A new type of  WPVC(Wind PhotoVoltaic Complementary) power generation system is researched & developed, the system performance-cost ratio is high, the"D/D/D"(Direct-current/Direct-current/Duty-ratio)-"D/D/ D"(Direct-current /Direct-current/ Duty-ratio) MPPT (Maximm Power Poin Tracking) intelligent control...

Eigen-beam beamforming technology is a kind of theory to achieve the demanding beam pattern using the linear combination of soundfield decomposition based on plane wave decomposition theory. The eigen-beam beamforming technology is analyzed and the array optimization is reformulated as the beamforming...

Meteorological satellite images are very important in meteorology, and they have a clear reflection to the process of the weather’s dynamic changes. Remote sensing technology can give the detection and identification to the objective, and it has the effective identification to the weather pictures. In...

According to the study of the practice, description has been given to the crop simulation model and its data acquisition situation, the composition of real-time farmland data acquisition system, as well as the combining point of using both, focusing on the impact of real-time farmland data acquisition...

This paper considered a supply chain system with two manufacturers, each producing a single substitutable product. The products are sold through the common retailer or the manufacturer’s online sales channel. The purpose of this paper is to analyze the equilibrium pricing strategy and profits under different...

In bistatic acoustic scattering wave testing, there will be strong direct blast interference , An algorithm based on vector sensor adaptive signal processing that rejecting of direct blast interference in bistatic sonar has been studied, through computer simulation the effectiveness of this algorithm...

Focusing on the disturbance of ocean reverberation in active sonar detection, this article researched the characteristics of vector ocean reverberation when vector hydrophones were the receivers. By experiments and theoretic analyses, scalar and vector ocean reverberation was gained when transmitting...

In order to hit the target accurately for military missile, its target image must be accurate. However, in practice the target image often encounter noise. Therefore, it is very important of image de-noising, and it has become a key step of the digital image pre-process. In this paper firstly we discuss...

The community structure is one of the most universal and important attributes of complex network, and the community division research of complex network is to reasonably divide the community structure practically existed in the complex network. Apply the thought and theoretical method of supernetwork...

Opinions’ analysis on web news comments is a great significance for the construction of the government's democratic politics, public opinion monitoring and decision support, etc. In this paper we analyze user’s opinion from emotional word, emotional word qualifier, and emotional tendency. We proposed...

This paper introduces the content and characteristics of IEC61850 standard, and the basic knowledge about the model of layered structure and the configuration files. In addition, the application skills of IEC61850 standard in a project are presented via the example of the SCD documenting and configuration....

Given the problems of testing work-load is great, data is inaccuracy and etc in the process of fish gathering lamp light illuminance testing, this article designs and proposes a efficient and fast testing way to fish gathering lamp light illuminance—LED fish gathering lamp wireless synchronous multipoint...

The warehouse management mainly consists of the processes of warehouse entry, warehouse delivery, storage moving and inventory verification. In traditional warehouse management, bar-code technology is widely used while the RFID becomes more and more popular in the modern warehouse management. By contrast,...

An efficiency optimization method of permanent magnet synchronous machine for electric vehicles applications is researched. Considering iron loss equivalent resistance and direct torque control scheme, the relationship of stator flux and power loss is derived based on loss model. And then the real-time...

With the rapid development of computer science and technology, embedded system as a new area of computer application, with its simple, efficient and so more and more people pay attention, Nucleus as a typical embedded operating system, with small, powerful, easy to customize and other characteristics,...

This paper presents a more complex algorithm with Verilog-HDL, which based on the dual-modulus preseted decimal frequency divider. This algorithm can not only increase the accuracy of decimal frequency divider. , but also can be used to divide a clock. Simulations are conducted to analyze the characteristics...

A dynamic sensitivity method is proposed to evaluate the impact of generators’ reactive power on the recovery of key bus voltage in a system post-fault dynamic duration to improve the problem of delayed recovery voltage. Voltage delayed recovery existed in actual power grid is simulated on Guangdong...

In the design and operation in the field of ac power, reactive power is an important factor to consider. Reactive power in the power generation, transmission and distribution of three parties is extremely important, and it is also very important for the normal operation of the load. Based on SVG basic...

Because the static heat capacity is set up on the low probability of occurrence of adverse conditions,this results in the waste of line transmission capacity.This article describes the technique of dynamic Capacity,beidou satellite accurate timing Technology is added to the dynamic capacity-line monitoring...

This paper designs a new kind of photonic crystal splitter. This kind of beam splitter is designed on the basis of the radiant photonic crystals. For improvement points beam splitter transmissivity and joined the tetragonal autocollimation photonic crystal structure. By increasing the autocollimation...

A cloud adaptive chaos particle swarm optimization algorithm is proposed for economic load dispatch problems of power system, which has the characteristics of nonlinear, non-convex and discontinuous. Normal cloud generator was used to adaptively adjust the inertia weight of each particles, so as to optimize...

A track and hold circuit is introduced, which includes a input buffer, a unit gain amplifier, a sampling switch, a current source, a driving NPN transistor and a over-driven protecting circuit. The over-driven protecting circuit is introduced to prevent the transistor of sampling switch from getting...

An amplifier-sharing technique for pipeline ADC is introduced, which share a common residual amplifier between two adjacent MDACs. The circuit and work principle are given in detail. Besides the amplifier-sharing, the comparators are also shared by proper clock schedule. The measurement shows that the...

Analyze the formation mechanism of low carbon benefits of the low carbon power, and combine the economic and low carbon characteristics of a low carbon power by using the low carbon economic factors, redefine low carbon benefits of the power planning and form a comprehensive evaluation model of low carbon...

In order to realize the radar electromagnetic environment simulation, improve radar system combat effectiveness. A simulation system based on reverberation chamber concentrating on radar electromagnetic environment was proposed. The system was made by three processing center. According to the measured...

Based on the modern battlefield electronic reconnaissance, a realization method of netted radar signal sources number estimation subsystem is presented. The cyclic correlation function of linear FM signal is deduced in this paper, and the function is used to estimate the number of signal sources. This...

Fuzzy theory is a forceful analytic tool to the faulty diagnosis of complicated system. A fuzzy clustering method is introduced on the basis of original fault diagnosis. The initial sort is acquired by fuzzy equivalent matrix and F-statistic, and the initial iterative matrix for the fuzzy c-means is...

According to principles of aero-engine fault diagnosis and flight data,this paper introduces a fault diagnosis method based on reformative ART1 neural network.After data pretreatment,it uses four-circumscription and quadratic-estimation to build fault codes and eliminate inveracious fault,and also ameliorate...

BP neural network has two disadvantages, one is to fall into local minimum value easily; the other is the slow convergence. We propose in this paper an approach, including three main operations. Firstly, the algorithm of particle swarm optimization (PSO) is applied to improve back propagation (BP) neural...

Density functional theory (B3LYP) calculations has been carried out to explore the potential energy surface (PES) associated with the decarbonylation of acetaldehyde by Ni+2. The mechanism leading to the loss of CH4 and CO is analyzed in terms of the topology of PES. The structures and energies of the...

he piecewise linear recursive convolution (PLRC)is proposed for cold plasma medium using finite-difference time-domain (FDTD) method. In PLRC algorithm, the electric field with time is piecewise interpolated and the recursive convolution was introduced. The reflection and transmission coefficients were...

The corrosion behavior of rebar HRB335 in 0.5 wt.%, 1.5 wt.% and 3.5 wt.% NaCl solutions was investigated by corrosion rate calculation and corrosion morphology observation. The results showed that, with the increase of corrosion time from 240h to 720h, the corrosion rate of rebar HRB335 in each NaCl...

Isolated DC/DC converters have the disadvantage of inefficiency, instability, magnetic bias and shoot-through problems, etc. They also influence the other electrical devices severely in the same power network. Therefore, a novel photovoltaic off-grid inverter based on the boost converter is designed...

The battery is important storage device in the photovoltaic power system. To reduce the investment cost and to prolong the service life of battery, a three-stage charging methord for battery in photovoltaic power system is presented in this paper. The simulation model of the battery charging system has...

The composite power loads largely need the reactive power. It leads to the decrease of power factor in power grid. The traditional static reactive power compensator is difficult to provide the reactive power compensation for the composite load reactive. Therefore, a dynamic reactive power compensation...

The objective of this work is to design the passive dynamic filter monitoring software. Recently, more and more non-linear loads are connected to the power grid, the distortion of the voltage or current waveform is caused by the serious harmonic pollution. The power harmonic not only does harm to the...

In the power system, the reactive power causes low power factor and power loss. The reactive power compensation device can ensure normal and stable operation of the power system. The traditional reactive power compensation device is difficult to meet the needs of high power factor and low power loss....

In power system, a large number of the inductive loads need the reactive power. These loads always make dramatic voltage fluctuation in power system. The traditional static reactive power compensator is difficult to meet the needs of the adjustable reactive power capacity .Therefore, a dynamic reactive...

The autotransformer step-down starting is characterized by the large impact current and the small short-circuit impedance of autotransformer. Therefore, the improved autotransformer step-down starter is presented in this paper. The following works have been done in the study: topology structure of the...

Plane steel gate is widely used in hydropower station. In this paper,by using the large-scale general software UGNX and ABAQUS, the ecological plugging gate model of a hydropower project and the model without hole for finite element is established. Considering the gate gravity, hydrostatic pressure,...

In the present work, natural convection in a square cavity filled with an electrically conducting fluid has been numerically investigated in the presence of an inclined magnetic field using lattice Boltzmann method. The vertical walls of this two-dimensional cavity are heated differentially while the...

The use of non-linear and time-varying electronic devices, such as rectifiers and inverters, makes the current waveform of the grid seriously distorted. The harmonics generated by those devices have bad effects on the generation and transmission of electric energy. To deal with these problems, a novel...

Al coating is formed on AZ31 magnesium alloy by Cold spraying. plane and cross-sectional microstructure of cold spraying Al coating are investigated. The results show that Al particles are deformed significantly compared with original particles and Al coating is well bonded with the substrate. The microhardness...

In order to solve problems of “jump second” when using only GPS for timing service and inconvenience of installing GPS antennas in some places, we propose a new algorithm combining GPS and NTP to adjust the local clock of an integrated accelerograph. The process flow of the method was described in detail,...

Diamond coated tools of cemented carbide substrate with high Co content are extremely useful for machining difficult-to-cut materials. However, it is very difficult to deposit a well-adherent diamond coating on WC-Co with high Co content because of the strong catalytic effect of Co. In this work, a new...

In this paper, experimental study is carried out for the mixed mode notch-crack transformation propagation in 06Cr19Ni10 austenitic stainless steel with consideration of the material orientation. It is found that after initiation, the new formed crack grows in a direction perpendicular to the applied...

Double-joint strain insulator fittings are the main equipment substations. It is great significance for reducing its maximum electric field strength to avoid corona noise and to improve substation electromagnetic environment. Firstly double-joint strain insulator string fittings simulation model is given...

Transmission line icing coating will lead to ice shedding when ambient temperature rises or the wind increases. It can cause serious security threat to the structure of the transmission line system. In the paper, based on the Lagrange Equation, the analytical dynamics equations of transmission lines...

Smart car is a kind of system which can precisely along the path of automatic driving mazes to the end point and return to the starting point accurately according to the optimal path, Under the effect of control system. In this paper, the hardware/software design and implementation of the intelligent...

This paper discusses the features and applications of the low voltage circuit breakers and fuses, the correct selection and setting of protection appliance for plant power distribution system are analyzed, effectively avoid of the accident and the loss caused by improper selection and setting of low-voltage...

At present, Real-time digital simulation of substation play an important role in analysing the characteristic of the substation, testing relay protection equipment, and building substation training simulation system. In order to create a high degree of similarity with the actual substation, this paper...

Quantization of the mesoscopic circuit with an external power source has been studied in this paper. The exact quantum invariant and wave function of the time-dependent mesoscopic LC circuit with an external power source, has been obtained via the field invariant method. The auxiliary functions in the...

The influence of annealing temperature on the microstructure and H2 sensing properties of Pd-doped SnO2 sputtered thin films were investigated. The as-deposited film was amorphous and would crystallize to tetragonal SnO2 structure when the annealing temperature was above 350°C. The films were composed...

This research studies the magnetic field and forces on the windings of transformer due to short-circuit. Three dimensional finite element computation of three-phase power transformer is carried out. The model developed have been applied to power transformer and the results are verified experimentally....

Aiming at the defects of CAN bus real-time communication in substation automation system, this paper introduces the application mode of CAN bus in the substation integrated automation system and the defect solution. This paper mainly implements the construction manner of CAN bus distributed network system,...

Calculation switching angles online for Selected Harmonic Eliminated technology was achieved in this paper, using linear interpolation method and Newton-Laphson iteration method respectively. Firstly, change SHE nonlinear equations into algebraic polynomial equations, which is for seven-level inverter,...

The working compound electrical loads are characterized by a large number of harmonics. It may pull down the voltage of the power supply network and influence the other electrical devices. Therefore, a control method of dynamic filter for the composite power load was developed. In this paper, a controller...

Due to the dispersion compensation characteristic exhibited by the Photonic Crystal Fiber (PCF), the dispersion compensation based PCF for compensating the G.652 fiber was designed in this research so as to meet the business demands of the fiber communication system. The dispersion compensation characteristic...

This paper studies the frequency synthesis for precision time protocol clock generation circuit, and more particularly focused on a multi-rate phase locked loop structure for generating an output signal at a desired frequency with reduced jitter towards the magnitude of femtosecond. We proposed a unique...

In this paper, a novel overlapping approach between the copper foil windings and copper bar is presented. The electromagnetic field is computed and analyzed using three-dimensional (3-D) finite element method based on an actual SCB transformer with amorphous foil winding. The current density cloud of...

Main insulation electric field of a 220 kV oil-immersed power transformer is calculated. First of all, the main insulation structure is divided into three regions and the corresponding simplified model is established using a two-dimensional axisymmetric calculation field; then typical paths and locations...

In order to calculate stray losses and predict temperature distribution as accurately as possible in power transformer tank walls and other mental constructive parts, an analysis method of the electromagnetic-thermal coupling is presented. TEAM Problem 21 (P21-B, P21a-2, P21c-M1) are adopted to verify...

The article presents a design of CAN(Controller Area Network) communication system based on DSP TMS320F2812. It introduces the hardware circuit and software design methods in detail. The schematic diagram of hardware is shown as well as the program diagram of system receiving and sending data. This system...

In this paper a new diagnostic method utilizing the voltage across the output-filter inductor as diagnostic criterion is presented for the voltage-source inverters. This voltage can be easily obtained by adding a winding across the inductor, thus the sensor is needless and the diagnostic system is naturally...

In this work, in order to solve the problem of longitudinal water resistance for XLPE power cable, nine kinds of corrugated aluminium sheath with different embossing depths and pitchs were pressed by argon arc welding machine. Each sheath was cut into six equal parts to study lateral pressure. After...

An adaptive protection scheme using digital relays is proposed for the protection of the distributed systems. Firstly, the impact of distributed generators on protection coordination is discussed. Then, an adaptive protection scheme is proposed for distributed systems with distributed generation (DG)....

The value setting of the traditional distance protection has become very difficult for the distribution system with distributed generators (DGs) owing to the randomness of the DG output power. This paper proposes a new adaptive distance protection scheme to solve this problem. Firstly, on the basis of...

MB8 magnesium alloy was treated by using HJ-III type ultrasonic impact treatment machine. The effect of ultrasonic impact treatment parameters on the microstructure, residual stress in the surface and corrosion resistance was investigated. The test results indicate that the grain in the treated area...

The HVDC line fault location methods at home and abroad are surveyed in this paper. Firstly, the disadvantage of the existing fault location techniques of HVDC transmission line is analyzed, and it points out that the engineering applications of fault location based on traveling wave principle is most...

Acorrding to the poor effect of traditional voltage stability method in the actual power network, a new method, combination of the P-V curve and modal analysis, was put forward. First, Kp(power reserve coefficient) was calculated to measure the power system static voltage stability margin through P-V...

At present, mankind is faced with serious energy problems, as the energy-hungry, power energy saving is significant. Compared with the traditional single reheat unit, using secondary reheat to further improve the thermal efficiency of the unit, and meet the requirements of the unit low pressure cylinder...

10 kV lines reactive compensation of the rural power distribution network can effectively decrease the loss, improve power factor, improve the voltage quality. 10 kV lines automatic switching control of reactive power compensation devices, are usually classified as according to the voltage switching...

It analyzes the common bifurcation categories in active distribution network; based on the active distribution network's wind field system model, it changes the reactive power parameters of its load model and conducts studies on the influence brought by reactive power on voltage stability based on bifurcation...

The problem of wave propagation in a semi-infinite medium and its interaction with the structure was awalys encountered in the engineering numerical simulation.Artificial boundary conditions of truncated place in semi-infinite domain is the key to ensure accuracy of the calculation results.Adopting fixed...

Since multiphase machines have more additional degree of freedom than three-phase machine, which can be utilized to control other machines, a number of machines can be controlled independently. The stator windings of the machines can be series connected by an appropriate phase transposition, with the...

Double Rotor Motor Power Coupling System (DRM-PCS), as a new kind of power coupling system, can be used in hybrid electric vehicle to make the engine operate efficiently by decoupling the engine speed from the wheels. In this paper, the thought and method of the engine optimal control are put forward....

Deflection nose is a new concept of fast response control mode, partial nose of projectile can deflect certain angle relative to the axis of projectile body and pressure difference emerges in the windward and leeward side of warhead then generates aerodynamic control force, and this control way has high...

This paper developed multi-layer corrugated steel plate isolators in order to meet the needs of isolation in marine power systems, and the main parameters which affecting the performance of corrugated steel plate isolator are studied through the static experiments. The experimental results show that...

The model of LNG cold energy recovery consisting of a Brayton cycle and a Rankine cycle is constructed in Aspen Plus. The effects of the inlet and outlet pressure of the turbines, ammonia-water flow rate, condensing temperature and the compressor outlet pressure to the thermal efficiency of the combined...

This paper study sensor-less fault diagnosis on rolling bearing of wind turbine generator system, by means of establishing an experiment that can simulate doubly fed wind power generation system, on basis of the mathematical model that reflects magnetic flux density impacts on the electrical signal,...

In order to study the response characteristics of the wind turbine drive system gear fault in its electrical signal in the stator theoretically, on the basis of considering the gear mesh stiffness change and simulating the broken gear fault characteristics, building the gear vibration dynamics differential...

Based on Darcy-Brinkman-Forchheimer flow model, this study analyzed the viscous dissipation effect on the forced, fully developed convection heat transfer in the flat channel filled with saturated porous medium of power-law fluid. Moreover, it derived the dimensionless calculation formulas for the axial...

This paper uses the least squares method, BP neural network and gray GM(1,1) model for trend forecasts and predicting the remaining life of the aero-engine fault parameters. By comparing the results of the three methods, the least squares method and BP neural network method predicting results are more...

This paper studied doubly fed induction wind power generation system and modeld its wind turbine and generation. The vector control algorithem was proposed to conduct MPPT (Maximum Power Point Tracking) strategy. An experimental platform was built based on DSP of TMS320F28335 series.The experimental...

The water polluters of Liao river in Liaoyang is elected preliminarily basing on the basin of the key water polluters of Liaoyang city, combining with the principle of polluters screening and the computing method of equal standard pollution load, optimizing and assessing the indexes which involves the...

In this paper, aiming on the sub-synchronous oscillation (SSO) of hybrid AC-DC transmission system which contains modular multilevel converter based High Voltage Direct Current (MMC-HVDC), the coordinated control of sub-synchronous oscillation damping controller (SSDC) and supplementary excitation damping...

The distribution transformers are easily damaged when struck by lightning, the reliability of power supply and distribution system as well as the operational safety will be affected seriously. Therefore, it is necessary to find out a relatively thorough lightning protection measure, to ensure the safe...

Large-scale grid-connected operation of photo-voltaic power station will influence the stable and economic operation of the grid. Effective forecast method of photo-voltaic power outputs is benefit for the whole scheduling and reasonable operating of the grid. A prediction method based on Markov chain...

Based on the small trial of tidal flow artificial wetland, alkali-treated corn straw is used as carbon source supplement for denitrification. The author studys the effect of adding different amount of carbon source on removal efficiency of TN, NH4+-N, NO3--N, NO2--N and COD in the system. The results...

With the Z-scan method, the nonlinear optical properties of the sample of Ethyl red (ER) in ethanol solution (in which the content of ER is 1% by weight) were measured using the lasers of three wavelengths (441.6nm, 535nm and 633nm) respectively. As a result, the effective indexes of refraction n2 of...

Compared with the traditional serial robots, parallel robot has prominent features such as high rigidity, high bearing capacity, high precision, small error, low motion inertia and inverse kinematic solutions easily, which makes parallel robot widely used in light industrial automation production line...

The influence of the front intake grille shape on the aerodynamics of a passenger car is studied,and a numerical simulation is made on a full-scale CAD automobile model with different grille shapes, including straight, convex, concave, and M and W-shaped. The results show that the drag coefficient Cd...

Acceleration signal is widely used in fault diagnosis of power machine, which can be numerical integrated to obtain displacement data. DC components and trend terms can’t be avoided in acceleration signal and it will be magnified during integration, causing distortion of the displacement waveform acquired....

Reheat system of PWR nuclear power unit in use of steam reheat method.Heat recovery system and reheat steam system of PWR nuclear power units with strong coupling, so the impact of changes in heat recovery steam extraction pressure loss of nuclear power plants is more complex than thermal power.According...

Security and stability control systems (SSCSs) are effective measures to ensure the safe operation of power grids. A normal SSCS has a complex structure and is specific targeted. Therefore, it is difficult to model SSCSs accurately in large scale power system dynamic simulation. A new modeling method...

In computational fluid dynamics programming, meshing quality determines the reliability of the results of numerical calculation. For numerical programming in heat and mass transfer of U-type ground heat exchangers (GHE) in ground source heat pump (GSHP) systems, considering the limitation of the structured...

On the basis of the main thermal recovery wells casing damage characteristics, the temperature rise of the casing-cement is clearly defined by the simulation analysis of thermal recovery wells wellbore temperature field at the end of steam injection. Based on the theory of thick wall cylinder in the...

A fuzzy expert system which can simultaneously support many kinds of rules including fuzzy production rule, fault tree and decision tree in a unified framework are researched. Fuzzy rete algorithm is adopted to speed up the fuzzy reasoning chain. A wind turbine diagnosis expert system is developed based...

For large wind-photovoltaic-storage hybrid system, in order to maximize the match between output of the hybrid system and the scheduling plan, it is very important to coordinate the output power of wind, photovoltaic and energy storage system. Taking the uncertain of wind, photovoltaic generation and...

Large diameter bagged concrete bored pile has entered into the project practical stage as a new technology that guarantee the concrete durability in saline soil area, there is no construction norms, standards and test methods for large diameter bagged concrete bored pile at present. According to the...