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Power Electronics and Drive Systems, 1999. PEDS '99. Proceedings of the IEEE 1999 International Conference on

Date 27-29 July 1999

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  • Proceedings of the IEEE 1999 International Conference on Power Electronics and Drive Systems PEDS'99 [front matter]

    Page(s): i - xxviii
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    Freely Available from IEEE
  • Adaptive controller for PV supplied buck-boost converter

    Page(s): 789 - 793 vol.2
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    An adaptive controller using ANNs is designed for gross mechanical power output. The controller algorithm is developed by the matching the SCA to the motor load so that the combined system can operate at optimal point. This controller is for use in conjunction with intermediate power converter. The gradient descent algorithm is used to train the ANN. The input to the ANN is solar insolation and the output is converter duty ratio. The duty ratios for different solar insolations are obtained from the trained ANN are compared with computed values. The adaptive controller using ANN is tested for different configurations and the results are close to the computed values. View full abstract»

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  • Author index

    Page(s): 1172 - 1175
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    Freely Available from IEEE
  • Full-bridge current mode high-frequency link inverters

    Page(s): 961 - 965 vol.2
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    The full-bridge current mode high frequency link inverter based on the flyback topology consists of a HF inverter, a HF transformer and a cycloconverter. Its HF transformer enables energy storage as well as electrical isolation and voltage level adjustment. The inherent voltage surge problem in voltage mode HP link inverters is solved and switch loss of the cycloconverter is reduced in this inverter. Its basic operation principles, the instantaneous voltage control scheme, and brief design procedure are described in the paper. Simulation and experimental results of the experimental prototype verified that it has the following advantages such as compact topology, simple HF transformer structure, simple control scheme, good dynamic response, nonlinear load capacity and low voltage stress of switches View full abstract»

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  • Control of an active clamp discontinuous conduction mode flyback converter

    Page(s): 1120 - 1123 vol.2
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    Design of an active-clamp discontinuous conduction mode flyback converter (ADCMFC) is presented with the emphasis on output efficiency. The control of such a converter using PI, PID and LQR control had been explored. Both the simulation results and a practical circuit had been used to verify the design and the performance of the converter. Further suggestion of using neuro-fuzzy and generic type of controller is also proposed View full abstract»

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  • Universal custom power conditioner (UCPC) in distribution networks

    Page(s): 1067 - 1072 vol.2
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    In this paper, a general powerful circuit of a universal custom power conditioner (UCPC), which is used to improve power reliability and quality applied to distribution networks, is presented in detail. The UCPC is based on series and shunt tri-level PWM converters with a battery energy storage system (BESS) for multi-function operations such as harmonic elimination, reactive power control, voltage sags compensation and uninterruptible power supply (UPS). The basic algorithm of system is deadbeat control with a repetitive compensation strategy based on the voltage space vector PWM method. Some simulation results are use to verify that UCPC can synthetically fulfill different compensation functions View full abstract»

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  • Assessment of stability effects of HVDC link by an improved energy function method

    Page(s): 837 - 842 vol.2
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    This paper proposes new techniques for the fast transient stability analysis of power systems embedded with HVDC (high voltage DC link) based on a corrected transient energy function approach. The method is based on an innovative iteration approach used to evaluate the AC terminal voltages of HVDC links at each integration step and is developed for enhancing the efficiency of stability trajectory calculations. In addition, the corrected energy function approach with corrected transient energy and corrected potential energy boundary surface is used in the AC/DC system for the estimation of transient energy margin. The approach provides more accurate results in transient stability assessment than conventional hybrid methods. Simulation results on a 36-bus, 8-generator test AC/DC power system are presented to show that the approach offers a promising tool to estimate transient stability limit conditions for AC/DC systems View full abstract»

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  • Modeling of an active clamp discontinuous conduction mode flyback converter under variation of operating conditions

    Page(s): 730 - 733 vol.2
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    With the trend of miniaturization in electronic products, the power supply is one of the major components that needs to be reduced in size. Reduction in the size of power supplies can be achieved by a topology change from linear transformer type to switching mode. To reduce the size further, the switching frequency has to be increased. However, there are a number of limitations and problems associated with the increase of switching frequency. The active-clamp discontinuous mode flyback converter (ADCMFC) introduced in this paper is one of the solutions to increase the switching frequency. Besides, the paper also introduces an optimization method to obtain the transfer function of the ADCMFC under different operating conditions View full abstract»

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  • Repetitive control for vibration reduction of 3-phase HB-type stepping motor utilizing accelerometer and Fourier transformer

    Page(s): 815 - 820 vol.2
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    In this paper, the authors propose the repetitive control method using an accelerometer to reduce the vibration of the 3-phase hybrid-type (HB) stepping motor with cogging torque. A mechanical system, where the accelerometer is installed on the motor or load frame to detect the vibration due to the torque ripple of the motor, is constructed. Because the torque vibration periodically varies due to cogging torque, the repetitive control is effective for reduction of the vibration. Approximate analysis is preformed to study the stability of the repetitive control system. Another algorithm which is called feedforward control method is applied to the operating point changed by reference frequency in steady-state. Compensation signal for the new operating point will be generated from both amplitude and phase compensation data by repetitive control utilizing the linear interpolation method. The effectiveness of the proposed method is confirmed by experimental results View full abstract»

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  • Study of TCSC model and prospective application in the power systems of China

    Page(s): 688 - 691 vol.2
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    The basic concept and mathematical model of thyristor controlled series compensation (TCSC) in a power system are described. The static and dynamic performance of TCSC is investigated using EMTP digital simulation. A whole model system for TCSC dynamic simulated testing, including the actual microprocessor-based control hardware, was constructed to compare with EMTP simulation. The test results agree well with the analytical and simulation results. As an example of prospective application in the power systems of China, digital simulations of China's Yimin-Fengtun 590 kV transmission lines with a TCSC scheme are carried out. The main objective of this example is to demonstrate the effectiveness of TCSC in power swing damping View full abstract»

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  • Three-phase soft-switching inverter resonant with unique resonant snubbers

    Page(s): 1078 - 1083 vol.2
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    In this paper, a prototype of the auxiliary resonant commutated snubber circuit (ARCS) with a high frequency transformer power regeneration loop is described. This is a new soft switching topology developed for three phase voltage source soft-switching inverter, active power filter and reactive power compensator has the significant advantage of current rating reduction for auxiliary active switching devices. In addition, this paper presents a novel prototype of voltage-source soft switching space vector-modulated inverter with ARCS mentioned above, which is more suitable and acceptable for high-power utility interactive power conditioning, along with a digital control scheme. The steady-state operating analysis of ARCS has the remarkable features and the practical design procedure of this resonant snubber are illustrated on the basis of computer simulation analysis. The operating performance evaluations in the steady-state of this three phase voltage source soft switching inverter are discussed and compared with the three phase voltage source hard switching inverter View full abstract»

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  • Voltage and current hybrid controlled PWM inverters using variable structure control

    Page(s): 1010 - 1014 vol.2
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    In this paper, the voltage and current hybrid PWM inverters using the variable structure control technique is proposed for parallel operation. The voltage-controlled PWM inverter (VCPI) unit is developed to provide a specific sinusoidal output voltage and the current-controlled PWM inverter (CCPI) units are employed to track the distributive current. Each of the VCPI and CCPI units can be operated independently. By using the variable structure control scheme, the parallel inverters can provide excellent performance without the phase-lock-loop (PLL) circuit for synchronization. The proposed scheme can result in fast dynamic response and robustness to parameter variations. Finally, simulation results are performed to verify the proposed control scheme View full abstract»

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  • Multilevel inverter with series connection of H-bridge cells

    Page(s): 859 - 864 vol.2
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    A novel AC/DC/AC converter topology, a three-phase switching mode rectifier (SMR) and a three-phase multilevel inverter with separate DC power supplies, is proposed in this paper. To improve the power quality, three-phase SMR is adopted to supply sinusoidal wave with high power factor and current distortion. The separate DC bus voltages are provided by switching mode DC-DC converters. The full-bridge cells are adopted to provide multilevel line voltage. The control schemes of three-phase multilevel inverter are based on look-up table with sine-triangular PWM method. The voltage unbalance problem between the separate DC bus voltages is improved by using the proposed control scheme. The proposed AC/DC/AC converter is verified by computer simulations View full abstract»

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  • A novel space vector control of three-level PWM converter

    Page(s): 745 - 750 vol.2
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    In this paper, a novel space-vector PWM control method of three-level converter is proposed. The effect of the motor's phase current to DC voltage balance is analyzed in detail. After that, a new DC-voltage balance method is carried out. Compared to the conventional one, this method can adjust the DC voltage under all kinds of loads. At last, it is verified by experimental results View full abstract»

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  • An improved control method for three-phase active power filter

    Page(s): 905 - 909 vol.2
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    In this paper a three-phase active power filter with an improved control method is described in detail. Its main circuit topology adopts the three-phase four-wire voltage-source converter with split-capacitors. The control circuit generates current references for main currents to follow with a dynamic hysteresis-band current controller. The proposed active power filter may provide the following multifunction at the same time: reactive power compensation, harmonic suppression, and current balance in three-phase power system. Experimental results prove that the control method has the following features: simple control circuit, high system reliability, and good ability of reactive power compensation, harmonic suppression, and current balance View full abstract»

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  • Variable structure control of large synchronous generator

    Page(s): 1134 - 1139 vol.2
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    A new nonlinear variable structure excitation controller is proposed in this paper. Design of this controller combines the differential geometry theory with the variable structure control theory. The mathematical model in the form of “an affine nonlinear system” is set up for the control design of a large synchronous generator. The static and dynamic performances of the nonlinear variable structure controller for a single machine connected to an infinite bus power system is simulated. The responses of a system with the controller proposed are compared with those of the controller obtained with the nonlinear optimal controller when the system is subjected to a variety of disturbances. Simulation results show that the nonlinear variable structure excitation controller gives satisfactorily static and dynamic performance and good robustness View full abstract»

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  • Input ripple current cancellation technique resulting in less differential mode noise current

    Page(s): 615 - 620 vol.2
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    Switching current generated from the main switch in a switching converter injects a substantial amount of ripple current at the input side of the converter. The ripple current is undesirable, as it becomes an EMI noise source. Differential mode current traditionally need bulky and costly filtering components to suppress the first several harmonics down to an acceptable level. An alternative way to reduce the ripple, by means of nullification technique, is proposed. Both active and passive nullification approach are discussed in this paper. This technique results in smaller components size and reduced cost View full abstract»

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  • Control of STATCOM using cascade multilevel inverter for high power application

    Page(s): 871 - 876 vol.2
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    This paper proposes the novel control scheme of a static synchronous compensator (STATCOM) with cascade multilevel inverter which employs an H-bridge inverter (HBI). The STATCOM system is modeled using the D-Q transform which calculates the instantaneous reactive power. This model is used to design a control strategy based on the control of the phase angle of the fundamental switching pattern. This switching method produces the staircase type waveform in a cascade multilevel inverter. The selective harmonic elimination (SHE) allows keeping the total harmonic distortion (THD) low in the output voltage of the inverter. The switching pattern is used as a programmed switching pattern stored in an EPROM. A rotated switching scheme of fundamental frequency is switched to be on and off equally for each device and applied to control the DC voltage balancing. As a result, it makes the DC voltage of STATCOM balance and the control response fast to the step change of reactive power View full abstract»

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  • Improved peak-current-mode control for unity power factor AC/DC converters in discontinuous conduction mode

    Page(s): 927 - 932 vol.2
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    In this paper, a new control technique based on the linear peak-current-mode is proposed for power factor correction in AC/DC boost-like power converters in the discontinuous conduction mode at a constant switching frequency. This technique uses a current loop and a slope varying compensating ramp, with input and output feedback signals, to achieve unity power factor even at low output voltages and can be implemented with simple circuit solutions. Experimental results are displayed with the aim of showing the validity of the proposed method View full abstract»

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  • A simple wind power generating system with permanent magnet type synchronous generator

    Page(s): 849 - 854 vol.2
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    The authors propose an inexpensive wind power generating system in this paper. Existing wind power generating systems are mostly of large capacity (over 100 kW) and high-priced (about 1000 USS/kW). Because of the erratic changes of wind power and of smoothing peak power, an AC/DC converter-fed battery system is recommended. Thus, one requires the exact rotating speed of generators (especially in the case of synchronous generators) to use AC/DC converters with high quality. These factors are increasing the cost of such systems. The authors adopt a compact permanent magnet type synchronous generator, which doesn't need exciting current, and a step-up/down buck-boost chopper to wind power generating system of a few kW output without position or speed sensor. In addition, they employ an inexpensive rectifier circuit using a diode bridge instead of an AC/DC power converter with PWM method. Using these methods, they achieve a simple and inexpensive wind power generating system View full abstract»

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  • Design of a permanent-magnet brushless DC motor drive for an electric bicycle

    Page(s): 714 - 718 vol.2
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    This paper presents the design of an axial-field PM brushless DC motor drive for use on an electric bicycle. Constructional details of the motor and the electronic converter are given. Performance analysis using the finite element method is briefly discussed. A prototype motor drive was constructed for verifying the actual performance. Good correlation between the theoretical and experimental results has been obtained. Test results confirmed the feasibility of the proposed motor design View full abstract»

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  • Progress in on-line adaptive, learning and evolutionary strategies for fuzzy logic control

    Page(s): 1108 - 1113 vol.2
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    In this paper, the eight kinds of on-line adaptive, learning and evolutionary strategies for fuzzy logic control are systematically introduced. All these afore-mentioned strategies have some drawbacks in terms of generalization and formulation. Hence a systematic way of combination and hybridization of these strategies will be very useful for improving the learning capacity and performance of algorithms based on these strategies. It is concluded that the orientation of deep-going pathfinding in the generation and modification of fuzzy control rules or models which is principally based on neural networks combined with genetic algorithms or other algorithms should be able to compensate for the disadvantages of neural networks learning View full abstract»

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  • A new method of damping harmonic resonance at the DC-link of a large-capacity rectifier-inverter system

    Page(s): 888 - 893 vol.2
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    This paper proposes a new method of damping harmonic resonance at the DC-link of a large-capacity rectifier-inverter system such as in rapid-transit railways. A voltage-source PWM converter is connected in series to the DC capacitor of the rectifier through a matching transformer, acting as a damping resistor to the DC capacitor current. No filters are needed to extract harmonic components from the DC capacitor current. This system is thus highly stable and the required rating of the PWM converter is less than one-thousandth of that previously proposed. The basic principle of the proposed damping method is discussed in detail, then confirmed using digital computer simulation. The simulation results demonstrate the excellent practicability of the proposed damping method View full abstract»

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  • Pulse by pulse current limiting technique for SPWM inverters

    Page(s): 1021 - 1026 vol.2
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    Impactive current overshoot is usually observed in SPWM inverter when impulsive loads are loaded. So far, several methods have been proposed to solve this problem, such as mean current feedback control or temporarily pulling down the voltage reference. Nevertheless, they both have shortcomings. This paper introduces a pulse by pulse current limiting (i.e. instantaneous drive pulse locking) technique which can substantially lessen the impact on SPWM inverter during all kinds of impulsive loading (even the short-circuit of the load). This technique has been used successfully in a 3.5 kW, 400 Hz single-phase full-bridge SPWM inverter. By the pulse by pulse current limiting technique, the successful loading of impulsive loads is ensured, and the loading process has little influence on the normal supply to other important loads which are powered by the inverter at the same time View full abstract»

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  • A comparison of torque capabilities of axial flux and radial flux type of brushless DC (BLDC) drives for wide speed range applications

    Page(s): 719 - 724 vol.2
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    This paper aims to evaluate capabilities of axial flux and radial flux brushless DC (AF and RF-BLDC) drives for washing machine applications (1:30 speed range). For this purpose, torque and EMF equations of the two types of motor are obtained in terms of electrical and magnetic loading and motor dimensions. Then the drives are evaluated on criteria such as efficiency, torque per unit mass and volume, torque per ampere etc. The AF-BLDC is found to have superior torque/mass ratio, however, this motor requires operation at high frequencies. Also, attention must be paid to control strategy to assure an acceptable torque/Amp ratio View full abstract»

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