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Power Electronics and Drive Systems (PEDS), 2013 IEEE 10th International Conference on

Date 22-25 April 2013

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Displaying Results 1 - 25 of 252
  • [Front matter]

    Page(s): 1 - 118
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    Freely Available from IEEE
  • Table of contents

    Page(s): 1 - 58
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    Freely Available from IEEE
  • Neural networks approach for wind-solar energy system with complex networks

    Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2568 KB) |  | HTML iconHTML  

    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 on the weather conditions. Then, we need to introduce a sophisticated control method to maintain supply systems stably. From this view point, M. E. Gamez et al. proposed an optimal control method using recurrent neural networks for a wind solar power energy generation system. In the conventional control method, the optimization problems for the wind solar energy power generation system are regarded as the linear programming problems, and they solved the problems by the recurrent neural networks. Then, results indicate that the control method has much possibility to apply into the real power generation systems. However, only small sizes of the systems are evaluated for the control method. Then, we evaluate the control method using more realistic power generation systems using the complex network theory in this paper. In this model, the wind solar power generation systems are connected by electric power lines. From the results of the numerical simulations, the control method with the recurrent neural networks exhibits good performance even if more realistic conditions are introduced. View full abstract»

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  • Behavioral modeling of class E amplifiers based on modified nodal analysis formulation

    Page(s): 6 - 11
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    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 the class E amplifier is replaced with an ideal switch. Each dynamical system depending on "on" and "off" states of the switch is categorized into the predictor system in control theory. Thus, the behavioral model of the class E amplifiers is obtained based on control theory. View full abstract»

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  • Stability analysis of an interrupted circuit with fast-scale and slow-scale bifurcations

    Page(s): 12 - 15
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    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 fast-scale and slow-scale dynamics. Finally, we mathematically show that the period-doubling bifurcation, which occurs in the fast-scale dynamics, does not directly affect the stability of the slow-scale dynamics. View full abstract»

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  • Voltage converter by using printed distortion spiral inductors

    Page(s): 16 - 20
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    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 inductors. View full abstract»

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  • Applying coupled inductor to step-up converter combining KY and buck-boost converters

    Page(s): 21 - 25
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (481 KB) |  | HTML iconHTML  

    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 voltage ripple can be reduced significantly. After some mathematical deductions, an experimental setup with 12V input voltage, 72V output voltage, and 60W output power is used to verify the effectiveness of the proposed converter. View full abstract»

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  • Potential power analysis and evaluation for interleaved boost converter with close-coupled inductor

    Page(s): 26 - 31
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    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 inductor. The calculation method for potential power of magnetic components is based on detailed analysis of the characteristic of inductor current and magnetic flux in the core. By applying the method, more easily, design of magnetic components in high power converters. As a result of analysis of potential power, CRM control scheme is effective for miniaturization of the magnetic components in case of interleaved boost converter with close-coupled inductor. Finally, potential power of the interleaved boost converter with close-coupled inductor is discussed from theoretical and experimental results. In this paper, “potential power” means allowable power of inductor. View full abstract»

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  • Analysis and implementation of a bidirectional double-boost DC-DC converter

    Page(s): 32 - 37
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (790 KB) |  | HTML iconHTML  

    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 one active switch that can achieve high voltage step-up ratio conversion. When the charging mode, it likes two buck converters in cascaded, and the active switches are operated in the same duty cycle that can achieve high voltage step-down ratio conversion. This paper has analyzed the proposed converter operating principles, steady-state circuit characteristics. Eventually, a prototype circuit with conversion voltage 24 V/ 200 V and output power 200 W is implemented to verify the feasibility of the proposed converter. The maximum efficiency is about 94.3 % and 91.6% at discharging and charging mode respectively. View full abstract»

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  • Quadratic boost converter with switched capacitor and coupled inductor for PV system applications

    Page(s): 38 - 43
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    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 output voltage higher. The converter operating principle of the proposed conversion scheme is described in the detailed converter analysis. Simulation and experimental results are used to verify and validate the performance of the quadratic boost converter with the fuzzy maximum power point tracking controller (MPPT) in the PV inverter system. View full abstract»

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  • Integral backstepping sliding mode control of a magnetic ball suspension system

    Page(s): 44 - 49
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (508 KB) |  | HTML iconHTML  

    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 suspension system is employed to validate the proposed controller. The experimental results show that the integral backstepping sliding mode controller is successful solving both the uncertainty of nonlinear system and the steady error of classical backstepping control method. View full abstract»

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  • Load variation characteristic of magnetically levitated vehicle with hybrid magnets

    Page(s): 50 - 53
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    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 magnetically levitated part must be cordless and the power source has involve Ni-MH AA size rechargeable batteries. As a experimental result, the number of dry cell batteries is increased with increasing load. View full abstract»

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  • Scaling of magnetically levitated homopolar hollow-shaft machines

    Page(s): 54 - 59
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    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 magnetic bearing (CHB). The proposed design methodology has been experimentally verified in a prototype product. View full abstract»

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  • Self-sensing electromagnetic levitation system taking account of ripple currents excited by PWM amplifier

    Page(s): 60 - 64
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    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, and show that the system performs well by using computer simulation. View full abstract»

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  • Investigation of various operating modes of fuelcell/ultracapacitor/multiple converter based hybrid system

    Page(s): 65 - 71
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    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 which the converters can be used in interleaved or isolated configurations upon predetermined load demand patterns. This paper analyses various operating modes and proposes control strategy to utilize the converters effectively. A multi objective energy and power management algorithm is derived based on predicted/predefined load pattern to meet tight load regulation, operate fuel cells at MPPT, regeneration and protect fuel cell from starvation. The merits of the proposed configuration are illustrated through theoretical and experimental investigation. View full abstract»

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  • Energy control method for fuel cell-electric double layer capacitor hybrid power source system

    Page(s): 72 - 77
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    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 vary the reference value of the FC voltage. The control parameter is determined using the simplified numerical model that is also constructed. The simulation result obtained from the model that used the determined control values showed that the system works stable and the movement of the operating point of the FC is controlled under the load condition where the duty ratio of the square-wave load current is changed. Finally, in consideration of vehicle applications, simulations using the large scale model is demonstrated and its results are evaluated. View full abstract»

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  • Supersession of large penetration photovoltaic power transients using storage batteries

    Page(s): 78 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (738 KB) |  | HTML iconHTML  

    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 is developed in which the PV generation scheduled power is prepared based on clear sky assumption. In normal state, the storage batteries are set in charging mode. The results simulate the impact of 50% PV penetration on a 33-node radial distribution feeder during 24 hour period. PV generation plants were connected at buses 18 and 33 which display weakest voltages. The simulations are carried out for clear sky, full cloudy sky and cloud transient with different models of the PV interface inverter. The results show that the generating reactive power by PV inverter enhances the feeder voltage profiles. However, during cloud transient, application of PHEVs storage systems is required to alleviate the feeder voltage flicker. PHEVs charging stations were connected at the same buses of PV generation plants. The developed controllers can be integrated with charging station smart meter and can be extended for real time billing schemes in both charging and discharging modes. View full abstract»

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  • Optimal scheduling method of controllable loads in smart house considering forecast error

    Page(s): 84 - 89
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (614 KB) |  | HTML iconHTML  

    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 of the distributed energy resources (DER) is required to reduces the operational cost for the consumers, however DERs of then deviate from forecast data. Hence, optimal scheduling of these appliances may not be achieved due to uncertainty of the weather. In this paper, we propose an optimal scheduling method of controllable loads considering forecast error in the smart house, where HP, fixed battery and EV systems are used as controllable loads. The scenario based approach is applied in roder to solve the optimization problem involving the uncertainty. Furthermore, a novel electricity pricing system is also suggested in this paper. In order to confirm the proposed method is useful, and in to verify the effectiveness of the proposed system, MATLAB® is used for simulations. View full abstract»

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  • Leakage current suppression in the variable capacitance device for the use in AC power converters

    Page(s): 90 - 95
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    Ac leakage current in the Variable Capacitance Device is discussed. For varying the capacitance, this device utilizes nonlinear characteristics of dielectric. Therefore, the ac leakage current flows from the capacitor to a dc control voltage source when ac capacitor voltage is high. Here, techniques for suppressing ac leakage current are proposed. An example of its application is introduced about ac power supply. Influence of leakage current on distortion in current waveforms is also investigated. View full abstract»

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  • GaN HEMTs power module package design and performance evaluation

    Page(s): 96 - 98
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    This paper described the electronic performance of power module packaged high-power AlGaN/GaN high electron mobility transistors (HEMTs) on silicon substrate. Twelve GaN HEMTs chips are mounted on AlN substrate. Each device is wire-bonded in parallel connection to increase the power rating. Both DC and pulsed current-voltage (ID-VDS) characteristics are measured with different connection and sizes of devices, at various power densities, pulse lengths, and duty factors. The packaged GaN HEMTs exhibit the pulsed drain current, 0.43 A/mm. The performance of packaged multichip GaN HEMTs power module is studied. The GaN HEMTs power module exhibit a drain current of 23.04 A, which indicates that connecting GaN HEMTs devices in parallel can effectively increase the drain current. View full abstract»

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  • Differential mode EMI filter design for ultra high efficiency partial parallel isolated full-bridge boost converter

    Page(s): 99 - 103
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    This paper presents a practical method to design a Differential Mode EMI filter for fuel cell powered isolated full bridge dc-dc boost converter. As the input voltage of such converter is inherently low with very high dc and ripple currents and since the EMI limits also does not change for such application, it calls for a carefully optimized EMI filter which is designed and implemented in this work. Moreover, the negative input impedance of the regulated converter is extremely low; well-designed filter damping branch is also included. Differential mode noise is analyzed analytically for a 3KW/400V boost converter. Simulation and experimental results are recorded and published. View full abstract»

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  • A VLLMS based harmonic estimation of distorted power system signals and Hybrid Active Power Filter design

    Page(s): 104 - 108
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    This paper presents a Variable Leaky Least Mean Square (VLLMS) based algorithm for harmonics estimation in distorted power system signals. Further, for mitigation of these harmonics a Hybrid Active Power Filter (HAPF) with modified Pulse Width Modulation (PWM) control technique has been designed. Both simulation and experimental studies are carried out for evaluating the estimation and filtering performances. VLLMS provides improved performance in estimation compared to LMS and Variable Step Size LMS (VSSLMS). Further, HAPF exhibits improved harmonics filtering performance compared to both active and passive power filters. View full abstract»

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  • A new control strategy for power supply on chip using parallel connected DC-DC converters

    Page(s): 109 - 112
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    In recent years, a power supply on chip (SoC) has been attracted attentions of many researchers because it can realize ultimate minimization of the power supply. This realizes higher electric power density and lower manufacturing cost. However, it is necessary to connect parallel at heavy loading conditions because this can handle smaller power per chip. In addition, switching frequency of more than 10 MHz is required for reducing the volume of the power supply. In such a scheme, the traditional analog based PWM will face the problems and a new control strategy is required. This paper proposes a new control strategy of the power-SoC based on parallel connections of dc-dc converters by digital control. We also report the simulation and experimental results of the proposed strategy. The results show that the proposed strategy works well and improves the efficiency over the wide range. View full abstract»

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  • SoPC based digital current-mode control of full-bridge phase-shifted DC/DC converters with fast dynamic responses

    Page(s): 113 - 118
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    This paper proposes a SOPC (system-on-a-programmable-chip) solution for the digital current-mode control of a full-bridge phase-shifted (FB-PS) DC-DC converter to achieve fast dynamic response. The digital current-mode control scheme consists of several parts: a digital phase-shifted PWM generator to generate programmable phase-shifted PWM signals, a digital current controller, and a digital voltage controller through which an adaptive gain adjustments scheme could adjust controller parameters to achieve a fast dynamic response of the output voltage, and with a synchronous current sampling scheme to avoid switching noise and spike. The implementation of the proposed digital current-mode controller was realized by using a mixed-signal FPGA A2F200 from Microsemi SmartFusion. Experimental results are given to verify and show the feasibility of the proposed control scheme to a 800W, 400V to 12V DC-DC dc-dc converter in applications to highperformance server power supplies. View full abstract»

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  • Modeling and control of isolated full bridge boost DC-DC converter implemented in FPGA

    Page(s): 119 - 124
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    In this paper an isolated full bridge boost converter (IFBC) firstly is modeled. In the modeling part, a small signal equivalent of the converter is developed. From the small signal model, the converter transfer function is derived. Based on the obtained transfer function, challenges of controller design are discussed. In the next step a digital PI controller is designed and implemented in a FPGA to control the output voltage. Using the injection transformer method the open loop transfer function in closed loop is measured and modeling results are verified by experimental results. View full abstract»

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