The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Wireless electric vehicle (EV) charger has become increasingly popular because of its improved convenience and safety and its advantage of smaller green-house gas (GHG) emissions. The power control method of the wireless power transfer (WPT) system has great impact on the performance of the charger. In order to simplify the power electronics converters and improve the reliability of the system closed-loop...
The converter transformer epoxy impregnated paper bushing is a multi-media electrical equipment, and the main materials include the internal conductor, the external conductor, transformer oil, SF6 gas, the air inside internal conductor, the main insulation material epoxy impregnated paper, sheath, and fittings. In actual operating, the converter transformer bushing is undertaken by the harmonic current...
For the harmonic resonance problem of the photovoltaic multi-inverter parallel grid-connected system, this paper mainly analyzes the resonant characteristics of the LCL interface circuit. The model of the LCL interface circuit is given, and with the increase of grid-connected inverter number, the resonant characteristics are analyzed respectively which the circuit system is stimulated by the harmonic...
The purpose of this paper is to present a practical dynamic model of fiber optic gyro (FOG). In terms of the sampled data, theoretically and practically provide the optimal engineering solutions. Based on ARMA(p, q) modeling, engineering application methods can be ameliorated. By segmenting the composition in the form of signals, the model is more reasonable and reliable. Approach mentioned in the...
Epoxy resin has been widely used in dry-type insulation application such as DC dry-type bushings. In practice, DC dry-type bushings work not only under DC voltage, but also under multiple harmonics with 50Hz fundamental frequency. This study focuses on the effects of space charge behavior of epoxy resin on real voltage of DC dry-type bushings. By using Fourier decomposition, the real voltage of DC...
It is of significance for the research on traction power supply system power quality and the analysis on its impact on the grid to simulation of V / V traction transformer simulation. Based on this, a typical unbalance V / V traction transformer model and load model electric locomotives are created in PSCAD / EMTDC, SS9 electric locomotive is used when simulation. V/V traction transformer with the...
Compared with the traditional ACIDC traction load, the AC-DC-AC traction load has its unique feature. The power electronic device brought by it certainly will have an effect on the power quality of the grid. The principle and modeling of the typical AC-DC-AC electric locomotive - CRH2 and its tractive power supply system is studied in this paper. The utility model of CRH2 and the Guilin power network...
In order to analyze the problem of synchronous machines under unbalanced steady state operation, the relationships of fundamental-harmonic waves (RFHW) between phase and dq 0 coordinates are proposed in this paper by utilizing Park and its reverse conversion. Utilizing the matrix overloading technique (MOT), a fundamental-harmonic model (FHM) in form of three-phase impedance matrix is derived and...
Nowadays, hybrid cascade multilevel technology has attracted a increasing concern, especially in moderate-voltage and high-power applications. In this paper, a design method about how to design main circuits of active power filters(APF) with hybrid cascade multilevel structure is proposed. Through careful research, the combination of these cascade multilevel H-bridge modules is properly chosen and...
We experimentally investigate the high order harmonic generation (HHG) from aligned CO2 molecules and demonstrate that the modulation inversion of harmonic yield with respect to molecular alignment can be altered dramatically by the intensity of the driving laser pulse. The laser intensity dependence of the angular distributions for the 19 to 27 harmonics is also directly measured. HHG has been proven...
We propose a scheme to generate isolated attosecond pulse in 270-400 eV spectral regions from high harmonics generation. An extreme ultraviolet supercontinuum from 280-340 eV can be selected to yield an isolated 67 as pulse.
This paper presents a novel measuring algorithms of frequency characteristic by using curve fitting techniques. In comparison with other method, the proposed algorithms can effectively improve the measuring precision in the presence of Gauss noise and harmonic disturbance. Simulation results have shown the effectiveness of the proposed scheme
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.