Tài liệu Điện - Điện tử

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Carrier level layered modulation method can filter out the harmonics of cascaded H - bridge topology

Analysis of the reason of cascade H-bridge inverter topology using carrier phase shift modulation method cannot compensate the harmonic, using carrier level layered modulation method can solve the problem of cascade H-bridge topology that it cannot compensate harmonic problems.

3/29/2020 12:23:54 PM +00:00

Power quality disturbance location method based on cross feedback - recursive least squares

Due to the randomness and complexity of power quality disturbances, there is lack of mature and reliable detection and analysing methods on power quality disturbance, especially in the construction site with the changeable operation condition.

3/29/2020 12:23:48 PM +00:00

Design of a bifocal single reflectarray antenna with improving beam scanning performance

A novel scheme is introduced to design the high gain beam scanning reflectarray antennas for limited scan range application. At first, various existing schemes for beam scanning reflectarray antennas design are reviewed and it is concluded that as a convenient design scheme, the feed displacement technique is preferred for limited scan range applications.

3/29/2020 12:23:41 PM +00:00

Modeling and simulation of aviation engine ignition spark frequency disorder

Igniter is an important part of aircraft engine, which should be reliable to ensure safety. Spark frequency disorder is common fault to the aviation ignition device, and it is great hidden danger to the aircraft engine. To guarantee the safety and reliability of aviation igniter, the fault mechanism of the aviation ignition spark frequency disorder is researched in this paper.

3/29/2020 12:23:36 PM +00:00

The chemical properties of air-water discharge induced by double die-lectric barrier discharge

A set of air-water discharge induced by double DBD device has been designed to obtain hydrogen peroxide (H2O2) and ozone (O3) levels, simultaneously. How the H2O2 and O3 are being produced, which have extensively been studied by different experimental approaches such as air cooling, atomization amount, voltage applied, pH value and electrical conductivity (EC).

3/29/2020 12:23:30 PM +00:00

A 24×24 microstrip array antenna at K-band

A 24×24 microstrip array antenna for Doppler radar is presented. For the low side lobe, the feeding network of microstrip array antenna is used for Taylor series amplitude weighting. The side lobe of microstrip array antenna is less than -18.5 dB at 24.15GHz. The proposal design is confirmed by both simulation and measured results.

3/29/2020 12:23:23 PM +00:00

Strategic research on China domestic power system modeling

Power system modeling is a software management tool for managing electricity demand, power system trading electricity and power system generation expansion planning purposes, through the combination of various models and their comparison.

3/29/2020 12:23:17 PM +00:00

Dependence of the deformation of 128 x 128 InSb focal plane arrays on the silicon readout integrated circuit thickness

The square checkerboard buckling deformation appearing in indium antimonide infrared focal-plane arrays (InSb IRFPAs) subjected to the thermal shock tests, results in the fracturing of the InSb chip, which restricts its final yield. In light of the proposed three-dimensional modeling.

3/29/2020 12:23:11 PM +00:00

Design of system for electromechanical equipment condition monitoring in real time based on DSP and CPLD

A multi-parameter monitoring system has been designed for mechanical and electric equipment based on DSP and CPLD. Designing methods for hardware and software are introduced in this paper.

3/29/2020 12:23:05 PM +00:00

Power quality evaluation of distribution network containing microgrid based on PCNN

Aiming at the nonlinear relationship between the evaluation indexes and the complex grade of power quality, a power quality evaluation method is proposed based on model of pulse coupled neural network (PCNN). The operating schematic is analyzed according to PCNN modeling.

3/29/2020 12:22:59 PM +00:00

Property analysis and experimental study of the broadband transmission line transformer in multimode feed network

Transmission-line transformers are circuits useful for microwave impedance matching applications due to their broad operating bandwidth. Multimode feed network is composed of two substructures, which are constituted by the transmission-line transformer.

3/29/2020 12:22:53 PM +00:00

Feature analysis on atmosphere laser communication channel under rainy condition in the tibetan plateau

In the Tibetan Plateau, due to lack of raw experimental data sets and proper data analysis method, investigations on atmosphere laser communication channel (ALCC), especially under rainy condition, are rarely concerned by researchers. Neural network group and optimal weight initialization technology (OWIT) are adopted in the analysis process.

3/29/2020 12:22:46 PM +00:00

Research on multi-stage generation and transmission coordinated planning model considering wind power integration

Decentralized planning mode of power generation and power transmission is facing enormous challenges at present, and all kinds of uncertainties that impact on the planning have become increasingly evident.

3/29/2020 12:22:40 PM +00:00

Study on water-cooled solar semiconductor air conditioner

Aiming to compare the cooling effect, two types of solar-powered semiconductor air-conditioning devices were designed in different structures. According to the cooling load in an experimental room, the solar panels and battery capacity were determined for the development of a test system.

3/29/2020 12:22:34 PM +00:00

Sneaking operation modes in zero-current switching converter

This paper reports the occurrence of some abnormal operational modes in soft-switching converters. By constructing a Boolean matrix based on the states of the switching components, some unexpected topological states are identified. Consequently, these states excite the abnormal or sneaking operational modes as referred.

3/29/2020 12:22:28 PM +00:00

Different-lags synchronization in time-delay and circuit simulation of fractional-order chaotic system based on parameter identification

This study constructs a novel four-dimensional fractional-order chaotic system. It verifies chaotic nonlinear dynamic behaviors and physical reliability by numerical simulation and hardware circuit design.

3/29/2020 12:22:22 PM +00:00

Differentiation coherence algorithm for steady power flow control

This paper researched steady power flow control with variable inequality constraints. Since the inverse function of power flow equation is hard to obtain, differentiation coherence algorithm was proposed for variable inequality which is tightly constrained.

3/29/2020 12:22:15 PM +00:00

Probability model of power equipment maintenance based on full state process

Equipment maintenance is one of the core tasks in power system operations. The premise and foundation for maintenance is to establish a power equipment maintenance model, which should reflect all equipment states accurately including operation, inspection and maintenance.

3/29/2020 12:22:09 PM +00:00

A modular approach to power flow regulation solution

This new solving method is not featured in minimum variables however it is featured as a one-time simultaneous solution. Through the IEEE 5 bus system, the analyzing cases of total differential sensitivity and operation under conditions of constant line power and constant node voltage were carried out, these cases described the fact that the mixed variable solving method of power flow regulation has a simple form, small calculation volume and efficiency.

3/29/2020 12:22:03 PM +00:00

Reconstruction technique based on the theory of compressed sensing satellite images

This article firstly discusses the study of satellite image compression based on compression sensing theory. It then optimizes the widely used orthogonal matching pursuit algorithm in order to make it fits for satellite image processing.

3/29/2020 12:21:57 PM +00:00

Optimization of a multi-pendulum wave energy converter

In order to improve the energy capture efficiency of a multi-pendulum wave energy converter, a mathematical model of the pendulum structure has been built. The final structure parameters of the pendulum have been obtained by using genetic algorithm based on the numerical simulation results of the pendulum structure optimization.

3/29/2020 12:21:51 PM +00:00

On improving the time synchronization precision in the electric power system

In this article, the time unifying terminal equipment has adopted the BeiDou satellite navigation receiver as the clock source and the output standard is IRIG-B code. The simulation results show that the algorithm reduces the synchronization errors of IRIG-B code, improves the timing synchronization precision, and fulfills the requirement of timing accuracy in the power system.

3/29/2020 12:21:45 PM +00:00

Study on energy efficient operation of air conditioning cooling water system

The control logic of frequency adjustment for pump and cooling tower fan has been presented in this paper, based on the operation mode of a chiller with one pump and one cooling tower. Optimum outlet water temperature control of cooing tower has been put forward through analysis and comparison among factors influencing it, based on measured data.

3/29/2020 12:21:38 PM +00:00

Field analysis on magnetic transmission mechanism of downhole tur-bine generator

This paper mainly studies the field on magnetic transmission mechanism of down hole turbine generator by using ANSYS software. The effects of thickness of permanent magnets, thickness of distance sleeve, the average radius of working field, air gaps and rotating speed on torque were quantitatively analyzed, and eddy current in distance sleeve with different structure parameters was also analyzed.

3/29/2020 12:21:32 PM +00:00

Harmonic frequency estimation based on modified-MUSIC algorithm in power system

This paper presents a new harmonics frequency estimation method. Unlike the conventional harmonic frequency estimation method (fast Fourier transform), the new algorithm is based on spectrum analysis techniques often used to estimate the direction of angle; the most popular is the multiple signal classification (MUSIC) algorithm.

3/29/2020 12:21:25 PM +00:00

Research on ring fire diagnosis of DC motor based on discrete wavelet lipschitz index

The favorable localization features of discrete wavelet provide a new method for detecting the mutational points of electric spark signal. In this paper, by means of discrete wavelet function called db5, using the way of 6 scales wavelet, analyzing the gathered electric spark signal and by extracting the modulus maxima of the 6 layers detailed signal coefficient, the signal’s mutational points were located exactly and successfully.

3/29/2020 12:21:19 PM +00:00

An investigation of super threshold FinFET logic circuits operating on medium strong inversion regions

In this paper, basic FinFET logic gates based on static logic, DCVSL (Differential Cascode Voltage Switch Logic), PTL (Pass Transistor Logic), and TG (Transmission Gate) logic styles operating on medium strong inversion regions are investigated in terms of power consumption and delay.

3/29/2020 12:21:13 PM +00:00

Filter design based on DSP builder

Presents a method to realize FIR filter based on DSP Builder, FIR design using a relatively independent function of circuit module and subsystems in the design, it can easily realize the filtering function of FIR, simplified the design, modular design method greatly shortens the development cycle, make the system have been optimized in the chip area and timing analysis etc.

3/29/2020 12:21:07 PM +00:00

Operation modes and energy analysis of a new ice storage airconditioning system

Based on the idea of temperature and humidity independent control, a new air-conditioning system is presented, which combines ice storage air-conditioning system and capillary radiation air-conditioning. And the ground-source is also applied to provide high temperature for the cold source for capillary radiation air-conditioning.

3/29/2020 12:21:01 PM +00:00

The impact of DC-power layout on stray inductance of bridge arm in power converters

This paper mainly analyzes the influence of DC-power layout on the stray inductance taking a subway traction converter as example. The Psim9.0 software was used to calculate the stray inductance.

3/29/2020 12:20:55 PM +00:00