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EDLCs offer high energy density and long life span, so various applications may be anticipated in the realm of energy storage devices, such as those used in electric vehicles or electric power stabilization in power systems, etc. However, since the voltage limit is low of the devices, it is necessary to connect them in series or parallel. In addition, it is required that they be used in the region...
DC-DC converters of hybrid vehicles and electric vehicles are required to become smaller and lighter for building roomy and light weight EV. High-frequency switching can be used to miniaturize DC-DC converter. However, the influence of the skin effect and the eddy current become large. Parallel operation of converter is often for current applications using multiple winding transformers in order to...
In this paper, it was proposed to the optimization of skew of SPMSM with 3-dimensional finite element method (3D-FEM). The optimization technique was used multi-step parallel Genetic Algorithm (GA) and the allocation of material assignment method. As a result, in useful computation time, It was able to obtain an optimal skew special shape. And, it was able to reduce the cogging torque of more than...
Large energy-saving effect can be expected for air conditioners that occupy the highest power consumption rate of home appliance, by introducing the SiC. In this paper, the transition of power devices, the characteristics, and the issues in widespread use, and foresight of the next generation power devices, SiC, are reported.
Optimal techniques for power supply with transient current circuit are introduced in this paper. The circuit reduces switching loss of buck converter's main switch effectively. However, in our previous researches, it could be operated with high efficiency only at heavy loading. The techniques to get rid of this disadvantage are proposed and the validity of it is verified through experiments.
This paper provides a comparison of high power semiconductor devices in 5MW-class Permanent Magnet Synchronous Generator (PMSG) Medium Voltage (MV) wind turbines. High power semiconductor devices of press-pack type IGCT, module type IGBT, press-pack type IEGT, and press-pack type IGBT of both 4.5kV and 6.5kV are considered in this paper. Benchmarking is performed based on neutral point clamped 3-level...
An unexpected and instantaneous voltage sag in the energy storage system (ESS) application may cause irrespective breakdown and permanent internal damage of ESS. Therefore, this paper gives insight to the design and implementation of a novel methodology based on the application of discrete wavelet transform (DWT) to the fault diagnosis of the LiFePO4 ESS application using discharging/charging voltage...
Nanogrids are small residential power systems with renewable sources, storage, and domestic loads. It may or may not have connectivity to utility grid. This paper discusses the role of advanced converter technology for Nanogrids in solving acute power shortage problem in Rural India. The paper is divided into two sections. In the first section, the advances in Nanogrid converter technology are discussed...
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