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Power Electronics and Drive Systems, 2007. PEDS '07. 7th International Conference on

Date 27-30 Nov. 2007

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  • [Front cover]

    Page(s): C1
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  • History of PEDS Conference

    Page(s): nil1
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  • Organizers/Committees

    Page(s): nil2
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  • International Steering Committee

    Page(s): nil3
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  • List of reviewers

    Page(s): nil4 - nil5
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  • Table of contents

    Page(s): nil6 - nil70
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  • Fuel cell systems and applications

    Page(s): 1 - 57
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    A collection of slides from the author's conference presentation is given. View full abstract»

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  • Recent Trends in Power Quality Improvements Techniques

    Page(s): 1 - 155
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    A collection of slides from the author's conference presentation is given. View full abstract»

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  • Power Electronics for Future Utility Applications

    Page(s): K-1 - K-8
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    Medium-voltage converters, originally developed for industrial drives (e.g. in steel and paper mills), have nowadays entered utility applications. For several years, the growing need for power quality in distribution systems in conjunction with the large scale integration of renewable energy sources has boosted the demand for new technologies. Together with communication systems, power electronics are the key enabling technology to meet these challenges. This paper addresses several utility applications for power electronics, some of which are in use already today though market penetration is still low. In the field of high power inverters, conventional 3-level hard-switching converters as presently used e.g. in wind turbines are presented alongside with soft-switching converters and their possible applications such as STATCOMs or mini-turbines. The possibility of using DC instead of AC transmission and distribution systems will be discussed. DC systems have already been used for several decades to transmit bulk power. New opportunities for the use of modern VSC-HVDC will be shown, such as DC distribution systems. For this novel application, new technologies are needed, such as multi-megawatt DC-DC converters and DC circuit breakers; possible concepts for these technologies will be addressed. Cycloconverters, a rather conventional technology, have been applied recently in innovative ways to increase the efficiencies of very high-power pumped- hydro storage systems. Due to the fact that the development of new converter systems is always strongly related to the available device technology, future high-power devices will finally be discussed. View full abstract»

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  • Digital Control Generations -- Digital Controls for Power Electronics through the Third Generation

    Page(s): P-1 - P-5
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    Digital control in power electronics can be divided into three "generations." First-generation digital controls use digital "outside the loop" in communications, setup, and supervisory roles. Second generation digital controls use digital processes "inside the loop," including discrete-time feedback loops and sometimes even digital signal processing. Today, first-generation digital methods are expanding quickly, as new communication protocols and adjustable analog loops become common. Even companies that continue to design analog controls for power electronics often include these types of digital processes. Second-generation digital controls are a hot topic right now, as real-time digital controllers become feasible. In third-generation digital controls, the digital process functions directly with individual switches to push performance up to the physical limits of power electronics. A digital switch decides when it must turn on or off. The control is on direct switch timing rather than a converter duty ratio or a setting. Extreme performance is possible with this approach, such as converters that do not exhibit output disturbances when confronted with load or line step changes. The talk compares these different arenas, all of which are current active topics in power electronics, and shows what can become possible as the third generation develops. View full abstract»

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  • Power Electronics and Control of Renewable Energy Systems

    Page(s): P-6 - P-28
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    The global electrical energy consumption is still rising and there is a demand to double the power capacity within 20 years. The production, distribution and use of energy should be as technological efficient as possible and incentives to save energy at the end-user should also be set up. Deregulation of energy has in the past lowered the investment in larger power plants, which means the need for new electrical power sources may be very high in the near future. Two major technologies will play important roles to solve the future problems. One is to change the electrical power production sources from the conventional, fossil (and short term) based energy sources to renewable energy resources. Another is to use high efficient power electronics in power generation, power transmission/distribution and end-user application. This paper discuss some of the most emerging renewable energy sources, wind energy and photovoltaics, which by means of power electronics are changing from being minor energy sources to be acting as important power sources in the energy system. View full abstract»

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  • Design and Evaluation of a 60 000 rpm Permanent Magnet Bearingless High Speed Motor

    Page(s): 1 - 8
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    Bearingless motors are an alternative to motors with active magnetic bearings and have been investigated in low and medium speed range. The aim of this project is to introduce bearingless motor technology into high speed applications, e.g. compressors or special pumps. The design process and test results of a 60 000 rpm, 500 W prototype high speed bearingless PM motor are presented. Motor design is done using analytical equations accompanied by finite element (FE) calculations. Measurements on the existing two-pole prototype verify the different design steps. The successful operation at 60 000 rpm indicates that the bearingless motor technology is well suited for high speed applications. View full abstract»

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  • Performance Investigation of Two-, Three- and Four-Phase Bearingless Slice Motor Configurations

    Page(s): 9 - 16
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    The fact that bearingless slice motors (BSM) are widely used in pump systems in the semiconductor industry and for medical applications has caused the attention of other industries for this emerging technology. Here, costs, power consumption and pump volume play an important role. Since the mechanical setup of the motor has a strong impact on these issues five different motor and converter setups are comparatively evaluated and discussed in this paper. The comparison will be carried out for two-, three- and four-phase BSM concepts based on performance indices such as power losses, power electronics requirements and cost-related realisation issues. View full abstract»

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  • Compensation of Pole Position Estimation Error for Sensor-less IPMSM Drives with DC Link Current Detection

    Page(s): 17 - 21
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    The authors have proposed a method to estimate the pole position for sensor-less IPMSM drives with only DC link current measurement and use a triangular comparison PWM technique. Using the proposed method, the current control has not to be interrupted and the band-pass filter is not necessary. The proposed method needs the current detection at apexes of triangular carrier waves, precisely. So the effect of the detection timing delay and the effect of the dead time are investigated. A method to compensate the pole position estimation error is also proposed. View full abstract»

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  • A Novel Dual-Stator Hybrid Excited Synchronous Wind Generator

    Page(s): 22 - 26
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (4209 KB) |  | HTML iconHTML  

    This paper presents a novel dual-stator hybrid excited synchronous wind generator (DSHESG). The structure characteristics are presented and no-load magnetic field is computed by 3-D finite element method. Static characteristics including magnetic flux density, EMF, inductances are analyzed. A closed-loop control system for field windings using PWM method is built on the basis of mathematical model of DSHESG. Thanks to the field windings the air-gap magnetic flux can be easily controlled, and the output voltage of DSHESG can be kept at a constant value with the speed or load varying. The dual-stator machine can increase output voltage effectively as well. Tests are performed on the prototype machines to validate analysis results, and an excellent agreement is obtained. View full abstract»

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  • Application of Multi-level Multi-domain Modeling in the Design and Analysis of a PM Transverse Flux Motor with SMC Core

    Page(s): 27 - 31
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    This paper presents the design and analysis of a permanent magnet (PM) transverse flux motor with soft magnetic composite (SMC) core by applying multi-level multi-domain modeling. The design is conducted in two levels. The upper level is composed of a group of equations which describe the electrical and mechanical characteristics of the motor. The lower level consists of two domains: electromagnetic analysis and thermal calculation. The initial design, including structure, materials and major dimensions, is determined according to existing experience and empirical formulae. Then, optimization is carried out at the system level (the upper level) for the best motor performance by optimizing the structural dimensions. To successfully deal with such a multi-level multi-domain optimization problem, an effective modeling with both high computational accuracy and speed is required. For accurately computing the key motor parameters, such as back electromotive force, winding inductance and core loss, magnetic field finite element analysis is performed. The core loss in each element is stored for effective thermal calculation, and the winding inductance and back EMF are stored as a look-up table for effective analysis of the motor's dynamic performance. The presented approach is effective with good accuracy and reasonable computational speed. View full abstract»

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  • New Approximate 2DOF Digital Controller for DC-DC Converter with Second-Order Differential Characteristics

    Page(s): 38 - 43
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    Robust DC-DC converter which can cover extensive load changes and also input voltage changes with one controller is needed. Then the demand to suppressing output voltage change becomes still severer. We proposed an approximate 2DOF digital controller which which realizes the start-up response and dynamic load response independently. The controller makes the control bandwidth wider, and at the same time makes a variation of the output voltage small at sudden changes of loads and the input voltages. In this paper, a new approximate 2DOF digital controller using additional zeros is proposed. The new controller makes a variation of the output voltage more small at sudden changes of loads and the input voltages. This controller is actually implemented on a DSP and is connected to a DC-DC converter. Experimental studies demonstrate that this type of digital controller can satisfy given severe specifications. View full abstract»

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  • High Accuracy CMOS Current Sensing Circuit for Current Mode Control Buck Converter

    Page(s): 44 - 48
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    A current mode control ( CMC) integrated circuit (IC) with accuracy current sensing circuit (CSC) for buck converter is presented in this paper. With the proposed accurate integrated current sensor, the sensed inductor current, combined with the internal ramp signal, can be used for current mode DC-DC converter feedback control. The proposed CSC does not need an operational amplifier to implement, and has been fabricated with a standard 0.35 mum CMOS process. Simulation results show that the switching converter can be operated up to 1MHz. Which is suitable for signal cell lithium-ion battery supply applications, the power efficiency is over 85% for supply voltage from 2.5 V to 5 V and the output current is 200 mA. The performance of the proposed circuit is the good compared to the other circuits. View full abstract»

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  • Small Signal Analysis of a dual-switch forward Converter with non-ideal transformer in Current-Programmed Control

    Page(s): 49 - 52
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    A small signal analysis approach of a dual forward converter with non-ideal transformer in current-programmed control (CPC) has been investigated in this paper. A small-signal model has been derived to determine the small-signal characteristics of the converter. By employing this model, the following significant features have been revealed or explained: (1) if the artificial ramp slop is properly selected, the ideal line-to-output transfer function of the converter becomes zero. That is to say, the output voltage fluctuation of causing from a perturbation of the DC bus voltage can be substantially restrained; (2) the CPC can greatly reduce the Q-factor and make the converter to become a low Q-factor system; (3) the current- programmed control can extend the bandwidth; (4) the magnetizing inductor plays an important role in the converter, so we must consider it when we design the control circuit. View full abstract»

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  • High Frequency Transformer Designs for Improving Cross Regulation in Multiple-Output Flyback Converters

    Page(s): 53 - 56
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    The cross regulation in multiple-output flyback converters is affected by leakage inductances of the transformers. The suitable winding arrangements of the transformers will lead to the improvement of cross regulation. This paper presents the comparative study of various winding arrangements in the three winding flyback transformers. The cross regulation model is considered in form of the resistance matrix related to the leakage inductance parameters. The design guidelines for the transformer for improving cross regulation are given based on the experimental results. View full abstract»

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  • Operation of a wye Connected Three-Level Active Power Filter under Non-ideal Conditions

    Page(s): 62 - 67
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    A three-level wye shunt active power filter based on a predictive current controller and line voltage space vector modulation is presented and analyzed. This control scheme treats the non-ideal load as a pure resistive load and compensates the reactive power and harmonics under both ideal and non- ideal conditions, thus the power quality at point of common couplings is improved. Experimental results are presented to demonstrate the effectiveness of this approach, and also reveal the limitation of wye structure APF. View full abstract»

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  • Application of GPRS Techniques for Wide-Area Power Quality Monitoring

    Page(s): 68 - 72
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (11719 KB) |  | HTML iconHTML  

    This paper tries to use USB and personal digital assistant to develop a novel power quality (PQ) monitoring platform and then integrates GPRS technique into the proposed PQ platform to realize wide-area PQ monitoring. The works of this paper can be divided into three parts. First, a small-scale PQ monitoring platform with appropriately designed I/O interfaces and peripherals is designed and implemented. Next, a GPRS module which can be integrated into the designed PQ monitoring platform is developed. Finally, a web server with well-designed database used to record abnormal PQ data is designed. The proposed GPRS based wide-area PQ monitoring system can be used for PQ monitoring with minimum cost and maximum efficiency All the functions implemented in this paper can realize the novel, real-time and wide-area PQ monitoring. Experimental results demonstrate the validity of the proposed system. View full abstract»

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  • Design and Development of Autotransformer Based 24-Pulse AC-DC Converter fed Induction Motor Drive

    Page(s): 73 - 80
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    This paper deals with a reduced rating delta-polygon autotransformer based twenty-four-pulse AC-DC converter feeding variable frequency induction motor drives (VFIMD's) for improving power quality at the point of common coupling (PCC). The proposed twenty four-pulse ac-dc converter is realized on the principle of dc ripple re-injection technique for harmonic mitigation. The design of the proposed autotransformer is developed along with the necessary modifications required for making it suitable for retrofit applications, where presently a 6-pulse diode bridge rectifier is used. The effect of load variation on VFIMD is also studied to demonstrate the effectiveness of the proposed ac-dc converter. The extensive tests are conducted on the developed prototype autotransformer based ac-dc converters. Different power quality indices of 6-pulse, 12-pulse and proposed 24-pulse ac-dc converters are obtained from simulation and verified from experimental results. View full abstract»

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  • Power Quality Monitoring System Using Real-Time Operating System

    Page(s): 81 - 84
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    This paper represents the methodology for monitoring continuously of power quality (PQ) by using real-time operating system (RTOS). The monitoring system acquired analog signals and send data via Ethernet network based on RTOS programs. After obtained signals, the monitoring system then send PQ information to the personal computer. The applied protocol is the user datagram protocol (UDP) to send PQ information via Ethernet. The architecture and software implementation are mentioned in the paper. An application test was created to test the throughput of the communication between the measurement point and the target computer. View full abstract»

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  • Technology Performance Comparison of Triacs Subjected to Fast Transient Voltages

    Page(s): 85 - 89
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    This paper presents an experimental comparison of several Triac devices under immunity tests, as described in the IEC 61000-4-4 standard. After a short reminder of the different Triac technologies available today (TOP, MESA and PLANAR technologies), the IEC 61000-4-4 test procedure to compare the devices is explained. The immunity results are discussed according to the devices' technology and the gate current sensibilities. A discussion about relevance of dV/dt parameter and die area is carried on to differentiate the devices in term of immunity capability. View full abstract»

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