In order to improve the effectiveness of fault feature extraction and achieve the accurate classification of fault patterns in analog circuit, the paper proposed a new analog circuit fault diagnosis method based on preferred wavelet packet and extreme learning machine (ELM). The concept of feature departure...

The rapid development of UHVDC power transmission makes the proportion of external power accepted by provinces increase significantly. This paper aims at analyzing the relevancy of UHVDC power transmission and provincial power source construction from two aspects of reliability and environmental protection,...

Partial discharge detection under impulse voltage is an effective method for monitoring the insulating properties and the aging of high-voltage electric equipment. It is of great practical significance for discovering potential safety hazard in time and ensuring the safe operation of equipment. In this...

As the gradual improvement of environmental awareness in recent years, electric vehicles (EV) have made great progress. The paper first analyses the influencing factors of the electric vehicle's load characteristics, and then selects three load characteristic index of electric vehicle, divides the electric...

Nowadays variable speed constant frequency (VSCF) wind power generation system is adopted in the most wind farms. Its parallel operational characteristics will affect the voltage stability of the power grid. Based on the modeling method of the lumped wind farms, the grid connected wind farm simulation...

When a fault occurs on a transmission line, fault generated high frequency transient components are a series of natural frequencies in frequency domain. This paper proposes a protection algorithm for MMC-HVDC transmission line based on spectrum characteristic of natural frequency. Spectrum correlation...

For the feature of P300's low signal-to-noise ratio (SNR) and difficult classificion, in this paper, we use an EEG signal processing method based on independent component analysis(ICA) and support vector machine. First, make the P300 EEG singal to the superposition averaging, according to the requirements...

According to the characteristics of the electronic cabinet fire, several cases of cable fire experiments with different ventilation rate in real scale electronic cabinet have been carried out. Temperatures of the cable flame and fume, as well as different location near the center of the conflagrant electronic...

For 3D (three dimensions) photoelectric torque sensor with high Integration, there are two problems. One is the optimization of the layout of multi-measurement units, the other is mismatch of stiffness among the dimensions. According to optimize the layout of multi-measurement units, a scheme is proposed,...

In the Grid system connected with shield machine, harmonic pollution and low power factor are the two power quality problems that need to be solved. Reactive power compensation and harmonic suppression are two different aspects of the problem, but their common characteristics provide the possibility...

Shield machine is the large electrical equipment in the tunnel construction, the power quality is directly related to the construction safety and economic benefits of the project, aiming at the shield equipment on Power Grid Reactive Power impact situation, serious harmonic pollution, this paper designs...

In order to limit the induced voltage, 220kV high voltage single core power cable needs reliable grounding in the actual operation. Metal sheath will produce induction overvoltage when lightning intrudes the cable conductor. Inductive overvoltages can have a variety of adverse effects on cable performance....

Aiming at the low voltage, high current and low voltage ripple demand of 100G DSP, this paper presents a power design using LTM4650 as the core device. Analyzing the causes and influencing factors of voltage ripple, a solution that used multi-phase parallel and the low ESR capacitor was applied, to suppress...

Delicacy management of railway power supply and the density of trains increased made monitoring points increased and running changes intensify, a large number of fluctuation data need to be synchronized among different databases, but there are two problems need to be solved: (1) Existing various systems...

With the construction of UHV power grid, power grid operation gradually presents the integration characteristic. Hence, it is much more difficult for the current intelligent power grid dispatching and control system's bus to meet the needs of data exchange among the different dispatching agencies. According...

In order to fix the defect of large-volume-data transmission and system fault tolerance in the current remote proxy, this paper proposes a wide-area data interaction technology which can be applied to the future power dispatching system by utilizing advanced techniques such as elastic extending, load...

In order to study the various furnace arch structure and air distribution on combustion characteristics of chain boiler, based on computational fluid dynamics theory, using numerical simulation method, a three-dimensional physical model for QXL1.4-0.7/95/70-AII type hot water boiler is established, and...

As a kind of renewable energy, wind power energy has the characteristics of randomness and intermittence. The integration of wind farm will affect the safe and stable operation of power grid. Therefore, the accuracy of wind power output prediction is very important for power system operation and power...

Based on the analysis of dead zone compensation principle in H-bridge inverter series structure, an improved average voltage feedforward compensation method of H-bridge inverter series structure is studied. Because the traditional average voltage feedforward compensation method has the phenomenon of...

Melody is the key perception of music. For the heavy sensory nerve deafness, the current cochlear implant (CI) user has the clinical effect on speech recognition, but the music melody and timbre perception is not acceptable, they could not normally perceive music information. Based on CI encoding principle...