Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
The Transactions of the Korean Institute of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
Editor in Chief :
Volume & Issues
Volume 10, Issue 6 - Dec 2005
Volume 10, Issue 5 - Oct 2005
Volume 10, Issue 4 - Aug 2005
Volume 10, Issue 3 - Jun 2005
Volume 10, Issue 2 - Apr 2005
Volume 10, Issue 1 - Feb 2005
Selecting the target year
A Stability Estimation Method of HVDC System Using Reduced Model
Kim Chan-Ki ; Lim Seong-Joo ; Choo Jin-Boo ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 1~12
This paper deals with the HVDC stability according to controller types and control modes. From the viewpoint of controllers, the HVDC system which has PI, PD and PID, is designed considering the system response and stability. Also the HVDC system consists of multi-control modes like voltage control, current control and alpha control. Therefore, the HVDC stability analysis have to consider the above control modes and controller types. In this paper, the reduced model of HVDC control is analyzed in PSS/E(Power System Simulation/Engineering) and PSCAD/EMTDC.
Algorithm for the Initial Pole Position Estimation of Permanent Magnet Linear Synchronous Motor
Yun Won-Eel ; Lee Young-Ho ; Choi Jong-Woo ; Kim Heung-Geun ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 13~20
This paper has proposed an algorithm for the initial pole position estimation of a permanent magnet linear synchronous motor(PMLSM). The algorithm finds the initial pole position observing the maximum values of a position generated by the new proposed two reference frames for the same force input. So, the proposed algorithm does not utilize the motor parameters and is insensitive to them. Moreover, the proposed algorithm is easily realized because the proposed method is just using PI controller
A Suggestion of New MPPT Algorithm in the PV system
Lee Kyungsoo ; Jung Youngseok ; So Junghun ; Yu Gwonjong ; Choi Jaeho ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 21~28
As the maximum power operating point(MPOP) of the Photovoltaic(PV) power systems alters with changing atmospheric conditions, the efficiency of maximum power point tracking(MPPT) is important in PV power systems. Many MPPT techniques have been considered in the past, but techniques using microprocessors with appropriate MPPT algorithms are favored because of their flexibility and compatibility with different PV arrays. In this paper, the author analyzes and studies two MPPT algorithms, which is named P&O(Perturbation and Observation) and IncCond(Incremental Conductance). Also, the author proposes Hysterisis-band alteration algorithm. To show the excellency of new Hysterisis-band alteration, the author suggests three references; 1) Comparing three MPPT algorithms in the steady-state condition, 2) Representing irradiation variation rapidly, 3) Showing MPPT efficiency. MPPT simulation and experiment perform in the boost converter.
Tuning-free Anti-windup Strategy for High Performance Induction Machine Drives
Seok Jul-Ki ; Lee Dong-Choon ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 29~37
This paper presents a tuning-free conditional integration anti-windup strategy for induction machine with Proportional-Integral(PI) type speed controller. The on/off condition of integral action is determined by the frequency domain analysis of machine torque command without a prior knowledge of set-point changes. There are no tuning parameters to be selected by users for anti-windup scheme. In addition, the dynamic performance of the proposed scheme assures a desired tracking response curve with minimal oscillation and settling time even in the change of operating conditions. This algorithm is useful in many high performance induction machine applications not to allow the oscillation and overshoot of speed/torque responses. The main idea can be extended to general applications such as chemical processes and industrial robots.
A Study on the Space Vector PWM Inverter without Dead Time
Seo Il-Soo ; Song Eui-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 38~44
In a voltage source inverter, the dead time is necessary to prevent short circuits in the dc link. The dead time effect appears as a distortion of output voltages and currents. In recent years, the dead time compensation methods have been investigated in many literatures. This paper presents not the dead time compensation by sensing and calculation but the dead time elimination. The proposed inverter system doesn't need to sense load current and to calculate dead time. Adding some transformers to each leg, dead times in the inverter system are eliminated automatically. The proposed method is analyzed on each mode and verified through simulation results.
The Rotor Position Estimation Techniques of an SRM with Built-in Search Coils at Standstill
Yang Hyong-Yeol ; Shin Duck-Shick ; Lim Young-Cheol ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 45~51
This paper presents a comparison of rotor position estimation of a switched reluctance motor(SRM) with built-in search coils by three methods. The search coil EMFs are not generated in the SRM with built-in search coils at standstill. So an initial rotor position estimation method is needed. In this paper squared euclidean distance, fuzzy logic and neural network methods we proposed for the estimation of initial rotor position. The simulated results of the three methods are compared. The simulated result of the squared euclidean distance method, which has the best performance, is supported by the experimental result.
Observation and Compensation of Voltage Distortion of PWM VSI for PMSM using Adaptive Control Method
Kim Hag-Wone ; Youn Myung-Joong ; Kim Hyun-Soo ; Cho Kwan-Youl ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 52~60
Generally, a voltage difference or voltage distortion exists between the reference voltage and the practical voltage applied to a motor in a pulse width modulated(PWM) voltage source inverter(VSI). This voltage distortion varies with the operating conditions such as the temperature, DC link voltage, and phase current level. Also the voltage distortion affects the machine current distortion, torque pulsations, and control performance. In this paper, the voltage distortion in a PWM VSI is analyzed and a new on-line estimation method based on the model reference adaptive system(MRAS) is proposed to compensate the time varying voltage distortion, while considering the parameter variations for a permanent magnet synchronous motor (PMSM). The simulation and experimental results show the effectiveness of the proposed voltage difference observer and the compensation method.
Control Method of NPC Inverter for the Continuous Operation under One Phase Fault Condition
Park Geon-Tae ; Kim Tae-Jin ; Kang Dae-Wook ; Hyun Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 61~69
The topology of NPC inverter coupled with the large number of devices used increases the probability of device failure. It's necessary to develop an optimal remedial strategy which can be used to continue the application when fault occurs. The fault tolerance is obtained by the use of the proposed method. The proposed method utilizes that the one phase load with the failed power device could be connected to the center-tap of the DC-link capacitor in order to dc-link voltage with balance and the sinusoidal phase current with constant amplitude under the single power device fault condition. The strategy described in this paper is expected to provide an economic alternative to more expensive redundancy techniques.
Analysis of Operational Modes of Charger using Low-Voltage AC Current Source considering the Effects of Parasitic Components
Chung Gyo-Bum ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 70~77
A new converter to transfer energy from a low-voltage AC current source to a battery is proposed. It is focused to find operational modes of the converter. The low-voltage AC current source is an equivalent of the piezoelectric generator, which converts the mechanical energy to the electric energy. The converter consists of a full-bridge MOSFET rectifier and a MOSFET boost converter in order to make the converter small and efficient. The operational principle and modes of the converter are investigated with the consideration of effects of the parasitic capacitances of MOSFETs and diode. The results are proved with simulation studies using PSIM and Pspice.
Fuel Cell Generation Systems with Active Clamp Current fed Half Bridge Converter
Jang S. J. ; Kim J. T. ; Lee T. W. ; Lee B. K. ; Won C. Y. ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 78~86
Recently, a fuel cell with low voltage and high current output characteristics is remarkable for new generation system. It needs both a dc-dc boost converter and dc-ac inverter to be used in fuel cell generation system. Therefore, this paper presents dc-dc active clamp current-fed half-bridge converter with ZVS for fuel cell generation system. The proposed converter has outstanding advantages over the conventional dc-dc converters with respect to high efficiency and high component utilization. The Fuel Cell generation system consist of active clamp current-fed half-bridge converter to boost the Fuel Cell(PEMFC) voltage(28∼43[Vdc]) to 380[Vdc]. A single phase full-bridge inverter is implemented to produce 220[Vac], 60[Hz] AC outputs.
A Study on Novel Hybrid Type Encoder Design for the Position Control with the High-resolution
Cho S. E. ; Lee S. H. ; Song S. G. ; Park S. J. ; Kwon S. J. ; Kim C. U. ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 87~94
This paper is about the compensation of phase angle error and amplitude difference in stationary 2 pole coordinates by the installation variation of sensor at low cost high resolution digital hybrid encoder. To solve the problem of amplitude difference at the existing hybrid encoder, we normalized the relative magnitude of the two analog signals. and also to solve the problem of installation variation when installed the sensor, we rotate the stationary 2 pole coordinates to compensate the location error of sensor. and we used and tested the QEP function and A/D port in DSP(TMS320F2812) to verify the mentioned proposed method.
Reducing Switching Device of the HBML Inverter using the Transformers
Lee H.C ; Lee S.H. ; Song S.G. ; Cho S.E. ; Park S.J. ; Lee M.H ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 95~101
In this paper, we proposed the electric circuit using one common arm of H-Bridge Inverters to reduce the number of switching component in multi-level PWM inverter combined with H-Bridge Inverters and Transformers. and we proposed the switching method that can be same rate of usage at each transformer. Also, we tested the proposed prototype inverter to clarify the proposed electric circuit and reasonableness of control signal.
Voltage Sag-Swell Generator for Power Quality Disturbance of Dynamic UPS System
Byeon W. Y. ; Kim J. W. ; Lee K. S. ; Nho E. C. ; Kim I. D. ; Chun T. W. ; Kim H. G. ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 1, 2005, Pages 102~107
This paper describes a new voltage sag-swell generator for the test of custom power devices such as UPS, DVR, DSTATCOM, SSTS, etc. Voltage sag, swell, outage, and unbalance generation mechanism and the operating principle are described for the proposed scheme. The usefulness of the scheme is proved through simulations and experiments. The proposed scheme has good features of simple structure, high reliability, wide range of sag and swell variation, and easy control. Especially, the scheme can provide a cost-effective implementation of a power quality disturbance generator. Therefore, it is expected that the scheme will contribute to the self implementation of the system with low cost in laboratory.