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In this paper, an on-board charger for electric vehicle, with two-stage power converter, is designed. Firstly, a single-phase Boost-APFC (Active Power Factor Correction) circuit controlled by a one-cycle controller is designed as the front state converter. Compared to the traditional APFC circuit, the One-cycle controller is constructed without considering the multiplier and AC line voltage sensing...
Although the precision of existing calculation methods of the dynamic security region can reach a high level, the heavy calculation and large time-consuming become the bottleneck of its online application. Based on the fact that fault location can affect the transfer of boundary hyper-plane, a method of real-time DSR rapid calculation - the angle uniform rotation method is proposed. By calculating...
The layer numbers and the density of circuit wiring increase day by day to meet the demand of the multifunction and miniaturization of electronic products during the manufacturing of printed circuit boards (PCBs). The dimensional stability of films determines the size and the alignment accuracy of images in each layer. This paper mainly discusses two aspects of silver halide films, the changing regularity...
Multiphase machines have higher reliability than 3-phase machines. In order to produce smooth torque after one or more phases are open circuit, the stator magnetic motive force (MMF) is kept unchanged. This paper presents fault-tolerant current control strategies of a concentrated winding multiphase machine under open-circuited fault conditions. In a concentrated winding multiphase machine, other...
Resource allocation in grid environment is a complex undertaking due to the heterogeneity and dynamic nature aroused by wide area sharing. To address the heterogeneous and computationally intractable problem of resource allocation optimization in grid, this paper presents an allocation algorithm for parallel tasks based on particle swarm optimization. The heterogeneity of grid user is tackled by introducing...
The precision of the voltage phase angle measured by the PMU (Phasor Measurement Unit) can well meet the need of power system analysis and control. A new controller is proposed for power system stability, which can linearize its nonlinear state equations by online tracking of the state variable with the help of PMU, and complete an objective control strategy that forces the system state into a desired...
Based on GPS technology, a new algebra equation method (AEM) of live line measuring the parameters of transmission lines with mutual inductance is proposed. The mathematical model of the new method is explained in detail. The hardware structure of the live line measuring system based on GPS is given. Digital simulation results are shown. Finally, an example of live line measuring six 500-kV transmission...
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