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A new method of current balance compensation based on SVG and V/v transformer is proposed to solve the problem of three-phase side current asymmetry caused by traction power supply system of electrified railway. The conditions for elimination of negative sequence current are analyzed. In this compensation system, a total of three single-phase voltage source inverters of SVG are respectively connected...
This paper based on the commutation mechanism of series capacitor commutated converter (CCC), the CCC is applied to UHVDC transmission system, and the mathematical model of reactive power demand of CCC inverter is established. According to the actual parameters of Jiuquan-Hunan ±800 kV UHVDC transmission project, the simulation model of CCC- UHVDC system is built by PSCAD/EMTDC simulation software...
The problem of non-fragile pinning synchronization for complex networks is studied in this paper. Firstly, by using an inequality, which is introduced by using Newton-Leibniz formula, synchronization criterion is obtained by using novel mathematical skills. Secondly, a novel variable subintervals method is applied to expand the former results. Unlike previous results, the interval delay is divided...
The behavior analysis of animal has a key role in biology and robotics. In this paper, we choose the rat as analysis object. For understanding and grasping the behavior of rat, we set up an automatic motion tracking and data analysis system for a rat. This system includes three subsystems: inertial data acquisition, image tracking and real-time data analysis. The inertial subsystem uses one CC2530...
In order to satisfy the demands of stabilized control for airborne platform mounted on multi-rotor Unmanned Aerial Vehicle (mUAV), a fuzzy adaptive PID hybrid control strategy with a fuzzy switching condition is put forward, and the control structure has dual rate-speed loops. After the analyzed the anti-disturbance ability of control structure deeply, the self-adjusting factor and the self-learning...
This paper proposed a wye-delta multi-function balance transformer based power quality control system (MBT-PQCS) to deal with the power quality problems in the singlephase power supply system. MBT-PQCS is mainly consists of a wye-delta multi-function balance transformer (YD-MFBT) and a three-phase full-bridge converter (FBC). It fully explores the inherent negative sequence current (NSC) suppressing...
Through the analysis of a five-ton loader working condition characteristics, this paper proposed a parallel hybrid loader structure, studied its parameter matching and put forward a fuzzy logic control strategy for energy saving. The input variables of fuzzy logic controller were system demand torque obtained by online estimation and state of charge of super capacitor. After fuzzy control optimization...
This paper presents a new phase shifting transformer which is applied in multipulse diode/SCR rectifiers. Comparison of operational characteristics of a conventional phase shifting transformer and the proposed transformer was studied. Results show that the new phase shifting transformer can not only reduce greatly the harmonics of the grid side currents, grid side voltages and the load side voltages,...
deeply analyzing the harmonic transfer model and methods of harmonic suppression, pointed out that the object of harmonic suppression is consistent with the definition of equivalent power conductance which found in FBD (Fryze-Buchholz-Dpenbrock, FBD) method. By adopting rapidly RMS (root mean square, RMS) detection method which based on the sliding-window iterative algorithm, an improved FBD method,...
As a part of communication, cultural differences affect business negotiation deeply. In a globalizing world today, with international business happened frequently, cultural differences bring influence to communication, any misunderstanding of it may directly affect the business. Therefore, it makes sense for the countries of different cultural backgrounds to understand each other. With the entry into...
The new converter transformer and harmonic suppression scheme Filter Commutated Converter (FCC) has a unique connection mode. It is very hard to establish the coupled circuit mathematical model when the FCC only contains unaccompanied voltage sources or voltage controlled voltage sources (VCVSs), because some of their elements have no branch admittances or the impedances equals to zero. However the...
In order to enhance tank tactical training in Distributed Virtual Environment (DVE), an Intelligent Tutoring System (ITS) is developed and provides real-time automatic coaching. The ITS is designed according to pedagogy of scaffolding. The coaching fades out gradually while the trainee making progress. The coaching content depends not only on previous performance, but also on current performance....
This article helps to clarify and articulate the ideological, legal, and ethical attitudes regarding software as intellectual property rights (IPRs). Computer software can be viewed as IPRs from both ethical and legal perspectives. In China, IPRs protection legislation has carried on at a speed never before known, but in judicial practice, there are still a lot of issues worth exploring in software...
A multi-purpose balanced (MPB) transformer is proposed in this paper for electric railway applications. The MPB transformer is developed from impedance-matching (IM) transformers widely used in Chinapsilas railway systems. The proposed MPB transformer has three main functions: (1) it provides a symmetrical two-phase voltage of 27.5 kV for railway overhead lines to power electric trains, (2) it supplies...
Wind power generation has been considered as a generally accepted utility technology in renewable energy generation around the world. China's government recently paid great attention and pushed hard on with the renewable energy and its applications. This paper provides an overall perspective of the development and trend of wind power in China. The potential resources of wind power and the current...
Because the facilities structures and relations in discrete manufacturing enterprise are very complex, the facility layout method only relying on the experience and the technology of traditional systematic layout planning (SLP) is very difficult to meet increasing demands of this kind of enterprise. In this paper, the advantages and shortcomings of SLP are analyzed, and the character of logistics...
Recently, the impedance-based damage detection technique has been developed as a promising tool for real-time structural damage assessments. The basic concept of this method is using the electromechanical coupling property, in which the electrical impedance of piezoelectric materials is directly related to the mechanical impedance of the host structure. Through detection the measured electrical impedance...
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