bluuebunny/crossref_metadata_2025 huggingface dataset:
Technical Economic Analysis on V2G Mode Shifting Peak Load
Authors: Wu Meng Jie , Liao Qiang Qiang , Zhou Guo Ding , Liu Xiao Lin , Zhang Shen Yang
Published: December 2013

As the electric vehicles (EVs) such as hybrid, battery, and fuel cell cars have become common in market, there is an opportunity to apply vehicle-to-grid (V2G) power. This article introduces the concept of V2G and uses equations to calculate the capacity for grid power from defined electric drive vehicles. Further this paper evaluates the revenue and costs for V2G mode from selling electricity into market. The results show that developing V2G mode provides electric vehicles owners and electric utilities additional revenue, stability and reliability of the electric grid, lower-cost storage for intermittent power resources.
Comparative Analysis on Emission between Hybrid and Conventional Vehicles
Authors: Wang Yong Ding , Ma Chen Qi , Pan Hai
Published: December 2013

In order to study the influence of environment which the hybrid electric vehicle made, used the simulation software advisor to the prevailing two hybrid cars: Toyota and Honda Prius snd insight engine, motor and battery of the matching calculation. And made a comparison with conventional cars. Compared to traditional cars ,the hybrid cars have obvious advantages in environmental protection.
Study on the Regularity of EVs' Charging and Discharging Group Behaviors
Authors: Zhang Yu , Fang Chen , Yang Jian Lin , Liu Shao Peng
Published: December 2013

The large scale application of EVs (electric vehicles) is an inevitable trend at home and abroad. When lots of EVs are plugged into the grid, the impact of their charging load on the grid is not negligible; while the development of V2G technology allows EVs to discharge to the grid, it provides an opportunity for improving the safety and economic operation of the grid. The paper models the specific behavior features of the bus and private EVs from the mileage, charging mode and charging time three aspects. MATLAB is used for programming, and EVs sample are randomly selected. The EVs charging and discharging behavior probability is analyzed to determine the simulation model. Last, by the practical example, the impact of EVs charging and discharging behavior on the grid is calculated, and conclusions that match the reality can be drawn.
Testing and Analysis on Building Thermal Stability in Hot-Humid and Cold-Humid Area in Summer
Authors: Liang Shuang , Yan Wang , Huang Ke , Luo Neng , Wang Shao Jun
Published: December 2013

Relative humidity in hot-humid and cold-humid area in summer is high, the sun radiation intensity is low, and the existing building thermal stability condition basic research data is absence . Select the region typical residential building, the sun radiation, relative humidity, air temperature and surface temperature were measured and recorded; Test analysis shows that typical residential house in summer in the climate characteristics the typical average indoor temperature fluctuation in the cycle is 4.3 °C,fluctuations of temperature to a larger extent, and was obviously affected by such factors as orientations and envelope constructional detail.
Airtightness and Acoustic Properties of Family House from Straw
Authors: Teslík Jiří , Zdražilová Naďa , Vodičková Martina
Published: December 2013

With regard to the current European trends in civil engineering and sustainability are still explored new building materials. In this case it is ideal to use natural materials such as straw. Its use as a building material is both ecological and economical. Excellent thermal insulation properties of straw have been known for centuries but the aim of this paper and the measurements were also demonstrate air-tightness and acoustic properties of a straw houses in the Czech Republic.
Quantum Cutting down Conversion by Cooperative Energy Transfer from Tb3+ to Yb3+ in CeF3 Nanophosphors
Authors: Gandhi Mayuri , Agrawal Nayan , Bhatia Harshita
Published: December 2013

In the present work, Cerium Fluoride (CeF3) was selected as the host material because of its High density, fast response and high radiation resistance, efficient absorption and energy transfer by host (to activator). Rare earths have been used to show the process of Quantum Cutting (QC) via energy transfer process between Tb3+ and Yb3+ incorporated in CeF3. For the synthesis of CeF3 nanoparticles codoped with Tb3+ and Yb3+ ion, co-precipitation route was employed. Different doping concentrations were prepared to study the changes that take place in the luminescence spectra of the composition. Thus, concentration dependent study of the fluorescence of CeF3: Tb3+, Yb3+ was carried out. These materials have great applications in solar cell devices as quantum efficiencies up to 200 % can be achieved.
Properties of the Dry Masonry Mixtures with Hollow Ceramics Microspheres
Authors: Semenov Vyacheslav , Rozovskaya Tamara , Oreshkin Dmitriy V.
Published: December 2013

The article is devoted to the development of dry masonry mixtures on the basis of hollow ceramics microspheres. It considers the effect of the concentration of hollow ceramics microspheres of different size fractions in the masonry mortar on physical, mechanical and technological properties of the mortar. The optimum compositions of lightweight mortars with hollow microspheres were developed and their main properties were studied as well.
Development of Masonry Components Protected against Moisture
Authors: Sedlmajer Martin , Zach Jiří , Hroudová Jitka
Published: December 2013

During construction process and life, a number of negative influences can have effect on masonry structures; moisture, which is undesirable in the masonry, can be one of such influences. The lower area of the masonry (plinth walling) is strained the most by the moisture. The paper deals with potential reduction of the effect of moisture in places, where the masonry structure is founded, through hydrophobization of walling units. Such solution of the issue of protection of the building structure against the influence of humidity should not have negative effect on the resulting masonry parameters, particularly not on the potential application of surface treatment materials. The collective influence of the surface treatment materials, consisting usually of plaster, and the actual masonry should be ensured.
Application of BIM Technology in Green Building Engineering Construction
Authors: Li Li , Wang Li Xin
Published: December 2013

BIM is a direct application of information technology in construction industry. It covers the whole life cycle of engineering construction, including project planning, design, construction, operation and maintenance. BIM improves the engineering quality, saves cost and improves production efficiency. In this paper, we will discuss the application of BIMs collaborative integrated function in engineering construction project and BIMs future application.
Gelation in Three-Phase Disperse Systems
Authors: Buryanov Аleksandr F. , Belov Vladimir V. , Petropavlovskaya Victoriya , Novichenkova Tatiana B. , Rozovskaya Tamara
Published: December 2013

The work considers the pre-requisites for the development of a scientific methodology of determination of optimum water content in hard raw mixes used for the production of high-strength concrete. The main idea of the methodology is the capillary structures hypothesis which considers the laws of formation of irregular structures under the conditions of balance of the forces among the particles in three-phase disperse systems. The structure formation under the effects of capillary cohesion in disperse systems has been studied; the capillary cohesion was considered as a factor influencing the formation of the optimum structure of raw mixes for compressed construction composites and determining the strength of the products.
Experimental Study on Properties of Different Angles of FRP Shear Reinforced Timber Beams
Authors: Dong Shi Hai , Dong Jiang Feng , Wang Qingyuan
Published: December 2013

Study of fiber reinforced plastics (i.e. CFRP, BFRP and AFRP) for rectangular beams reinforcement effect, using the FRP were 90o vertically and 45o slantingly parceled 10 rectangular timber beams shear performance, recorded specimen failure process. This paper analyzes the different FRP reinforcement plies, different reinforcement on beam properties of specimen, failure mode, bearing capacity, load-deflection relationship and strain distribution. The results showed that: FRP changed beams brittle failure mode, improve the beam bending, shear performance, ultimate bearing capacity increased by 28.2%~55.1%, the stiffness of the specimen and also improved ductility. In addition, its more effective to paste the FRP sheets vertically than slantingly with the angle of 45°. Using FRP strengthening beams the performance of the method is effective, the method can significantly improve the performance of wood. To improve the utilization efficiency of wood, expand the application range of timber provides useful reference.
The Influence of Bluff-Body Structural Parameters and Incoming Velocities on Advanced Vortex Combustor
Authors: Wang Zhi Kai , Zeng Zhuo Xiong , Xu Yi Hua
Published: December 2013

The influence of bluff-body structural parameters and incoming velocity on the cold flow field of advanced vortex combustor (AVC) has been studied, and the results show that the vortex in cavity can be the most stable and the total pressure loss can be the least when structural parameter is B2/B1=0.7, L/B1=0.8. The incoming velocity should not be too high or too low, it should be combined with specific structural parameters of the combustor, the combustion flame speed, fuel type, and the stoichiometric ratio and other factors. If AVC design is reasonable, the cavity can not only stabilize the flame, but also not be sensitive to the speed changes.
Numerical Study on the Flow and Heat Transfer for the inside of the Cylinder Type Natural Gas Heater
Authors: Guo Yun , Huang Zhi Qiang , Yang Shun Xin
Published: December 2013

The cylinder type natural gas heater is an indispensable piece of equipment in gas production, transmission, and application systems. According to the distinctive structure of the cylinder natural gas heater, the natural convection heat transfer model of both heating surface and cooling surface in the cylinder was built, the temperature and velocity field of the natural convection of the heat-transfer medium--ethylene glycol were numerically simulated. The simulation results show that the symmetrical arrangement of heating and cooling surfaces is not conducive to the formation of an effective heat flow field. Therefore, effective optimizing the layout of the heating and cooling surfaces is obviously a problem that must be solved, to help the heat-transfer medium form a well-organized flow and enhance the heat transfer.
The Study and Design of 20kW Photovoltaic Power System
Authors: Zhang Yun Bo , Zheng Wen , Zhang Hong
Published: December 2013

This paper firstly analysis the principle of three-phased photovoltaic grid-connected power system. Secondly, the 20KW photovoltaic power system will be given as an example to introduce the design strategy of photovoltaic modules. Also, the photovoltaic grid-connected inverter is designed, which includes its parameters calculation and components selection. Finally, the whole photovoltaic power system is designed and verified via the experiment. The result of the experiment shows the design is reasonable and reliable. The power system can achieve full power operation and satisfy its expected goal.
Badminton Performance Test of Wind Tunnel
Authors: Zhang Jing Hua , Wang Ren Huang , Yue Hong Wei
Published: December 2013

The badminton wind tunnel experiment quality classification was influenced by a lot of factors, such as the size of the wind tunnel wind speed Settings, the selection of the wind hole diameter size, Experiment parameter Settings of the test system software used standard and experimental error and so on. Therefore, a factorys wind tunnel experimental facility would be used by this paper, in order to make the quality of badminton, wind tunnel wind speed and wind hole diameter are researched further. Through the experiment testing, and combined with badminton wind tunnel experiment of theory knowledge, get the impact of these factors on the quality of badminton classification rule. Theoretical analysis is the same as the result of experiment, which this conclusion is indicated by the experiment that what we do. So as to choose the right wind tunnel device and system software of the test parameters Settings provide certain reference. Also the Badminton the judgment of the quality grade classification standard was provided the important reference frame by it.
Performance Study of the Household Air Conditioner under Extreme Climate Conditions
Authors: Zhao Xin , Jiang Wei Ting , Pan Wei Guo , Li Jun , Liu Su , Yang Yong Wen
Published: December 2013

This paper used physical modeling method to simulate the running state of each component of the air conditioner, got the ideal conditions of air conditionor energy consumption model and then calibrated and corrected the model of the air conditioner energy consumption by the experimental data. After utilizing the model for the performance analysis of the actual air conditioner, it was found that the extreme outdoor climate would affect the performance of the air conditioner. In summer, the electricity required to produce the same amount of cooling capacity will be 210% compared with 30°C of outdoor temperature, when the outdoor temperature is 50 °C; In winter, the drop of outdoor temperature will seriously impact on the energy efficiency of air conditioner, when the outdoor temperature is-5°C the electricity required to produce the same amount of cooling capacity will be 150% compared with 10 °C of outdoor temperature. It is of great significance that the results shown in this research contributes to the analysis of air conditioner in extreme conditions, and amended energy consumption of the model can not only forecast the performance of household air conditioners under the extreme climate but also indicate the future direction of air conditionersdesign and improvement.
Theoretical Analysis for the Influence of the Regenerative Process on the Trans-Critical CO2 Cycle
Authors: Lv Jing , Hu Te Te , He Zhe Bin , Hu Eric Jing
Published: December 2013

The trans-critical CO2 refrigeration cycle involving a regenerative process is analyzed in this paper. The thermodynamic performance of the cycles with regeneration and without regeneration has been compared. The optimal circumstance for the regenerative process set in the trans-critical CO2 cycle is given. The impact of the regeneration on the performance of the system under difference operating conditions is also discussed in this article.
Experimental Study on Performance of a Cross-Flow Dehumidifier
Authors: Niu Run Ping , Chen Jing Dong
Published: December 2013

Experiment was carried out to test heat and mass transfer performance of cross-flow dehumidifier using metal packing. The effects of air flow rate, solution flow rate and inlet parameters of air and solution on the outlet parameters were also investigated. And a great deal of data obtained from experiment was processed using multiple linear regression method. Empirical formulas were given such as the rates and efficiency of dehumidification evaluating performance of dehumidifier, which provided good reference and necessary information for further theoretical investigation.
Effect of Ventilation Systems on Stator Thermal Field of Induction Machines
Authors: Huang Cong Hui , Zhang Yang , Wu Xin Zhen
Published: December 2013

A three dimensional physical model for coupling calculation of flow and thermal transmission in induction machine is established in order to research the effect of stator ventilation on the performance of radiating with the method of finite volume element. The thermal fields of different ventilation structures under same basic size and equal total ventilation quantity of the induction machine are calculated and compared numerically. The results indicate that the addition of wind path will reduce the highest temperature in stator and cool the overhang portion remarkably.
Risk Analysis and Evaluation of Power Plant Equipment
Authors: Zhao Wei Wei , Gu Yu Jiong , Wang Cheng Cheng , Ren Zhao Xu
Published: December 2013

Because the complexity and The diversity of the fault of large-scale power generation equipment system, it is difficult to carry out the analysis and evaluation for risk of equipment failure definitely and accurately. In the present analysis, most of them are complex function formulas, and not only is it difficult to understand, but also in poor operating in practice. At the same time, it is fail to be divided according to different faults of different devices In the issue of risk classification in the present study, so that the risk classification is not reasonable. This article is based on the research about equipment failure risk assessment, and by risk factors analysis to classify the risk of different failure for different devices. Maintenance mode selection is no longer based on the device but a combination of criticality analysis, and we can propose appropriate maintenance mode in the light of different fault of different equipment.
Researches on Electronic Control System of Diesel-CNG Dual Fuel Engine
Authors: Yu Lei , Yang Qing , Zhang You Tong
Published: December 2013

Natural gas has been one of the most important kinds of vehicle fuel since the discovery of abundant shale gas storage. Operating costs of diesel engine can be reduced by replacing diesel with diesel-CNG dual fuel. The present contribution is mainly about the electronic control system of diesel-CNG dual fuel engine. Hardware and software of the electronic control system were designed. Two control strategies named equivalent power control strategy and diesel-saving control strategy were put forward for different control targets. Furthermore, these two strategies were testified by experiments conducted on engine test bench. Results show that average natural gas replacement could up to 70%. Comparing with diesel engine, fuel consumption of diesel-CNG dual fuel engine can be reduced significantly and the power increases slightly also. Both power and economy performances of the engine are improved.
An Independent Component Analysis Based on Sliding Window Statistics and its Application to Power Plant Equipment State Monitoring
Authors: Zhao Yue , Si Feng Qi , Xu Zhi Gao
Published: December 2013

Traditional condition monitoring methods are not suitable for the nonlinear operation parameters and time-variable operation conditions. We propose an independent component analysis method based on sliding window statistics (SSWICA). This method uses statistics in sliding windows of parameters as input samples, then uses a N-step forward sliding window ICA method to modeling. Then we monitor the operating state of the equipments by observing whether the SPE index of real-time parameters exceeds the control limits. SSWICA is applied to condition monitoring of condenser in 600MW unit, comparing with traditional ICA monitoring methods based on sliding window. The results show SSWICA can accurately reflect current operating state and related changes of condensers state parameters, recognize steady, unsteady and fault conditions effectively. It is valuable for engineering practice and suitable for the application to equipments condition monitoring in power plant.
Research on Simulation of Urea-SCR Injection System for Marine Diesel Engine
Authors: Xiao You Hong , Chu Zhen Hao , Tian Xin Na
Published: December 2013

The mixing degree of ammonia and exhaust gas has significant effect on the NOx conversion efficiency of SCR (selective catalytic reduction) system. It is essential to investigate the structure of urea nozzle since it considerably impacts the atomization of urea water solution. This paper simulated the process of urea spray by the software FIRE and analyzed the influence of spray characteristics such as nozzle hole number, nozzle hole chamfering as well as the spray angle on the atomization of urea water solution. Simulation results can indicate the optimal nozzle for a certain circumstance which is beneficial to the engineering design.
Online Decision Support Index System Suite for Limiting Short Circuit Current
Authors: Wang Li Wen , Tang Bi Qiang , Pan Ling Ling , Shi Fei , Liu Jun
Published: December 2013

Topology adjustment is a main measure to limit short circuit current, but changes of power grid structure might bring deep impact on power system operation. Measures to limit short circuit current are difficult to apply online due to unable to completely evaluate its safety and feasibility. This paper presents an on-line decision support indicator system, which applied to evaluate online short circuit current level of power grid. Based on practical power grid model and typical cross-section, short circuit current level under the current and future maintenance mode is analyzed, decision support to limit short circuit current is given, and the effectiveness and feasibility of limiting measures are evaluated. Analysis results show that the index system is reasonable.
Smart Power Meter System Based on ZigBee
Authors: Cheng Zhi Qun , Kang Lun , Cheng Yong
Published: December 2013

The Smart power meter system based on ZigBee technology is successfully developed in the paper. The EM250 SOC chips are adopted to develop the wireless communication modules with ZigBee protocol. Parsing the AT command, encryption and such more basic function, the two different and independent program framework for the ESP and IHD(In-Home Display) have been worked out except finishing the data transmission. A smart wireless network based on ZigBee has been established. The home and outdoor testing have also been implemented too. The measured results show that a coordinator can support more than 500 nodes and communication distance reach more than 1000 meter outdoor and more than 50 meter from home to outdoor through the two walls.
Test Method for Resistive Current of Arrester for Cable Line Based on Phase Search
Authors: Pang Dan , Wang Zhen Hao , Han Xiao Juan , Zhang Xi Lin , Wang Chao Bin
Published: December 2013

Resistive monitoring method for conventional arrester is not applicable to cable line and it is also not easy to get access to voltage signal. In this thesis, a new method for testing resistive current is adopted, in which the only job is to collect the total leakage current of arrester, simulate a reference signal based on total current information, conduct phase shift to realize phase correction and find out the phase of capacitive component and resistive component, and thus the test on resistive current of arrester for cable line is completed.
Development of Relay Device in Monitoring Data Management of Cable Circulation in Urban Power Grid
Authors: Wang Zhen Hao , Pang Dan , Han Xiao Juan , Zhang Xi Lin , Wang Chao Bin , Gu Huai Guang
Published: December 2013

The monitoring points of cable circulation in cities are relatively scattered. The on-site collection devices restricted by the power supply, installation site and communication distance are usually unable to store large amounts of data or transmit data over a long distance. In this thesis the relay device of data management is developed, realizing the management and sorted storing of the data of the collection devices of close-distance wireless receiving data, and sending the data to remote places through the GSM/GPRS network. Therefore the scattered data can be transmitted to computer analysis and management system over a long distance after centralized processing of scattered data and long-distance data monitoring and comprehensive analysis can be realized.
Key Words: Cable, Circulation Monitoring, Relay, Mega64
The Application of Safety and Stability Control Device in Middle of Henan Power Grid
Authors: Zhang Li Hua , Wang Hui Lin , Gan Hong Qing
Published: December 2013

Safety and stability control device is the secondary line of defense of power system stable operation. Firstly, this paper proposed the requisite of the regional safety and stability control system installed in Wuzhou 500kV switching station and the other two stations which belonged to the middle Henan power system. And then, it presented the components and elaborated control strategies of the system. It listed the situations of the united testing, at last, it summarized notes of this safety and stability control system in daily operation.
Study on the Calculation of Power Grid Asset Utilization Index
Authors: Lei Guang Yu , Zeng Yuan , Zhao Cong
Published: December 2013

As the using quality of power grid asset becomes the focus of concern, the reasonable power grid asset utilization index is needed. The paper discusses the researching level of domestic and foreign power grid assets utilization and gives a brief analysis of the typical factors which have great influential on the utilization of power grid asset. According to safety and network structure requirements during the operation, the traditional power grid asset utilization indices were improved. Finally, the paper selects the typical 10kV distribution lines to conduct the calculation of utilization, and gives some analysis and advice according to the results.
Research of Discharge Characteristics of CO2 Gas in Small Distance
Authors: Wang Quan , Wang Huan , Xiang Qiong
Published: December 2013

In order to find a new kind of insulates gas to substitute for SF6 gas, a discharge device has been development with shifter electrodes and adjusts distances automatic. Uniform electric field, non-uniform electric field had been achieved in this discharge device. The power-frequency voltage-withstand test of CO2 gas has been taken in these three kinds of electric field. In this test, data of breakdown voltage were obtained under different pressure and distances of electrodes with 99.99% purity of CO2. It can be seem from these data that the value of breakdown voltage is positive correlation to pressure and distances of electrodes. Whats more For uniform electric field, the dielectric strength meet the requirement of power-frequency voltage-withstand of 110kV gas insulation device when the distance of test electrodes no less than 30mm. For non-uniform electric field, the dielectric strength of gas insulation of CO2 gas has little difference until the pressure increased to 0.5MPa. According to the data of power-frequency voltage-withstand test it can be conclude that the 0.5MPa is a key indicator to improve the insulating properties.
Marine Asynchronous Propulsion Motor Parameter Identification Using Dynamic Particle Swarm Optimization
Authors: Liu Si Yuan , Liu Yan Cheng , Wang Chuan , Ren Jun Jie
Published: December 2013

This paper proposes a new application of dynamic particle swarm optimization (PSO) algorithm for parameter identification of vector controlled asynchronous propulsion motor (APM) in electric propulsion ship. The dynamic PSO modifies the inertia weight, learning coefficients and two independent random sequences which affect the convergence capability and solution quality, in order to improve the performance of the standard PSO algorithm. The standard PSO and dynamic PSO algorithms use measurements of the mt-axis currents, voltages of APM as the inputs to parameter identification system. The experimental results obtained compare the identified parameters with the actual parameters. There is also a comparison of the solution quality between standard PSO and dynamic PSO algorithms. The results demonstrate that the dynamic PSO algorithm is better than standard PSO algorithm for APM parameter identification. Dynamic PSO algorithm can improve the performance of ship propulsion motor under abrupt load variation.
Research of a Hybrid Controllable Reactor
Authors: Song Meng , Shen Shi Feng , Wang Da Da , Cao Kun Nan , Dong Hong Da , Wang Li Qin , Hao Ceng Ceng , Feng Qiang , Li Xiao Yu , Ren Li
Published: December 2013

With the development of high voltage long distance transmission and the expansion of the capacity of power grid, it is becoming more and more important to develop new device to realize reactive power compensation. A hybrid controllable rector is developed in this paper. The principle is introduced in detail and a 220V single phase prototype is made. Relevant experiments have been done to test its adjustment performance. Results show that there is no harmonic exist. Hybrid controllable reactor can realize many adjustment levels between 0 to 100%. Also, the shortage is given in the paper which is needed to research in the future work.
Application of SENLAN SB60 in Flow Variable Frequency Speed Control System
Authors: Liu Jiao Yue , Yang Ju Qing , Ma Lin
Published: December 2013

The frequency speed control system in flow control based on SENLAN SB60 frequency converter is made up of input set value and actual value which is the feedback voltage signal given by flow sensor, then adjusted by process PID automatic control, changes output frequency to regulate the speed of three-phase asynchronous motor to achieve the purpose of speed regulation, thus the tank's flow control can be obtained.
Experimental Testing of Hydroinsulating Injection Screens
Authors: Melichar Jindřich , Drochytka Rostislav , Černý Vit
Published: December 2013

One of the most widespread method of redevelopment of wet masonry is additional creating of hydroinsulating screen in the material. This method has many advantages. The biggest advantage is fact, that building can be repaired from inside without damaging its statics and saving it from being demolished, thus sparing the environment. In comparison to other procedures its application is quick, easy and has excellent final efficiency. Main object of this article is testing of application and total functionality of individual screens in masonry.
Simulation and Research on the Improved Boost Circuit Based on Multisim
Authors: Bu Xiang Yun , Zhang Ze , Zhang Dong Xu
Published: December 2013

In this paper, the working principle, the structure and the characteristics of an improved Boost circuit are introduced briefly, in addition, the simulation model of the improved Boost circuit is established using Multisim11.0, a simulation software of NI company. The results of the simulation verify the validity of the improved Boost circuit theory and establish the simulation model with optimal parameters. It also can be seen from the experimental results that the improved Boost circuit has a higher step-up ratio with the premise of no hardware upgrade. In general, the Multisim11.0 software plays an important role in the design of electronic circuits.
Genetic Based Reinforcement Learning Load Control for Smart Grids
Authors: Li Xin , Yu Dan , Zang Chuan Zhi
Published: December 2013

As the improvement of smart grids, the customer participation has reinvigorated interest in demand-side features such as load control for domestic users. A genetic based reinforcement learning (RL) load controller is proposed. The genetic is used to adjust the parameters of the controller. The RL algorithm, which is independent of the mathematic model, shows the particular superiority in load control. By means of learning procedures, the proposed controller can learn to take the best actions to regulate the energy usage for equipments with the features of high comfortable for energy usage and low electric charge meanwhile. Simulation results show that the proposed load controller can promote the performance energy usage in smart grids.
The Effect Research of Smart Grid to Residential Users Intelligent Response Behavior
Authors: Li Liang
Published: December 2013

With the deepening of smart grid construction, it is necessary to fully study the intelligent response behavior of residential users, enhance the power grid comprehensive service capabilities and meet the requirements of interactive marketing. According to the model analysis of residential customers comprehensive response behavior, we can get the steady-state situation of residents overall responsiveness, which is able to judge the residents responsiveness level. The homogeneity trend of residential electricitys responsiveness is very strong, as a consequence, we should establish adequate incentives to tap the potential responsiveness of the residential users.
Research of DC Micro-Grid Photovoltaic Energy Storage System Control Strategy
Authors: Liu Li , Wang Yue Chao , Shi Song Jie , Liu Chang
Published: December 2013

This document focuses on the DC micro-grid photovoltaic energy storage device, the design of energy storage systems are optical storage hybrid power system which composes the photovoltaic array, battery pack, management systems, photovoltaic inverter, load and power grid. According to the characteristics of the battery and the development of the switching device control technology, the charging and discharging control strategy of battery is studied. In this paper, three-phase inverter is based on the space vector control mode that is called SVPWM, after introducing the basic principle and synthesis method of SVPWM, the on-grid and off-grid system working mode control strategy is studied. Finally the control theory develops the inverter used in the optical storage complementary power generation system, and the article builds test platform to test system, verifying the validity of the control strategy.
Modeling and Simulation of Compressed Air Energy Storage (CAES) System for Electromechanical Transient Analysis of Power System
Authors: He Lei , Xia Tian , Tian Fang , An Ning
Published: December 2013

CAES system electromotor transient model was established from the view of equipment and the grid interface, based on Power System Analysis Software Package (PSASP). The model was divided into energy storing sub-system model part and generating sub-system model part, and the normal and abnormal dynamic characteristics after CAES connected to the grid were simulated bythis model. The validity of this model was theoretically verified by applying it into example systems and testing.,according to detecting the system responses caused by power system contingency and the sudden change of CAES characteristics. This model provides a basic platform for studying CAES system characteristics, and also provides necessary technical support to the security and stability of power system operation when integrating renewable energy into the grid.
Load Scheduling Strategies Based on Dynamic Price in Smart Grid
Authors: Wang Kang Qi , Tan Xiao Bin , Yu Shan Jin
Published: December 2013

The combination of renewable energy and dynamic electricity pricing is an important feature of modern smart grid. Due to the dynamic electricity price and the intermittency nature of renewable energy, a local small-scaled smart grid (microgrid) needs to intelligently schedule various work loads to determine their start and end time in order to maximize the utilization of renewable energy and minimize the total electricity cost. Since the workload that can be shifted/scheduled is classified into interruptible load and non-interruptible load, in this paper we present two novel recursive scheduling strategies based on dynamic programming for both categories. The simulation experiment demonstrates that our strategies can effectively save energy expenditure and increase the proportion of renewable energy in overall energy consumption.
Research on Key Indicators of Operational Warning System of Grid Enterprises Based on BSC-ISM Method
Authors: Sun Yi Xin
Published: December 2013

Mainly from the perspective of power grid enterprise, this paper analyzed the impact about operational factors based on balanced score card (BSC) analysis framework, sorted order of key external environmental factors by establishing interpretative structural model (ISM) , put forward to key indicators of operational warning system, and examine the result by principal component analysis. As a result, grid enterprise should pay more attention to 11 factors from 32 operational indexes.
The Research of BP-PSO Optimization Method in Electric Power Market Analysis and Forecast
Authors: Ma Li Xin , Peng Hua Kun , Li Yuan , Yuan Shu Juan
Published: December 2013

The classification and prediction of load is very important, in the power market .In order to improve the accuracy and speed of forecast, it is proposed that the mixed algorithm of particle swarm and back propagation network and model. And model is established on the basis of one city electric power bureaus electric power load data. Using the PSO - BP algorithm to the load for forecasting .According to the results of prediction, this method converges fast, prediction accuracy improved significantly. Application in the power market analysis and forecasting have very good effect and prospect.
Wind Power Output Prediction with BP Neural Network Combining Genetic Algorithms
Authors: Pan Xue Tao , Qu Ke Qing
Published: December 2013

While having been successfully applied in forecasting with many researches, back Propagation (BP) neural network are with problems such as permutation and premature convergence due to dependence on initial connection weights or other parameters. This paper investigates Genetic Algorithms (GA) evolved BP network and its application to wind power forecasting. Sample analysis with daily wind output data demonstrates that GA-based neural network is with better performance.
500kV Substation Service Power System Modeling Research Based on Least Square Method with Parameter Optimization by SPO
Authors: Chen Chang Ming , Zeng Jiang , Zhang Xiang Hua
Published: December 2013

EHV substation service power is an important load in the power grid which is meaningful to be examined for the energy saving and emission reduction of the power grid. Based on the analysis of EHV substation service power and the improvement of the least square method, this paper get a new set of optimization which is is highly general and can reach high accuracy.
The Application of Analytic Hierarchy Process (AHP) in the Power Grid Planning
Authors: Su Shi Wei , Xiong Wei , Ren Qiao Lin , Li Bo , Sun Wei Jun
Published: December 2013

In order to solve comprehensive decision problem which exist in power grid planning, Analytic hierarchy process (AHP) is applied to distribution network planning is put forward to the selection of alternatives. Based on the actual case, Established hierarchical structure model and the attributes decision table, Form a judgment matrix one by one, then Calculate the synthesis weights and achieve the decision results.The results show that analytic hierarchy process can better combining expert experience and quantitative calculation, It is very well Solution to the comprehensive evaluation of the distribution network planning decisions. It is a practical solution of distribution network planning.
A Power Quality Study of Metro Transit Railway Based on Field Measurement
Authors: Pan Ai Qiang
Published: December 2013

Metro Transit Railways (MTRs) provide pubic convenience, but also bring power quality impact on power grid. Based on the field measurements, this paper discusses and analyzes the power quality characteristics of MTRs in Shanghai. In the terms of harmonics, voltage flicker, voltage unbalance, voltage deviation, frequency deviation and transient events, numbers of indicators are investigated to explore the power quality characteristics and existing problems of MTRs. Although harmonics are still the main problem impacting of MTRs, other power quality indicators comply with the restriction of national standards. Besides, the line charging reactive power is a common issue and transient power quality events occurs intermittently. The paper presents the corresponding proposal, which is instructive in power quality management of MTRs in cities similar as Shanghai. .
Framework Design of Provincial Electric Power Company Operation Monitoring and Decision-Making Simulation
Authors: Gao Zheng Ping , Luo Hui , Pang Jiniang , Jiang Hao
Published: December 2013

The framework and functions of Soft Science Laboratory about provincial electric power company operation monitoring and decision-making simulation are introduced. Based on the theory of recognizing-analysis-tracing-handling, a network topology which reflects the operation status on enterprise business flow and performance flow is put forward. Through monitoring the key indicators on the network topology, abnormal changes are detected. Combined with analyzing external policies, the Soft Science Laboratory makes a prediction and a timely warning. And it assists the leadership of the company to make corresponding decisions in order to improve the company's lean operation level.
Electric Power Informatization of China: A Review
Authors: Tang Ping Zhou , Liu Jun
Published: December 2013

To introduce various kinds of information technologies and suitable modes into the power industry, is of great significance to the development of today's power enterprises. In this paper, the development of the informatization of electric power industry in China is reviewed firstly. Then, the information engineering, regulations and prospects are introduced in detail. Finally, the problems occurred in its development are analyzed and future prospects are proposed.
Study on Stability Improvement of Wind Farm Integrated to Weak Grid by VSC-HVDC
Authors: Bian Xiao Yan , Hong Li Jun , Fu Yang
Published: December 2013

Reactive and active power variation of large scale wind farms always lead to the instability of voltage and frequency. To solve this problem, this paper proposed a method of joining with frequency and voltage control loop of Voltage Source Converter HVDC (VSC-HVDC). Control loop of VSC-HVDC converter WFVSC (Wind Farm Side VSC) and GSVSC (Grid Side VSC) were detailed designed. By the frequency loop of WFSVSC, transient stability is greatly improved. Finally, based on the DIgSILENT/Power Factory simulation, the results show its validity and effectiveness.
Integration of the Local Wisdom of Natural-Dyed Mud-Treated Silk in Thailand for Creative Economy
Authors: Makhunton Suphalak , Chantachon Songkoon , Phothibat Phanat
Published: December 2013

The present research compared minerals contained in mud from different sites. These were analyzed by atomic absorption spectroscopy: AAS. It found the highest quantity is iron, zinc in second, lead in third, copper in fourth. The study results show that silk threads with and without mud treatment were not so different in color durability towards light, color durability towards scrubbing, and color durability towards washing. We also found that crease recovery capacity of mud-treated silk cloth was better than that of silk cloth without mud treatment. Hence, the mud treated silk is more suitable for the development of Thai garment.
Dynamic Performance Simulation Analysis and Experimental Research of Ball Cage Patterned Constant Speed Universal Joint Based on Workbench
Authors: Cai Yun Guang , Shi Yao Chen , Li Yan
Published: December 2013

This paper used the 3d modeling software to establish SOLID model and simplified it. And it used ANSYS workbench to make the simulation analysis on dynamic performance of the universal joint. Compared undamped free vibration modal analysis with the inherent frequency measurement experimental results, to verify the accuracy of the finite element model, and prove its no resonance phenomenon.
Comparison of Thresholding and Edge Detection Segmentation Techniques
Authors: Dong Yu Bing , Wang Hai Yan , Li Ming Jing
Published: December 2013

Edge detection and thresholding segmentation algorithms are presented and tested with variety of grayscale images in different fields. In order to analyze and evaluate the quality of image segmentation, Root Mean Square Error is used. The smaller error value is, the better image segmentation effect is. The experimental results show that a segmentation method is not suitable for all images segmentation.
System for Measuring the Burst Point Time Base on APD
Authors: Zha Bing Ting , Zhang He , Zhang Xiang Jin
Published: December 2013

Aiming at the burst point time measuring device cannot timely show the burst point time measurement situation, a new measuring system was designed. The pulse signal when the ammo was outing of the muzzle and exploding was detected by APD, the light pulse was converted to voltage pulse through an amplifying circuit. The timing display module was designed, the timing circuit got the voltage pulse and timing, and then the burst point time would show on LCD. All the photoelectric detector module was fixed with the special mechanical properties. The system could increase the maximum detection distance effectively, improve its detecting precision, and display the burst point time immediately. With the simulation experiment, the system had no failing to get the burst point time, and owned a stable performance. This design can provide a reference for the optimization and improvement of the burst point time measuring device.
Research on Image Fusion Based on Pyramid Decomposition
Authors: Li Ming Jing , Dong Yu Bing , Wang Xiao Li
Published: December 2013

Different objects could be analyzed by use of pyramid decomposition of image. Image fusion algorithm based on pyramid decomposition of image is multi-scale, multi-resolution method. Its process is completed on different scale, different resolution and different decomposition layer. Compared with spatial fusion method, fusion effects improve obviously. In this paper, principal of pyramid decomposition and process were introduced, and simulation results of image fusion based on Laplacian pyramid, gradient pyramid, ration pyramid and contrast shows that image fusion based on pyramid decomposition is improve obviously.
The Review on the Topology of Battery-Supercapacitor Hybrid System Applied into the Real-Time Wind Power Suppression
Authors: Yu Peng , Li Guang Lei , Zhang Yong , Cheng Yan , Sun Shu Min , Zhao Peng
Published: December 2013

The energy storage technique is one of the most effective means for the real-time wind power regulation. Firstly, this paper discussed the operation mode of energy storage system for real-time wind power regulation. At the same time, we proposed that the energy storage system applied into the real-time wind power regulation should be of the properties of high power density, high energy density and long cycle life. By analyzing the properties of battery and supercapacitor, we arrive at the conclusion that the battery-supercapacitor hybrid system obtains the enhanced characteristics to meet the performance requirement for energy storage system. In order to achieve the real-time wind power suppression, we carried out a comparative research on the topology of battery-supercapacitor hybrid system. The operation mode of each topology was discussed. From the standpoint of practical engineering, the merits and deficiencies of each topology were explored.
License Plate Recognition Based on Neural Network Algorithm to Improve Research
Authors: Liu De Yong , Song Hong , Pan Quan
Published: December 2013

with the development of intelligent transportation technology, which all countries are suitable for their own license plate recognition system is developed. But because of the CCD camera Angle problem will make license plate image tilt; Segmentation after do not match the characters in size and character discontinuity, led to license plate recognition rate is not high, speed slow, reduce the real-time performance of the system. In order to improve the rate of convergence, the recognition rate presents a license plate recognition algorithm based on BP neural network. First put the image correction, segmentation of character normalization processing and eliminate the unfavorable factors, then puts forward characteristics of characters input for training the BP neural network. By setting the network weights and training transfer function, improved algorithm to improve the recognition rate of the system, as well as the real-time performance.