express both variability and imprecision of wind speed and output power of WTGs. The p-box of WTG's output power was constructed by empirical cumulative distribution function and K.S. confidence limits. The discrete IP distribution of WTG's output power was elicited from the p-box. The optimization model of imprecise generating capacity adequacy assessment incorporating wind power was established and solved by genetic algorithm (GA). Case study on RBTSW system shows the rationality of presented method.
Fault Tree Establishment of Lightning Protection System Safety of Solar Photovoltaic Building
Authors: Guo Fu Yan , Wang Yue , Huang Min De
Published: December 2013

This paper mainly uses the fault tree method to analyze the security of lightning protection system of the BIPV, to identify the main factors of influencing the lightning accidents caused by the loss of life, and provide a reliable basis for determining the safety performance of the lightning protection system, to achieve the purpose of preventing lightning accident prediction.
Analysis of a New Life Cycle Assessment Model Based on the Solar Building Integrated Technology
Authors: Zhao Shan Guo , Zhang Xiao Song , Fang Yuan , Li Xian Liang
Published: December 2013

Solar Building Integrated Technology is an important measure in architecture energy conservation and environment protection. Taking into account of factors of environment, the new LCA model of Solar Building Integrated Technology is set up and then a concept of Environment Impact Payback Time is put forward. At last, an example of a certain solar thermal system is conducted, the final impact value of which is-2382.39Pt, and the Environment Impact Payback Time is 10 years.
The Study of Insulator Influence to the Electromagnetic Wave Propagation in GIS
Authors: Jiang Guo Qing , Xu Dong Sheng , Li Zhao , Li Lu , Wang Yi , Zhang Qing Jun , Lu Yong , Jiao Hai Long , Li Jun Hao
Published: December 2013

GIS is the key equipment in power grid and partial discharge is the main cause leading to insulation breakdown. UHF detection is an effective method for PD detection in GIS. The insulator has great influence to the electromagnetic wave propagation in GIS. The FDTD simulation model of GIS is setup to study the influence of insulator to electromagnetic wave propagation. The amplitude and energy distribution at GIS model with and without insulator are study in this paper.
Parameter Identification for Power Transformer Using Zooming Genetic Algorithms
Authors: Zhu Hou Quan , Fang Rui Ming , Peng Chang Qing
Published: December 2013

Transfer functions of power transformer can be used for detection and localization of partial discharges. There is no access to sectional windings when transformer insulation has been impregnated into oil, so the parameter identification of transformer windings is difficult without the knowledge of sectional winding voltages. In this paper, genetic algorithms (GAs) based approach are proposed to identify the parameters of transformer windings. An impulse signal was injected into the bushings of transformer, then the responses at neutral terminals were measured, and thee acquired data were used to identify the parameters using GAs. To accelerate GAs’ convergence, a zooming operator was introduced in genetic programming process. The experimental results show that the proposed ZGA approach is effective.
Application of FTA and Improved FAHP in Power Transformer Risk Assessment
Authors: Sun Yi Yun , Wang Xin , Zheng Yi Hui , Li Li Xue , Xu Qing Shan
Published: December 2013

For fast and accurately assessing the risk of the transformer failure and getting the reliability of transformer components, it is proposed a new method based on Fault Tree Analysis (FTA) and Improved Fuzzy Analytic Hierarchy Process (IFAHP) in this paper. Firstly power transformer fault tree is established accordingly to make the complex transformer faults system subdivide into various kinds of basic types directly; Secondly, the IFAHP is designed to analyze the fault tree, so the complex system of transformer can be quantitatively described and the fuzzy judgment matrix can be established; Finally, the fuzzy consistent qualification is changed into a mathematical programming problem and Genetic Algorithms (GA) is adopted to get the solution so as to obtain the reliability of transformer components. In addition, the application result shows the effectiveness of the method above.
Novel Post-Treatment Process by La3+ Modification to TiO2 Photoanode with Enhanced Performance for DSSCs
Authors: Gao Qian Qian , Yang Song Wang , Lei Lei
Published: December 2013

Photoanodes are critical parts of dye-sensitized solar cells (DSSCs), which are composited of TCO (transparent conductive oxide) glasses and nanocrystalline semiconductor film deposited on them. Post-treatment of porous TiO2 film after sintering for the first time was important for the enhancement of the performance of DSSCs. A novel method to modify the surface of TiO2 film was investigated in our work. Photoanodes of DSSCs were treated with the isopropanol solution containing 0.05mol/L La (NO3)3. After the post-treatment, there was an obvious increase of the overall performance of DSSCs. The photoelectric conversion efficiency (PCE) reached 9.33%, with a raise of 3.3%, compared with the traditional TiCl4 thermal treating method at 70°C for 40min.
Lissajous Curve of an Auxiliary Winding Voltage Park Components for Doubly-Fed Induction Machine Electrical Faults Diagnosis
Authors: El Menzhi Lamiaâ , Saad Abdallah
Published: December 2013

In this paper, a new method for doubly-fed induction machine electrical faults diagnosis is presented. It is based on the so-called the Lissajous curve of an auxiliary winding voltage Park components. For this purpose, time domain mathematical model of a three phase doubly-fed induction machine and expressions of the inserted winding voltage and its Park components are presented. Simulation results curried out for non defected and defected machine show the effectiveness of the proposed method.
A Fault Diagnosis Method in VSC-HVDC Simulation System Based on BRBP Neural Networks
Authors: Cui Hao Yang , Xu Yong Peng , Yang Jun Jie , Zeng Jun Dong , Tang Zhong
Published: December 2013

As the feature of faulty signal in high voltage direct current transmission technology based on voltage source converter (VSC-HVDC) system is complicated to extract and its difficult to carry on the fault diagnosis. On the basis of the PSCAD simulation model of VSC-HVDC system, the DC current faulty signal is analyzed. Then, the wavelet analysis method was adopted to extract the eigenvector of faulty signal, and combined with method of Bayesian regularization back-propagation (BRBP) neural networks, the system fault was identified. The simulation results show that the method is more efficiently and more rapidly than the adding momentum BP neural network on the VSC-HVDC system faults diagnosing.
A New Supercapacitors Fractional Order Nonlinear Model
Authors: Cheng Xu , Liang Gui Shu , Liu Xin , Xu Li Ze
Published: December 2013

A simple fractional order nonlinear supercapacitors (SCs) electrical model has been established, taking into account the parameter variation, diffusion control and Faraday process. Frequency responses resulting from impedance spectroscopies around various operating voltages demonstrated that a SC exhibits a nonlinear behaviour in relation to the operating voltage. The model parameters are identified using fractional vector fitting and then a nonlinear model taking voltage dependency into account is obtained. Through building fractional order differential operator module in Simulink, the numerical solution of fractional order nonlinear calculus equation can be obtained directly. The model accuracy is verified through a comparison with the charging and discharing experimental results.
Wide-Band Modeling of Grounding Grid Based on the Fractional Order Differential Theory
Authors: Dong Hua Ying , Xu Li Ze , Liang Gui Shu , Liu Xin , Cheng Xu
Published: December 2013

Research on the wide-band modelling method of the grounding grid and the analysis of the electromagnetic transients on the grounding grid has significant practical meaning on the engineering problems, e.g. overvoltage protection, insulation coordination and electromagnetic interference and the increasing levels of capacity in the power and communication systems. This paper presents strategies which establish the equivalent circuit for computing the transient performance of grounding grid base on fractional order differential theory, which takes into account the fractional frequency characteristics of soil permittivity. In order to validate the presented method, an example is considered and the transient responses are compared with the results obtained by the method of moments.
Study on Fuzzy PI Control Strategies of Networked Control System
Authors: Xue Hua , Fan Yue
Published: December 2013

When using a remote networked control system, a network-induced time-delay is generated, which causes advert effects on the closed-loop networked control system such as performance degradation and system destabilization. For solving the time-delay in remote control system, intelligent fuzzy logic compensator is introduced in this paper to improve the traditional networked PI control system. In the full adaptive fuzzy parameter adjustment, off-line optimization and on-line adaptation are applied to the design of the controller, So that the consequent parameters can be tuned adaptively, As well as the membership functions in the antecedent part Simulation results of a networked controlled Brushless DC motor is used to illustrate the effectiveness and feasibility of the proposed fuzzy PI control scheme.
Quality Control Scheme Design on Remanufactured Engine Electronic Control Unit
Authors: Li Kun
Published: December 2013

The quality control scheme on remanufactured Engine Electronic Control Unit (ECU) was studied designed. According to the effectiveness of environmental factors exciting faults, the quality control technology and method on remanufactured ECU was proposed to meet the rigorous quality requirements on remanufactured electronic product. The temperature cycling test, random vibration test and damp heat test in this scheme were defined. After experiments, the near failures ECUs are eliminated. The testing results indicate that used engines ECUs are suitable for remanufacturing and reusing.
Research on Heterogeneous Cloud Service Model for Smart Grid Business Application
Authors: Ji Xin , Zhang Da Hua , Men De Yue
Published: December 2013

With the construction of smart grid and centralized data center, traditional information technology management mode already cannot meet the requirements on the timeliness and flexibility. Cloud computing technology can solve the complicated calculation, mass data processing, and network dynamic migration issues for electric power business, but when in the face of different business applications demand, due to the heterogeneous resources variety of applications bottleneck will be produced, difficult to achieve real "smart". In view of the smart grid application scenarios, heterogeneous resources adaptation method is given respectively for computing, storage and network resources. Makes the heterogeneous resources can be shared centrally, allocate resources on demand, unified managing, dynamic scheduling, and loaded balancing, form heterogeneous resource pool. Based on heterogeneous resource pool, build the heterogeneous cloud service model, and carried out preliminary design implementation, the availability of the model was verified.
The Empirical Study of Demand-Side Response Model Based on the Maximize Benefits under the Background of Smart Power Grid
Authors: Li Jiang
Published: December 2013

Demand-side management is a long-term strategic systems engineering which consistent with sustainable development requirements. According to the process of power companies and users participant of demand-side response, this article constructs the demand-side response with the principle of maximize benefits, while taking a regional electricity load as an example, which analysis the changing relationship between electricity price, incentive measures and users demand based on the measurements implementation of price and stimulating two demand-side responses of this area.
Slip Analysis of Wind Turbine Angular Contact Ball Bearing
Authors: Yin Yu Feng , Ding Jian Gang , Li Yong Jian , Na Ya Li
Published: December 2013

Wind machine high speed shaft bearing in high speed and light load conditions,it is prone to produce skidding.Skidding damage often becomes one of the main damage forms.According to EHD lubrication theory,this paper establishes the interacting model among rolling-elements,which includes gyroscopic and centrifugal effects,to study the skidding characteristics of angular contact ball-bearings.The model will enable engineers to improve bearing reliability at the design stage.
Forecasting Residential Electricity Based on FOAGMNN
Authors: Niu Dong Xiao , Chen Ting Ting , Wang Peng , Chen Yan Chao
Published: December 2013

This paper puts forward a residential electricity forecasting method based on FOAGMNN. Correlation analysis was adopted to select the key influencing factors of residential electricity forecasting. Finally, annual disposable income, population, households, per capita floor space, preceding electricity consumption are choosed as the key influencing factors. Through simulation example using the data of Hangzhou residential electricity consumption from 2000 to 2011, the results showed that the proposed model outperformed the other models and is suitable for residential electricity prediction.
SPIV Analysis of the Tip Vortex Evolution of a Horizontal Axis Wind Turbine
Authors: Chen Qiu Hua , Lai Xu , Zou Jin
Published: December 2013

The present paper evaluates the tip vortex evolution of a horizontal axis wind turbine model using the stereo particle image velocimetry technology. The measurements of the wake region up to 2.7 diameters downstream are first conducted using the phase locked technique based on two high speed CCD cameras. Parameters that describe the helical vortex wake, such as the velocity, helicoidal pitch and vortex vorticity, are presented at two tip speed ratios. The vortex interaction and stability of helical vortex filaments within wind turbine wake are seen throughout the measurement domain. The results show the wake structure varies with tip speed ratio, and the helicoidal pitch of tip vortex trajectory reduces while the diffusion of tip vortex is faster with increasing tip speed ratio.
Short Term Load Forecasting Based on Improved RBF Neural Network
Authors: Zhang Hong , Lei Zhi Guo , Guo Jian , Pian Zhao Yu
Published: December 2013

An improved radial basis function neural network is proposed that preprocessing is the key to improving the precision of short-term load forecasting. This paper presents a new model which is based on classical RBF neural network, combine the GA-optimized SVM radial basis function and RBF neural network. According to the date of the type, temperature, weather conditions and other factors ,The Application of combined GA-optimized SVM radial basis function is used to extract useful data to improve the load forecasting accuracy of RBF neural network. Spring load data of California were applied for simulation. The simulation indicates that the new method is feasible and the forecasting precision is greatly improved.
Design of a New Micro Single Flute Drill
Authors: Lee An Chen , Horng Jeng Haur , Tuyen Nguyen Danh , Hsiao Kuo Mo
Published: December 2013

A new micro single flute drill was presented in this study. For the convenience of developing a solid model, and doing a geometrical analysis, its geometry including the flute and flank surfaces is presented mathematically. According to the geometrical analysis, the normal clearance angles and normal rake angles along the cutting lip of the new micro dill are always invariant, and positive, respectively. Hence its cutting force in drilling is reduced. Furthermore, with only one main flute, the new micro drill gets stronger, and its cutting torque can be also decreased. Therefore it is expected that the tool life of the new micro drill is much longer than that of the conventional drill.
Keyword: New micro drill, micro drill, single cutting edge
Research and Development of Measurement System for Control Circuit Board of Residual Current Fire Monitoring Detector
Authors: Wen Xiao Xing , Li Xiu Juan , Xie Qi , Xu Hui Gang , Gu Qi Min
Published: December 2013

A novel design scheme of performance parameter automatic measurement system for residual current fire monitoring detector control circuit board based on virtual instrument technology was introduced. Hardware of the system was composed of measurement platform, industrial computer, data acquisition card and signal conditioning circuit, etc. The software developed on the LabVIEW platform takes charge of the high speed data acquisition, as well as the data processing, displaying and saving. Using the latest progress of computer control technology, network technology, communication technology and data acquisition and software technology, the system satisfied the needs of performance parameter measurement for residual current fire monitoring detector control circuit board. The overall structure of the measurement system, the structure of software, analysis process and LabVIEW program realization were introduced in detail. Practical application shows that the intelligent measurement system features with high precision, strong disturbance attenuation, high efficiency, easy to operate and maintain, and can improve the design and performance of products, which can be widely used. The system provides an effective way to design the performance parameter measurement system for residual current fire monitoring detector control circuit board.
A Novel Method of Measuring Gap and Surface Differential Used in Headlights Contour Detection
Authors: Shen Jia Xing , Dai Shu Guang , Mu Ping An
Published: December 2013

A novel method of measuring gap and surface differential was proposed to detect headlights contour in this paper. The method is based on the line structured laser sensor and robot system, and spline curve fitting was used to obtain the contour of the headlights and mold. After the fitting, the contour was resampled to get the shortest distance vector between the headlight contour curves and the mold contour curves, and through the decomposition of the vectors, the perpendicular and parallel components were obtained, and then the gap and surface differential measurement was completed.
Analysis of Power Flow on Power System with Wind Power Grid
Authors: Xu Hui Yi
Published: December 2013

With the continuous development of wind energy resources, wind power technology has been integrated into the modern power system. In this paper, according to the Power System Incorporating Wind Farm, selecting typical data distributed Power flow calculation of Built power network. According to data from the results show that grid-connected wind power system, Due to the directly affected by the influence of the wind speed size into the injection power, cause the whole trend distribution network is presented in a state of random changes, thereby affecting the network power loss of change. In order to improve the network voltage change, this paper puts forward some feasible measures to improve the network voltage method.
Research of Botnet Base on P2P Protocol
Authors: Li Yue , Fan Ya Qin , Yang Duo , Zheng Kai Yuan
Published: December 2013

Because the model of Botnet posed a threat to the network security, so this paper studies the semi distributed P2P network. Base on this, we simulate the propagation model of semi distributed P2P network and obtained a more conform to the actual status's new communication model. Through the analysis of the result, we prove the effectiveness of the honeypot detection method and flow detection method. Pseudo honeypot" detection technique model is based on the first two detection, we also simulate it and get a desired result. The conclusion has important significance for the study of network security.
Research on Unified Storage Format for Building Information Modeling
Authors: Yuan Jing Ling , Tu Rui , Yuan Yan , Xie Jing
Published: December 2013

With the constant development of global information technology in building industry, different vendors utilize their own format to store building information modeling; however the incompatibility among these formats obstructs the use and share of the modeling information. Targeting the information exchange and share in each phase of the whole building lifecycle and promoting the energy saving and emission reducing buildings, this paper introduces the information on IFC standards, then discusses the mainstream share formats (.ifc and .ifcXML) in building industry, and compares and analyzes the differences between them, in order to provide leading support for the management platform of data information on building energy efficiency.
Image Fusion Algorithm Based on Wavelet Transform and Laplacian Pyramid
Authors: Li Ming Jing , Dong Yu Bing , Wang Xiao Li
Published: December 2013

Image fusion is process which combine relevant information from two or more images into a single image. The aim of fusion is to extract relevant information for research. According to different application and characteristic of algorithm, image fusion algorithm could be used to improve quality of image. This paper complete compare analyze of image fusion algorithm based on wavelet transform and Laplacian pyramid. In this paper, principle, operation, steps and characteristic of fusion algorithm are summarized, advantage and disadvantage of different algorithm are compared. The fusion effects of different fusion algorithm are given by MATLAB. Experimental results shows that quality of fused image would be improve obviously.
Medical Image Edge Detection Analysis Method Based on Fractional Differential
Authors: Li Ming Jing , Dong Yu Bing , Wang Xiao Li
Published: December 2013

Edge detection; Fractional differential; Medical image; Noise