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Power Electronics, IEEE Transactions on

Issue 3 • Date May 2002

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Displaying Results 1 - 15 of 15
  • Three-dimensional space vector modulation for four-leg voltage-source converters

    Publication Year: 2002 , Page(s): 314 - 326
    Cited by:  Papers (150)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (612 KB)  

    Four-leg voltage-source converters can effectively provide the neutral connection in three-phase four-wire systems. They can be used in inverter, rectifier, and active filter applications to handle the neutral current caused by the unbalanced and/or nonlinear load or unbalanced source. In this paper, three-dimensional (3-D) space vector modulation (SVM) schemes are proposed for controlling the four-leg voltage-source converters. Important issues for 3-D SVM, such as definition of 3-D vectors, identification of adjacent switching vectors in the 3-D space, and switching vector sequencing schemes and comparisons are addressed. The proposed 3-D SVM is a superset of the traditional two-dimensional (2-D) SVM, and thus it inherits all the merits of the traditional 2-D SVM. A 100 kW 5 kHz four-leg inverter and a 20 kHz four-leg rectifier prototypes are built and controlled by the proposed 3-D SVM. Experimental results are presented to validate the effectiveness of the 3-D SVM View full abstract»

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  • Nonlinear internal-model control for switched reluctance drives

    Publication Year: 2002 , Page(s): 379 - 388
    Cited by:  Papers (17)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (403 KB) |  | HTML iconHTML  

    A nonlinear internal-model control (IMC) based on suitable commutation strategy for switched reluctance motors (SRMs) is proposed. In the commutation strategy, a fixed critical rotor position is defined as the commutation point, which results in reduced computation. Combined the simplicity of the feedback linearization control and the robustness of IMC structure, the proposed drive has excellent dynamic and static performances for the torque and current control. The scheme is analyzed, and some important properties are obtained. Simulations and experiments were carried out on a 7.5 kW four-phase SRM, and the results show that the ripple of the output torque is very low in spite of model-plant mismatches View full abstract»

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  • Design and implementation of an inverter output LC filter used for dv/dt reduction

    Publication Year: 2002 , Page(s): 327 - 331
    Cited by:  Papers (56)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (265 KB)  

    This paper presents the design and analysis of a LC output filter for use with IGBT-based motor drive inverters. The LC filter is used to limit the rate of rise of the inverter output voltage and reduce common mode noise to the motor. In typical applications where dv/dt is limited to 100-500 V/μs, the resonant frequency of the filter is above the switching frequency. A diode bridge must therefore be used to clamp the resonant voltage. Resistors are also used to help dissipate the energy stored in the resonant circuit. Crucial to the design of the filter is the handling of the additional losses in the filter. The paper describes the design considerations for such a filter for use in a 460 V induction motor drive. The losses in the circuit are estimated to show the limitations of the filter. Experimental results illustrate the control of dv/dt at the inverter terminals, and the reduced peak voltage at the motor end of a long cable View full abstract»

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  • Virtual stage pulse-width modulation technique for multilevel inverter/converter

    Publication Year: 2002 , Page(s): 332 - 341
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB) |  | HTML iconHTML  

    The main theme of this paper is to present a new pulse-width modulation (PWM) technique for multilevel inverter/converter control, which provides more degrees of freedom for specifying the cost function than that for step modulation technique, for a given hardware. Therefore, the presented technique eliminates more specified low order harmonics without resorting to the increase of hardware. In comparison with the selective harmonic elimination PWM technique, for the same number of eliminated low order harmonics, the presented technique provides the advantages of both lower total harmonic distortion (THD) and less switching. Simulation and experimental results are presented to confirm the above-mentioned claims View full abstract»

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  • A speed estimator for high performance sensorless control of induction motors in the field weakening region

    Publication Year: 2002 , Page(s): 365 - 378
    Cited by:  Papers (30)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (439 KB) |  | HTML iconHTML  

    The paper proposes a modified version of the model reference adaptive system (MRAS) based speed estimator, whose outputs of the reference and the adjustable model are rotor flux space vectors. The estimator is modified in such a way that the variation in the instantaneous level of the main flux saturation during operation in the field weakening is recognized and properly compensated at all times. The speed estimation scheme is equally applicable to both vector controlled and direct torque controlled induction machines, since it operates in the stationary reference frame and requires measurement of only stator voltages and currents. Verification of the proposed scheme is provided by simulation and by experimentation on an indirect feedforward rotor flux oriented induction machine for speed references of up to twice the base speed View full abstract»

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  • High performance predictive dead-beat digital controller for DC power supplies

    Publication Year: 2002 , Page(s): 420 - 427
    Cited by:  Papers (78)  |  Patents (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB)  

    In this paper, a digital control technique based on a two-loop predictive dead-beat control concept is developed for switchmode DC/DC power supply applications. The dead-beat control law is derived directly from the switching characteristic of the converter. With the inductor current reaching the reference in a single control period, the proposed technique results in much improved control performance. In addition, the design procedure is simple and does not require extensive tuning. Furthermore, the computational resources required for the calculation of the control algorithm are reduced by half as compared to a conventional digitized PI structure. Both experimental and simulated results are provided to validate the proposed concept View full abstract»

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  • A comparison of UPS for powering hybrid fiber/coaxial networks

    Publication Year: 2002 , Page(s): 389 - 397
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (348 KB)  

    Four distinct uninterruptible power supply topologies are presented here for powering hybrid fiber/coaxial (HFC) networks. Topologies based on a low frequency isolation transformer are found to have better efficiency than the topologies with high frequency transformer. However, the latter topologies have much better performance in terms of transient response, quality of the output voltage, input power factor, total harmonic distortion of the input current, size and weight. The series-parallel resonant based UPS topology is found to have best overall performance for the emerging HFC applications View full abstract»

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  • Analogue implementation of a neural network controller for UPS inverter applications

    Publication Year: 2002 , Page(s): 305 - 313
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (361 KB)  

    An analogue neural-network controller for UPS inverter applications is presented. The proposed neural-network controller is trained off-line using patterns obtained from a simulated controller, which had an idealized load-current-reference. Simulation results show that the proposed neural-network controller can achieve low total harmonic distortion under nonlinear loading condition and good dynamic responses under transient loading condition. To verify the performance of the proposed NN controller, a hardware inverter with an analogue neural network (NN) controller (using mainly operational amplifiers and resistors) is built. Additionally, for comparison purposes, a PI controller with optimized parameters is built. Experimental results confirm the simulation results and show the superior performance of the NN controller especially under rectifier-type loading condition. Implementing the analogue neural-network controller using programmable integrated circuits is also discussed View full abstract»

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  • A novel zero-voltage and zero-current switching PWM DC-DC converter with reduced conduction losses

    Publication Year: 2002 , Page(s): 413 - 419
    Cited by:  Papers (18)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (332 KB)  

    A novel zero-voltage and zero-current switching PWM DC-DC converter with low conduction losses is presented in this paper. A new interleaved two-switch forward soft-switching converter topology is developed to minimize circulating current with no additional auxiliary circuits. This converter has many advantages such as less components, better efficiency, high power density and cost efficiency for high power applications. The principle of operation is illustrated together with steady-state analysis. Moreover, the effectiveness of the proposed converter topology is verified by implementing a 500 W-100 kHz breadboard using IGBTs View full abstract»

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  • A method for PWM rectifier line side filter optimization in transient and steady states

    Publication Year: 2002 , Page(s): 342 - 352
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (402 KB)  

    The purpose of this paper is to develop, design and test an overall approach to line side filter optimization for the current type PWM controlled active rectifier and to investigate influence of control system to converters performance and filter size (TkVA). For the instantly predominating offline current rectifier control methods, a line side filter optimization algorithm and corresponding computer program was proposed and developed. It uses both complete transient and steady state, characteristics of system, ensuring minimized individual and total harmonic distortion (according to standards) of line current and a good power factor together with minimum costs. Suggested method was numerically verified through the extensive simulations using SIMULINK toolbox of MATLAB software. Final verification came from the implementation on a prototype. Detailed testing was performed and the proposed algorithm showed satisfying performance under different operating conditions. As far as the authors are aware, the novel contribution coming from this paper is in completing the line side filter optimization algorithm taking into account both transient and steady state of system, power supply demands and the power factor restriction for the offline controlled current type AC/DC converter View full abstract»

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  • A novel uninterruptible power supply system with active power factor correction

    Publication Year: 2002 , Page(s): 405 - 412
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (320 KB) |  | HTML iconHTML  

    This paper presents a simplified sinusoidal uninterruptible power supply (UPS) system. The proposed scheme includes features such as high power factor, low total harmonic distortion and good dynamic response at the AC output voltage. In addition, the scheme has the desirable characteristics, of high efficiency, simple circuit and low cost compared with a traditional standalone multiple stages UPS with power factor correction. The paper also presents the circuit operation, the analysis and, experimental results of the proposed UPS scheme. The proposed UPS approach is a good solution in low. power applications (⩽500 W) View full abstract»

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  • A novel rotor resistance identification method for an indirect rotor flux-orientated controlled induction machine system

    Publication Year: 2002 , Page(s): 353 - 364
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (382 KB) |  | HTML iconHTML  

    This paper proposes a novel rotor resistance identification method for an indirect rotor flux-orientated controlled induction machine drive. The method is effectively integrated with the intermediate current control loop of the system. A decoupled synchronous voltage control scheme is used to achieve a fast, accurate current control response and indicates the relative thermal change of the rotor resistance. A model reference adaptive control scheme is then used to track the variation of the rotor resistance. Other issues, such as the nonideal characteristics of the power devices, stator resistance variation and comparison with two other parameter identification methods, are included. This method is less complex and more effective than others, and this is supported by theoretical analysis, and verified by simulation and experimental results View full abstract»

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  • Implementation and performance of automatic gain adjustment in a shunt-active filter for harmonic damping throughout a power distribution system

    Publication Year: 2002 , Page(s): 438 - 447
    Cited by:  Papers (50)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (488 KB) |  | HTML iconHTML  

    This paper discusses automatic gain adjustment in a fully-digital-controlled shunt active filter. This is the first step in cooperative control of the multiple active filters based on voltage detection for harmonic damping throughout power distribution systems. In general, the active filter should be equipped with an optimal control gain corresponding to the characteristic impedance of a distribution line. However, it is difficult to know circuit parameters of a real distribution line having various shunt capacitors and loads. Therefore, a main purpose of the gain adjustment is to make the active filter damp out harmonic propagation without considering the circuit parameters. In addition, the gain adjustment can reduce the compensating currents and losses in the active filter, and moreover it can avoid over-damping performance. Experiment results obtained from a 200-V, 20-kW laboratory system verify the effectiveness of the active filter equipped with automatic gain adjustment View full abstract»

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  • Parallel operation of modular power factor correction circuits

    Publication Year: 2002 , Page(s): 398 - 404
    Cited by:  Papers (4)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (277 KB) |  | HTML iconHTML  

    The parallel operation of modular power factor correction circuits is illustrated. The modular units using boost converters are operated at a constant frequency with variable duty-ratio. Flexible load demand is met by changing the number of operating modules under the maximum current limit. The operating modules have the same frequency and duty-ratio, but are equally phase-shifted to each other by a fraction of the switching period to reduce the ripple content and to increase the ripple frequency of the input current. With this phase-shifted control strategy, balanced current sharing among modules can be achieved by operating the boost converters at discontinuous current mode, without the need of extra current control circuit. A prototype circuit consisting of 15 modular units, which supply the attempted power rating of 3.75 kVA was implemented to verified the theoretical prediction View full abstract»

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  • Robust control of parallel DC-DC buck converters by combining integral-variable-structure and multiple-sliding-surface control schemes

    Publication Year: 2002 , Page(s): 428 - 437
    Cited by:  Papers (66)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (382 KB) |  | HTML iconHTML  

    We develop a robust controller for parallel DC-DC buck converters by combining the concepts of integral-variable-structure and multiple-sliding-surface control. The advantages of the scheme are its simplicity in design, good dynamic response, robustness, ability to nullify the bus-voltage error and the error between the load currents of the converter modules under steady-state conditions, and ability to reduce the impact of very high-frequency dynamics due to parasitics on the closed-loop system. We describe a method for determining the region of existence and stability of the sliding manifolds for such parallel converters. The results show good steady-state and dynamic responses View full abstract»

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Aims & Scope

IEEE Transactions on Power Electronics covers fundamental technologies used in the control and conversion of electric power.

Full Aims & Scope