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In this paper, RDFT(Recursive Discrete Fourier Transform) FLL(Frequency Locked Loop) based on DSC-PLL(Delayed Signal Cancellation Phase Locked Loop) is proposed for coping with frequency variation. This method shows significant performance for detection of fundamental positive sequence component voltage when the grid voltage is polluted by grid harmonics and frequency variation. The frequency tracking...
Flux-switching permanent magnet machines (FSPMMs) have been investigated for hybrid electric vehicles (HEVs). This paper presents an optimal FSPMM with 12 stator poles to meet the minimal performance specifications required by the drive machine in the 2010 Prius HEV. After a qualitative analysis based on size equation to briefly compare performances of FSPMMs with four rotor topology structures, a...
The GTOs are important device in Korean 8200 series electric locomotive because GTOs which are switches of converter and inverter in main conversion power system frequently fail. Also the price of GTOs are very high. So maintenance cost of GTOs has increasing. In this paper, LCC analysis was conducted for GTOs of the main conversion system in 8200 series electric locomotive. In order to LCC analysis,...
This paper deals with the method of a fault detection and diagnostic system for the domain control units and the garnish systems, a vehicle equipped with advanced vehicle E/E systems. The fault detection is a technique for improving the diagnostic coverage of vehicle E/E systems by introducing harsh environments to fault injection in hardware paths and error handling code in software paths. This results...
This paper proposes a single-phase five-level buck-boost inverter with a combination of Z-source network and T-type inverter. The proposed inverter has the following advantages as reducing a number of switches, buck-boost voltage with single-stage conversion and shoot-through immunity. In this paper, operating principle, circuit analysis and PWM control are presented. Simulation and experimental results...
The heating and cooling is very complex process for winding in large power transformer, which involves fluid dynamic, manufacture technology and numerical heat transfer and other related disciplines. Recently, the electromagnetic-Fluid-thermal coupled method and thermal network method are widely used by domestic and foreign researchers, whereas the oil flow distribution can not be taken into account...
The integrated starter generator (ISG) is one of the key components of hybrid electric vehicles. However, with the significant difference in power range between the two operation modes of the starter and generator, it is difficult for the generator to exhibit excellent behaviors in both modes. To solve this problem, a dual air-gap permanent magnet ISG is investigated in this paper. Torque characteristics...
Application of Permanent Magnet Synchronous Motor (PMSM) has been increasingly popular in Electric Vehicle (EV) area since cost-effective magnetic materials were recently discovered. This paper mainly presents numerical calculation and experimental measurement of core loss of PMSM at various frequencies among 50Hz, 100Hz, 200Hz and 400Hz. A novel design strategy of PMSM will be described. The motor...
Temperature rise is one of the main factors that affect the safe operation of electric vehicle. In order to improve the heat efficiency of the motor, the water-cooled motor of circular circumferential waterway for mini electric vehicle was studied as an object in this research, the structural parameters of the channel are optimized and analyzed from the following aspects: the width of the adjacent...
The technique of both the electric lightings and the electric vehicles have been more and more grown and the power consumption is very important part. This paper presents a phase shift full bridge(PSFB) converter with the zero-voltage-switching range expansion. In addition, the proposed converter provides both good efficiency and low switching device noise. The experimental and simulation results...
The evaporative cooling system for wind power generator inclines at an angle of 3∼5 degrees. Due to the special structure, it forms a liquid-gas two-phase self-circulation. Two-phase flow self-circulating system is a typical nonlinear dynamic system. So it is important to study the nonlinear characteristics. In this paper, the nonlinear characteristics were studied through theoretical analysis and...
The maintenance cost of 8200 series electric locomotive operating in Korea is rising due to aging and lack of original technology. 8200 series electric locomotive have two auxiliary power systems. The auxiliary power system supplies power to the passenger cars. So it is related to the safety and reliability. There are many parts of the auxiliary power system. Among that, The PWM modules are very important...
The position and speed detection of maglev train is critical to train control system. The common methods of speed measurement include speed sensor measurement and speed sensorless measurement. The use of sensorless method can significantly reduce costs and it's not influenced by various environmental factors. In this paper, a high frequency pulsating voltage injection method is proposed for the PMLSM,...
We constructed a charge and discharge system for effective utilization of an electric storage device composed of batteries. We verified the system operation by simulation analysis and actual measurement. The simulation analysis showed that it is useful to alternately use two secondary batteries as the lithium ion battery (LIB). From the measurement of 60 cycles, the use of secondary batteries under...
A teaching example is built in Simulink, and then, based on the communication between Matlab and LabVIEW, a teaching virtual platform in LabVIEW is realized. This platform is about a wind power generation system and used mainly for the Renewable Energy Sources course of the undergraduate students of electrical engineering major. Compared with Simulink simulation teaching, the virtual platform adopts...
In order to reduce the torque ripple and improve the torque-speed characteristic of switched reluctance motor, a novel predictive current control method is proposed in this paper. Compared with conventional current hysteresis control, the current tracing ability is improved by using proposed method without increasing switch frequency or changing hysteresis band. Both of torque ripples and copper loss...
As the use of electric energy increases rapidly due to the development of the worldwide industry, The ESS is attracting much attention in terms of efficient energy use. The ESS consists of various components such as battery, BMS, PCS and PMS. And PCS is the largest weight and volume among these components. The reasons are that the reactor for the high-frequency filter and the isolation transformer...
With the rapid increase of the substation grade, the number of ultra-high voltage (UHV) transformer is increasing and the noise caused by the vibration of UHV transformer is becoming more and more serious. The vibration of UHV transformer is mainly generated from the magnetostrictive effect of the iron core and the action of the electromagnetic force of the winding. In this paper, the sound intensity...
A new approach for the computation of electric fields is described, based on the response surface methodology(RSM) and geometric feature charge simulation method (GFCSM). And the novel combination of RSM and GFCSM is applied to calculate the electric field of the high voltage SF6 arc quenching chamber in this paper. The electric field distribution with higher calculation precision has been achieved...
Spray cooling is a new type of high heat flux heat transfer cooling technology. In the process, cooling medium is dispersed certain microscale droplets through the nozzles and injected to the stator core and winding. The spray characteristics will affect directly the heat transfer coefficient. So in the paper a test rig using a nozzle was constructed to explore the atomization characteristics of spray...
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