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[1] J. Abu-Qahouq, H. Mao, and I. Batarseh, "Multiphase voltage-mode hysteretic controlled dc-dc converter with novel current sharing," - старонка 9

IEEE Transactions on Power Electronics, vol. 19, no. 2, pp. 289-295, 2004.

An adaptive fuzzy controller has been designed to develop a high-performance fault-tolerant switched reluctance motor (SRM) drive. The fuzzy controller continuously adapts its properties to regulate the machine torque as desired by the drive system even under fault conditions. The adaptation of the fuzzy membership functions results in extended conduction period and increased peak current of the healthy phases to deliver the commanded torque, as much as possible. The adaptive fuzzy controller provides smooth torque output with minimum ripple, even under fault conditions, yielding a high-performance SRM drive with fault-tolerant capability.

[111] V. M. Moreno, A. P. Lopez, and R. I. D. Garcias, "Reference current estimation under distorted line voltage for control of shunt active power filters," IEEE Transactions on Power Electronics, vol. 19, no. 4, pp. 988-994, 2004.

Shunt active power filters (APF) are used in power systems for the compensation of harmonic currents generated for non linear loads. A new digital reference current estimation method for control of APF using a Kalman digital algorithm is presented. Its capability of prediction avoids the effects of computational lags derived from the digital signal processing. The characteristics of the proposed technique are: the harmonic current compensation in a global or a selective way, the fast dynamical response and its independence from disturbances in the line voltage waveform. Simulation and experimental results under distorted supply voltages demonstrate the usefulness of the presented technique to improve the filtering performance. © 2004 IEEE.

[112] T. C. Neugebauer and D. J. Perreault, "Filters with inductance cancellation using printed circuit board transformers," IEEE Transactions on Power Electronics, vol. 19, no. 3, pp. 591-602, 2004.

Capacitor parasitic inductance often limits the high-frequency performance of filters for power applications. However, these limitations can be overcome through the use of specially-coupled magnetic windings that effectively nullify the capacitor parasitic inductance. This paper explores the use of printed circuit board (PCB) transformers to realize parasitic inductance cancellation of filter capacitors. Design of such inductance cancellation transformers is explored, and applicable design rules are established and experimentally validated. The high performance of the proposed inductance cancellation technology is demonstrated in an electromagnetic interference (EMI) filter design.

[113] J. G. Nielsen, M. Newman, H. Nielsen, and F. Blaabjerg, "Control and testing of a dynamic voltage restorer (dvr) at medium voltage level," IEEE Transactions on Power Electronics, vol. 19, no. 3, pp. 806-813, 2004.

The dynamic voltage restorer (DVR) has become popular as a cost effective solution for the protection of sensitive loads from voltage sags. Implementations of the DVR have been proposed at both a low voltage (LV) level, as well as a medium voltage (MV) level; and give an opportunity to protect high power sensitive loads from voltage sags. This paper reports practical test results obtained on a medium voltage (10 kV) level using a DVR at a Distribution test facility in Kyndby, Denmark. The DVR was designed to protect a 400-kVA load from a 0.5-p.u. maximum voltage sag. The reported DVR verifies the use of a combined feed-forward and feed-back technique of the controller and it obtains both good transient and steady-state responses. The effect of the DVR on the system is experimentally investigated under both faulted and nonfaulted system states, for a variety of linear and nonlinear loads. Variable duration voltage sags were created using a controllable LV breaker fed by a 630 kVA Distribution transformer placed upstream of the sensitive load. The fault currents in excess of 12 kA were designed and created to obtain the required voltage sags. It is concluded the DVR works well in all operating conditions.

[114] T. Ohnishi and M. Hojo, "Dc voltage sensorless single-phase pfc converter," IEEE Transactions on Power Electronics, vol. 19, no. 2, pp. 404-410, 2004.

We propose a simple dc voltage sensorless single phase PFC converter by detecting an ac line voltage waveform. Both dc voltage and ac current sensors used in the conventional PFC converter are not required to construct the control system. The conventional converter circuit with a boost chopper circuit in the dc side from a rectifier circuit is used as the main PFC converter circuit. In the control system, the circuit parameters such as a series inductance L and equivalent load resistance value Rd are used to generate the sinusoidal current waveform. The dc voltage is directly controlled by the command input signal kd(= Ed/Ea) for the boost chopper circuit. The dc voltage regulation is small because of the feed forward control for the ac line voltage Ea and no dependence of the circuit parameters. The sinusoidal current waveform in phase with the ac line voltage can be obtained. The feasibility of the proposed control system is verified by some simulation and experimental results.

[115] O. Ojo and P. M. Kshirsagar, "Concise modulation strategies for four-leg voltage source inverters," IEEE Transactions on Power Electronics, vol. 19, no. 1, pp. 46-53, 2004.

The continuous, discontinuous pulse-width modulation (PWM) schemes and a novel space vector modulation methodology are proposed in this paper for four-leg dc-ac inverters. Using a space vector definition that includes the zero sequence voltage component and partitioning the feasible sixteen modes into two separate sets - one set having zero sequence voltages with positive magnitudes and the other set with negative magnitudes - the novel Space vector implementation technique is determined as also the discontinuous carrier based PWM scheme. For the continuous carrier based PWM scheme, the indeterminate defining output voltage equations expressed in terms of the existence functions of the switching devices are solved using an optimization technique. The modulation schemes determined are shown by experimental results to synthesis any desirable balanced or unbalanced three-phase voltage sets when operating in the linear modulation region.

[116] P. R. Palmer and H. S. Rajamani, "Active voltage control of igbts for high power applications," IEEE Transactions on Power Electronics, vol. 19, no. 4, pp. 894-901, 2004.

The operation of an insulated gate bipolar transistor (IGBT) in its active region is a well established technique for withstanding short circuits and also for dv/dt control. In this paper, we exploit the active behavior of the IGBT, applying a voltage feedback loop to the IGBT to control its switching. It is shown that adding a bias to the demand reference waveform shifts the IGBT into the active region and permits wide bandwidth operation over most of the switching transient. The operation of the IGBT is reported in detail, making reference to a selection of experimental waveforms for 400-A, 1700-V capsule IGBTs. The implementation required for control of such large IGBT modules and capsule devices for high power applications is described and discussed. It is concluded that the active voltage control method allows the operation of high power IGBT circuits to be closely defined. © 2004 IEEE.

[117] C.-T. Pan, Y.-S. Huang, and C.-Y. Li, "An error bounded current controller with constant sampling frequency," IEEE Transactions on Power Electronics, vol. 19, no. 3, pp. 739-747, 2004.

In this paper, a constantly sampled current controller is proposed such that the controlled current can track the command within a specified error bound to guarantee the desired power quality. The authors further propose a simple two-value inner bound for current error comparison to determine the right time to add the zero-mode control to reduce both the switching frequency and the resulting current error. Moreover, an upper bound of the constant sampling period for the controller to guarantee the desired performance is derived and some design criteria are given for proper coordination among the design parameters. Finally, some simulation and experimental results are given to demonstrate the feasibility of the proposed current controller.

[118] Z. Y. Pan and F. L. Luo, "Novel soft-switching inverter for brushless dc motor variable speed drive system," IEEE Transactions on Power Electronics, vol. 19, no. 2, pp. 280-288, 2004.

Brushless dc motor has been widely used in industrial applications because of its low inertia, fast response, high power density, high reliability and maintenance-free. It is Usually supplied by a hard-switching PWM inverter, which normally has low efficiency since the power losses across the switching devices are high. In order to reduce the losses, many soft switching inverters have been designed. Unfortunately, there are many drawbacks, such as high device voltage stress, large dc link voltage ripple, complex control scheme and so on. This paper introduces a novel soft-switching inverter which generates notches of the dc bus voltage becomes to zero during chopping switches commutation to guarantee all switches working in zero voltage state. The result of this investigation will be very useful for industrial applications.

[119] G. A. Papafotiou and N. I. Margaris, "Calculation and stability investigation of periodic steady states of the voltage controlled buck dc-dc converter," IEEE Transactions on Power Electronics, vol. 19, no. 4, pp. 959-970, 2004.

A new method for investigating the complex dc-dc converters dynamics is suggested in this paper. The method is based on the formulation of a nonlinear difference equation with respect to the duty cycle. This equation embodies the nonlinear and discrete-time characteristics of dc-dc converters and allows both the calculation of normal and subharmonic steady states and their local stability analysis. The method is presented through the analysis of a voltage controlled Buck dc-dc converter. © 2004 IEEE.

[120] P. E. Pascoe and A. H. Anbuky, "Vrla battery discharge reserve time estimation," IEEE Transactions on Power Electronics, vol. 19, no. 6, pp. 1515-1522, 2004.

The discharge reserve time of a valve regulated lead acid (VRLA) battery is dependent on both discharge operating conditions as well as battery condition. Operating conditions include discharge type and rate, ambient temperature and initial state of charge while battery conditions include battery state of health and battery type. For this reason determining the discharge reserve time can be a very complex problem. This paper presents a simple approach for estimating VRLA battery state of charge (SOC) and thus discharge reserve time during discharge over a wide range of operating and battery conditions. A discharge characteristic, referred to as the unified characteristic, is employed that is shown to be robust to variations in operating conditions as well as battery condition. Furthermore, the resulting accurate estimations of SOC (within 10%) and reserve time (within 10% from the early stages of the discharge) do not come at the cost of complexity. © 2004 IEEE.

[121] F. Z. Peng, "Special issue on distributed power generation," IEEE Transactions on Power Electronics, vol. 19, no. 5, pp. 1157-1158, 2004.

[122] F. Z. Peng, H. Li, G.-J. Su, and J. S. Lawler, "A new zvs bidirectional dc-dc converter for fuel cell and battery application," IEEE Transactions on Power Electronics, vol. 19, no. 1, pp. 54-65, 2004.

This paper presents a new zero-voltage-switching (ZVS) bidirectional dc-dc converter. Compared to the traditional full and half bridge bidirectional dc-dc converters for the similar applications, the new topology has the advantages of simple circuit topology with no total device rating (TDR) penalty, soft-switching implementation without additional devices, high efficiency and simple control. These advantages make the new converter promising for medium and high power applications especially for auxiliary power supply in fuel cell vehicles and power generation where the high power density, low cost, lightweight and high reliability power converters are required. The operating principle, theoretical analysis, and design guidelines are provided in this paper. The simulation and the experimental verifications are also presented.

[123] F. Z. Peng, G.-J. Su, and L. M. Tolbert, "A passive soft-switching snubber for pwm inverters," IEEE Transactions on Power Electronics, vol. 19, no. 2, pp. 363-370, 2004.

This paper presents a regenerative passive snubber circuit for pulse-width modulation (PWM) inverters to achieve soft-switching purposes without significant cost and reliability penalties. This passive soft-switching snubber (PSSS) employs a diode/capacitor snubber circuit for each switching device in an inverter to provide low dv/dt and low switching losses to the device. The PSSS further uses a transformer-based energy regenerative circuit to recover the energy captured in the snubber capacitors. All components in the PSSS circuit are passive, thus leading to reliable and low-cost advantages over those soft-switching schemes relying on additional active switches. The snubber has been incorporated into a 150 kVA PWM inverter. Simulation and experimental results are given to demonstrate the validity and features of the snubber circuit.

[124] D. J. Perreault and V. Caliskan, "Automotive power generation and control," IEEE Transactions on Power Electronics, vol. 19, no. 3, pp. 618-630, 2004.

This paper describes some new developments in the application of power electronics to automotive power generation and control. A new load-matching technique is introduced that uses a simple switched-mode rectifier to achieve dramatic increases in peak and average power output from a conventional Lundell alternator, along with substantial improvements in efficiency. Experimental results demonstrate these capability improvements. Additional performance and functionality improvements of particular value for high-voltage (e.g., 42 V) alternators are also demonstrated. Tight load-dump transient suppression can be achieved using this new architecture. It is also shown that the alternator system can be used to implement jump charging (the charging of the high-voltage system battery from a low-voltage source). Dual-output extensions of the technique (e.g., 42/14 V) are also introduced. The new technology preserves the simplicity and low cost of conventional alternator designs, and can be implemented within the existing manufacturing infrastructure.

[125] A. Pigazo and R. I. Diego, "Erratum: "reference current estimation under distorted line voltage for control of shunt active power filters" (ieee transactions on power electronics)," IEEE Transactions on Power Electronics, vol. 19, no. 6, pp. 1688, 2004.

[126] J. Pontt, J. Rodriguez, and R. Huerta, "Mitigation of noneliminated harmonics of shepwm three-level multipulse three-phase active front end converters with low switching frequency for meeting standard ieee-519-92," IEEE Transactions on Power Electronics, vol. 19, no. 6, pp. 1594-1600, 2004.

Three-level neutral-point clamped (NPC) active-front-end three-phase (3LAFE) converters can be applied to high-power medium voltage applications, with four-quadrant unity-power-factor operation, allowing a broad range for power conversion systems, such as decentralized energy distribution and utilization. Switching losses and network interaction limit the operation of 3LAFE high-power converters, especially when GTO-converters are used. This is why low switching frequency and reduced harmonic distortion are the main goals when using optimum pattern pulsewidth modulation (PWM) where the selective harmonic elimination modulation method (SHEPWM) is used. This paper introduces a simple strategy to choose a good operating point for two 3LAFE converters in a 12-pulse configuration based on the behavior of noneliminated harmonics by SHE method. This strategy allows accomplishing the meeting of the IEEE std. 519-92 and jointly, the minimization or elimination of harmonics filters. A complete characterization is given as a base of SHE method and for noneliminated harmonics behavior, as well as the full explanation of the optimization strategy. Experimental results show the strategy effectiveness for reducing harmonic distortion and meeting IEEE std. 519-92. © 2004 IEEE.

[127] J. Pou, R. Pindado, D. Boroyevich, and P. Rodriguez, "Limits of the neutral-point balance in back-to-back-connected three-level converters," 2010-07-19 18:44 Читать похожую статью
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