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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 18, Issue 6 - Dec 2013
Volume 18, Issue 5 - Oct 2013
Volume 18, Issue 4 - Aug 2013
Volume 18, Issue 3 - Jun 2013
Volume 18, Issue 2 - Apr 2013
Volume 18, Issue 1 - Feb 2013
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Hall Sensor Fault Detection and Fault-Tolerant Control of High-Speed PMSM Drive System
Jang, Myung-Hyuk ; Lee, Kwang-Woon ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 205~210
DOI : 10.6113/TKPE.2013.18.3.205
This paper presents a novel hall sensor fault detection and fault-tolerant control method for a high-speed permanent magnet synchronous motor (PMSM) drive system. A phase locked loop (PLL) type position estimator is used with a conventional interpolation based rotor position estimator to reduce position errors due to misalignment of hall sensors. The expected trigger time of hall sensor's output is used for detecting hall sensor fault condition and the PLL type position estimator is reconfigured for fault-tolerant control at the hall sensor fault condition. The proposed method can minimize current ripples during the transition from sensored control using hall sensors to sensorless control. Experimental results have been proposed to prove the validity of the proposed method.
Simulation and Experiment of Dynamic Torsional Vibration during Grid Low Voltage in a PMSG Wind Power Generation System
Kwon, Sun-Hyung ; Song, Seung-Ho ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 211~216
DOI : 10.6113/TKPE.2013.18.3.211
A wind generator system model includes wind model, rotor dynamics, synchronous generator, power converter, distribution line and infinite bus. This paper investigates the low-Voltage Ride-Through capability of PMSG wind turbine in a variable speed. The drive train of a wind turbine on 2-mass modeling can observe the shaft torsional vibration when the low-voltage occur. To reduce the torsional vibration when the low-voltage occur, this paper designs suppression control algorithm of the torsional vibration and implements simulation. The simulation based on MATLAB/SIMULINK has validated at the transient state of the PMSG and an experiment using 3kW simulator has validated the LVRT control.
A Simple Open-Circuit Fault Detection Method for a Sparse Matrix Converter
Lee, Eunsil ; Lee, Kyo-Beum ; Joung, Gyu-Bum ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 217~224
DOI : 10.6113/TKPE.2013.18.3.217
This paper presents a diagnostic method for a sparse matrix converter that detects faults in any single switch or a pair of switches. The sparse matrix converter is functionally equivalent to the standard matrix converter but has a reduced number of switches. The proposed diagnostic method is based in the measurement of input and output currents. The currents have respective characteristic according to the location of faulty switches. This method not only detects the switches of open-circuit fault but identifies the location of the faulty switching devices without complicated calculations. The simulation and experimental results verify that, based on the proposed method, the fault of sparse matrix converter can be easily and fast detected.
IPMSM Sensorless Control Using Square-Wave-Type Voltage Injection Method with a Simplified Signal Processing
Park, Nae-Chun ; Kim, Sang-Hoon ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 225~231
DOI : 10.6113/TKPE.2013.18.3.225
This paper presents an improved signal processing technique in the square-wave-type voltage injection method for IPMSM sensorless drives. Since the sensorless method based on the square-wave voltage injection does not use low-pass filters to get an error signal for estimating rotor position and allows the frequency of the injected voltage signal to be high, the sensorless drive system may achieve an enhanced control bandwidth and reduced acoustic noise. However, this sensorless method still requires low-pass and band-pass filters to extract the fundamental component current and the injected frequency component current from the motor current, respectively. In this paper, these filters are replaced by simple arithmetic operations so that the time delay for estimating the rotor position can be effectively reduced to only one current sampling. Hence, the proposed technique can simplify its whole signal process for the IPMSM sensorless control using the square-wave-type voltage injection. The proposed technique is verified by the experiment on the 800W IPMSM drive system.
Improved Programmable LPF Flux Estimator with Synchronous Angular Speed Error Compensator for Sensorless Control of Induction Motors
Lee, Sang-Soo ; Park, Byoung-Gun ; Kim, Rae-Young ; Hyun, Dong-Seok ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 232~239
DOI : 10.6113/TKPE.2013.18.3.232
This paper proposes an improved stator flux estimator through ensuring conventional PLPF to act as a pure integrator for sensorless control of induction motors. Conventional PLPF uses the estimated synchronous speed as a cut-off frequency and has the gain and phase compensators. The gain and phase compensators are determined on the assumption that the estimated synchronous angular speed is coincident with the real speed. Therefore, if the synchronous angular speed is not same as the real speed, the gain and phase compensation will not be appropriate. To overcome the problem of conventional PLPF, this paper analyzes the relationship between the synchronous speed error and the phase lag error of the stator flux. Based on the analysis, this paper proposes the synchronous speed error compensation scheme. To achieve a start-up without speed sensor, the current model is used as the stator flux estimator at the standstill. When the motor starts up, the current model should be switched into the voltage model. So a stable transition between the voltage model and the current model is required. This paper proposes the simple transition method which determines the initial values of the voltage model and the current model at the transition moment. The validity of the proposed schemes is proved through the simulation results and the experimental results.
LLC Resonant Converter design for Uninterruptible Power Supply Battery Discharger
Yoo, Kwang-Min ; Kim, Seung-Joo ; Kim, Kyoung-Dong ; Park, Seung-Hee ; Byeon, Yong-Seop ; Lim, Seung-Beom ; Lee, Jun-Young ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 240~246
DOI : 10.6113/TKPE.2013.18.3.240
An Uninterruptible Power Supply(UPS) is a system designed to deliver energy during accidents that the AC mains is out of its acceptable limits, without interruption of power flow through the load. Battery Discharger is the device to supply high quality power to the Inverter, when accidents occur, such as Power Failure. The Battery Discharger should have a fast response characteristics. The LLC resonant converter for UPS battery discharger is proposed. The proposed Battery Discharger offers substantial improvements in efficiency, size and cost. The proposed Battery Discharger of UPS approach is a good solution for high power applications above KW. To verify the validity of proposed Battery Discharger, simulations and experiments are carried out.
Soft Switching DC-DC Converter for AC Module Type PV Module Integrated Converter
Youn, Sun-Jae ; Kim, Young-Ho ; Jung, Yong-Chae ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 247~255
DOI : 10.6113/TKPE.2013.18.3.247
In this paper, a soft switching DC-DC converter for AC module type photovoltaic (PV) module integrated converter is proposed. A push-pull converter is suitable for a low voltage PV AC module system because the step-up ratio of a high frequency transformer is high and the number of primary side switches is relatively small. However, the conventional push-pull converters do not have high efficiency because of high switching losses by hard switching and transformer losses (copper and iron losses) by high turns-ratio of the transformer. In the proposed converter, primary side switches are turned on at zero voltage switching (ZCS) condition and turned off at zero current switching (ZVS) condition through parallel resonance between secondary leakage inductance of the transformer and a resonant capacitor. Therefore the proposed push-pull converter decreases the switching loss using soft switching of the primary switches. Also, the turns-ratio of the transformer can be reduced by half using a voltage-doubler of secondary side. The theoretical analysis of the proposed converter is verified by simulation and experimental results.
Control Method for Reducing Circulating Current in Parallel Operation of DC Distribution System for Building Applications
Kim, Hack-Seong ; Shin, Soo-Cheol ; Lee, Hee-Jun ; Jung, Chul-Ho ; Han, Dong-Woo ; Won, Chung-Yuen ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 256~262
DOI : 10.6113/TKPE.2013.18.3.256
In the large system such DC distribution for building, the method that a number of modules converters operation in parallel is commonly used. When parallel operation, circulating current is directly related to the loss of the entire system. Accordingly, each module to share the same current is the most important for the safety of the power system. In this paper, control method for reducing circulating current in parallel operation is proposed. furthermore response and operation of steady-state with parallel system was verified by simulation and experiment results.
The Study on the One-stage PFC-flyback Converter using the Soft Switching Technique
Lee, Sang-Hyeok ; Hwang, Jung-Goo ; Park, Sung-Jun ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 263~269
DOI : 10.6113/TKPE.2013.18.3.263
The flyback converter has been applied widely in isolated DC/DC power converters because this converters employ a single MOSFET switch. The leakage inductance should be minimized for high efficiency of flyback converter. but in reality, it is very difficult. Namely, The Snubber circuit is essential to recover the leakage inductance stored energy when the switch is turn off. Flyback Converter typically operates in DCM mode and when switch is turn off in hard switching, this hard switching action results in a high power losses and switching stresses. In order to overcome these problems, a novel soft switching flyback converter using resonant snubber circuit is proposed in this paper. The resonant snubber circuit is composed of the transformer leakage inductance and a capacitor. To verify and confirm the proposed resonant snubber circuit, PSIM simulation and hardware prototype are implemented. Simulation and Experimental results indicate that the proposed resonant snubber circuit is effective.
Control of HVDC-MMC Considering the Switching Device's Current Capacity and Circulating Current under Unbalanced Voltage Conditions
Moon, Ji-Woo ; Pae, Deuk-Woo ; Park, Jung-Woo ; Kang, Dea-Wook ; Yoo, Dong-Wook ; Kim, Jang-Mok ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 270~278
DOI : 10.6113/TKPE.2013.18.3.270
This paper proposes a control method for high voltage direct current(HVDC) with modular multilevel converter (MMC) under unbalanced voltage conditions considering the submodule(SM)'s current capacity and circulating current. It is aimed to propose a control method in which the current peak value does not exceed the maximum value of HVDC-MMC by considering the current capacity of the SM under unbalance voltage conditions. And it analyzes the effect of the unbalanced voltage on circulating currents in MMC and then proposes a control method considering each component of circulating currents under unbalanced voltages. The effectiveness of the proposed controlling method is verified through simulation results using PSCAD/EMTDC.
A Speed Control Characteristics for Five-Phase Squirrel-Cage Induction Motor Injecting 3rd Current Harmonics Component
Kim, Min-Huei ; Kim, Nam-Hun ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 279~288
DOI : 10.6113/TKPE.2013.18.3.279
This paper proposes a improved speed control system for five-phase squirrel-cage induction motor(IM) injecting 3rd. current harmonic components with field oriented control (FOC) A five-phase IM drives present unique characteristics due to the additional degrees of freedom and also drives possess many others advantage compared with the traditional three-phase motor drive system, such as reducing a amplitude of torque pulsation at low frequency and increasing the reliability. In order to maximize the torque per ampere, the proposed motor has concentrated windings. The produced back-electromotive force is almost trapezoidal, and the motor is supplied with the combined sinusoidal plus third harmonic of currents. There is necessary to controlled 3rd harmonic current in order to high response characteristics. For presenting the superior performance of the proposed the speed control system, experimental results are presented using a 32-bit fixed point TMS320F2812 DSP with 1.5[kW] induction motor.
A Novel Parameter Estimation Algorithm for Interior Permanent-Magnet Synchronous Motors
Lim, Dong-Chan ; Lee, Dong-Myung ;
The Transactions of the Korean Institute of Power Electronics, volume 18, issue 3, 2013, Pages 289~295
DOI : 10.6113/TKPE.2013.18.3.289
It is important to know exact values of Interior Permanent Magnet Synchronous Motors(IPMSM)' parameters such as stator resistance and inductance in order to have their high performance. This paper proposes a novel motor parameter(stator resistance, d&q axis inductance) estimation algorithm for IPMSM. The proposed estimation method utilizes back-EMF equations and model reference adaptive system(MRAS). The algorithm using back-EMF estimates d and q axis inductances in the constant torque region, and the stator resistance is estimated by using MRAS with the estimated inductance regardless of speed regions. The validity of the proposed algorithm is verified by simulations and experiments.