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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 16, Issue 6 - Dec 2011
Volume 16, Issue 5 - Oct 2011
Volume 16, Issue 4 - Aug 2011
Volume 16, Issue 3 - Jun 2011
Volume 16, Issue 2 - Apr 2011
Volume 16, Issue 1 - Feb 2011
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Design and Stability Analysis of a Fuzzy Observer-based Fuzzy Speed Controller for a PM Synchronous Motor
Jung,, Jin-Woo ; Choi, Young-Sik ; Yu, Dong-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 1~10
DOI : 10.6113/TKPE.2011.16.1.1
This paper proposes a new fuzzy load torque observer and a fuzzy speed regulator to guarantee a robust speed control of a permanent magnet synchronous motor (PMSM). Also, the LMI conditions are given for the existence of the fuzzy load torque observer and fuzzy speed controller, and the gains of the observer and controller are calculated. The stability of the proposed control system is analytically proven. To validate the effectiveness of the proposed observer-based fuzzy speed controller, the simulation and experimental results are presented. Finally, it is definitely demonstrated that the proposed control algorithm can be used to accurately control the speed of a PM synchronous motor.
Development of Hardware Simulator for DFIG Wind Power System Composed of Anemometer and Motor-Generator Set
Oh, Seung-Jin ; Cha, Min-Young ; Kim, Jong-Won ; Jeong, Jong-Kyou ; Han, Byung-Moon ; Chang, Byung-Hoon ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 11~19
DOI : 10.6113/TKPE.2011.16.1.11
This paper describe development of a hardware simulator for the DFIG wind power system, which was designed considering wind characteristic, blade characteristic, and blade inertia compensation. The simulator consists of three major parts, such as wind turbine model using induction motor, doubly-fed induction generator, converter-inverter set. and control system. The turbine simulator generates torque and speed signals for a specific wind turbine with respect to the given wind speed which is detected by Anemometer. This torque and speed signals are scaled down to fit the input of 3.5kW DFIG. The MSC operates to track the maximum power point, and the GSC controls the active and reactive power supplied to the grid. The operational feasibility was verified through computer simulations with PSCAD/EMTDC. And the implementation feasibility was confirmed through experimental works with a hardware set-up.
Design and Control Method for Critical Load Supply Equipment using MCFC Electricity Generation Systems
Kim, Dong-Hee ; Kim, Jong-Soo ; Choe, Gyu-Yeong ; Lee, Byoung-Kuk ; Kawk, Cheol-Hoon ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 20~29
DOI : 10.6113/TKPE.2011.16.1.20
This paper proposes critical load following back-up system using MCFC stack. This system enables MCFC generation system to supply power to critical load without UPS and to generate rated power under grid fault state. This back-up system includes `Load Leveler` that is connected with 3-phase inverter and is controlled by additional algorithm that includes critical load following. The proposed system and algorithm are verified by computer simulation based on 5kW system.
Hybrid Multilevel Inverter Connecting a Full-bridge Inverter to a 5-level Inverter in Series
Hong, Un-Taek ; Choi, Won-Kyun ; Kwon, Cheol-Soon ; Kang, Feel-Soon ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 30~37
DOI : 10.6113/TKPE.2011.16.1.30
This paper presents a circuit configuration of multilevel inverter to synthesize a large number of output voltage levels by connecting a full-bridge inverter to a 5-level inverter in series. We analyze the characteristics by computer-aided simulations and experiments when it has input voltage sources which have the same and the power of three in the amplitude. In addition, it is compared with the conventional transformer based multilevel inverter.
A Study on Startup-Characteristic of Sensorless Controlled IPMSM Employing Sliding Mode Observer
Kim, Sang-Hun ; Kwon, Soon-Jae ; Kim, Marn-Go ; Jung, Young-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 38~43
DOI : 10.6113/TKPE.2011.16.1.38
This paper presents the improvement of start-up characteristic of sensorless controlled IPMSM(Interior Permanent Magnet Synchronous Motor) with SMO(Sliding Mode Observer). It is difficult to utilize the rotor position information at starting point for the back EMF estimation based sensorless control. For this reason, open loop control is normally used during start-up period. However, changing from open loop to closed loop control might bring a problem on the transient characteristics for difference load conditions. To solve this problem, we add another rotor angle controller. Simulation results and experimental results are presented to verify proposed method.
Robust Digital Speed Control Scheme of Permanent Magnet Synchronous Motor
Jung, Jin-Woo ; Choi, Young-Sik ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 44~49
DOI : 10.6113/TKPE.2011.16.1.44
This paper proposes a robust digital speed regulator for a surface-mounted permanent magnet synchronous motor(SPMSM). The proposed speed controller uses a simple digital load disturbance resistance scheme which does not require a load torque observer, so it can be easily and simply implemented without degrading the control performance. To validate the effectiveness of the proposed control algorithm, experimental results as well as simulation results are shown under motor parameter variations using a prototype SPMSM driving system. Finally, it was confirmed that the proposed method can precisely regulate the speed of the SPMSM.
Load-Sharing Algorithm using Digital Parallel Communication
Park, Seong-Mi ; Kim, Chun-Sung ; Lee, Sang-Hyeok ; Lee, Sang-Hun ; Park, Sung-Jun ; Lee, Bae-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 50~57
DOI : 10.6113/TKPE.2011.16.1.50
In this paper, we proposes a new load-sharing algorithm with a ATmega2560 based digital communication. Proposed algorithm is different from conventional analog method. The high speed communication digital control is performed. To apply the digital communication and real-time control for time-sharing token bus method, we implemented high efficient load-sharing and redundancy. Also this system make down the price by auto ID algorithm and system response is improved by controller`s voltage and current integral value sharing. In parallel system prototype, each module have controller and performed load-sharing according to master module integral value. In this paper, we verify the validity of proposed algorithm using PSIM program and prototype.
Development of Fire Control System with an Analysis of Impact Vibration and Impact Energy
Lee, Dong-Hee ; Lee, Jong-Heon ; Youn, Ju-Houc ; Park, Noh-Sik ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 58~63
DOI : 10.6113/TKPE.2011.16.1.58
This paper presents a development of a fire control system with an intelligent judgment algorithm of hit or not. The presented algorithm analyzes an impact energy and impact signals according to impact materials. And the detected signals are used to judge the correct hit or not. Furthermore, Zigbee wireless communication technology is applied in the developed fire control system. The wireless communication technology can supply a simple installation of the practical system and free from ageing of communication wire. The presented system is verified in the practical fire test, and the results show the effectiveness of the development system.
Zero-Transient Current Control Method for PWM Dimming of LED
Yoon, Young-Nam ; Lee, Sang-Hyun ; Cho, Sang-Ho ; Hong, Sung-Soo ; Kim, Chang-Sub ; Lee, Hyo-Bum ; Han, Sang-Kyoo ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 64~70
DOI : 10.6113/TKPE.2011.16.1.64
This paper presents a zero-transient current control method for PWM dimming of LED. Since the proposed LED current control method has no transient state, it features a high resolution, high linearity, and no current overshoot through LED along a wide dimming range. The operational principles of the proposed LED current control circuit are presented. To confirm the validity of the proposed method experimental results from a prototype circuit of the 46-inch LCD TV are given.
Effects of Parameter Errors on Sensorless Operation of PMSM
Park, Yong-Soon ; Sul, Seung-Ki ; Ji, Jun-Keun ; Park, Young-Jae ; Lee, Dong-Hwan ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 71~78
DOI : 10.6113/TKPE.2011.16.1.71
In this paper, the effect of parameter errors to the estimation of the rotor angle in sensorless operation of a permanent magnet synchronous motor is analyzed. The angle error information which is utilized to estimate the rotor position can be classified into two factors, namely, the sign factor and the gain factor. This paper particularly focuses on parameter errors reflected in the sign factor of the angle error information which causes a deviation in the angle estimation. In this paper, mathematical expressions describing the deviation of the angle estimation due to the inductance error and the resistance error in the sensorless control are derived. The validity of the expression is verified by the computer simulations and the experimental results.
A Study on the Fault Detection Technique of the Grid-Connected Photovoltaic System using Wavelet Transformation
Lee, Jeong-Eun ; Kim, Il-Song ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 79~87
DOI : 10.6113/TKPE.2011.16.1.79
The fault detection technique of the grid-connected photovoltaic system using wavelet transform has been suggested in this paper. The additional hardware and sensors are required to detect the inverter failure in the conventional method, and it has the disadvantage of high cost and re-design problem if the inverter specification has been changed. The suggested method used the inverter voltage and current waveform to detect the failure and the location by the wavelet coefficients variations. The prompt and accurate diagnostic function is possible using the normalized standard deviation method. The merit of the proposed method is the simple calculation and precise diagnostic capabilities of the fault detection. The computer simulation is performed and the experimental result verifies the validity of the proposed method.
Stable Standby-mode Implementation of Multi-output Power Supply using a New Load Current Estimation Technique with Linear Regulator
Lee, Jong-Hyun ; Jung, An-Yeol ; Kim, Dong-Joon ; Park, Joung-Hu ; Jeon, Hee-Jong ;
The Transactions of the Korean Institute of Power Electronics, volume 16, issue 1, 2011, Pages 88~95
DOI : 10.6113/TKPE.2011.16.1.88
In this paper, a new standby-mode control method for multiple output switching-mode power-supply is suggested, which uses the control signal of the feedback compensator of the inner loop in the linear voltage regulator located at the transformer secondary side, as the load current information. Conventional method has a problem that standby mode occurs depending only on the load condition of the main controller output, which makes the other secondary side output very inaccurate by burst mode operation. The proposed method detects all the load current information and operates in burst mode only when the all of them are light load condition. Minimum of the additional components are required for the implementation of the proposed method because the load information is obtained from the existing feedback circuit of the post-stage linear regulator. In this paper, the operating principles of the proposed standby-mode circuit are presented with an numerical analysis, and are verified by 25W hardware prototype implementation.