bluuebunny/crossref_metadata_2025 huggingface dataset:
Control System Design for a Manipulator Model
Authors: Zhou Peng
Published: February 2014

Manipulator as a controlled object is often applied in industrial production and processing in the field of automatic control. It can replace worker achieve a variety of work, such as transportation of workpiece material, components assembly, cutting, spraying, etc. This design is based on the object teaching experiment device of manipulator THWJX - 1.
BLDC Motor Sensorless Control System Based on ADSP-BF548
Authors: Wang Hui
Published: February 2014

In this thesis , the control strategy based on sensorless BLDCM(Brushless DC Motor) has been researched.A control system for BLDCM operating on ADSP-BF548 has been given.
we focus on studying the control strategy of sensorless BLDC motor based on back-EMF detection, and present a control system for BLDC motor based on ADSP-BF548 special for motor control.
The calculation method of back EMF in BLDC motor was deduced and the hardware circuit of line voltage detecting was designed. A pre-position starting tactics based on back EMF detection and a tactics of phase converting by postponing back-emf-zero-crossing detecting was designed. The signal wave was filtered by postponing back-emf-zero-crossing detecting when back-emf-zero-crossing had been detected. To release the phase delay caused by hardware filtering, a phase compensation algorithm has been designed. The PID adjusting algorithm and other strategy are designed in this program. Experimental results show that the control system has good speed adjusting performance and runs stably.
Time Step Method of Computer Simulation Process Control
Authors: Yao Ming Hai , Chen Xiao Ji , Zuo Lei
Published: February 2014

With the development of information technology, computer simulation technology has become a necessary mean for many complex systems analysis, design, testing, evaluation and other work. Time step method to carry on the research is applied in this paper according to the situation of simulation on time process control complex for computer. First, time step method mechanism describes by graphics; Then, we can research on the simulation of process control procedure, including the system's entity scan, all kinds of events scan, entities and events to combine scan; Finally, we can study on the same time step method that usually used on the computer simulation of process control. Content of this study provide technical and methodological support for computer simulation. With the deepening understanding for computer simulation technology, computer simulation of process control based on the time step method is bound to get a wide range of applications.
Research on Emotion Body Language Model of the Humanoid Robot
Authors: Zhang Yong De , Li Shu Tong , Jiang Jin Gang , He Tian Hua
Published: February 2014

In order to improve the personification of human-robot emotion interaction, this paper based on the Euclidean space emotion model and Ekman theory of emotion, deduces the general formula of emotion characteristic value, establishes a improvement model of robot which can express the robots emotion through the body language. The general formula of emotional feature value make the models suitable for the expression of various emotions, and through body language to express the emotions, improves the emotion expression model generality and adaptability.
The Ergonomics Research of the Joystick in Excavator Cab
Authors: Jin Xin Qin , Zhang Jian Yi , Liu Yu Hong
Published: February 2014

The ergonomics research of the joystick in excavator cab is a problem which requires immediately solution in our country. In this paper, we come to a conclusion that the improved cab takes shorter time and less muscle activity than the previous cab which means that the improved cab have advantage to the previous one in comfort and work efficiency.
Research on Current Feedback Drive Control Technology of Injector Solenoid Valve
Authors: Liu Zhen Ming , Ouyang Guang Yao , Zhang Ze Long
Published: February 2014

In order to develop drive circuit for high pressure common rail injector solenoid valve, analysis the model of drive circuit and study the relation between voltage and electromagnetic response of solenoid valve. The controllable BOOST circuit was designed to provide the high voltage helping to improve electromagnetic response, and high and low voltage time-sharing driving circuit was designed based on current feedback control. Drive current can be adjusted automatically according to the peak current and holding current, with better consistency of peak current. The result of driving experiment for certain injector shows that: the new drive circuit has fast response, with only 0.045ms rising time for drive current reaching the peak value 22A, and peak current has good consistency.
The Application of MATLAB for Fuzzy Control System Simulation
Authors: Xu Xian Qiu
Published: February 2014

The design of fuzzy control system is one of the important problems of the application of fuzzy control system. And the system simulation is an important step in the design of and the necessary guarantee. This paper briefly introduces the MATLAB language, the fuzzy logic toolbox, and SILMULINK toolbox. Then the examples, this method overcome the traditional in c language simulation of complex and inconvenient shortcoming. It is easy to fuzzy control system simulation, direct and fast. Finally also introduced several methods of create SILMULINK user s function module.
Adaptive Attitude Control on Multiple Independently Targeted Reentry Vehicles (MIRV)
Authors: Chen Xing Yu , Li Fan , Zhao Jian Hui , Fan Zhao Long
Published: February 2014

Based on the characteristics of releasing loads for many times, the attitude dynamics model of MIRV has established by using the Rodrigues representation, and we proposed a method of indirect multi-model adaptive attitude control. It was proved that the adaptive controller we designed can ensure the control system globally uniformly and bounded stable according to the Lyapunov stability theory, and the effectiveness of the controller was demonstrated by the numerical simulation results.
A Novel Automatic Extraction Approach of Pollutants for Mobile Camera
Authors: Xu Yan , Xu He , Wang Yan Tao , Gao X.Z. , Xue Kai
Published: February 2014

Rapid and automatic extraction of pollutants is of great importance for mobile camera in real-world scenarios. In the moving process of robot, the camera is treated as dynamic background, and the pollutants on the camera are treated as static target. So as to realize the detection of static target in dynamic scene, this paper presents an automatic extraction algorithm for pollutants based on frame difference accumulation. Firstly, this algorithm can determine whether pollutants exist or not by the overall trend of gray histogram of the cumulative frame difference images. And then if existing pollutants, Otsu algorithm was adopted to adaptively calculate threshold to convert the gray image into binary image. In this paper, analysis of the important parameters of the algorithm - cumulative frame number and frame difference threshold was implemented. Moreover, feasibility of the algorithm was verified by experiments on the automatic extraction of pollutants for gun-type camera.
Three-Loop Autopilot Frequency Characteristic Measurement
Authors: Chu Hai Rong , Liu Bo , Zhang Yue
Published: February 2014

In order to measurement frequency characteristic of the missile three loop autopilot, three loop autopilot system model of the missile pitch channel was established. Then the autopilot system open-loop model was analyzed , and also open-loop frequency calculation formula was deduced. On the basis of the autopilot system model, half physical frequency characteristic measurement system was built, and the experimental data were processed by using correlation analysis method. Experimental results shows that when the time delay of measurement system was compensated, three loops autopilot actual cut-off frequency was 47.5rad/s, phase margin was 93°, amplitude margin was infinte, compared with the theoretical value, errors was less than 5%. The correctness of three loops autopilot frequency characteristic measurement method was verified.
MATLAB-Based Comparative Furnace Temperature Control Algorithm and Simulation
Authors: Zhang Xiao Yun
Published: February 2014

Temperature control is critical temperature and the temperature of the two aspects. Temperature measurement is based on temperature control. However, due to the control object becomes more and more complex, temperature control, there are still many problems. In this paper, based on the use PID, Smith predictive control, Dalin algorithm comparative study of three algorithms for industrial resistance furnace temperature control system computer simulation design, and the use of simulation software MATLAB / SIMULINK simulation of the control algorithms, but also on advanced control algorithm is studied.
Fault Diagnosis Based on IGA-SVMR for Satellite Attitude Control System
Authors: Zhao Shi Lei , Liu Yu Peng
Published: February 2014

Support Vector Machine Regression is a nonlinear modeling method with a simple structure and shows excellent performance compared with other nonlinear-linear regression methods. Unfortunately, most users always select the SVMR parameters by rule of thumb, so they frequently fail to get the optimal model. This paper propose to use the immune genetic algorithm to adjust the SVMR parameters and use the RMSE of the cross validation as the fitness of IGA. At last, this method was applied to modeling satellite attitude control system to detect the faults of the system. Simulation shows the high fitting precision to the system models which insures the correctness of the fault detection.
Temperature Control in High Precision by PID Based on LabVIEW
Authors: Tian Cheng Qi , Lv Xin , Yang Hua Min
Published: February 2014

A PID temperature control system was designed with the LabVIEW graphical programming language and the PID toolkit. Data collection, PID control, data record and data check were experimented to a practicable instrument with the purchased programming power supply and data collection record system. The hardware and software of the computer with the virtual instrument system was proofed to be practical and the smooth control of the system temperature with the accuracy of 1 was available.
Feasibility Study on the Application of Dielectric EAP in Fuse
Authors: Zhu Jiang , Li Tao , Li Chen , Li Xiao Chen
Published: February 2014

Based on the analysis of basic dielectric EAP deformation and generation principle of dielectric, introduce the dielectric EAP actuator depends on the circuit implementation drive action and according to the dielectric EAP material has performance electrified deformation output force for missile aerodynamic drag characteristics, analyzes the feasibility of the application of dielectric EAP in the fuse, and puts forward the dielectric EAP used in Missile Fuse quasi research methods and technical route to take.
Design of Brick Machine Control System Based on PLC
Authors: Ye Han Min , Sun Qian Ting , Lu Shi Qin , Liu Xiao Fei
Published: February 2014

By analyzing the technical requirements of cement brick machine control system, this paper put forwards a plan utilized PLC to realize the whole automatic control as the control core in making bricks. Practical technology production indicates that the hardware design method and the software compiling technique in this paper have achieved the design objective.
Application of Q Learning-Based Self-Tuning PID with DRNN in the Strip Flatness and Gauge System
Authors: Jiang Yu Lian , Liu Jian Chang , Tan Shu Bin
Published: February 2014

In view of the process of automatic flatness control and automatic gauge control that is a nonlinear system with multi-dimensions, multi-variables, strong coupling and time variation, a novel control method called self-tuning PID with diagonal recurrent neural network (DRNN-PID) based on Q learning is proposed. It is able to coordinate the coupling of flatness control and gauge control agents to get the satisfactory control requirements without decoupling directly and amend output control laws by DRNN-PID adaptively. Decomposition-coordination is utilized to establish a novel multi-agent system for coordination control including flatness agent, gauge agent and Q learning agent. Simulation result demonstrates the validity of our proposed method.
Design of FPGA Image Acquisition System for Search-Rescue Robot Navigation
Authors: Wang Peng , Li Ji Xiang , Zhang Yuan , Li Xin
Published: February 2014

Considering the influence of the environment for the search-rescue robot to perform tasks, design scheme of the acquisition module for vision navigation system was determined. In the design, FPGA ping-pong operation method was used. The EP4CE15 main control chip module was completed with module method, and the software design of the system was completed, including Quartus II image acquisition project navigator and Nios II system configuration. Finally, the simulation of data transfer was carried on. Simulation results show that the embedded real-time image acquisition is stable.
A New Sliding Mode Observer for the Sensorless Control of a PMLSM
Authors: Lu Hua Cai , Ti Juan , Sun Lu Lu , Wei Li Sheng
Published: February 2014

In order to achieve sensorless control for permanent magnet linear synchronous motor (PMLSM) direct drive system, speed and position of the motor must be estimated. A new high speed sliding mode observer (SMO) is proposed for a PMLSM based on the sliding mode variable structure theory. A Sigmoid function is used for the SMO as a switching function of the control law, eliminating sliding mode chattering and improving its response rate. Simulation results show that the proposed SMO based on Sigmoid function is capable of estimating speed and position of the motor accurately and rapidly, and the proposed PMLSM sensorless control system has a good dynamic response.
Research on the NPC Three-Level Inverter Fault Feature Extraction Method Based on Wavelet Analysis
Authors: Hua Rong , Ji Ping Ping
Published: February 2014

This paper study a fault feature extraction method based on wavelet packet transform, using this method to extract fault information of output signal in the NPC three-level inverter fault. After analysis the structure principle of NPC three-level inverter and the wavelet packets fault feature extraction algorithm, brings up a fault feature extraction procedure of NPC three-level inverter based on wavelet packet transform. Through MATLAB simulation experiments, prove the rationality of wavelet packet transform in fault feature extraction, and the reliability in intelligent fault diagnosis.
A Method to Estimate Voltage Sag Caused by Transformer Excitation Inrush Current
Authors: Wang Jin Hao , Yang Chao Ying , Mu Guang Qi , Wu Xiao Qin
Published: February 2014

Due to excitation inrush current, no-load transformer accesses system can cause different degree of voltage sag. Therefore presents a method to estimate voltage sag caused by closing no-load transformer. Firstly, accord to the point of saturation magnetic flux and transformer core general single value curve equation to establish general nonlinear magnetization curve. Use the linear features of saturated magnetization curve segment to estimate the maximum inrush current and calculate the maximum depth of voltage sag. According to the magnetic flux decay time to estimate the duration of voltage sag. Simulate closing no-load transformer in a 10kV distribution network, and compare the simulated result with the calculated result. The results show that the proposed method is validity and accuracy.
Simulation of Partial Discharge Propagation Characteristics in XLPE Cables and Joints
Authors: Liu Bin , Yang Yu Qi , Chen Xi Ping , Sun Zhen Quan , Li Hong Jie
Published: February 2014

Accurate Partial discharge (PD) detection and location is of great significance for the power cable insulation condition monitoring. To achieve this, an adequate cable model to analyze pulse propagation is needed. Considering the complex structure of the cable, the equivalent circuit model is no longer applicable. In this paper a numerical electromagnetic method, FDTD, is applied. To analysis wave propagation characteristics in time domain, a well-established cable model is constructed. By simulating the electromagnetic (EM) field propagation inside the cable and the cable joint, the components of the electric fields excited by the PD source in different directions are calculated in order to evaluate the influence of the cable joint in practice, the calculated PD waveforms in the cable are compared with those of the cable joint model in FDTD.
The Design of High-Voltage Direct Current Power Supply for the Electrical Fast Transient Pulse/Burst Generator
Authors: Zhu Wu , Wu Shi Bing , Lu Hai Yu , Hong Xuan , Yu Juan Juan , Zhang Yuan
Published: February 2014

On the basis of introducing the working principle of the electrical fast transient pulse/burst generator, the method of combination of AC inverting and DC boosting is adopted to design a kind of DC high voltage power supply used for the electrical fast transient pulse/burst generator after the further study about the key technology of the high voltage DC power supply according to the requirements of IEC61000-4-4. The experiments show that the power output voltage reaches 5 KV, meanwhile the range of output voltage is from 0.1 KV to 5.0 KV within the linearity is about 5%, the electric power can be up to 250 watts. Above all, the design meets the requirements of the high voltage power supply for the electrical fast transient pulse/burst generator.
Design of a New Electric Energy Metering Cubicle System
Authors: Cheng Ying Ying , Yang Hua Xiao , Hou Xing Zhe , Xiao Ji , Du Jie
Published: February 2014

Based on the analysis of traditional electric energy metering cubicle, there are still a lot of disadvantages in operation. This paper presents a new type of electric energy metering cubicle. The composite intelligent terminal wiring device, intelligent locking device and image monitoring equipment are applied to the traditional standard electric energy metering cubicle. It is suggested that the new electric energy metering cubicle can effectively ensure the safety of the staff, prevent power loss caused by incorrect wiring and avoid electricity theft.
Analysis and Simulation System of Vehicle Dynamic Performance
Authors: Wang Zhen Bo , Lu Cui Ming , Huang Hai Zhu , Li Shu Zhi , Zhang Liang
Published: February 2014

It is difficult to measure the dynamic characteristic accurately. In the traditional simulation system, some parameters about dynamic characteristic usually are neglected. Aiming to the key problem, this paper presents a simulation calculation method to calculate the engine output power which considers the unstable condition of the actual running. According to the vehicle dynamic equation and actual running conditions of the vehicle, the mathematical model of dynamic characteristic is established. The vehicle dynamic simulation system is developed using the VC++6.0. Measurement experiment of dynamic characteristic of Hover H6 is performed. The experimental results agree well with the simulation results. This indicates that this method can accurately calculate the vehicle dynamic parameters and provide for scientific basis on the vehicle design.
High Precision Control System Design and Implementation of Outer-Rotor Permanent Magnet Motor with Dual Magnetic Sensors
Authors: Li Rong , Qiao Hai , Zhang Chi , Qu Wen Tai , Liao You Yong
Published: February 2014

The paper propose an outer-rotor permanent magnet synchronous motor (PMSM) with peak torque of 3000N.m. The position measuring system based on CPLD and dual magnetic sensor is developed. This system can handle two channel signals obtained from two sensor heads, and provides correct and reliable position feedback signals for the motor control. According to the mathematical model of the PMSM, full digital high precision control system with triple feedback closed loops are designed and implemented in experimental evaluation. The test results validate that the system is feasible and the control precision can reach 1.5 arc-second.
High Speed and Optically Isolated Communication Unit for System Sampling in Power Electronic Building Blocks
Authors: Zhang De Hua , Jin Xiao Guang , He Jiao
Published: February 2014

The reliability of Sampling and Transmitting Units (STU) are of great significance in power electronic systems. In order to reduce the sampling interruption, an FPGA-based and optic-isolated communication unit is proposed. The design philosophy and highlights of this method are described in detail. The sampled data is transmitted and received in digital mode in the STU. This unit realizes multi-channel sampling and supports simultaneous decoding of multiple fibers. It is pointed out that applications of this unit have practical value and excellent performance in isolation and transient properties in complicated power electronic systems. Waveforms and propagation delay between two nodes are presented by experimental result. The feasibility of the system design is shown through capacity calculations.
Simulation Study of System Operating Efficiency of EV Charging Stations with Different Power Supply Topologies
Authors: Huang Yu , Ye Jing Jing , Du Xin , Niu Li Yong
Published: February 2014

This paper discusses the effect of power supply and power conversion structure on system operating efficiency of an EV charging station. The system efficiencies of two EV charging stations (ECS), AC bus (ABECS) and DC bus (DBECS), are evaluated by a simulation analysis. The effect of power conversion structure is investigated by an analytical model constructed in MATLAB. Based on the battery characteristics, we build an energy loss model of various components of EV charging stations with different topologies including distribution transformer, power cable and charger with different conversion structure. Using this model, the system operation efficiencies of charging stations equipped with an AC or a DC supply bus are compared. The comparative results for both power supplies, acquired by the appropriate MATLAB/Simulink simulations, are presented.
The Experiments of Dual Kalman Filter in Lithium Battery SOC Estimation
Authors: Huang Jian Long , Wang Ying Nan , Wang Zhong Feng , Han Feng Li , Li Li Gang
Published: February 2014

We use Thevenin battery model and Kalman filter algorithm to online estimate lithium-ion battery pack state of charge (SOC) in this paper. In order to improve the accuracy of the model we use least square method and Dual Kalman filter (DEKF) algorithms to identify the parameters of model. The battery model can reflect the true state of internal battery well. The principle of Kalman filter algorithm is introduced. The relevant battery testing laboratory is designed. The algorithm has better accuracy when online estimate SOC and adapt to the environment well from experimental results. Finally, the convergence and robustness of DEKF algorithm are verified. It solves the problems that initial estimates are not accuracy and cumulative error.
Fractional Lumped Parameter Modeling of Transformer Windings under VFTO
Authors: Liang Gui Shu , Zhang Guang Bo , Liu Xin
Published: February 2014

Very fast transient overvoltage (VFTO) is very dangerous for the transformer which is directly connected to gas insulated substations (GIS). At the same time, due to the continuous increasing of operating frequency in the power system, under the high frequencies of the transmission line calculation and simulation process, it is necessary to consider the frequency-dependent properties of the parameter. In order to study the voltage distribution in transformer windings under VFTO, a new Lumped parameter model which takes into account the fractional characteristics is proposed, named fractional lumped parameter model (FLP). The model divides each turn of transformer windings into proper sections, whose parameters are all lumped parameters. Finally it shows the correctness and validity of the model through the comparation of the experiment datas and simulation results.
Research of the Key Technologies for Explosion-Proof and Intrinsically Safe High Voltage Frequency Converter
Authors: Lu Wen Tao , Li Yu Qing
Published: February 2014

Some key technical problems encountered in making mine-used explosion-proof and intrinsically safe high-voltage frequency converter are researched and discussed. The inverter integrates common-mode voltage rejection of DC reactor, deionized water circulation cooling technology, selective harmonic elimination technology, explosion-proof technology, adopts advanced Power Flex7000 with good speed regulation performance. The circulation water cooling device presented in this paper has high cooling efficiency, small size, lower operating noise and good water-saving effect. This inverter has actually run in Huainan coal mine and the application effect was better.
The Research of "Constant Current First, Constant Voltage After" Close-Loop Control Charging Tactics of High Frequency Charger
Authors: Zhang Xian Hui
Published: February 2014

This article takes non-on-board high frequency charger of pure electric vehicle for research subject, based on the overall structure design, aimed at the deficiency of constant current and constant voltage charging, put forward constant current first, constant voltage afterclose-loop control charging tactics, and analyses charging principle and process in deep, has a certain amount of theoretical research and practical application value.
Study of Supercapacitor Energy Storage Converter with Unbalanced and Nonlinear Loads
Authors: Li Ning Ning , Tang Xi Sheng , Zhang Guo Wei
Published: February 2014

A novel topology structure of supercapacitor energy storage converter (ESC) is presented with two cascaded bidirectional DC/DC converters connected to a bidirectional DC/AC converter. It can promote the energy utilization rate of supercapacitor and improve the ability of powering unbalanced and nonlinear loads. The effect of the midpoint voltage fluctuation of the cascaded connected DC bus capacitors on output voltage is analyzed, followed by the influence mechanism unbalanced and nonlinear loads. The control strategy to restrain the unbalance and zero sequence harmonic is proposed. The theoretical analysis and the proposed method are verified through simulations and experiments on a 100kVA supercapacitor ESC prototype.
The Speed Control System of AC Permanent Magnet Synchronous Servo Motor Based on Auto-Disturbance Rejection Controller
Authors: Yan Gang
Published: February 2014

According to the nonlinear dynamic mathematical model of the three-phase AC permanent magnet synchronous servo motor (AC-PMSM), the inner disturbance and outside disturbance can be observed with the extended state observe (ESO), and use it to offset the system. The result of simulation and experiment indicate the control system of PMSM has better dynamic and robust characters by using auto-disturbance rejection controller.
A Chaotic Carrier Frequency SVPWM Strategy to Reduce the Harmonic Distortion
Authors: Zheng Shi Sheng , Zhang Yong Jun , Zhang Yong Kang
Published: February 2014

Harmonics always have a negative impact on control precision and grid quality. It has been found out that harmonic distribution is very germane to carrier frequency. Based on the analysis of conventional SVPWM, in this paper a chaotic carrier frequency SVPWM strategy is proposed, where the theory of chaos is applied to generate the desired random source for SVPWM carrier frequency. Simulation result proves that chaotic carrier frequency SVPWM can not only improve the waveform quality, reduce the low-order harmonics, and also flatten the high-order harmonics effectively.
Integrated Design for Steering System and Suspension
Authors: Dong En Guo , Zhang Lei , Liang Li Xue
Published: February 2014

A design method of integrated control for suspension system and steering system is proposed based on vehicle ride comfort and handling stability. A car simulation model is built applying the software of MATLAB and ADAMS. The construction and characteristic of the integrated simulation model of the suspension system and steering system is illustrated in detail which uses fuzzy method and PID method. Using the simulation model, body vertical acceleration, roll angle and yaw angular velocity are measured in three status which include no control condition, the individually control for active suspension, and the integration control respectively. The simulation data show that the integrated control method synchronously ensures the ride comfort and handling stability.
A Cascading Failure Prediction Method in Power System Based on Multi-Agent and Hybrid Genetic Algorithm
Authors: Li Juan
Published: February 2014

To effectively predict cascading failure in power system, a cascading failure prediction method in power system based on multi-agent and hybrid genetic algorithm is constructed. A cascading failure prediction procedure in power system was established by multi-agent and hybrid genetic algorithm to investigate the emergent behaviors of cascading failures and to further study the prediction and defense of cascading failures. Finally, the cascading failure prediction simulation system of power system based on this method was demonstrated and validated by Flexsim software. The result showed that the proposed method was available, and can provided guidance for avoiding and predict cascading failure in power system, and support for stable performance in power system.
An In-Vehicle Monitoring System with OBD-Based Vehicle Terminal
Authors: Chen Wen Jie
Published: February 2014

An In-Vehicle Monitoring System (IVMS) monitors the location and status of the remote vehicle status. We developed an IVMS with OBD based Vehicle Terminal (VT) instead of traditional one, to reduce installing complexity and gain more useful data from OBD interface. This paper describes the architecture, discusses the different users and their related concerned features. This paper classifies the OBD-VT to 3 classes to fit for different requests. Finally, this paper discusses the development of OBD specification, with an expectation of standardization of more common functions, such as anti-theft features.
RETRACTED: Reliability and Cost Performance Ratio Analysis on EPON Protection Networking of Power Distribution Communication Network Access Layer
Authors: Gao Mei
Published: February 2014

Retracted article: Based on the reliability theory of power communication network, reliability analytic methods arc proposed for Ethernet passive optical network (EPON) protection networking of the power distribution communication access layer. By using the system availability theory, the reliability and cost of EPON protection networking arc quantitatively analyzed for the access layer of four kinds of power distribution communication network, i. c., tree-type network of single power supply redundancy protection, hand-in-hand network of whole chain protection, dual-power dual-T network of full link protection, and ring-type protection network. The optimal networking solutions arc discussed and summed up for the EPON protection networking schemes of power distribution communication network in current operation.
The Summary of Load Forecasting Method Based on Power Demand Side Management
Authors: Cao Jing Jin , Qin Li Jun
Published: February 2014

Weather, industrial structure and power demand side management can affect the load, however, the power demand side management has the most direct influence on the change of load. This paper first introduces the purpose of the electric power demand side management, then it introduces the relationship between the load forecasting and the power demand side management, furthermore it respectively introduces a variety of load forecasting method according to the time distribution, finally it compares the advantages and disadvantages of load forecasting methods for each time distribution respectively, and this will provide a new basis for power grid planning.
Modeling of Interlinked Air Suspension and Study on its Dynamic Performance
Authors: Li Zhong Xing , Cui Zhen , Li Mei
Published: February 2014

Interlinked air suspension, which formed by interconnecting two or more air springs of traditional air suspension using switchable pneumatic pipe connections, can further improve vehicles riding comfort and driving stability. The structure and working principle of this suspension is introduced, the model of interlinked air suspension is developed and validated via experiments. Simulation results indicate that, the larger the diameter of connecting pipe, the smaller the stiffness of air springs, and interlinked air suspension can effectively reduce vehicles roll angle and vertical vibration under its first natural frequency, which greatly affects vehicles riding comfort.
A New Short-Term Load Forecasting in Power Systems
Authors: Li Hui , Sun Hong Bin
Published: February 2014

For realizing highly accuracy load forecasting, a new method is proposed. Power load time series belongs to chaotic series. Firstly, for obtaining three parameters in chaotic theory, namely time delay, embedding dimension and the number of the nearest neighbors, self-correlation function method and G-P algorithm are used to reconstruct the phase space of chaotic time series. Secondly, ant colony optimization approach is introduced to more accurately acquire forecasting reference points, considering distance and relativity of phase points evolution in this paper. Finally, GM (1, 1) Model is applied to forecast daily load data. The actual forecasting results prove that the new approach has better forecasting accuracy and convergence.
Research on the Construction Method of Ontology Knowledge Base in Smart Grid Based on Dynamic Description Logic
Authors: Li Ting Shun , Meng Ling Na
Published: February 2014

With the principle of dynamic description logic, which introduces the concept of grid domain ontologys knowledge representation, a system is built that can be shared by each businesses ontology knowledge base in smart grid. First, combine attributive concept language with complements language using dynamic description logic with ALC language to build a smart grid domain ontology. And then use the ontology knowledge to build the final ontology knowledge base that can greatly improve the efficiency of information query and clearly express the basic concepts, properties, processing methods and internal relations of the smart grid domain knowledge, which is conducive to promote China's smart grid construction.
Micro-Power Wireless CSMA/CA Algorithm Improvement and Simulation Based on the Electric Power Business
Authors: Lan Yu , Lu Xin , He Ye Shen , Li Yun Feng
Published: February 2014

In the micro-power wireless transmission of the electric system, positions among modes are relatively fixed, power business data is reported at specific time points, and time distribution presents great differences. Key technologies of IEEE802.15.4 MAC layer protocol is expounded, shortages of collision detection and CSMA/CA on power business support, etc. are discussed, self-adaptive low-power consumption CSMA/CA algorithm which is more suitable for business of the electric system are designed and improved, and the algorithm goes through simulation experiment against the business characteristics of micro-power wireless network of the electric system. The simulation result demonstrates the algorithm may be greatly adapted to changes of network traffic under a relatively fixed environment of network topology on the premise of low power consumption.
An Optimal Scheduling for Wind Power Integrated Power Systems
Authors: Li Xing Yu , Zhao Dong Mei
Published: February 2014

Optimal Scheduling is an important issue in the power system including wind power, thermal power and hydro power. In this paper, a model is built to minimize the energy consumption and operating costs, considering the spinning reserve for wind power and operating characteristics of the units. During the peak load period, a hydro-thermal scheduling strategy is considered due to the peak shaving ability of hydraulic power plants. The solving process is based on the particle swarm optimization algorithm, and in the case study, a scheduling scheme is obtained for coordinated operation of wind power integrated power systems.
The Summary of Modeling Methods of Solar Panels
Authors: Ma You Jie , Ma Ling , Zhou Xue Song
Published: February 2014

In the situation that the traditional energy shortage and environmental pollution problems have become increasingly grim, the new energy research has been widespread concern at home and abroad. In recent years, due to dual pressures, environmental pollution and energy reduction, photovoltaic industry has a rapid development. As the solar panels convert light energy into electrical energy efficiency by light intensity and ambient temperature, therefore, the establishment of a common solar panel model to study the light intensity and ambient temperature on the output characteristics of the solar panels is necessary.
A Review of Application of Sensitivity in Power System
Authors: Zhou Xue Song , Shi Xue Qi , Ma You Jie
Published: February 2014

Sensitivity method is to get the level of sensitivity of dependent variable to independent variable by using differential relationship of some physical quantities in the system. It has been widely used in the analysis and control of power system. From the point of time, sensitiveness analysis method can be divided into two categories, static sensitivity and trajectory sensitivity. And according to the different considered variables, they are reviewed respectively in this paper. Application of sensitiveness analysis method in the power system reflects essential research value.
Energy Conservation Analysis for Air Conditioning System in Rail Transit Stations
Authors: Xu Bing , Yuan Fang Hong , Zheng Bao Guo , Shi Zhong Jin , Hu Yi Huan
Published: February 2014

This article discusses energy conservation for air conditioning systems in rail transit stations. At first, the paper analyzes the energy consumption condition in the air conditioning systems in rail transit stations. Then, it discusses application of appropriate control strategy for reducing energy consumption. In the end, the paper calculates effiency and amount of the energy saving based on the control strategy.
Buckling Analysis of Large-Scale Transmission Tower Structure
Authors: Xie Xiang Zan , Zhang Rui Jun
Published: February 2014

The high-voltage transmission tower transmission lines is a major component and typically a high steel tower, is a tall, flexible structures. In this paper, the finite element method to establish a large-scale three-dimensional model of the transmission tower space, computational analysis of the transmission tower structure first six buckling modes and critical load, examined the order buckling mode characteristics. Research on the structural stability of large power transmission tower design has some theoretical significance and application value.
Research on Developed Control of SRG for Wind Power Application
Authors: Huang Zhao , Zheng Xiao Yu , Wan Jun Li , Cheng Jiang Zhou
Published: February 2014

Actual characteristics of Switched Reluctance Generator (SRG) are simply introduced. Control strategy of developed output voltage optimization and maximum power point tracking (MPPT) method are proposed and the applications are analyzed in detail. Simulation results show that the voltage optimization can be realized with developed regulation system on the basis of fuzzy logic scheme, while MPPT also can be perfectly performed by feedback information of SRG rotational speed as well as its change direction signal; finally excellent electrical energy quality can be sent out, and favorable conversion efficiency can be maintained during different working environments.
μ-Synthesis Control of Photovoltaic System
Authors: Yin Zi Heng , Li Peng
Published: February 2014

Traditional control methods are usually difficult to achieve a good compromise between nominal performance and robust performance, in order to improve the flexibility and robustness of the PV power grid-connection system without affecting its nominal performance, aiming at the effect on flexible PV power grid-connection by component parameter perturbation, a μ-synthesis robust control method of flexible grid-connection of photovoltaic power based on model matching is proposed. Model matching problem including the actual controlled objects like inverters, is transformed into a generalized system with uncertainty block being abstracted, thus further is attributed to a structured uncertainty problem, which can be solved by DK iteration. The μ-analysis and simulation results show that the designed μ-synthesis controller, makes the robust performance of the closed-loop system satisfied, and advantages are especially more obvious in the case of system component parameter perturbation.
Research of Pure Tone Detection for Faulted On-Vehicle Loudspeakers Based on Image Fractal
Authors: Tan Gui Ling , Qi Yu Ming , Deng San Peng , Miao De Hua , Gao Wen Hua
Published: February 2014

At present, the detection accuracy of monitoring method by human ears is not satisfying in the pure tone detection of on-vehicle loudspeakers. To solve this problem, a new method is proposed to convert vehicle loudspeakers response signals into a two-dimensional image signal via wavelet packet analysis, which can increase the time-frequency of malfunction information. Through image binaryzation and pretreatment image-edge detection, the resulting signal would be recognized with box-counting dimension acquired in the process of gaining time-frequency image through fractal dimension as malfunctioned indications. Experiments show a rate of fault recognition as high as 95% , which meet the requirements of online vehicle loudspeaker detection.
Review on Method of Maximum Power Point Tracking in Photovoltaic Generation System
Authors: Xu Dan , Li Qi Yu , Chen Hui , Cao Bing Gang
Published: February 2014

This article summarizes the methods of Maximum Power Point Tracking (MPPT),including the CVT, P&O, INC and intelligent control, and merits and demerits are narrated in detail. Their recent research results are analyzed, finally the prospect of the development trend in MPPT photovoltaic power generation system is discussed.
A Feasibility Urban Power Network Black-Start Scheme Based on Gas-Steam CCPP
Authors: Liu Tao
Published: February 2014

This paper designs and discusses black-start scheme based on a gas-steam combined cycle power plant (CCPP) in Tianjin power grid of China. First, considering the structure characteristics and station service power connection mode of the gas-steam unit, the diesel generator is chosen as fast self-starting unit. Also two self-starting schemes of direct starting and variable frequency starting are designed. Second, the technical feasibility of two schemes is determined through first loading capability test and bus voltage level test. After investment estimation comparison, the scheme II is chosen as recommended scheme. The research process proposed in this paper has certain reference significance to power grid black-start.
Self-Organizing Feature Extraction Method for the High-Voltage Discharge Fault in Ultraviolet Imaging Detection System
Authors: Wang Wei , Ma Li Xin , Huang Da Hai
Published: February 2014

An ultraviolet detecting system for electrical faults is designed and built to locate the fault precisely and classify its pattern level as few studies have been done on. Self-organizing feature extraction method devotes itself to fault state recognition approach in high-voltage discharge. The established system including the filter system, image collection system, image preprocessing system, feature extraction, and pattern recognition could identify and classify device faults and operation conditions accurately tested by simulation.
Online Method for Location of Single Phase to Ground Fault through Cement Pole in Distribution Network
Authors: Yang Hong Yu
Published: February 2014

In China,most of distribution system is neutral noneffectively grounded. And the single-phase fault often happens through cement pole. In this paper,firstly,the voltage of the fault phase and the current of cement pole are derived in 10kV neutral noneffectively grounded distribution systems when cement pole has single-phase ground fault.Secondly,the online fault location method is proposed based on voltage gradient of cement pole.Thirdly,the resistence characristic of cement pole is analyzed and the distance obtained from the gradient voltage of cement pole is given.Finally, the theoretical analysis and simulation experiments show that the method is feasible.
Study on the User-Side Risk of Smart Grid System in Big Data Age
Authors: Wang Jing Min , Wufuer Maimaitiaili , Guo Xiao Fan
Published: February 2014

With the coming of big data age, Internet, finance and other industries have launched in-depth studies on big data technology. They hope to grasp the opportunities that big data brings to enterprises. Smart gird construction generated massive and heterogeneous data in the process of electricity generation, electricity transmission and electricity consumption, thus electricity big data took shape. Based on the analysis of Big Data characteristics of Smart gird user-side, this paper describes the risks that big data reduces on smart gird user-side from the perspectives of demand forecasting, customer complaint and operation risk that grid peak valley load brings. Meanwhile, it also expounds the risks that big data brings to Smart gird user-side from the perspectives of technology and user information security. Hope to provide some relevant materials of the Smart gird user-side risk management for our country.
Study on Technological Evaluation Modeling of Smart Grid
Authors: Hu Dian Gang , Zheng Jie , Zhang Yu Hong , Xu Hao Liang , Zhou Hai Ming , Yang Jian Kang , Pu Tian Jiao
Published: February 2014

The Smart Grid is the development trend of grid technology. For guiding the construction of smart grid scientifically, quantitative evaluation for the level of technology maturity of the Smart Grid construction is necessary. The evaluation results can be used for determining the stage of the current construction of Smart Grid and summarizing the problems which came up during the process of construction, also finding the gap between current satiation and individual goals to determine the direction and key job in next step. This paper take the characteristics and goals of domestic Smart Grid into account, build a maturity evaluation model which assess the smart grid maturity in three dimensionstime, production processes and technical features separately. By setting the primary and secondary parameter the model can be used for smart grid assessment in any time, scenes and region. The model make a comprehensive coverage of various aspects in the smart grid construction process and the results of evaluation can be analyzed from different dimension to find the short slab to guide the work in next step.
Research on Hydraulic Response Characteristics of Inlet Valve Used in Hydraulic Braking System
Authors: Wang Yan Bo , Chu Liang , Ma Wen Tao , Cai Jian Wei , Bai Guo Jun
Published: February 2014

Hydraulic modulator regulates the pressure of four wheels independently to realize the Anti-lock Braking System (ABS) and the Electronic Stability Control (ESC) function. The pressure regulator, also called hydraulic control unit, works by controlling several valves to realize the on-off operation of the liquid paths. This paper focuses on working mechanism and hydraulic response characteristics of inlet valve of hydraulic control unit through simulation analysis.