Advanced Materials Research Vols. 1061-1062

Abstract: To meet the demand of the signal stable at high speed, the key is control precision for the characteristic impedance of FPC. This article is intended to study the strip-line structure for reducing cross-talk (noise) and their theoretical analysis and calculation. By varying effect factor and countermeasure in the production process of FPC, and the optimal process parameter have been obtained. By using the some testing technology, the impedance of strip-line in FPC have been tested.

Abstract: Due to IGBT open-circuit fault of CRH2 EMU’s traction inverter, a method of its fault diagnosis with the three-phase current signals as detection objects is conducted. By applying the wavelet analysis, three-phase current signals are decomposed for four times. With the coefficients of each layer obtained, the energy values of layers are calculated as well as the vectors corresponding to failure modes. According to the vectors regarded as input and the expected output, a BP neural network is established. Through training the network, the parameters of network can be defined. In addition, to test and evaluate the performance of network, certain noise is added to the three-phase current signals. Simulation results show it is feasible for the fault diagnosis of traction inverter.

Abstract: Research on the lightweight issue of DC-link is an important direction in modern AC drive electric locomotive. Canceling LC filter circuit is an important way to achieve the goal of lightweight. Therefore, this paper focuses on single-phase pulse rectifier without LC filter circuit. The generation mechanism of DC voltage ripple and network-side current harmonics in grid-side converter is derived. Then, aiming to eliminate the current harmonics, the N-order notch filter and PR controller are introduced to the double-loops controller. The loop of voltage outer controller with N-order notch filter can filter out the ripple of DC-side voltage effectively without affecting the dynamic performance of the controller system. Meanwhile, the loop of current inner controller with PR controller can achieve zero steady-state error control to both the fundamental and harmonic current, and can suppress the low order harmonics in the line current effectively. Analysis shows that replacing the original L₂C₂ filter circuit with software controller is feasible. Finally, the validity and effectiveness of the proposed scheme are verified in computer simulation.

Abstract: Against the State Grid Corporation of integrated demonstration project pilot project Gong qing smart grid demonstration project 1.5MWp rooftop PV projects access, combined with the actual situation, combined with the ETAP software features of advanced power quality analysis , first proposed using ETAP software for power quality analysis and evaluation of two kinds of access solutions , to establish the model flow calculation example, three different nodes of the short circuit calculation and harmonic calculations for the power sector access system designed to provide a reference.

Abstract: This article focused on the characteristics of the semiconductor laser, designed a practical semiconductor laser driver, which provides two ways of working, including constant current and constant power operating mode. The article focuses on the application of negative feedback theory in semiconductor laser driver design, and done simulation experiments study for constant current drive circuit with simulation software Multisim 10. This driver has soft-start delay protection, preventing electric shock and current limit protection circuits.

Abstract: In this paper, we aim to construct a super integrable discrete soliton hierarchy with self-consistent sources. A new isospectral problem is firstly presented, and we consider a discrete soliton hierarchy with self-consistent sources by using Lie algebra . Then, a new higher dimensional super integrable discrete soliton hierarchy with self-consistent sources is obtained. The method can be generalized to other soliton hierarchy with self-consistent sources.

Abstract: In this paper, we consider a discrete soliton hierarchy with self-consistent sources by using higher-dimensional matrix spectral problem. Then a new discrete soliton hierarchy with self-consistent sources is obtained.

Abstract: Based on the pioneer work of Konishi et al., with consideration of the influence of the synergy effect of ahead-backward vehicles on the traffic flow, we develop a new coupled map car-following model on single road. By applying the control theory, the stability condition of our model is derived. To check the validity of the present theoretical scheme, the numerical simulation is carried out for our model, and it confirms the correctness of the theoretical analysis.

Abstract: In this paper, we give a method for the construction of high dimension nonseparable and compactly supported orthogonal wavelet bases and the method to construct orthogonal wavelet bases are nonseparable . The orthogonal wavelets are associated with dilation 4.

Abstract: In recent years, cloud computing has received much attention from both academia and engineering areas. With more and more companies beginning to provide cloud services, more and more data centers are being built. Recent studies show that the energy consumed by cloud data centers accounts for a large fraction of the total power consumption today. This motivates us to survey power reduction techniques in cloud data centers.