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Because large demand for electricity due to rapid increasing of population growth, using power generation systems renewable energies have widely been studied, and introduction of the power generation systems into many fields such as houses or buildings is accelerating. Essentially, supplying electric power by the renewable energies often becomes unstable because the amount of the electric power depends...
Conference proceedings front matter may contain various advertisements, welcome messages, committee or program information, and other miscellaneous conference information. This may in some cases also include the cover art, table of contents, copyright statements, title-page or half title-pages, blank pages, venue maps or other general information relating to the conference that was part of the original...
The behavioral model of class E amplifiers on the steady-state are given based on the modified nodal analysis (MNA) formulation. The MNA formulation provides circuit equations which are adopted in general purpose circuit simulators such as SPICE. Hence, even though the circuit configuration is changed, the behavioral model can be easily obtained. To produce the behavioral model, the MOSFET including...
In this paper, we analyze stability of the fast-scale and slow-scale dynamics in an interrupted electric circuit. First, we show the full-bridge inverter, as the practical example, in which fast-scale and slow-scale bifurcations are observed. Next, we show our original circuit model and explain its dynamics. Using the sampled data model, we calculate stability of the fastscale and slow-scale dynamics...
Average electric transformers are very hevy because they have iron core, and we usually feel hard to bring the electric transformer. Therefore, lightweight electric transformers are desired. We propose to use an electric transformer which is built by using two spiral inductors. Our transformer is very light, does not have iron loss, and can boost or step down voltage by rotating one of two spiral...
In this paper, a novel voltage-boosting converter is presented, which combines one charge pump and one coupled inductor. The corresponding voltage gain is greater than that of the existing step-up converter combing KY and buck-boost converters. Since the proposed converter possesses one output inductor, the output current is non-pulsating. As a result, both the output current ripple and the output...
Interleaved boost converter with close-coupled inductor is widely employed in drive system for Hybrid Electric Vehicles (HEV) or in renewable energy system, in order to achieve high power density of the converters. For further high power density of magnetic components, this paper presents calculation method for potential power of the magnetic components in interleaved boost chopper circuit with close-coupled...
This paper presents a novel bidirectional DC-DC converter with high conversion ratio for the renewable energy systems. The proposed converter uses the coupled-inductor technique to achieve high conversion ratio. Besides, this converter has simple circuit topology and simple control technique. In the discharging mode, the proposed converter likes two stage boost converters and only needs to control...
A quadratic boost converter topology based on a high conversion ratio dc/dc converter with an active zero-voltage switching (ZVS) snubber circuit is developed for PV system application. Combined with a reboost inductor, a coupled inductor and charge-pump circuits are proposed to achieve high voltage gain with quadratic function. A front inductor is proposed to reboost the voltage gain to make the...
This paper solves the uncertainty of nonlinear system using the backstepping control with sliding function in magnetic ball suspension system. The classical backstepping control is a systematic, methodical recursive nonlinear feedback control method which is fit to design in high order complicated system. A backstepping control and a sliding function are added in design process. The magnetic ball...
This paper reports the experimental results of the load variation characteristics of a magnetically levitated vehicle with hybrid magnets, which we studied in place of street cars and conveyor systems. Magnetically levitated systems have the following advantages: no bearings, no wheels, no noise, no air pollution and low maintenance. We propose new constructive electromagnets and magnetic rails. The...
In this paper, we analyze scaling issues that arise when the size of a magnetically levitated hollow-shaft machine is varied, but the output power is kept constant. Reducing the size by a factor of two leads to a required increase in speed by a factor of about three. Because the losses of previously used topologies did not scale well we suggest and analyze a different topology: the combined homopolar...
This paper presents a linear model for self-sensing electromagnetic levitation system. We consider one degree of freedom magnetic levitation system composed of a suspended object and an electromagnet driven by a pulse-width-modulation amplifier. The proposed model makes use of the airgap information contained in the derivative of the coil current. We design a controller based on the proposed model,...
Fuel cells (FC) suffer with low energy density and hence required to be hybridized with Energy Storage Systems(ESS) like ultra capacitors (UC) or batteries to cater to load profiles that have periodic demands for higher power. Generally converters are connected to each ESS and hence they idle most of the time as they are operated only during peak demands. This paper proposes various operating modes...
In our previous study, it is developed the method to smooth the output power of fuel cells (FCs) by combining with electrical double layer capacitors (EDLCs). This study proposes an energy control method to maintain the voltage of the EDLCs within the specified range and to reduce the fluctuation of the FC output power at the same time, using an additional PI control loop and a digital filter to gradually...
This paper treats the impact of output fluctuations caused by cloud transients on the distribution power systems fed by large photovoltaic (PV) system by considering PHEVs to be main component of future smart grids. The PHEVs charging station is seen as bulk storage battery which acts as controllable loads and interacts with intermittent PV power generation. A control strategy for the PHEVs battery...
From the perspective of global warming suppression and depletion of energy resources, renewable energies, such as the solar collector (SC) and photovoltaic generation (PV), are getting attention in distribution systems. Houses with PV and heat pump (HP) systems are also gaining wide use recently in residential areas recently because of using time-of-use electricity pricing. Thus, optimal scheduling...
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