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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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The Korean Institute of Power Electronics
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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
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Sensorless Control for Linear Compressors
Kim Gyu-Sik ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 421~427
A closed-loop sensorless stroke control system for a linear compressor has been designed. The motor parameters are identified as a function of the piston position and the motor current. They are stored in ROM table and used later for the accurate estimation of piston position. Also it was attempted to approximate the identified motor parameters to the 2nd-order surface functions. Some experimental results are given in order to show the feasibility of the proposed control schemes for linear compressors.
A Control Method of Bidirectional DC-DC Converter for Fuel Utilization and Durability Improvement in Fuel Cell Vehicles
Jo, Jin-Sang ; Jung, Sang-Min ; Lee, Jin-Hee ; Han, Soo-Bin ; Choi, Se-Wan ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 428~435
In this paper a power controller is proposed to accurately control the commanded power for charge and discharge operation of a bidirectional DC-DC converter so that durability is improved in hybrid systems such as fuel cell vehicles. Also, a control algorithm for charge and discharge operation is proposed to improve fuel utilization and keep battery SOC constant so that energy is effectively utilized.
Inertia Identification Algorithm for High Performance Speed Control of Electric Motor
Lee Sang-Cheol ; Kim Heung-Geun ; Choi Jong-Woo ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 436~442
This paper proposes an estimation algorithm to find the moment of inertia, which is essential to design high performance controller for motor drive system. The algorithm finds the moment of inertia observing the position error signal, which contains an error information of moment of inertia, generated by speed observer. Moreover, the proposed algorithm is easily realized in the observer-based speed detection method. The simulation and experimental results are also presented to confirm the performance of moment of inertia estimation method, which shows that the moment of inertia converges to the actual value within several seconds. The speed control responses and the designed speed controller performance match well.
Parallel Operation Systems of Z-Source Inverters for Fuel Cell Systems
Moon Hyun-Wook ; Jeong Eun-Jin ; Kim Yoon-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 443~449
In this paper, parallel operation systems with Z-source Inverters for the fuel cell systems are discussed. The carrier phase shifted SPWM(Sinusoidal Pulse Width Modulation) has an advantage in reducing harmonics of output current. However when this technique applies in parallel operation of Z-source inverters, it additionally produces circulating currents. The circulating current is analyzed and a method to prevent the circulating current is applied to the parallel operation systems of Z-source inverters. To maintain high performance with reduced circulating current in inverter output and low harmonic components in load current, circulating current reactors are used. The proposed approach is verified through simulation and experiment.
New 60-Step Inverter System for Medium-to-Large Scale STATCOM
Kim Kiyong ; Kim Taehoon ; Bae Youngsang ; Choi Sewan ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 450~456
In this paper new 60-step inverter system for medium-to-large scale STATCOM is proposed and operating principle along with control method is detailed. A simple auxiliary circuit is employed to Improve output voltage waveform of 12-step into 60-step. The proposed scheme could be a cost effective approach in high power application such as 10Mvar to 30Mvar STATCOM. Experimental results from a 2KVA laboratory prototype show validity of the proposed method.
A Study on the Characteristics of New Frequency Controller According to Changing the Frequency Measurement Position of HVDC System
Kim Chan-Ki ; Han Byoung-Sung ; Park Jong-Kwang ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 457~467
This paper deals with the new frequency controller of the HVDC scheme linking Haenam to Cheju Island. The primary aim of the study is to develop and evaluate a new frequency controller after the removing of the present synchronous compensators. The simulation methods are the mix of PSCAD/EMTDC and PSS/E, the main system studies are done for the transient state analysis using PSCAD/EMTDC. The study cases are completed involving 3 phase, single phase trip and load tripping events and study plots presented. In conclusion, the new frequency measurement from the AC network gives effective frequency control and dynamic performance.
Mechanical Parameter Identification of Servo Systems using Robust Support Vector Regression
Cho Kyung-Rae ; Seok Jul-Ki ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 468~480
The overall performance of AC servo system is greatly affected the uncertainties of unpredictable mechanical parameter variations and external load disturbances. To overcome this problem, it is necessary to know different parameters and load disturbances subjected to position/speed control. This paper proposes an on-line identification method of mechanical parameters/load disturbances for AC servo system using support vector regression(SVR). The experimental results demonstrate that the proposed SVR algorithm is appropriate for control of unknown servo systems even with time-varying/nonlinear parameters.
Development a High-Efficiency Induction Heating Heater using a 5[kW] Class Full-Bridge High Frequency Resonant Inverter
Kwon Hyuk-Min ; Shin Dae-Cheul ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 481~487
Proposed induction-heated system is innovative system which applied special high-frequency power circuit technique for thermal converse technique and IH(Induction-Heating) magnetic induction heating generated from induction-heated metallic package that is for distillation unit. In this occurs not burning, so that the working environment can be improved. This electromagnetic induction heating technique is used high frequency inverter, By using high frequency inverter high frequency alternative current in the range of [kHz] can be made with conventional alternative current. In this contribution IGBT module is used for high frequency inverter. This paper proposes new fluid heating method. Which is operated as follows. Working coil, which is wrapped outside of pipeline, makes the eddy current. Inside of heating vessel in isolated pipeline the specially designed stainless metallic package is inserted, which can be heated by eddy current losses. And then In this paper are discussed action analysis and characteristics analysis of 5[kW] class full-bridge resonant inverter system and resonant metallic package. In addition, by using this system, how high-efficiency heater is developed and application of system are also discussed.
Rotor Position Detection and Drive of a Single Phase Switched Reluctance Motor Using a Search Coil
Yang Hyong-Yeol ; Lim Young-Cheol ; Kim Kwang-Heon ; Cha Deuk-Keun ; Shin Duck-Shick ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 488~493
This paper presents a method of detecting rotor position for single phase Switched Reluctance Motors(SRMs) using a search coil. In the single phase SRM, mainly Hall effect sensors or photo interrupters have been used to detect the rotor position. But these sensors have many disadvantages. In this paper, low cost and robust characteristics of rotor position detection method are focused in order to compensate for disadvantage of existing sensors. Search coils wound around the stator pole are used for detection of the rotor position in single phase SRM. Rotor position detection is achieved through electromotive force patterns induced by time-varying flux linkage in the search coil. The simulation and experimental results are presented to verify the performance of the proposed method in this paper.
A Control Strategy for Flywheel Energy Storage / Recovery System with Induction Machine
Son Jang-Kyung ; Lee Hong-Hee ; Nho Eui-Cheol ; Kim Heung-Gun ; Chun Tae-Won ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 494~500
The paper proposed a control strategy for flywheel energy/recovery system with induction machine at the dynamic UPS system using the flywheel stored mechanical energy. The performances for the vector controlled induction generator are compared with those for the induction generator using slip control method. The strategy to improve the transient responses for dc link capacitor voltage is suggested at the transition from the motoring mode to the generating mode. The strategy Proposed by the paper is verified with experiment results using 32bit DSP.
Power Spectra of the Hybrid Random PWM(HRPWM) Technique Adopting a Random Triangular Carrier
Kim Ki-Seon ; Lim Young-Cheol ; Park Sung-Jun ; Kim Kwang-Heon ; Jung Young-Gook ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 501~507
This paper proposes a Hybrid Random PWM(HRPWM) technique using a LF2407 DSP board in order to spread the power spectra of an induction motor. The proposed method is composed to the PRBS (Pseudo-Random Binary Sequence) with the Lead-Lag random bit and the random triangular carrier for the logical comparison. Also, a DSP generates the random number, the PRBS and the three-phase reference signal, a MAX038 chip operating as frequency modulator generates the random triangular carrier. For verification of the proposed method, the experiments were conducted with a three-phase adjustable speed a.c drives, and the results of simulations and experiments are presented.
Advanced Synchronous Reference Frame Controller for three-Phase UPS Powering Unbalanced and Nonlinear Loads
Hyun Dong-Seok ; Kim Kyung-Hwan ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 508~517
This paper describes a high performance voltage controller for 3-phase 4-wire UPS (Uninterruptible Power Supply) system, and proposes a new scheme of synchronous reference frame controller in order to compensate for the voltage distortions due to unbalanced and nonlinear loads. Proposed scheme can eliminate the negative sequence voltage component due to unbalanced loads and also reduce the harmonic voltage component due to non-linear loads, even when the bandwidth of voltage control loop is a very low. In order to compensate for the effects of unbalanced loads, the synchronous reference frame controller with the positive and negative sequence computation block is proposed, and the synchronous frame controller with a bandpass filter is proposed to compensate for the selected harmonic frequency of output voltage. The effectiveness of the proposed scheme has been investigated and verified through computer simulations and experiments by a 30kVA UPS.
A New ZVZCS Converter Applicable to Majority and Minority Carrier Devices
Ahn Hee-Wook ; Kim Hack-Sung ;
The Transactions of the Korean Institute of Power Electronics, volume 10, issue 5, 2005, Pages 518~525
The paper proposes a novel ZVZCS PWM converter. It enables the main switch to be turned on/off with both zero voltage and zero current, the auxiliary switch to be turned on/off with ZCS, the rectifier diode to be turned on/off with ZVS. Moreover, this proposed soft switching technique is suitable for not only minority carrier device but also majority carrier semiconductor device. Since auxiliary resonant circuit of the proposed boost converter is placed out of the main power path, therefore, there are no voltage and current stresses on the main switch and diode. The operation of the proposed boost converter is explained and analyzed theoretical and experimentally, from a prototype operating at 100KHz.