The development and protection of electronic and electrical industries are essential parts to America’s national strategy. Using data from UNCOMTRADE database, This paper analyzed trade patterns in electronic and electrical products (HT1 category in Rev.2 classification) in the US from 2008 to 2017....

Accurate voltage stability analysis and online monitoring are essential to ensure a secure operation of the power system. To this end, researchers have proposed a variety of voltage stability indicators and analysis methods, of which, the voltage stability analysis method based on Thévenin equivalent...

The optical current transformer play an important role on the security and stability of the power system especially HVDC. The HVDC control and protection system cannot be field verified without field simulation for the optical current transformer secondary signal. But the existing method for field simulation...

Considering the impact of distributed power on the net load, the short-term load forecasting model established by SR-LS-SVR from the global perspective of the distribution network. The model parameters are quickly optimized by fine-grained parallel PSO. The accuracy, robustness and efficiency of the...

Static Var Generator (SVG) is a new generational dynamic reactive power compensation system and the detection of directive current generally uses ip-iq operation mode. However, the command value of output reactive current only depended on the reactive current detection of main circuit based on the ip-iq...

This paper proposes a photovoltaic-grid complementary electric vehicle charging system based on whale optimization algorithm, including control part, traditional electric energy and photovoltaic energy supply part and electric vehicle charging equipment part. The electric vehicle is charged by the complementary...

The prevailing method based upon the oil-paper balance curve for evaluating the moisture content in transformer pressboard is faced with serval limitations. Therefore, the aim of this paper is to report an available approach to accurate predict the moisture content of pressboard. The published researches...

A readout circuit with low leakage current is presented which performs leakage current suppression and integration linearity enhancement. An additional transmission gate is added to suppress the leakage current by forcing each end of MOSFETs in the transmission gate to be equal so that the discharge...

This paper introduces the principle of electromagnetic induction of the high tension line. With the aid of the spark plug, induced charge can be transferred to the high voltage winding in the form of short pulse and then generate induced current .With the appropriate circuit, the induced current can...

In order to improve the defense ability of the passive electromagnetic armor (PEA), the parameters of the armor are optimized based on the orthogonal experiment. It analyzed the working principle of the PEA and the phase change of metal jet, and then the temperature control equation of the metal jet...

With the deterioration of environmental and energy problems, the demand for large amounts of new energy interconnection has become increasingly strong. However, the fluctuation of new energy will impact the stability of power grid. This paper describes the development and application status of energy...

In this paper, a novel three-phase four-wire photovoltaic system is proposed for the compensation of harmonic, reactive and three-phase unbalance in the distribution network and the demand for renewable energy generation. A novel three-level DC/DC converter is adopted for photovoltaic arrays and energy...

Building a ubiquitous power Internet of Things is a key measure to achieve “three-type and two-network”. After long-term development, energy storage devices have become an indispensable part of the power grid. The number of electric vehicles in the country is strongly supported, and the number of uses...

To evaluate the health status of the power distribution network is of vital importance to condition-based maintenance of the power distribution network. By studying the power distribution network health condition using the theory of health index (HI), this paper proposes a method to evaluate the power...

The analysis of fault transient characteristics of flexible dc distribution is the basis of dc distribution protection technology. Based on the construction of the two-terminal power supply code flexible dc distribution system, the problems of different system grounding methods are analyzed in detail,...

The high-permeability Distributed Generation (DG) was connected to the power grid, so that the state estimation of the active distribution network(ADN) needs to consider the uncertainty of the DG output. In this paper, an interval state estimation method for active distribution network considering the...

In this paper, a waveguide-single-cavity structure in a square-lattice photonic crystal is proposed to generate Fano resonances by the interference of two split modes in the structure with a rectangle defect column in the cavity. Through analyzing the band map of the modes in the bandgap region, Fano...

Based on the cable transmission line simulation method, this paper conducts cable string simulation analysis on common power signals, including: 115V 400Hz single-phase AC, 220V 50Hz single-phase AC, 380V 50Hz three-phase Y-type AC power. Meanwhile, through the programmable power supply, using the electric...

With the rapid development of DC transmission in recent years in China, frequency stability has become a key issue for the normal operation of the entire asynchronous interconnected electric system. When the external DC transmission line experiences a fault, the frequency of the electric grid at sending...

In order to solve the problem of design of bistable permanent magnet mechanism with vacuum interrupter, this paper firstly chooses the dimensions of the permanent magnet mechanism and the selection of material properties according to the mechanical parameters of the vacuum interrupter. Using the electromagnetic...

Hub motor has poor heat dissipation conditions limited by the installation space and working environment, high temperature rise in the process of operation has been a bottleneck to further improve the power density and torque density. The increase of power density means the increase of motor loss density...

This paper explains the urgent need for, and technological bottleneck of, current portable general-use infrared detectors, and several proposals have been put forward and carried out. Specifically, the TEC semiconductor cooler was adopted to achieve the positive and negative temperature difference required...

This paper analyzes the current status and problems of ensuring the maintenance of the thermal imaging infrared equipment and proposes a software design scheme, algorithm and programming for the test and diagnosis system of universal portable thermal imaging infrared equipment, which provides expert...

Aiming at bearings-only multi-target tracking, a new multi-sensor particle CPHD filtering algorithm is proposed, which analyses the structure information of mixed linear/nonlinear state space models and combines particle filter and Kalman filter to predict and estimate the states of multiple targets...

The service life of the transformer is determined by its solid insulation performance. However, it is a rather difficult job to quantitatively evaluate the aging conditions of cellulose insulation materials of the transformer by traditional methods. The existing researches show that the cellulose aging...

To solve the problem of quantitative identification of the state of Duffing oscillator and determination of the critical threshold of reference amplitude, a combined weak signal detection method is proposed in this paper. The STFT statistical characteristics of Duffing oscillator in chaotic state, intermittent...

Fault diagnosis of locomotive wheel-bearing is directly related to the locomotive performance and the safe operation of train. Owing to the fault signal of locomotive wheel-bearing being difficult to separate, the fault diagnosis method was proposed, which based on wavelet packets and morphological component...

The model parameters of 8/6 poles switched reluctance motor (SRM) were determined through using the measured magnetization curve and the establish BP neural network model, selecting Sigmoid function as the hidden layer activation function and using gradient descent method to train the network. The simulated...

For the multi-parameters evaluation problem of wind turbine operational status, the principal component analysis (PCA) methodology is firstly used to reduce dimension, standardize and de-correlate to the SCADA data of wind turbine operation, and get the principal component of the wind turbine operational...

Both the high frequency pulsation signal injection method and sliding mode observer (SMO) can be utilized to identify the position of permanent magnet synchronous motor (PMSM) sensorless system. When the speed of motor runs high, the high-frequency signal injection method is no longer utilized. When...

At present, it is difficult to grasp the distance behind the vehicle when reversing vehicles, especially ultra-long and ultra-high vehicles, and there are some potential safety hazards. In order to solve this potential safety hazard and enable vehicles to park in garage more quickly and accurately, this...

Because the inertial measurement system based on traditional inertial device cannot meet the requirements of the new tactical weapons, this paper demonstrates an inertial measurement system using full digital fiber optic gyro, impact resistant quartz accelerometer and ontology thin-walled reinforced...

In order to realize a system of multi-channel telemetry signal transmitter and receiver module, a design for generating encryption and decryption processing signals in the transmitting module and the receiving module is proposed on the baseband signal processing hardware platform. For the generation...

To achieve cost reduction and efficiency increase of module products, the multi-busbar technology has recently been applied in photovoltaic crystalline silicon modules. Compared with the current five busbar modules, the multi-busbar modules use round ribbons to reduce the resistance loss and increase...

Different annealing process and the same quenching tempering process were used to execute the heat treatment for Q235Ni0.1Zr0.1Y0.1 new low alloy steel structure, and the microstructure of the steel structure was observed and the mechanical properties and damping performance were analyzed. The results...

Aiming at solving the problems of low-efficiency and high-cost of existing auto-focusing methods for microscopic imaging, an on-line auto-focusing method is proposed and developed using dual photodetectors. Firstly, two identical photodetectors are placed in symmetrical positions with equal distance...

Based on the cable transmission line simulation method, crosstalk simulation analysis is performed on complex cable harnesses commonly used in high-speed EMUs such as power cables, DC power cables, communication cables and signal cables. Through the simulation operation, the waveform and amplitude of...

The existing metric learning based Person Re-Identification are challenged with large appearance variations across non-overlapping cameras. In this paper, we propose to learn a similarity metric that incorporates robustness against cross views appearance variations. The robustness in metric learning...

Accurate traffic congestion detection methods are needed urgently to improve road traffic pressure and congestion, especially in metropolitan areas. This paper proposes TraD-VANET, a new road traffic detection system that employs RFID-based active vehicle positioning and vehicular ad-hoc networks (VANETs)...

In order to improve the working efficiency of drugs input in intelligent pharmacy express dispensing system, the route planning based on the improved genetic algorithms is proposed for express dispensing system with complicated boxed drugs and numerous storage space. This paper establishes a TSP problem...

Risk assessment is vital to an information system. Current approaches usually rely on human experts’ experience to give scores to vulnerabilities in the information system and synthesize the scores to form the whole risk score of the system. The experts give such scores by understanding a vulnerability...

License plate recognition is widely used in road conditions, parking, dredging traffic, etc. The license plate recognition first needs to find the specific location of the license plate and then needs to identify the content of the license plate as an image. During practical applications, main challenges...

Absorption and scattering are two common methods to characterize the physical and chemical properties of substances. However, the combined application of the two techniques in situ detection is difficult. Taking biological tissues as an example, proteins and pigments absorb visible light strongly, and...

In order to reduce the sidelobe level of antenna array, optimize the minimum element space spacing and element number of the antenna array, it is proposed optimizing technology for sparse antenna arrays design. The linear gradient aperture function and the stepped aperture function are used to select...

In recent years, with the rapid development of the economy, China's building energy consumption has increased year by year, and energy conservation has become an inevitable requirement for development. Among them, the impact of human settlements on building energy consumption is obvious, and the study...

This paper discusses in detail the characteristics, design basis, functional framework, process management and implementation mode of the data platform system for the systemwide supervision and management of the intelligent mine in the opencast coal mine, and expounds the application prospect of the...

Based on the new institutional reform, medicine supervision was featured with targeting, elaborating and promptness ability. Base on the binary full life cycle analyze and the clarifying of informationized supervision construction and reformation system arrangement, this article divided food & drug informationized...

The radar interference effect evaluation method is a research hotspot in the field of radar countermeasures. In a complex battlefield environment, the assessment of interference effects by a single indicator usually does not reflect the actual state of the battlefield. Aiming at the complexity of radar...