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The exigencies created by the shortage of energy supplies and the ever-growing air pollution stress the need for an alternative solution to the on-board power generation. The purpose of this paper is to develop a novel switched reluctance wind power generator (SRWPG) system for electric vehicles (EVs), which can convert the wind power into electric power so as to charge a battery or support other...
This paper presents the configuration of a prototype induction cooker. Effective control scheme is incorporated in the voltage-fed H-bridge series resonant converter, which is based on an auto-frequency tracking strategy. The proposed control strategy ensures stable operation characteristics of overall converter system and ZVS (zero voltage switching) operation as well as power regulation. The operation...
To face the challenge of possible global warming, the governments of developed countries around the world try to cut their carbon emissions by promoting the use of energy efficient appliances such that the standard of living of their people could be maintained with less overall energy consumption . One of their moves is to replace inefficient incandescent lamps with compact fluorescent lamps (CFL)...
Different cases of the headlight design has been made for the front-lighting system. The design under pitch control, various obstacle location, control of high and low beam are described. The motion control of the front-lighting system is also discussed. It has found that the stepper motor is preferable than DC motor because of the dynamic performance, cost and the control.
Doubly-fed induction generator (DFIG) is the most common type of generators for wind power generation, because of their high energy yield and the possibility of generating power at variable speeds. For most papers in literature, only the synchronization and power generation of DFIGs, but not the transition between them, are discussed. This paper presents a method to control the transition of DFIGs...
Electric vehicles will arrive for everyone to use in Hong Kong within a year. But, a well thought out plan with good policy must be established now, before these cars gets manufactured and start driving around. The issues of standard charge points or standard plugs and standard battery packs must be review with all stakeholders as soon as possible.
In order to cut down air-condition energy consumption in the communication room and reduce the heat island effect partially, through the use of CFD (computational fluid dynamics), we have a study on airflow characteristics in communication engine-room. On the basis of established mathematical and physical equation about airflow characteristics, we try to get the numerical solution, and analyze the...
Brushless doubly-fed machine (BDFM) has two sets of winding on the stator, the power winding connect with constant frequency constant voltage three-phase power frequency electrical source ,the controlled winding connect with the matrix converter (MC). MC possess the capability of bi-directional power flow, can simultaneously provide sinusoidal input current and output voltage. The phase of input current...
This paper is to find out the alternative method to compensate a Xenon lamp near the end of its life time. In the past, the lamp will be disposed if an effective intensity cannot be obtained. The proposed study is to provide a compensation method that, based on the measured characteristics of general Xenon lamps, and to calculate the required compensation power and to extend the constant illumination...
In this paper, inductance of an in-wheel switched reluctance motor (SRM) would be computed by using the MEGA software. MEGA, a computer simulation program that model the electromagnetic devices, solves the low frequency subset of Maxwell's equations using finite element method (FEM). Magnetic field strength would be computed in accordance with the SRM specifications. With different values of current...
Adaptive front lighting system becomes more and more popular today. Not only in combustion engine vehicles, but also in some of those new model electric vehicles. Since the new head lamp control system contains several components including drives and controls. Any error on design may affect the overall performance of the system. The simulation of the auto-levelling control system is very important...
A total of 12 models in linear quadratic, cubic, exponential and power forms using only sunshine hours, latitude, and altitude were developed and compared to estimate the daily global solar radiation on a horizontal surface for 6 weather stations at plateaus zone, China. The models were compared on the basis of statistical error tests using the root mean square error (RMSE), mean bias error (MBE),...
Magnetic levitation systems are contactless type, there are no mechanical components between the translator and the stator. Hence, it can eliminate the mechanical wear, friction, noise, heat generation, and metal dust, satisfy environmental demand, and enable the system to move at high speed. Although the magnetic levitation systems have vast potential in engineering applications because of the above...
Energy factor proposed as a goodness factor for DC system is reviewed in this paper. More general definitions of energy storage and energy factor are presented based on the analysis of energy process. By these new definitions, energy factor and energy storage can be extended into AC system. They can be used to compare the performance of different topologies of DC converters. The investigation of transformer's...
Power electronics devices are generating heat losses up to several hundreds of Watt/cm2. Chip shrinking causes a steady increase of heat to be dissipated. Intelligent solutions must be developed for better heat conduction from the chip to the ambient. The reduction of the thermal resistance of power modules is one of the challenges for the future. Decreasing the thermal resistance of the ceramic by...
This paper presents a dynamic hysteresis current control for a three-phase four-leg voltage source inverter topology. In order to improve the performance and life of the power switches of voltage source inverter, we require an optimized control technique which reduces its switching frequency. Proposed hysteresis current control method is a generalized control method which minimizes switching operations...
A vehicle is consider Green when it more environmentally friendly than the traditional petroleum combustion engine, in which includes any nontraditional vehicle like, HEV, Plug In, EV, Fuel Cell, Bio fuel etc. that improves fuel economy. The development of electric vehicle has been over a hundred years but failure to gain the public acceptance in various stages due to various reasons which explained...
This paper presents an introduction to hybrid electric vehicles, the commonly used configurations of the driving chains, the comparisons among these configurations, and then finally the possible developments of hybrid electric vehicles in the near further. Plug-in hybrid electric vehicles are also included in the discussion.
Active power filter is an advanced power electronic device, which can be used for integrated compensating harmonics and improving power quality. A shunt active power filter using for three-phase four-wire system is introduced in this paper. The basic operation principles and structure are analyzed. This paper proposes the design of a shunt active power filter, which can be used under the condition...
The concept and sorts of motion controller were introduced in this paper, the features of PMAC motion controller was explained, and the make-up of the numerical control system based on MINI-PMAC, PC and AC servo driver was discussed in detail including hardware structure and software designing. Then a development example of experiment was shown. Servo compute and control in the CNC system are both...
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