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In order to accommodate increasing energy demand from "more electrified" domestic and vehicular applications, simultaneous use of various renewable sources are encouraged. Multiple converters are commonly adopted to process the renewable power as a distributed power system (DPS). However, due to the loose structure of DPS, reliability and load/source regulation will degrade as compared to...
The following topics are dealt with: DC-AC converters; DC-DC converters; adjustable speed motor drive control; fuel cell systems; energy storage systems; lighting systems; power electronics; renewable energy harvesting; power quality enhancement; fault management; passive components; soft switched power converters; inverters; and vehicular electronics.
A transformerless microinverter is described that is intended for integration into building materials such as residential roof shingles. The inverter achieves low profile (3 mm), high efficiency (95.1%) and high reliability capacitive energy storage using 125degC ceramics. It is intended to interface a 25 W photovoltaic array such as a small thin-film residential roof shingle to the 120 V AC utility...
In this paper, two novel control strategies are designed and evaluated for a bidirectional DC/DC converter and a 3-stage parallel-interleaved bidirectional converter, for hybrid electric vehicle (HEV) energy storage applications. The energy storage system (ESS) combines 2 parallel ultra-capacitor (UC) modules with a bidirectional DC/DC converter, a Lithium-Ion (Li-ion) battery module, and a load module...
Batteries are a common element used in many electronic applications. Therefore, the analysis and simulation of these applications requires a battery model in order to validate the behavior of the whole system. Since batteries are based on different technologies, a modeling approach valid for any technology is a potential good alternative. Since there are similarities among the different technologies,...
This paper examines the technology and value proposition for the active combination of the power dense ultracapacitor with an energy optimized lithium-ion battery. Aspects of the respective technologies that can be altered for the benefit of the active parallel energy storage system are noted. Energy management control strategies are investigated that show promise for dramatic reduction in lithium-ion...
This paper presents detailed design and comparison of two front-end Dc/Dc converters which are suitable especially for the medium-power level applications with low output voltage and high output current both. Where, the LLC resonant converter drawn more and more attention recently shows its essential advantages in high conversion efficiency and high power density. However, due to the variable-frequency...
Energy storage requirements for converters with a dc port and a single-phase grid-connected port are evaluated, based on the unavoidable double-frequency power requirement. The minimum energy storage requirement is linked to a minimum capacitance requirement for converters that use capacitance energy storage. It is shown how to employ a ripple power port to manage energy storage and decouple capacitor...
It is well known that there exist second-order harmonic current and corresponding ripple voltage on dc bus for single phase PWM rectifiers. The low frequency harmonic current is normally filtered using a bulk capacitor in the bus which results in low power density. This paper studies the energy storage capacitor reduction methods for single phase rectifiers. The minimum ripple energy storage requirement...
In order to increment gas mileage and meet CO2 emission targets, automakers have recently started making serious advances towards all-electric and plug-in hybrid electric vehicles (PHEV). Since the last decade, the main obstacle has remained the same: energy storage. In recent years, lithium batteries have been vastly explored, but have not yet met the energy requirements for PHEVs. The main issues...
A method of maintaining high power-conversion efficiency across the entire load range and its circuit implementations are described. The proposed method substantially increases the conversion efficiency at light loads by minimizing switching and driving losses of semiconductor switches, as well as core losses of magnetic components. These losses are minimized by periodically turning off and on the...
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