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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The Transactions of the Korean Institute of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 7, Issue 6 - Dec 2002
Volume 7, Issue 5 - Oct 2002
Volume 7, Issue 4 - Aug 2002
Volume 7, Issue 3 - Jun 2002
Volume 7, Issue 2 - Apr 2002
Volume 7, Issue 1 - Feb 2002
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A Braking Algorithm of a PM synchronous Motor
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 313~321
A braking algorithm for a PM synchronous motor is presented. The resistance of the stator windings operates as a braking resistors and dissipates the regenerated power from the rotor without any braking components including the electronic power components and control circuits. The proposed braking algorithm maximizes the power dissipation in the stator windings and also generates the maximum braking torque under the limit conditions of DC link capacitor voltage and inverter currents so that it can minimize the braking time.
Low-Cost Single-Phase to Three-Phase AC/DC/AC PWM Converters for Induction Motor Drives
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 322~331
In this paper, a single-phase to three-phase PWM converter topology using a single-phase half-bridge PWM rectifier and a 2-leg inverter for low cost three-phase induction motor drives is proposed. In addition, the source voltage sensor is eliminated with a state observer which controls the deviation between the model current and the system current to be zero. The converter topology is of lower cost than the conventional one, which gives sinusoidal input current, unity power factor, dc output voltage control, bidirectional power flow and VVVF output voltage. The experimental results for V/F control of 3Hp induction motor drives have been shown.
Current Control of 12-pulse Dual Converter for High Current Coil Power Supply
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 332~338
High current coil power supply for superconductivity coil of tokamak requires fast dynamics performance of di/dt and smooth change over of current direction. To meet the specification high performance DSP-based controller Is designed for 12-pulse thyristor dual converter with interphase transformer(IPT). Not only the total current of Y and
converter units but also the difference for those should be regulated fast and accurately. Proportional and integral controller is designed for current difference control and the controller output is compensated to
converter. The source voltage phase angle detection and gate pulse generation algorithm are implemented in software for higher reliability of current control. The current error Is reduced by selection of appropriate initial gating angle during the transient of change over of current direction between thyristor converters.
Development of a portable power supply employing bidirectional energy flows
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 339~345
This paper presents a portable power supply equipped with a battery charger. The proposed system can be operated separatedly distinguishing between DC/AC and AC/DC function. The former uses a battery and the latter a line voltage as the power source to operate on an inverter and a battery charger, respectively. To keep the output voltage being sinusoidal and to have the high dynamic performances even In the cases of load variations, a proper control method is adapted. The operational principles and analysis are explained in detail. The validity of the proposed system is proved from the experimental results.
A Novel ZCS PWM Boost Converter with operating Dual Mode
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 346~352
A novel Zero Current Switching(ZCS) Pulse Width Modulation(PWM) boost converter with dual mode for reducing two rectifiers reverse recovery related losses is proposed. The switches of the proposed converter are operating to work alternatively turn-on and turn-off with soft switching condition In the every cycle and the proposed converter reduces the reverse recovery current, which is related switching losses and EMI problems, of the free-wheeling diode
by adding the resonant inductor Lr, in series with the switch
. The switching components
in the proposed boost converter are subjected to minimum voltage and current stresses same as those in their PWM counterparts because there are no additional active switches and resonant elements compared with the conventional ZVT PWM
. The operation of the proposed converter, in this paper, is analyzed and to verify the feasibility of the characteristics is built and tested.
Improved ZCS-PWM Boost Converter
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 353~358
In this paper, improved ZCS-PWM boost converter is proposed. The proposed converter eliminates additional conduction loss of a main switch by flowing circulating current oかy through an auxiliary switch. The operation modes of proposed converter are explained. And design procedure of resonant parameters is established. Experimental results are presented to verify the theoretic analysis of the proposed converter.
A New Low-Cost Active Power Filter to Suppress Neutral Current Harmonics in Three-Phase Four-Wire System
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 359~365
Three-phase four-wire electrical distribution systems have been widely employed in manufacturing plants, commercial and residential buildings. Due to the nonlinear loads, the neutral conductor carries excessive harmonic currents resulting in wiring failure of the neutral conductor, overloading of the distribution transformer and a voltage drop between the neutral and the ground. This paper proposes a reduced rating active power filter to suppress neutral current harmonics in three-phase four-wire electrical distribution systems. The proposed system is simple in control and the VA rating of the inverter could be significantly reduced since only the fundamental current due to unbalanced loading flows through the inverter switch. The experimental results on a prototype validate the proposed control approach.
A Fault-Tolerant Scheme for Direct Torque Controlled Induction Motor Drives
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 366~376
A sensor fault detection and isolation scheme(SFDIS) is adopted to improve the reliability of direct torque controlled induction motor drives and the experimental results are discussed. Major contributions include: experimental analysis of a few important sensor faults. design and implementation of the proposed SFDIS, and the fault tolerant control system(FTCS). Although the adopted SFDIS employs only one observer for residual generation, the system has the function of fault isolation that only multiple observer schemes can have. To verify the performance of the proposed scheme, the speed control system is designed for the 2.2kW direct torque controlled Induction motor. Hardware of the control system consists of a control board using TMS320OVC33 and a power stack using IPM. Experimental results for various type of sensor faults show the effectiveness of the SFDIS and the FTCS.
Comparison of Rotor Flux Observer Characteristics in Induction Motor Using Parameter Sensitivity
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 377~383
To obtain a high performance in a direct vector controlled induction machine, it is essential to obtain the current rotor flux. The accuracy of flux observers for induction machines inherently depends on parameter sensitivity. This paper proposes an analysis method for conventional flux observers using "parameter sensitivity". The "parameter sensitivity" is defined as the ratio of the percentage change in the system transfer function to the percentage change of the parameter variation. We define the ratio between real flux and estimated no as the transfer function, and analyze a parameter sensitivity of this transfer function. Practical verification is presented to conform the capabilities of the proposed analysis method.sed analysis method.
Variable Power Control of Inverter Spot Welding Machine using Evolution Algorithm
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 384~394
In this paper, a new control strategy is proposed to improve the quality of the welding products. The conventional nonlinear power control system of spot welders is linearized using nonlinear feedback linearization technique based on differential geometry theory. An evolution strategy(ES) geometry is used to find optimal gain of PI controllers. It tries to find out the optimal control parameters by imitating the natural evolution. Some Simulation and experimental results show that the proposed variable power control system using ES algorithm has better dynamic performances than the conventional one.
The Vector Control of SLIM Considering End-effect
The Transactions of the Korean Institute of Power Electronics, volume 7, issue 4, 2002, Pages 395~403
The advanced space vector PWM is Implemented for the control system using high arithmetic performance microprocessor such as DSP. It is difficult to realize the complicate SLIM which is applied to SVPWM system, but widely used in vector control system or servo control system for AC motor because of its high performance in current control. In this paper, we use the dynamic characteristic analyzing method that can calculate efficiently the end effect by using equivalent circuit methode in the operating SLIM system modeling and examine the dynamic characteristics of SVPWM with PI controller.