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Control and Modeling for Power Electronics, 2008. COMPEL 2008. 11th Workshop on

Date 17-20 Aug. 2008

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  • Eleventh IEEE workshop on control and modeling for power electronics

    Publication Year: 2008 , Page(s): 1 - 11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2232 KB)  

    The following topics are dealt with: converter controller design and system modelling; digital control; power management and education. View full abstract»

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  • Circuit simulation in a research oriented education of power electronics

    Publication Year: 2008 , Page(s): 1 - 5
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (540 KB) |  | HTML iconHTML  

    The Chair for Power Electronics is responsible for the education of all students of electrical engineering and mechatronics of the University of Magdeburg in the field of power electronics. Starting in 2005, a basic modernization concerning both contents and methods of education has started. From 2007, the educational system in electrical engineering has been changed to the bachelor and master degrees system. The use of computers in lessons, seminars and laboratory exercises became essential for a modernized education. Circuit simulation helps to increase clarity and understanding of complex operation principles of power electronics and gives an excellent preparation for the industrial practice of the students. The main aspects of motivation, the basic concept and the first steps of integration in an e-learning environment and finally some examples of the use of simulation for teaching power electronics will be presented and experiences will be discussed. View full abstract»

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  • Accelerating design of digital buck DC-DC converters with nonlinear sampled-data models

    Publication Year: 2008 , Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (442 KB) |  | HTML iconHTML  

    This paper describes two new non-linear sampled-data models for buck DC-DC converters, derived from classical sampled-data representation, and including loop delay for the second one. Load transient behaviors of a recently proposed small-signal discrete model as well as the proposed models are compared with a large-signal, piecewise linear, switched model. A design methodology to optimize transient response of DC/DC digital controller using both linear, non-linear and piecewise linear models is then discussed. View full abstract»

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  • A novel diode-capacitor voltage multiplier for increasing the voltage of photovoltaic cells

    Publication Year: 2008 , Page(s): 1 - 5
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (401 KB) |  | HTML iconHTML  

    A new scheme of a diode-capacitor network, used as a DC voltage multiplier is proposed. The circuit operates in combination with a high-frequency switch. In contrast to the present similar circuits, during the operational process the capacitors are not shortened by the switch and therefore the large discharge current stresses donpsilat influence the circuit. The circuit provides the multiplication of the input voltage having a smooth (very small ripples) input current and output voltage. The advantages of the proposed circuit make it very appropriate for use with alternative sources of energy. SPICE-simulation and the experimental results confirm the theoretical expectations. View full abstract»

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  • Optimization of a wearable power system

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (535 KB) |  | HTML iconHTML  

    In this paper the optimization of wearable power system comprising of an IC engine, motor/generator, inverter/rectifier, Li-battery pack, DC/DC converters, and controller is performed. The Wearable Power System must have the capability to supply an average 20 W for 4 days with peak power of 200 W and have a system weight less then 4 kg. The main objectives are to select the engine, fuel and battery type, to match the weight of fuel and the number of battery cells, to find the optimal working point of engine and minimizing the system weight. The minimization problem is defined in Matlab as a nonlinear constrained optimization task. The optimization procedure returns the optimal system design parameters: the Li-polymer battery with eight cells connected in series for a 28 V DC output voltage, the selection of gasoline/oil fuel mixture and the optimal engine working point of 12 krpm for a 4.5 cm3 4-stroke engine. View full abstract»

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  • High-frequency, three-phase current controller implementation in an FPGA

    Publication Year: 2008 , Page(s): 1 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1254 KB) |  | HTML iconHTML  

    Three phase rectifiers with switching frequencies of 500 kHz or more require high speed current controllers. At such high switching frequencies analog controllers as well as high speed DSP-systems have limited performance. In this paper, two high speed current controller implementations using two different FPGAs - one for switching frequencies up to 1 MHz and one for switching frequencies beyond 1 MHz - are presented to overcome this performance limitation. Starting with the digital system design all the blocks of the signal chain, containing A/D interface, digital controller implementation using HW-multipliers and implementation of a novel high speed, high resolution PWM are discussed and compared. Final measurements verify the performance of the controllers. View full abstract»

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  • A new control method in PV grid connected inverters for anti-islanding protection by impedance monitoring

    Publication Year: 2008 , Page(s): 1 - 5
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (425 KB) |  | HTML iconHTML  

    This paper proposes a new control method for the single phase PV grid connected inverters. The proposed method injects interharmonic test current for measuring the impedance of the public grid to detect islanding situation. The proposed control system employs two PI controllers to generate the reference current separately for the fundamental frequency and interharmonic current, and finally applies a dead beat predictive control to determine the duty cycle of the switches. The grid impedance is measured simultaneously with injection of the interharmonic current using DFT algorithm. View full abstract»

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  • A DVS system based on the trade-off between energy savings and execution time

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (673 KB) |  | HTML iconHTML  

    DVS (dynamic voltage scaling) is a technique used for reducing the power consumption of digital circuits. The power consumed by these circuits has a main component (dynamic power) that is proportional to the square of the supply voltage. Additionally, for every supply voltage, there is a maximum value of the clock frequency. The advantage of using DVS is that the supply voltage (and hence clock frequency) can be adjusted depending on the specific needs during execution. The DVS concept has been used in some commercial products like Transmetapsilas Crusoe, Intel Speed Step, AMD K6, Hitachi SH4, etc. This paper presents results obtained by using a DVS algorithm based on the workload estimation and trade-off between the execution time and power savings. It is discussed about influence of the power supply's slew rate, algorithms influence on the system performance and problems to estimate the processors workload. The DVS system is realized on Intel's PXA255 platform and energy savings have been calculated by measuring directly voltages and currents on the platform. View full abstract»

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  • Analog IC design for real-time simulation of power electronic circuits

    Publication Year: 2008 , Page(s): 1 - 7
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (475 KB) |  | HTML iconHTML  

    This paper presents a feasibility study of real-time simulation of power electronic circuits using analog IC technologies. Unlike conventional analog simulation where a mathematical model is developed first and then implemented by using op-amps, the proposed approach simulates a power electronic circuit directly by analog devices and components. Capacitors and switches are shown to be amenable to direct IC implementation after proper scaling; inductors and diodes are emulated by active circuits to facilitate IC implementation. Such analog simulation avoids the limitations of digital simulation in terms of simulation time and convergence problems when applied to power electronic circuits. The overall concept has been tested by numerical simulation. Possible applications of the proposed method include simulation of large power electronic systems, rapid control prototyping and hardware-in-loop simulation, model-referenced adaptive control, and online diagnosis and prognosis. View full abstract»

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  • Operation of regenerative Cascade Multicell Converter under fault condition

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (909 KB) |  | HTML iconHTML  

    Reliability and fault tolerant operation are key aspects in high power drives, specially when these drives are used to operate critical loads, as downhill conveyors. This paper presents a solution for the operation under internal fault of high power regenerative cascade multicell converter, which allows to operate temporally in normal conditions or to turn off the equipment in a controlled way. Previous works have shown that it is possible to reduce the effects on the load due to internal faults by modifying the phase- shift between the output voltages. The proposed method uses the additional degree of freedom given by the controlled dc-link voltage of the PWM rectifiers, to increase the operation range, even reaching non-fault operation. View full abstract»

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  • A stability analysis of the mechanical simulator for induction motor speed sensor-less control in ultra lower speed range

    Publication Year: 2008 , Page(s): 1 - 7
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (647 KB) |  | HTML iconHTML  

    For the speed sensor-less control in the ultra lower speed range, the mechanical simulator method is applied to cope with the problems due to the extremely lower induced voltage. In the method, however, the mechanical parameterspsila error, such as the error of the inertia, affects the starting performance. To reveal the conditions for the stable starting, we carry out the phase plane analysis under the condition that the actual inertia J changes from the set inertia Js. Consequently, we find out Js ges J is the condition for the stable acceleration. The derived condition is useful as a design index of the mechanical simulator. Additionally, to cope with the large variation of the inertia, we carry out the phase plane analysis of the IM simulator method which compensates the estimation error of the rotor frequency. The analysis reveals that the method enables the stable acceleration while the estimation error of speed is remained in the case of inertia variation. Furthermore, we propose the modified IM simulator method which eliminates the deviation. By the phase plane analysis and experimental tests, we confirm the effectiveness of modified method. View full abstract»

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  • Simulation-based analysis of current control methods for voltage source inverters with practical considerations

    Publication Year: 2008 , Page(s): 1 - 8
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (480 KB) |  | HTML iconHTML  

    Simulations of voltage source inverters often only consider the ideal system performance, but in the real-world there are always non-ideal characteristics too. To provide insight into performance under non-ideal conditions and to make comparable analyses, particular levels of non-ideal characteristics can be introduced as a benchmark in simulation of current control strategies for voltage source inverters. The overall aim is to offer some implementation guidance so that control method suitability and associated issues/limitations are quickly identified (via knowledge of particular non-ideal characteristics that a certain control is susceptible to) - which hopefully saves time and/or cost during prototype development and verification. View full abstract»

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  • Multi-functional power converter building block to facilitate the connection of micro-grid

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (450 KB) |  | HTML iconHTML  

    This paper presents a structure of modified DC bus interconnected single-phase micro-grid, as well as a topology of power converter building block (PCBB) based on the DC bus to perform various functions in a distributed energy network. The main functions of the PCBB are: compensating the current harmonics produced by nonlinear load in the micro-grid, mitigating the voltage sag or swell of the electrical power system (EPS) at the point of common coupling (PCC) and facilitating the islanding and re-closure of micro-grid when a severe fault happens to the EPS. To enable the PCBB to work efficiently and effectively, a synchronous rotating frame (SRF) based 6nth order high bandwidth controller is applied to control the current harmonics compensation; a cascaded PI controller is used to regulate the voltage sag/swell compensation. A complete set of simulation results will be given to validate the viability and efficacy of the PCBB in inter-connecting the modified DC bus interconnected micro-grid. View full abstract»

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  • Fuel cell modelling for power supply systems design

    Publication Year: 2008 , Page(s): 1 - 4
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (384 KB) |  | HTML iconHTML  

    Today academic and industrial research is addressed on fuel cell based power supply to replace current lithium-ion and similar rechargeable battery systems. For system simulation, fuel cell models are developed. Even if power electronics designers demand for a black-box model to limit the knowledge of physical and chemical parameters, high performance in terms of model accuracy and portability is absolutely necessary. A steady state and dynamic fuel cell model oriented to power supply systems design is proposed and, as an example, the implementation on PSIM software is presented. Simulation and experimental results are compared and the model portability is discussed. View full abstract»

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  • Measurement-based load modelling for power supply system design

    Publication Year: 2008 , Page(s): 1 - 4
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (476 KB) |  | HTML iconHTML  

    Load modelling is essential to simulate system features as closely as possible to the effective behaviour. In spite of model complexity, the need for accuracy often leads to a component-based approach, i.e. the analysis of load internal subsystems. It is a common belief that measurement-based load models lead to low accuracy. This paper presents a new, high-accuracy measurement-based load modelling approach to define a power consumption profile load model for power systems design. The load modeling technique is described by an application. Simulation and experimental results are compared. The efficiency and portability of the proposed modelling approach is discussed. View full abstract»

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  • A novel design method to prevent SEPIC’s instability

    Publication Year: 2008 , Page(s): 1 - 4
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (476 KB) |  | HTML iconHTML  

    This paper presents a novel method for optimal selection of passive components of current controlled SEPIC dc-dc switching regulators, aimed at preventing converterpsilas current loop instability. The source of current loop instability is a couple of complex right half plane zeros of open loop duty-to-output transfer function. The stability is achieved by identifying real inductors and capacitors whose parameters ensure the presence of one right half plane zero only in the duty-to-output transfer function. A design example is discussed, which illustrates how to ensure stable SEPIC operation by means of the proposed design method. View full abstract»

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  • A passivity-based controller via parallel damping injection for three phase/level/switch unity power factor (Vienna I) rectifier

    Publication Year: 2008 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (512 KB) |  | HTML iconHTML  

    Passivity-based control (PBC) is based on a procedure including energy/power shaping and series/parallel damping injection to control several nonlinear systems such as power converters. In this paper, PBC is used to design a controller for three phase/level/switch PWM (Vienna I) rectifier. Passivity-based controller is supposed to regulate the output voltage and the input three phase sinusoidal currents to achieve unity power factor. Parallel damping injection is used for a controller design. Simulation results are presented to confirm the whole system performance and verify the analytical conclusions. It is also shown that the controller is robust to the load and (symmetrical) input variations. View full abstract»

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  • Multi-level electro-thermal modeling for circuit simulation of packaged power devices

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2305 KB) |  | HTML iconHTML  

    This paper explores a coupled electro-thermal modeling approach based on the integration of analytical compact models of semiconductor physics with a distributed three-dimensional description of thermal phenomena. The main motivation for the development of novel approaches resides in the increasing integration level of power components and equipment, which is pushing the validity of essentially-1D compact thermal models (i.e., RC-Networks) to their limit. Distinctive features of the proposed solution are great flexibility as regards the level of detail that needs to be considered (chip, substrate, heat-sink; 2D or 3D) and the suitability to describe diverse aspect-ratios and shapes. The resulting models are apt for use in general purpose circuit simulators (e.g., Saber, Simplorer) and to be coupled with realistic control and drive signals, enabling a more accurate and in-depth characterization of assembled devices. View full abstract»

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  • DSP-based controller for multi-output/multi-phase high switching frequency DC-DC converters

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (439 KB) |  | HTML iconHTML  

    This paper investigates the requirements of digital signal processing hardware necessary to perform digital voltage mode control of multiple DC-DC converters and multiple phase converters with switching frequencies in the range of 1-10 MHz. Special attention is given to the required computational hardware, with an analysis of the performance of several processor architectures in implementing a typical digital power control algorithm. The architectures are compared in terms of the number of separate converters/phases they can control and also the converter switching frequencies that can be handled. A detailed description of a flexible dual multiplier-accumulator processor architecture is given and a comparison is made with an existing solution with respect to application in high switching frequency converters. View full abstract»

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  • On the feasibility of using large-scale numerical electric machine field analysis software in complex electric drive system design tools

    Publication Year: 2008 , Page(s): 1 - 8
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (584 KB) |  | HTML iconHTML  

    This paper assesses large-scale numerical electric machine field analysis software and its feasibility for incorporation into complex electric drive system design loops. An opportunity to develop improved system design tools that meet the exacting standards of modern electric drive systems without sacrificing performance is identified. Two alternative routes to achieving this are discussed, one based on Moorepsilas Law and the other based on improving, updating, and intelligently combining and implementing in hardware the algorithms used in analysis software. An ideal design toolpsilas required properties are enumerated, and the merits and suitability for incorporation into such a tool of both domain- and boundary-based methods are examined. Finally, a hybrid design strategy is proposed that incorporates several of the analysis methods discussed and attempts to utilize the key strengths of each. View full abstract»

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  • A basic study on control strategy of hybrid powered railway vehicles with EDLC

    Publication Year: 2008 , Page(s): 1 - 6
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (689 KB) |  | HTML iconHTML  

    The authors study a basic and simple control strategy by managing the capacitor voltage for hybrid powered railway vehicle with a diesel engine EDLCs. In this paper, we first discuss the required capacity of EDLCs considering with the size and mass. Then, we propose a practical and simple method to manage the capacitor energy by changing the diesel engines output power according to EDLC voltage. The capacitance designing method and the proposed control method are verified by numerical simulations of train running, assuming a commercial line in Japan. We have concluded that the proposed method to decide the capacitance and the control method are available and this study contribute to promote environmental friendly transportation system. View full abstract»

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  • The effect of ESR of the capacitors on modeling of a quadratic boost converter

    Publication Year: 2008 , Page(s): 1 - 5
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (772 KB) |  | HTML iconHTML  

    In recent years, the development of new technologies is requiring power supplies with wide conversion voltages. An alternative solution is to use a quadratic boost converter with a single active switch. This converter has two LC filters; thus, it will exhibit fourth-order characteristic dynamics. In this paper, switched linear, nonlinear averaged and linear averaged models are developed for the aforementioned converter. These models contain the effect of equivalent series resistance (ESR) of the capacitors. It is shown that inclusion of this effect in the corresponding transfer functions will produce damping to the first and second resonant peaks. The above will, in turn, simplify the controller design for either current or voltage mode control. At the end, experimental data for a 43 W quadratic boost converter will be given using a frequency response analyzer. View full abstract»

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  • Time optimal, parameters-insensitive digital controller for VRM applications with Adaptive Voltage Positioning

    Publication Year: 2008 , Page(s): 1 - 8
    Cited by:  Papers (12)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (674 KB) |  | HTML iconHTML  

    A digital control approach is investigated for time-optimal load step response of Voltage Regulation Modules (VRM) equipped with low-ESR ceramic output capacitors. The proposed time-optimal technique is insensitive to the power stage parameters, as its operation does not rely on the knowledge of the output filter inductance or capacitance. The time-optimal response is achieved through a single on/off switching action undertaken as soon as a load transient is detected and automatically incorporates Adaptive Voltage Positioning (AVP) regulation. The proposed robust time-optimal approach is validated through both computer simulations and experimental tests on a synchronous buck converter prototype. View full abstract»

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  • Power factor correction via passivity-based adaptive controller using buck converter operating in continuous mode

    Publication Year: 2008 , Page(s): 1 - 8
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (542 KB) |  | HTML iconHTML  

    A passivity based control scheme is applied to a buck converter operating as an active power factor corrector. The converter is modeled via an Euler-Lagrange (energy) approach and two control laws are derived from this non linear model: a direct control (using the voltage in the capacitor) and an indirect control (via the current in the inductance current). The resistive load impedance is estimated using an adaptive approach. There is no need to consider the small signal condition as in the case of linearized models. The control laws satisfy a wide range of operation of the converter. View full abstract»

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  • Control strategy for a hybrid five-level three-phase PWM rectifier using twelve switching devices

    Publication Year: 2008 , Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (713 KB) |  | HTML iconHTML  

    This paper proposes a new circuit topology for a multilevel PWM rectifier. The proposed circuit combines a diode clamp type topology with a flying capacitor type topology. As a result, the proposed circuit uses only 12 switches, despite the use of a five-level three-phase PWM rectifier. Further, the proposed circuit can obtain good performance as same as to a conventional multilevel circuit. This paper describes the features of the proposed topology; the control strategy and loss analysis using circuit simulation. In addition, the basic operation of the proposed method is confirmed by simulation and experimental results. The proposed converter achieved 3.4% THD for the input current and 97.4% efficiency for a 1 kW class experimental setup. View full abstract»

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