bluuebunny/crossref_metadata_2025 huggingface dataset:
Stress State Analysis on a Rock Anchor RC Foundation of Wind Driven Generator
Authors: Yan Shi , Song Bi Cheng , Sun Wei , Yan Han , Yu Qi Le
Published: October 2013

The stress state of a rock anchor reinforced concrete (RC) foundation of a wind driven generator located in the new constructed wind power station in Guodian Tieling Development Zone of China is numerically analyzed in this paper by using the large general-purpose finite element analysis (FEA) software ABAQUS, to discuss the mechanical characteristics of the rock anchor RC foundation, and validate the safety of normal use of the rock anchor foundation, and compare the developed rock anchor foundation with the traditional gravity one. The results show that the new-type RC foundation has greater advantage than the traditional one and it can completely replace the traditional gravity foundation in the condition of rock soil environment in the future.
Performance and Failure Pattern on Enlarged Bottom Anchor Bolt under Pullout Loading
Authors: Yan Shi , Yu Qi Le , Du Hai Tao , Song Bi Cheng , Yan Han
Published: October 2013

The pullout test of an anchor bolt is very important for the anchorage technology. Adopting enlarged bottom anchor bolts to wind turbine foundations can not only take advantage of the mechanical property of rock mass, but also have good security and economical efficiency. The finite element analysis software ANSYS is used in this paper to numerically analyze a single enlarged bottom anchor bolt under pullout loading, to research the performance and failure pattern of the anchor bolt. The anchor bolt side friction is extracted to understand the stress distribution of the bolt. By the analysis of the bearing capacity of anchor's enlarged head and the change of plastic zone form, the ultimate strength and destruction form of the anchor blot are clearly understood. The results also show that the bearing capacity of the proposed enlarged bottom anchor bolt can obviously increased, resulting in a cone-shape failure pattern of soil.
A Control Strategy to Mitigate the Fluctuation of Wind Power with Ultra-Capacitor
Authors: Li Guo Qing , Ren Xiang Zhen , Chen Hou He
Published: October 2013

Energy storage technology plays an important part in wind power generation system integrated with energy storage device. This paper researches on the control strategy of smoothing the output curve of wind power. Take advantage of high power density ultra-capacitor to achieve this objective according to a basic principle that the desired wind power approaches the average value of wind output in the previous period. Meanwhile in order to make the dispatch more flexible, SoC level of ultra-capacitor and fluctuation of wind power are considered to optimize the time constant in real time. The wind power generation system integrated with energy storage device is simulated in the PSCAD/EMTDC software. The simulation results demonstrate the efficacy of proposed control strategy.
Research on D-PMSG Wind Power System with SDBR for LVRT
Authors: He Xiong Feng , Li Xian Yun , Ji Tong Zhou , Peng Hao , Liu Kun
Published: October 2013

For enhancing low voltage ride though (LVRT) capability, this paper proposes a new protection scheme of series dynamic breaking resistor (SDBR) connected to the grid-side inverter (GSI) of directly driven permanent magnet synchronous generator (D-PMSG) wind power system, which has a lot of advantages such as possessing low cost, simple structure and high reliability. The structure, switching control strategy and matched resistance of SDBR are researched. The proposed scheme was then applied to uplift GSI voltage during a fault, maintain active power delivered to grid, inhibit DC-link overvoltage and GSI overcurrent. The simulation analysis shows that the SDBR can substantially improve the LVRT capacity of D-PMSG wind power system in PSCAD/EMTDC.
Control of Vector Transformation in the BDFG Distributed Wind Power System
Authors: Li Hua , Wu Zhen Kui , Zhang Ji Hong , Li Han Shan
Published: October 2013

The characteristic of maximum power tracking was required in brushless doubly-fed generator (BDFG) distributed wind power system. This paper analyzed the mathematical model on synchronous coordinates of BDFG, and a vector transformation control strategy is put forward based on flux linkage oriented of the stator technology. It also established the vector transformation and the BDFG model in the Matlab/Simulink, and conducted the maximal wind energy capturing simulation research for the distributed wind power system with this algorithm. The theory analysis and simulation results indicated that this proposed control is feasibility and superiority in this field.
Control Strategy of Full Power Converter for Wind Turbine under Grid Voltage Swell
Authors: Lin Zi Xu , Xu Hong Hua , Jian Wang
Published: October 2013

LVRT technology is currently a hot research of wind power, but the impact on the wind turbine of grid voltage swells and HVRT technology have not been given sufficient attention. This article analyzed the converter problems of full power wind turbine on grid voltage swells and used the control strategy of reactive power control, dynamic voltage and over-modulation to enhance the full power wind turbines HVRT capability.
Analysis on Power Output Capability and its Power Control Strategy of DFIG Wind Turbine under Unbalanced Grid Voltage
Authors: Hu Shu Ju , Wang Ling Ling , Deng Ya
Published: October 2013

Wind turbines are required by gird codes that active and reactive power should be fed into power grid during gird faults such as voltage sags. Power output capability is important for DFIG wind turbine to provide active and reactive power support. Constraints of stator, rotor maximum current and maximum output voltage of rotor-side converter (RSC) of DFIG are considered to analyze stator power output limit of the DFIG under unbalanced voltage sags, and newton-raphson method is used to solve the power limits, then the power control strategy based on power limit analysis is proposed. Simulation, calculation and comparison are carried out by a 1.5MW DFIG wind turbine model, and the effectiveness of the analysis and the proposed control strategy is verified.
Evaluation of the Technical Potential of Wind Heating in Facilitating Wind Power Integration in China
Authors: Wang Cai Xia , Li Qiong Hui
Published: October 2013

Utilization of the otherwise curtailed wind to produce heat is considered an effective solution to combating wind curtailment. This paper studies the technical potential of wind heating in facilitating wind power integration in China. Technical schemes of wind-heating are proposed and their potential of facilitating wind power integration is studied both theoretically with probability methods, and quantitatively with case examples. The prospects of promoting wind-heating in China are also discussed. Results show that wind heating does help to facilitate wind power integration, but with limited roles. Other measures are still needed to thoroughly solve the wind integration issue. Analysis of wind-heating in wind rich areas such as Inner Mongolia, Liaoning, Jilin and Heilongjiang shows that it help enhance wind integration by 35%-45%.
Individual Pitch Control for Load Reduction Based on Norm Theory
Authors: Deng Ying , Zhang Dan , Zhou Feng , Tian De
Published: October 2013

As the capacity of wind turbine increases, unsteady blade loads and performance caused by asymmetrical effects like turbulence, wind shear and tower shadow lead to fatigue loads which seriously affect wind turbine life cycle. This paper focused on wind turbine fatigue load response characteristics, built the multiple input multiple output linearized matrix model, introduced individual pitch control algorithm for optimized disturbance control based on norm theory. Modeling, simulation and verification of the control algorithm are conducted in Matlab. The investigation is conducted based on a 2MW doubly-fed wind turbine. By comparing the results of wind turbine deflection rate and angle deflection rate to collective pitch control method, it shows the individual pitch control algorithm can significantly reduce wind turbine fatigue load, and the control effect is superior to traditional control algorithm.
Life Cycle Assessment on Environmental Impact of Wind Power Turbines
Authors: Dong Jia Hua , Zhu Wei Guang , Gao Cheng Kang
Published: October 2013

Wind power is an important type of renewable energy sources. In this passage we will apply Life Cycle Assessment (LCA) to analyze the four stages of wind power generation,which are production of raw materials, transportation, build-operate process of wind plants and demolition stages, calculate the energy consumption and the environmental impact, set a contrastive analysis between coal-fired power plants and wind power plants. We will take WangHaiSi Wind Plant in Faku, Shenyang as an example to show the difference between the two ways of getting power. The analysis shows that: in comparison with coal-fired generation, wind power generation saves more energy and reduces emissions of pollutants markedly; the main energy consumption comes from production of raw materials, which takes 79.3% of the total energy consumption throughout the life cycle. In the meantime, the large amount of ecological resources consumption from construction, operation and maintenance of wind plants leads to mass emission of carbon dioxide and sulfur dioxide, which respectively take 67.3% and 96.6% of total emissions. Besides, wind generation only accounts for 0.93%, 0.89% and 2.72% of energy consumption, global warming potential (GWP) and acid potential (AP) of coal-fired power generation. Thus, it proved that wind power generation has lesser impacts on environment than coal-fired power generation. However, it is still of great necessity to strengthen the environmental protection measures to reduce the consumption and destroy of ecologic resources.
Nodal Expansion and its Application in AP1000 Nuclear Reactor Core Monitoring System
Authors: Jia Wei Zhi , Wang Rui , Zhou Yun
Published: October 2013

As the core monitoring system of AP1000, BEACON always uses a full-core nodal model for core monitoring based on the ANC-NEM nodal model. The theory behind the nodal expansion method is discussed, and the application of the method in BEACON is described. Finally, an ANC-NEM calculation simulation is proposed.
Reassigned Time Frequency Analysis for PD Signals in GIS
Authors: Wang Hui , Li Xiu Wei , Yun Yu Xin , Yuan Hai Yan
Published: October 2013

Partial discharge signal in GIS is a kind of typical non-stationary signal, using the time or frequency domain simply is not enough to describe the time-varying information of PD. Based on the reason above, this paper introduces a joint time-frequency analysis method according to the reassignment theory for analyzing the PD of GIS. After the processing of the PD signals simulated and on field, we conclude that this method provides a higher concentration in the time-frequency plane and reduces the most influence of the cross-interference terms.
Numerical Simulation for DC PD in Void
Authors: Li Jin Zhong , Zhang Shu Qi , Guo Rui , Tang Hao , Zhao Tao , Liu Yun Peng
Published: October 2013

A numerical simulation for DC PD in void is put forward based on the PD physical process. The finite difference method is used to calculate the electric field distribution, and both of the stochastic property and the accumulation of the charge after PD on the void surfaces are considering in the model. The time of PD occurring, the amount of discharge and the voltage across the void are calculated. Meanwhile, the relationship between the DC voltage and the PD time interval or repetition rate is also simulation, the results show that with the increase of the DC voltage, the PD interval corresponding decreases exponentially and the repetition rate increases exponentially.
Application and Improvement of a High Voltage Switchgear Partial Discharge Detecting and Positioning Technology
Authors: Jin Fang Yuan , Kong Ling Ming , Li Jue Long , Liu Zong Jie , Ye Hai Feng , Jiang Xiu Chen
Published: October 2013

A new partial discharge online detecting equipment based on TEV method is introduced in this paper. Its application to 3~35kV metal-enclosed switchgear partial discharge detection is clarified by an instance. Advice for improvement is also presented.
100 Millimeters Sphere-Gap with Non Uniform Field Electrodes Triggered Gaps
Authors: Suksamosorn Chaichana , Tonmitra Kittipong , Suksri Amnart
Published: October 2013

A common field distortion triggered spark gap utilizing geometric field enhancement at sharp edges usury operates in a cascade mode via the trigger electrode. A new trigger concept is propos this research allowing strong non-uniform electric field enhancement with output precision voltage by holding-off DC voltage ranging from 1 to 135 kV and direct breakdown between the two main electrodes. A test setup was designed to testing with four modes of operation as mode A, B, C and D to prove the feasibility on this concept. Were result experimental r the recommended mode of operation is mode A and mode D considered to be unsatisfied to most applications. The best results achieved by using the triggering with mode A at a wide precision designed breakdown voltage range 1-120kV with a minimum percentage ratio of Fire/Self-fire Voltage lower to 36-47%
Application of Mathematical Principles in Calculating Method of the Conductivity
Authors: Li Guan Min
Published: October 2013

Polymer electrolyte organic polymer as the main matrix, poor mechanical properties, in addition, the ion transfer is mainly in the amorphous regions completed and the polymer electrolyte composite polymer generally has a strong ability to crystallize, thus greatly suppressed ion transmission. People try by the incorporation of different types and contents of the filler to improve the mechanical properties of the polymer electrolyte, lower crystallinity and increase the ionic conductivity. Various inorganic nanoparticles are the most common type of doping filler.
Study on Low-Power Intelligent Switching Power Supply
Authors: Wang Zhong Xian , Wei Yong Geng , Wang Hai Feng
Published: October 2013

New switching power supply gradually replaced the traditional linear power supply, but rarely has the operational status monitoring function. The design includes the main power supply and monitoring circuit design. The main circuit topology of the power supply is flyback DC-DC conversion body. The selection of the control circuit is current-controlled PWM chip. The monitoring circuit includes the design of detection and display circuit. The voltage and the current are detected respectively with the aid of the resistive subdivision in the testing circuit. The display circuit adopts PIC for sampling signal processing, and the dot matrix LCD12864 is used to display this power operating parameters. The power supply control system is simulated in Saber and Proteus software which monitors and observes the various parts of the circuit voltage and the output waveform. Finally, the hardware circuit is built and tested to prove the designed digital intelligent power feasibility.
Highway Illumination Project Design Discussion
Authors: Ding Wei Zhi , Jia Xu
Published: October 2013

In recent years, with the rapid development of transportation industry, lighting installations were installed in the toll station and some important highway with dense traffic. Illumination plays an important role in the highway. This paper first introduced the illumination, lamps and lanterns, light source selection. Then the lighting power supply system was analyzed.
A Novel Design for the Stackable Piezoelectric Power Generation Devices Conjunction with the Microelectric Energy Saving System
Authors: Wang Ching Wu , Yeh Ti Chun , Lin Po Kai , Hsu Ming Han , Lin Kai Chun , Chen Chien Hua , Wang Wei Chih
Published: October 2013

An optimal design for the stackable four-layered piezoelectric power generation device and its microelectric energy saving method is presented here. In this work, three different device arrangements for the piezoelectric four-layered power generation devices were firstly deposited and compared for obtaining a greater output power. Measurement results demonstrated that Sample 2 among the three different device arrangements could not only avoid the damage to PZT-5H piezoelectric materials but also achieve a grater instantaneous output power (5.359mW). Subsequently, a novel microelectric energy saving system by constructing a less power dissipation boost converter IC with its proper surrounding circuit was also exhibited. Evidence showed that among the three different IC modules, Case 1 performs an optimal microelectric energy saving system since it could effectively fully charge a 30 mAh Zn-MnO2battery within the shortest time duration (4 hours).
Harmonic Analysis and Simulation of Medium Frequency Furnace
Authors: Li Tian Ran , Ying Liang , Sun Lin
Published: October 2013

Basic structure and operational principle of medium frequency furnace (MFF) are introduced in this paper. The characteristics of harmonic currents produced by MFF are analyzed theoretically. A harmonic analysis simulation model for MFF with 12-pulse reciter based on Matlab/Simulink is presented. The validity of it is proved for the simulation harmonic currents accord to the theoretical anticipation. This model could be used to predict the harmonic of MFF not in operation. Based on this model, potential harmonic pollution of a new steel plant is studied by simulation with Matlab/ Simulink.
Grey Correlation Analysis of China's Electricity Imports and its Influence Factors
Authors: Zhang Hong Jing , Wang Feng , Tian Zhen Kun
Published: October 2013

China's electricity imports and its influence factors of ten years were analyzed. On this basis, the electricity imports and the influence factors of grey correlation were calculated by using grey correlation analysis method. It makes a conclusion that every influence factors effect on electricity imports, and establishes a grey model GM (1, n) of electricity imports as well as its influence factors and determines the quantitative relationship between the selected influence factors and electricity imported. The model has high accuracy, and meets the practical requirements, so that it makes a better load forecasting for our country and provides a theoretical basis for taking some electricity import measures.
Research on the Control Method of STATCOM Based on MMC
Authors: Li Kai , Zheng Yi Hui , Wang Xin , Li Li Xue , Yao Gang , Zhang Yang
Published: October 2013

To realize the STATCOM based on Modular Multilevel Converter (MMC), a simplified double-closed loop structure, simplifying from the control method of High Voltage Direct Current (HVDC) based on MMC, is presented. Considering MMCs DC side using capacitors, a part-controlling method based on energy balancing is proposed, to solve the voltage balancing problem. With the part-controlling fixing the changing capacitors voltage and the simplified double-closed loop control method, voltage fluctuation could be reduced, and the loads reactive power could be compensated. The correctness and the effectiveness of the MMC-STATCOM controlling scheme is verified by Matlab/Simulink.
Research of Dynamic Voltage Restorer Base on the Model-Free Adaptive Control
Authors: Zhou Xi Chao , Wang Wei Zhou , Liu Jun , Liu Fu Chao
Published: October 2013

A new control method, a model-free adaptive control,is used to resolve the steady-state error , insensitivity to the disturbance of power system, adaptive load is bad which is existed in feedforward control method of traditional, it only use the the data of load voltage and input voltage to determine the controller parameters, no need to establish the mathematical model of the system, Only by adjusting the parameters of a line, to achieve interference suppression system, the purpose of load voltage stability base on the theory analysis made emulation research and made the compare with the traditional feedforward control method . The Simulation results make clear that the correctness and feasibility of the method.
Low Voltage Ride through of Wind Turbine Based on New SGSC Converter Structure
Authors: Dong He Nan , Song Yun Dong , Wang Gang , Xing Zuo Xia
Published: October 2013

The proportion of wind power in power systems is increasing year by year. Large-scale wind turbine off the grid when grid system failures. So the wind turbine needs to low voltage ride through (LVRT) function of wind turbine. Aiming at this problem, which in this article by DIgSILENT simulation software build 1.5MW doubly-fed wind turbine(DFIG) model, using active Crowbar and series grid side converter (SGSC) control strategy to realize the simulation of low voltage ride through of wind turbine. The control strategy of active Crowbar is mainly through the short circuit of rotor side converter to realize LVRT, and needs to be matched with the active and reactive power control strategy. SGSC is a novel converter structure, which mainly through compensating stator flux drop to realize LVRT. Finally this two kinds of control strategies were compared, demonstrated SGSC control strategy can achieve the low voltage ride through capabilities of the doubly-fed wind turbine.
A Novel Multi-Functional Grid-Connected Inverter of Renewable Energy Resources
Authors: Zhou Lei , Liu Hong Da , Chen Ming Jie , Shen Nai Jun
Published: October 2013

On the basis of analyzing the synthesis application of p-q (instantaneous reactive power) theory and unit vector template, a multi-functional grid-connected inverter (MFGCI) with auxiliary services on power quality enhancement in micro-grid (MG) is presented. The novel control strategy for achieving maximum benefits from these MFGCI when installed in AC MG access to 3-phase 4-wire distribution systems by isolated transformer at the point of common coupling (PCC). This kind of inverter can not only deliver the power generation of renewable energy sources (RESs), but also can perform as active power filter (APF) at their PCC as well as can improve the efficiency of inverter and decrease the hardware investment. Finally, both feasibility and effectiveness of this new topologies and control strategies of MFGCI are verified by PSCAD/EMTDC.
Research of Bipolar Micro-Arc Oxidation Pulse Power
Authors: Liu Hong Yang , Chen Ji Kai , Li Wei , Wang Ji Yuan
Published: October 2013

the micro-arc oxidation technology is introduced in this paper firstly. The main circuit is designed according to the design demand. The main circuit is made up by chopper circuit and inverter circuit, the chopper circuit regulates the output voltage. Then the control circuit is designed, the control circuit include the key circuit, A/D converter circuit, driver circuit and LED display circuit.
A New more Stable Droop Control Strategy in the Islanded Microgrid
Authors: Chen Xiao Qi , Jia Hong Jie
Published: October 2013

The droop control is commonly used as the control strategy in microgrid. The traditional droop control only considers the relation between the active power and voltage frequency; and the relation between the reactive power and voltage amplitude.This study proposes the improved droop control ; which considers the active and reactive power are simulatedly related with both the voltage amplitude and the voltage frequency. This improved droop control not only could satisfy the load sharing in according to the capability of the distributed generations; but also represents better stability than the conditional droop control.The simulation in MATLAB/simuliink validate the effectiveness of the proposed control strategy
A Research on the Impact of Photovoltaic Power Network-Connected on Power Loss of Distribution Network
Authors: Zhao Yi , Liu Li , Sun Wen Yao , Zou Quan Ping
Published: October 2013

Smart Grid framework to achieve clean energy friendly access, to achieve energy conservation and reduction of environmental pollution, is to build the smart grid hallmark. Photovoltaic power plants grid, although to bring some impact on the grid, but also a certain role in promoting on the line loss rate decreased. This ignores the impact of other factors, only from the perspective satisfy voltage constraints, analyzing PV power plant different grid location and grid capacity for line loss rate.
A Novel Algorithm of Energy Savings for Transformer Renovation and Replacement Project
Authors: Yan Hua Guang , Jiang Li Min , Yang Xiao Bin , Jiang Zhe
Published: October 2013

At present, smart grid is developing in China, in order to reach a safe and economical power system. In the process of establishment of smart grid, transformers which are dissatisfied with the demand of increasing load must be renovated or replaced. Economic costs and loss reduction and energy saving should be taken into account when choose a transformer. According to existing algorithms, a novel algorithm for energy savings of transformer after the original transformer is renovated or replaced. Combined with one practical project, the effectiveness and accuracy of this algorithm have been verified.
Risk Assessment of Power Transformer Based on FTA, FAHP and GA
Authors: Sun Yi Yun , Wang Xin , Zheng Yi Hui , Li Li Xue , Zhou Li Dan , Xu Qing Shan
Published: October 2013

The reliability of power transformer is very important to the safe operation of the power system. So a new method for power transformer risk assessment based on FTA, FAHP and GA is proposed. The method firstly establishes the power transformer fault tree; Secondly, it analyzes the fault tree through Fuzzy Analytic Hierarchy Process and constructs the fuzzy judgment matrix on transformer fault factors; Finally, it changes the question of solving the weight coefficients of each factor into a mathematical programming problem, and uses Genetic Algorithms to get the result so as to obtain the transformer reliability. In addition, the application result shows the effectiveness of the method above.
Application Research Progress of the Microbial Sensor
Authors: Liu Jie , Zhu Jian , Wang Ping , Sun Xiao Qing , Yang Hui , Chen Wan Ying
Published: October 2013

A brief introduction on the forms,working principle and sorts of microbial sensors is given,the application of microbial sensors in the field of biological industry,environmental monitoring and clinical medicine are summarized.The prospects of bioensors are also prognosticated.
The Establishment of Evaluation Index System for the Secondary Equipment of Power System
Authors: Ren Huan , Xu Yan
Published: October 2013

The stable operation of the secondary equipment is very important to the stable operation of power system. In order to improve the operation reliability of the secondary equipment and reduce personnel maintenance workload, the condition-based maintenance of secondary equipment is urgently needed. According to the field data, this paper established a set of evaluation index system, the system can accurately evaluate the secondary equipment status.
Discussion on Construction Mode of Distributed and Autonomous Region-County Integration Dispatching Automation System
Authors: Zhao Jia Qing , Zhuang Wei Jin , Sun Ming Yang , Zhang Yong Gang
Published: October 2013

To solve problems like slow computing speed and system operation speed, low system stability and reliability, which were encountered at implementing traditional region-county integration dispatching automation system (DAS) in a large scale region-county dispatching system, this paper provides a new type construction mode of region-county integration system, i.e. distributed and autonomous disaster tolerance backup system. It redesigns the structure of region-county integration system from aspects of network structure, model integration, data integration, application integration, separated operation and remote backup, provides wide area remote interconnection of region DAS with county DAS distributed at each county to make them become one logical set of system and realize share of data, technologies and equipment sources, save cost of system maintenance and construction, improve the reliability of DAS, realize remote disaster tolerance and backup and improve region-county operators' professional ability and technological level.
Environmental Fate, Analysis Method and Treatment Technology of Bisphenol A: A Review
Authors: Yang Bo Wen , Zhang Jun
Published: October 2013

As one of major environmental endocrine disruptors (EEDs), bisphenol A (BPA) has been drawn increasingly lots of people in the world, which is also widely identified as an indispensable raw chemical in plastics production, food cans and dental composites. With increasing demand and production capacity of BPA, moreBPAwill enter into and contaminate the environment. So it has become a challenge that excess BPA jeopardizes the health of human being. Considering a pretty low dose of BPA existing in the environment, some advanced analysis techniques have been carried out to analysis BPA, such as HLPC, GC-MS, LC-MS. Compared with other physical and chemical treatment technology, biological treatment technology has the advantage of low cost and high efficiency.
Multistage Transmission Network Planning Based on Ecology Evolutionary Algorithm of Food Chain
Authors: Li Xiang Shuo , Yan Hai Ou , Kang Shao Hua , Wang Kun , Zhan Zhu , Zhao Quan Sheng , Jia Yuan , Bin Liu , Gao Feng
Published: October 2013

Applying ecology evolutionary algorithm of food chain which simulates biological energy transfer mode to multistage transmission network planning (MTNP). According to the characteristics of MTNP, a real number encoding method is proposed to solve the problem that decision variables dimension increases as the stage increases. The test is performed on a 19-bus system and demonstrates the method EEAFC-based MTNP is practical and effective.
Study on System Reliability Allocation Based on Adaptive Agent Simulation
Authors: Shen Ying , Cao Jun Hai , Shan Zhi Wei , Liu Fu Sheng
Published: October 2013

In the given mission environment, the reliability models of materiel system are mixed and made up of series, paralleling and by-pass, and usually dynamic in the mission profile with multi-task phases, with some uncertainty. The method must be combined with Conception Comprehensive Evaluating Model, Conception Optimizing and Improving Method, and formats closed loop process of conception optimization. The method applies to either basic reliability allocation or mission reliability allocation, considers the change of system environment to the effect on mission, and determines system reliability allocation conception oriented on mission, with relative optimization and better application.
Mathematical Description of Interaction of the Elements in the Power Network System
Authors: Dubyago Marina N.
Published: October 2013

Research of stability of the power systems (PS) assumes the analysis of stability static or dynamic both generators, and engines. This article represents creations of the PS mathematical model is considered as sequence of two stages: creation of models of separate elements; creation of model of their interaction. The mathematical description of a site of distributive system on the example of the synchronous generator.
Research on Ferro-Resonance of Electromagnetic Voltage Transformer
Authors: Liu Min , Yun Yu Xin , Yuan Hai Yan
Published: October 2013

Ferro-resonance due to the voltage transformer (PT) occurs is a normal fault of power systems. With the nonlinear excitation characteristics of PT, its saturation is considered to cause the Ferro-resonance. Based on the ATP-EMTP platform, and considering the nonlinear excitation characteristics of PT, this paper builds a ferro-resonance simulation model of PT, and simulates high frequency resonance, fundamental resonance, and fraction frequency resonance separately. The factors affecting resonance are also discussed, to provide theoretical basis for the suppression of ferro-resonance in power system.
Transient Component-Based Distribution Network Single-Phase Ground Fault Location
Authors: Wang Zeng Ping , Liu Jia , Luo Wei Hua
Published: October 2013

The paper study the single-phase ground Fault Location. Which analysis neutral non-effectively grounded distribution network transient characteristics of single-phase. and verify the HHT method accuracy that through the actual system simulation of single-phase ground fault experiments .It proposed the fault localization criterion which is based on parameter identification. current single-phase ground fault detection and section targeting methods. The paper proposed the implementation which fault information is incomplete. It is help for theoretical study and power engineering..
Oil-Filled Power Transformers Fault Diagnosis Based on Fuzzy-DRNN
Authors: Fan Ying Ping , Duan Hui Da
Published: October 2013

In recent years, improved three-ratio is an effective method for transformer fault diagnosis based on Dissolved Gas Analysis (DGA). In this paper, a simple dynamic neural network named as diagonal recurrent neural network (DRNN) is used to resolve the online fault diagnosis problems for oil-filled power transformer based on DGA. Because of the characteristic of improved three-ratio boundary is lack of matching, fuzzy logic in fault diagnosis is presented also to deal with the data of the neural network inputs. DRNN is used to model the fault diagnosis structure, the fuzzy logic is used to improve the faults diagnose reliability. In addition, some cases are used to show the capability of the suggested method in oil-filled power transformers fault diagnosis.
Impact of Large Scale Wind Power Transmission on System Dynamic Stability
Authors: Cheng Jun , Yang Qiang , Zhu Tao , Wang Ai Meng , Hu Xue Feng , Zhang Jie
Published: October 2013

With the scale of the wind farm growing fast, its impact on the power system has become increasingly apparent. So the research has a significant meaning on the characteristics of dynamic stability of the power system which contains wind farms, and the stable operation of the large area interconnected power grid. In this paper it realized the application of the double-fed wind turbine grid model by using power system analysis software PSD-BPA. The analysis of the generator power Angle curve which indicate the state after the failure of N-1 shows as follows: with the wind farms integration on the grid, the damping ratio is decreased slightly but little change after the system failure of N-1, which is still live up to the standard of grid stability.
Excitation Control Based on Objective Holographic Feedbacks and Extended State Observer
Authors: Chang Xian Rong , Zhang Hai Sheng , Wang Hui Yun
Published: October 2013

In order to improve the control effect of the generator excitation controller, this paper proposes an excitation control based on objective holographic feedbacks and extended state observer. First, nonlinear factors of the nonlinear equation is switched to the state equation which contains the control input factors by objective holographic feedbacks. Then, constructing a second extended state observer tracks and compensates uncertain disturbance, simultaneously reduces system parameters of control law. Finally, MATLAB is used for simulation, the results show that nonlinear excitation controller that this paper designs can not only improve static and transient stability of system, but also improve the precision and stability of the terminal voltage control better.
A Study of Visual Wireless Control System Based on MCU in Power Plants
Authors: Cao Min
Published: October 2013

The traditional digital control system generally adopted wired communication, and the operator panel and display system were usually separate, thus having adverse effect on production efficiency. In this study, a wireless visual control system based on microcontroller unit (MCU) was designed, which included a wireless router, a USB webcam, ATmega8L MCU, MG995 servo, and C # language development. This system not only achieved the goals of visual monitoring and control of industrial production by integrating the control panel and display system, but could also improve production and save the cost of industrial energy consumption. The system has been applied in energy-saving control system of thermal power plants.
Research of State Estimation in Power Network Based on Data Mining Technology
Authors: Liang Guo Yan , Gao Yang , Zhang Liu , Xu Ao Ran
Published: October 2013

In this paper, a new method that extracting and fixing load characteristic curve in the power system network state estimation is proposed, based on the combination of The data mining technology in the critical meams assorts algorithm and effective index standards. In the course of the study, this paper put forward a new algorithm ,which simulates used matlab software programming and combined with the actual load data, and extracts load characteristic curve for amended. Revised characteristic curve will serve as a typical load model used to add system state estimation of pseudo measure. The simulation results fully support that the proposed method is rational and effective.
EW-LEACH: Energy Weight-Based Routing Techniques in WSNs
Authors: Gao Lu , Li Zhong Min
Published: October 2013

Wireless Sensor Networks (WSNs) play more and more important role in all kinds of applications. Because of its characteristics, energy consumption is an open issue in research field. In LEACH Cluster Head (CH) is selected randomly without any parameter, such as node energy, distance. There exists a probability that energy consumption is unbalanced in WSN, which causes shortening its lifetime. In this paper, we proposed a new LEACH-based protocol, Energy Weight LEACH (EW-LEACH). The main purpose of EW-LEACH is to provide important parameters, node energy, to determine the CH selection strategy. Node energy acts as a weight to alter the probability that a node becomes CH. The results of simulation show that EW-LEACH increases energy efficiency and prolong the network lifetime.
Evolutionary Game Analysis on Stakeholders Cooperation of Wind Power Integration
Authors: Qiang Zhang , Wang Wei Zhou , Liu Fu Chao , Li Zheng Yuan
Published: October 2013

Large scale integration of renewable is still very challenging due to their intermittency and fluctuations. Aimed at this problem, this paper establishes an evolutionary game model to analysis the dynamic evolution of interests cooperation between the wind farms corporations and the power grid corporations. Then, this paper discusses the relation between multiple variables, such as price of the conventional energy power rate of the subsidy marginal cost of the initial invention and coefficient of distribution of excessive profit, and also analysis how these variables affect the Evolutionary results of this system, based on different replicator dynamics and evolutionary stable strategies. Being at the end, this paper has identified a fair and reasonable distribution coefficient of excessive profit. After equilibrium analysis, a win-win operating mechanism was established to guide the various stockholders to tend to co-operation correctly. Finally, some countermeasures and suggestions were proposed for wind power integration.
Reliability Analysis Method for Distribution System with Distributed Generation
Authors: Kong Xiang Yu , Yan Qun , Sun Wen
Published: October 2013

Distribution system reliability calculation models and assessment methods would change while connected with distributed generation. A reliability analysis method for distribution system with distributed generations was proposed in the paper, which makes an improvement of traditional distribution network minimum cut set method, and the characteristics of distributed generation and distribution network element reliability models are considered. Functional role of distributed generation in the power distribution system failure and distributed power adapter with load strategies were also analyzed in this method. Case simulation analysis was used to verify its effectiveness.
Research on Countermeasures for Investment Estimate Precision of Power Distribution Grid Project in Inner Mongolia
Authors: Zhao Gui Ting , Yang Bao Feng , Zhang Hong Bo , Lu Hui Juan
Published: October 2013

Given the characteristics of power distribution grid project including the huge amount of investment, long construction period, long investment payback period and so on, the precision of investment estimate has a tremendous influence on decision making, economic effect and cost control in each stage. By way of introducing the current situation of investment estimate of power distribution grid project, and analyzing the key factors affecting the investment estimate precision including investment decision-making and management, project design plans, risk and the investment estimate preparation, this paper puts forward improvement strategies aiming at influencing factors in order to promote the rapid development of power distribution grid project in Inner Mongolia.
Research on Constructing the Economic Evaluation of Distributed Energy System
Authors: Sui Yao Guang , Cheng Guo Ping
Published: October 2013

Distributed energy system has realized the energy cascade, high utilization and avoided multiple circulation, transformation, transmission losses, Thus it has higher utilization efficiency and economic benefits than the traditional way of energy , On the basis of the research literature, this paper constructs the economic analysis system of distributed energy system , and selects the instance analysis.
Economic Analysis of Micro Grid Operation in Energy Self-Balance Mode
Authors: Zhao He , Sun Zhi Yuan , Zhang Yu Jia , Jing Tian Jun
Published: October 2013

Micro grid operation cost is the main obstacle of restricting its commercial operation. An effective way to solve this problem is the effective evaluation and the cost reduction by the evaluation. In the micro grid operation cost evaluation, there are not only basic factors, such as the cost of distributed generation and energy storage system, the sale contract, but also the grid backup cost. The indexes about power exchange are adopted to evaluate backup power cost. The data from a smart building micro grid is used to validate the method. It can be seen that the cost of energy, time of use price, and control strategy are of great significance for the operation cost, and good control policy can make the cost of micro grid reasonable.
Post-Evaluation of Electric Power Construction Project Based on Grey Rough Set
Authors: Wang Lei , Liu Shu Yong , Mu Jian
Published: October 2013

The post-evaluation of electric power construction project is an important link, which is necessary in electric grid projects cycle. An advanced method of post-evaluation is proposed by combining Rough Set (RS) theory and Grey System (GS) theory, defined as Grey Rough Set (GRS). According to post-evaluation project experiences, this paper provides the method of index screening by attribute reduction and weight decision.
The Construction and Practice of Energy Consumption Management System for Coal-Fired Power Plant
Authors: Li Zhe , Liang Yun , Ma Jian Wei , Zhang Ping
Published: October 2013

Electric power industry is of great potential on energy saving and emission reduction. Remote monitoring and analyzing on the energy consumption of coal-fired units is important methods and basis for energy saving. The system was developed a data acquisition smart device to acquire the energy consumption parameters, designed the cogeneration units "exceed power" algorithm and the energy consumption general model. The system satisfies the industrial requirements of accurate and reliable data transfer and storage and effectively enhances the rapid modeling capabilities, so as to provide technical support for the energy saving and emission reduction works.
Design and Simulation Analysis of Pile Foundation Ground Source Heat Exchanger System
Authors: Fu Yun Zhun , Du Xin Hui , Zhang Xu
Published: October 2013

Pile foundation thermal response test method was adopted to measure the heat transfer capacity of the pile foundation U-pipe heat exchanger of large buildings in Shanghai. The heat exchanger system of pile foundation buried pipe was designed. CFD numerical simulation method was adopted to analyze temperature distribution characteristics of a single concrete pile and dense arrangement of concrete piles heat exchanger. Further, the number and spacing of ground heat exchanger with U-type pile foundation was optimized design . Finally, the U-shaped heat exchanger was buried in the pile base system which was designed to require 24 piles and pile spacing at 12m.
An Improved Method to Evaluate Energy Efficiency of Large-Scale District Heating System with Boiler Heat Source
Authors: Na Wei , Song Yan , Yang Lei
Published: October 2013

Over 600 million square meter heating area use the district heating system in Beijing up to 2013. The construction and operation level of many heating systems are diverse. It leads to the difference in the heating energy consumption and cost. The obstacles that impacts on the energy efficiency improvement for the district heating system in Beijing were presented. The primary job to reduce the gross heating energy consumption is to evaluate the energy efficiency of the heating system, reasonably. The aim of the paper was to provide an improved method to evaluate the energy efficiency of a district heat system.The energy conversion between the different typical parts of a heating system was discussed: the source, the primary network, the secondary network, the heat exchanger station and the building. Also, six district heating system in Beijing was evaluated by the method to illustrate the proposed technique.
Classification of Capacity Loss Degree of Vanadium Redox Flow Battery Based on Probabilistic Neural Network
Authors: Cao Hong Fei , Zhu Xin Jian , Shen Hai Feng , Shao Meng
Published: October 2013

During long-time charge-discharge cycling, the capacity of the vanadium redox flow battery (VRFB) will reduce gradually. To recognize the capacity loss condition in the time of the operation process, a method for classification of the capacity loss degree based on Probabilistic Neural Network (PNN) is presented. The network inputs are the value of the voltage per second and the average power of the cell stack in any two minutes of the circulation. The network will give out three classes in form of three numbers to classify the capacity loss degree into different levels. The network is trained and validated by experimental data and the results show that the network is suitable for the classification problem of VRFB capacity loss and the method is useful to determine whether the capacity is sufficient and when to restore the cell capacity in real time.
Research on and Analysis of Enhanced Heat Transfer Tubes
Authors: Xi Guan Nan , Xie Wei An , Xie Guo Ru
Published: October 2013

The article makes analysis of the latest research situation and development tendency of several typical enhanced heat transfer tubes, such as spirally corrugated tube, transversely-ridged tube, corrugated tube and converging-diverging tube, as well as comparing their enhanced diathermancy respectively. Therefore, the author’s research will have positive effect on energy utilization efficiency.
Application of SO42-/ Al-Fe-Activated Solid Acid Catalyst Prepared by Cross-Linking Method
Authors: Zhang Yu Li , Hao Xiang Ying , Zhang Cui , Ma De Yun
Published: October 2013

SO42-/ Al-Fe-activated solid acid catalyst has been prepared using cross-linking method, and characterized by FTIR spectra, TG-DTA, XRD analysis. The catalyst is able to effectively catalyse the hydration of turpentine to α-terpineol, with the conversion up to 40% after > 4 uses.