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In this paper, a 500 W, 400 V to 48 wireless power transfer system for vehicle battery charging is analyzed, designed and implemented. Series-series resonant topology is used due to ease of analyze and control. The secondary bridge rectifier is replaced by a sync rectifier consists of four MOSFET in a full bridge configuration in order to reduce conduction losses on rectifier. An efficiency of 92...
Each year, the highest costs in Telecom network shelters and cabinets are not related to personnel or construction, but to energy consumption. The highest proportion of energy costs derive from the energy consumption of electronics cooling units, which run around the clock to ensure well-balanced running temperatures for the enclosed electronic equipment. Technologies designed to reduce energy emissions...
This paper presents a control approach for a current driven Dual Active Bridge (DAB) converter used as an interface to transfer power between the grid and Electric Vehicles (EVs). The wide range of input voltage and load variation makes it very challenging to have a fast control response of power flow between the two dc buses. This control system adaptively regulates the frequency and the phase shift...
A single-stage ac-dc converter consisting of full-bridge converter is proposed for EV charger applications. The proposed approach is superior to conventional two-stage ac-dc converter widely used for EV charger applications. The two stage ac-dc converter is apt to be costly and large. However a single-stage ac-dc converter is suitable to a low cost, small volume due to a reduced number of components...
In this paper, the efficiency limits of power electronic converters are investigated from a semiconductor point of view. The approach is presented on the example of a hard switching half bridge while taking Si, SiC and GaN devices into account. Beside parasitic effects of the semiconductors itself, further converter non-idealities and limits from a thermal point of view are discussed. All in all,...
The facility cost of the storage systems are a critical issue in the construction of micro grid, which is the core of the renewable energy. We propose the direct current mutual power interchange system as a way to reduce the storage battery capacity. This paper reports the outline of the proposed system and the verified result on the effect caused by electricity interchange upon the reduction of battery...
Mashhad Electric Energy Distribution Company (MEEDC) has designed and implemented the first local micro-grid in Mashhad which is called “MehrSun”. This article presents the performance analysis and result assessment of Mehrsun after working for one year. Different micro-grid elements and the connections with local power network are explained and the level of home automation which is implemented for...
Energy storage system is used in power-grid to compensate for the power fluctuation caused by renewable energy systems. This paper presents loss-analysis results of power converter utilized for the energy-storage systems. The system has multiple energy storage devices such as a LaB and an EDLC. This paper discusses two methods to distribute the compensation power reference to each device. Conventional...
This paper presents an experimental study with a pilot hybrid microgrid system that is proposed and implemented in Tagajo campus of Tohoku Gakuin University, Japan. The developed microgrid system is designed to be able to supply power to both DC and AC loads simultaneously by renewable power sources such as PV and wind power generations, etc. Meanwhile, in case that the renewable power is insufficient...
Droop Control has been a well-established control technique both in AC and DC power distribution grids for many years, because it provides a simple way to equally distribute the load current between remote power sources. With the increasing demand for low voltage DC microgrids supplying high-reliability equipment, like servers in data centers, to work both grid-tied and autonomously without a connection...
This paper studies the dynamics of the proposed vibration energy harvester to develop the method of designs and controls for the system. The harvester converts vibrational energy into electrical energy through rotational motion of a mechanical pendulum or a so-called parametric pendulum. The rotation is maintained for periodic vibration with appropriate amplitude and frequency. However, such appropriate...
The battery imbalance which exists in the Lithium-ion battery system of electric vehicles, evidently decreases the total storage capacity and the whole life of batteries. To solve this problem, a modularized battery equalizer is proposed in this paper. Using multiple transformers which have two secondary windings, the modularization of battery equalizer and the energy transfer are achieved. In order...
This study deals with an interesting approach that clearly evaluates the noise reduction in noise-containing experimental discharging/charging voltage signal (DCVS) based on the discrete wavelet transform (DWT) and the wavelet packet transform (WPT). The key difference to be considered is the multi-resolution analysis (MRA)-based decomposition ability of high frequency band. By comparison with the...
Active damping of grid-connected LCL filter resonance by means of an observer loop to estimate the capacitor current is a well-known method. However, with variation of the grid side inductance due to grid conditions, the system robustness has to be checked. This work discusses the effect of the observer design on the system robustness against grid side inductance variation. Different values of resonant...
In Japan, the liberalization of the electricity retail market is starting in April 2016. Consumers will be able to choose the retail electric suppliers from which to buy. In Germany which domestic electricity market was fully liberalized in 1998, Stadt Werke (local power companies) has maintained more than 20% of the retail electric market share. We studied the feasibility of a regional energy business...
This paper looks at multiple energy sources now available at the cell site, as well as design and management complexities that have risen as a result. The goal of this paper is to outline design considerations for each alternative energy source, such as technologies, logistics, setup and operation. By showing these considerations, decision-makers can refine objectives for deployment and operation,...
This paper introduces extension of concept of discrete control method of class E amplifier to the varying load reactance. Previous discrete control method could keep nominal operation of the class E amplifier for varying load resistance. But, it could not apply for the varying load reactance. In this paper, with varying shunt capacitance and output resonant capacitance, discrete control which keeps...
In view of the emerging demand for longer-term industrial or second life of lithium-ion batteries, aging effect(s) should be seriously considered to understand all potential safety risks behind those applications. In this study, four categories of critical aging effect(s), including degradation of construction integrity, self-heating effect, decay of thermal stability and failure in key components,...
Three phase PFC rectifier followed by a DC-DC isolated converter has been the industry workhorse for conversion of three phase AC to isolated DC output used for high power (> 3kW) telecom loads. In this paper a reduced device count nine-switch converter topology which integrates the two stages of a conventional three phase AC-DC power supply with an isolated DC output voltage for telecom applications...
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