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Plug-in Hybrid Electric Vehicle
Critical parameter analysis and LQR control for the distribution system with DFIG
In this paper, the modeling of distribution network with Doubly Fed Induction Generator (DFIG) is done in a different way where the resistances of the line are considered. Based on this modeling, this paper presents an analysis to investigate the critical parameters for distribution systems stability where DFIG is used as distributed generation. In order to analyze the critical parameters, the system is linearized about an operating point by using Taylor series expansion method. The critical parameters are investigated through the concept of eigenvalues and participation factors. This paper also shows the graphical output for different states by varying the line resistor. Finally, a Linear Quadratic Regulator (LQR) controller is proposed to improve the parameters disturbances in the distribution network with DFIG.
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The impacts of plug-in hybrid electric vehicles and renewable power penetration into distribution systems
Small renewable distributed generation and plug-in electric cars are new trends on distribution networks which are increasing due to the necessity of providing an increasing amount of energy to match demand in a sustainable way and decrease oil dependence in transportation sector. Those new technologies are related because PEV increasing would facilitate renewable power penetration in distribution systems, leading to better operational conditions including voltage levels improvement, less power losses and the possibility to operate the grid in stand-alone mode. These aspects are investigated in this paper, considering the existence of wind and tidal power generation units and some situations are presented to show the system's operation.
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Optimization of a Contactless Power Transfer System for Electric Vehicles
A contactless charging system based on a circular coil configuration is presented for electric vehicles. An analytical model of the charging system is derived and used to investigate the effect of system dimensions on the system mutual inductance. The efficiency of the system is then calculated and used as a criterion to optimize the dimensions of transmitter and receiver coils in an uncompensated system, as well as series and parallel compensated systems. As a result, several design rules are presented. Following these rules, it is shown that significant improvement in the system efficiency is achieved by optimizing the coil dimensions while the length and weight of coils are kept constant. The performances of the optimized systems are evaluated using the 3-D finite-element method (FEM) and experiments. The FEM and experimental results are in good agreement, confirming the validity of the analytical model and the optimization approach.
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