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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Power Electronics
Journal Basic Information
Journal DOI :
The Korean Institute of Power Electronics
Editor in Chief :
Volume & Issues
Volume 11, Issue 6 - Nov 2011
Volume 11, Issue 5 - Sep 2011
Volume 11, Issue 4 - Jul 2011
Volume 11, Issue 3 - May 2011
Volume 11, Issue 2 - Mar 2011
Volume 11, Issue 1 - Jan 2011
Selecting the target year
A Trade-Off between the Efficiency, Ripple and Volume of a DC-DC Converter
Taherbaneh, Mohsen ; Rezaie, Amir H. ; Ghafoorifard, Hasan ; Mirsamadi, Maddad ; Menh, Mohammad B. ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 621~631
DOI : 10.6113/JPE.2011.11.5.621
In space qualified DC-DC converters, optimization of the following electrical characteristics is of greater interest in comparison with other specifications; power loss/efficiency, output voltage ripple and volume/weight. The main goal of this paper is to present an appropriate solution for optimizing the above mentioned characteristics. For this purpose, a comprehensive power loss model of a DC-DC converter is fully developed. Proper models are also demonstrated for assessment of the output voltage ripple and the utilized transformer volume as the bulkiest component in a DC-DC converter. In order to provide a test bed for evaluation of the proposed models, a 50W push-pull DC-DC converter is designed and implemented. Finally, a novel cost function with three assigned weight functions is proposed in order to have a trade-off among the power loss, the output voltage ripple and the utilized transformer volume of the converter. The cost function is optimized for applications in which volume has the highest priority in comparison with power loss and ripple. The optimization results show that the transformer volume can be decreased by up to 51% and this result is verified by experimental results. The developed models and algorithms in this paper can be used for other DC-DC converter topologies with some minor modifications.
A Current-Fed Parallel Resonant Push-Pull Inverter with a New Cascaded Coil Flux Control for Induction Heating Applications
Namadmalan, Alireza ; Moghani, Javad Shokrollahi ; Milimonfare, Jafar ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 632~638
DOI : 10.6113/JPE.2011.11.5.632
This paper presents a cascaded coil flux control based on a Current Source Parallel Resonant Push-Pull Inverter (CSPRPI) for Induction Heating (IH) applications. The most important problems associated with current source parallel resonant inverters are start-up problems and the variable response of IH systems under load variations. This paper proposes a simple cascaded control method to increase an IH system's robustness to load variations. The proposed IH has been analyzed in both the steady state and the transient state. Based on this method, the resonant frequency is tracked using Phase Locked Loop (PLL) circuits using a Multiplier Phase Detector (MPD) to achieve ZVS under the transient condition. A laboratory prototype was built with an operating frequency of 57-59 kHz and a rated power of 300 W. Simulation and experimental results verify the validity of the proposed power control method and the PLL dynamics.
Sliding Mode Control for Current Distribution Control in Paralleled Positive Output Elementary Super Lift Luo Converters
Kumar, Kuppan Ramash ; Jeevananthan, Seenithangam ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 639~654
DOI : 10.6113/JPE.2011.11.5.639
This paper presents a Current Distribution Control design for Paralleled Positive Output Elementary Super Lift Luo Converters (PPOESLLCs) operated in Continuous Conduction Mode using a Sliding Mode Controller (SMC). Manipulating the higher current requirement of the load through the paralleling of POESLLCs, results in a current inequality. This is mainly due to dissimilarities in the power semiconductor switches and circuit components used in POESLLCs, which may lead to converter failures. In order to balance the proper load current sharing and the load voltage regulation of PPOESLLCs, a SMC is developed. The SMC is designed for the inherently variable-structured of POESLLCs by using the state-space average based model. The static and dynamic performance of the developed controller with PPOESLLCs is validated for its robustness to perform over a wide range of operating conditions through both a laboratory prototype and MatLab/Simulink models, which are compared with a Proportional-Integral (PI) controller. Theoretical analysis, simulation and experimental results are presented to demonstrate the feasibility of the developed SMC along with the complete design procedure.
Single-Stage Double-Buck Topologies with High Power Factor
Pires, Vitor Fernao ; Silva, Jose Fernando ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 655~661
DOI : 10.6113/JPE.2011.11.5.655
This paper presents two topologies for single-stage single-phase double-buck type PFC converters, designed to operate at high power factor, near sinusoidal input currents and adjustable output voltage. Unlike the known buck type PFC topologies, in which the output voltage is always lower than the maximum input voltage, the proposed converters can operate at output voltages higher than the ac input peak voltage. A reduced number of switches on the main path of the current are another characteristic of the two proposed topologies. To shape the input line currents, a fast and robust controller based on a sliding mode approach is proposed. This active non-linear control strategy, applied to these converters allows high quality input currents. A Proportional Integral (PI) controller is adopted to regulate the output voltage of the converters. This external voltage controller modulates the amplitude of the sinusoidal input current references. The performances of the presented rectifiers are verified with experimental results.
Analysis of an LCLC Resonant Converter with a Capacitive Output Filter
Jafarboland, Mehrdad ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 662~668
DOI : 10.6113/JPE.2011.11.5.662
This paper presents an analysis of a 4th order LCLC resonant converter with a capacitive output filter using the state-space approach. The analysis of the converter shows that there are four intervals in a half period. In each interval, the state-space equations are obtained. Due to the soft switching of the converter, an exact equation for the Zero Voltage Switching (ZVS) time and the maximum dead time of the inverter switches are presented. The simulation and experimental results obtained from a 10kv, 370w prototype confirm the validity of the theoretical analysis.
Polarity Inversion DC-DC Power Conversion Circuit with High Voltage Step-up Ratio
Roh, Chung-Wook ; Yoo, Cheol-Hee ; Jung, Dong-Yeol ; Sak, Sug-Chin ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 669~676
DOI : 10.6113/JPE.2011.11.5.669
A novel polarity inversion dc-dc power conversion circuit that features the high input to output step-up voltage conversion ratio characteristics is presented for high voltage DC power supply applications. The proposed circuit features the reduced voltage stresses of the components compared to those of the conventional ones. The operational principles of the proposed circuit are analyzed and comparative features are presented. The simulation results and experimental results are presented to verify the validity of the proposed circuit.
Analysis and Design of a Bidirectional Cycloconverter-Type High Frequency Link Inverter with Natural Commutated Phase Angle Control
Salam, Zainal ; Lim, Nge Chee ; Ayo, Shahrin Md. ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 677~687
DOI : 10.6113/JPE.2011.11.5.677
In this paper a cycloconverter-type high frequency transformer link inverter with a reduced switch count is analyzed and designed. The proposed topology consists of an H-bridge inverter at the transformer's primary side and a cycloconverter with three bidirectional switches at the secondary. All of the switches of the cycloconverter operate in non-resonant zero voltage and zero current switching modes. To overcome a high voltage surge problem resulting from the transformer leakage inductance, phase angle control based on natural commutation is employed. The effectiveness of the proposed inverter is verified by constructing s 750W prototype. Experimentally, the inverter is able to supply a near sinusoidal output voltage with a total harmonic distortion of less than 1%. For comparison, a PSpice simulation of the inverter is also carried out. It was found that the experimental results are in very close agreement with the simulation.
Simple Space Vector PWM Scheme for 3-level NPC Inverters Including the Overmodulation Region
Lee, Dong-Myung ; Jung, Jin-Woo ; Kwa, Sang-Shin ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 688~696
DOI : 10.6113/JPE.2011.11.5.688
This paper proposes a simple space vector PWM (SVPWM) scheme including overmodulation operation for 3-level NPC (Neutral Point Clamped) Inverters. The proposed scheme features a simple decision and calculation procedure for determining switching times in the overmodulation range by utilizing the duty calculation method used in 2-level inverters and the minimum phase error projection method widely employed in motor drive systems. The proposed scheme does not need to detect the angle of the reference vector or calculate trigonometric functions to determine the magnitude of the voltage vector. The magnitude of the angle of the new reference voltage vector is decided in advance with the help of the Fourier Series Expansion to extend the linearity of the output voltage of 3-level inverters in the overmodulation region. Experimental results demonstrate the validity of the proposed SVPWM scheme including overmodulation operation for 3-level NPC inverters.
End-Effect Compensation in Linear Induction Motor Drives
Satvati, Mohammad Reza ; Vaez-Zade, Sadegh ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 697~703
DOI : 10.6113/JPE.2011.11.5.697
In this paper a control system with a high performance dynamic response for linear induction motors (LIMs) is proposed which takes into account the end-effect in both the machine model and the control system. Primary flux oriented control has two major drawbacks i.e. a lack of decoupling of the thrust and the flux and a possibility of system instability due to the end-effect. Both of these drawbacks have been dealt with in this paper. A flux estimation method is proposed to correct the flux orientation error caused by the end effect. Extensive motor performance evaluations under the proposed control system prove its superiority over conventional vector control.
A Hybrid DTC-DSC Drive for High Performance Induction Motor Control
Jidin, Auzani ; Idris, Nik Rumzi Nik ; Yatim, Abdul Halim Mohamed ; Sutikno, Tole ; Elbuluk, Malik E. ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 704~712
DOI : 10.6113/JPE.2011.11.5.704
This paper describes a hybrid induction motor drive system incorporating DTC-hysteresis and Direct Self Control (DSC) schemes to achieve excellent dynamic performance. The control scheme is switched from a circular to a hexagonal flux locus whenever a dynamic condition is encountered. On the other hand, when the motor operates under steady state conditions, a circular flux locus is used. Without major modifications to the simple structure of a basic DTC, hexagonal flux locus operation is established by modifying the flux error status, before it is fed to the look-up table. The feasibility of the proposed hybrid scheme to achieve excellent control performance is verified by experimental results.
Online Compensation of Parameter Variation Effects for Robust Interior PM Synchronous Motor Drives
Shrestha, Rajendra L. ; Seok, Jul-Ki ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 713~718
DOI : 10.6113/JPE.2011.11.5.713
This paper presents an online voltage disturbance estimator to achieve precise torque control of IPMSMs over a high speed operating region. The proposed design has a type of state-filter based on a Luenburger-style closed loop stator current vector observer. Utilizing the frequency response plot (FRF) approach, the estimation accuracy and the parameter sensitivities are analyzed. Accurate torque control and improved efficiency are provided with the decoupling of the effect of the parameter variations. The feasibility of the presented idea is verified by laboratory experiments.
Robust DTC Control of Doubly-Fed Induction Machines Based on Input-Output Feedback Linearization Using Recurrent Neural Networks
Payam, Amir Farrokh ; Hashemnia, Mohammad Naser ; Fai, Jawad ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 719~725
DOI : 10.6113/JPE.2011.11.5.719
This paper describes a novel Direct Torque Control (DTC) method for adjustable speed Doubly-Fed Induction Machine (DFIM) drives which is supplied by a two-level Space Vector Modulation (SVM) voltage source inverter (DTC-SVM) in the rotor circuit. The inverter reference voltage vector is obtained by using input-output feedback linearization control and a DFIM model in the stator a-b axes reference frame with stator currents and rotor fluxes as state variables. Moreover, to make this nonlinear controller stable and robust to most varying electrical parameter uncertainties, a two layer recurrent Artificial Neural Network (ANN) is used to estimate a certain function which shows the machine lumped uncertainty. The overall system stability is proved by the Lyapunov theorem. It is shown that the torque and flux tracking errors as well as the updated weights of the ANN are uniformly ultimately bounded. Finally, effectiveness of the proposed control approach is shown by computer simulation results.
Novel PWM Method with Low Ripple Current for Position Control Applications of BLDC Motors
Kim, Hag-Wone ; Shin, Hee-Keun ; Mok, Hyung-Soo ; Lee, Yong-Kyun ; Cho, Kwan-Yuhl ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 726~733
DOI : 10.6113/JPE.2011.11.5.726
BLDC Motors are widely used in various speed control applications due to their ease of control and low cost. Generally, the unipolar PWM method is used for speed control applications. However, the unipolar PWM method has a current spike problem in the braking operation which can be a problem in speed reversal which generally happens in position control applications. However, the current spike problem can be solved by the conventional bipolar PWM method. Although the current spike problem can be solved, the conventional bipolar PWM method has the problem of a large current ripple. In this paper, a novel bipolar PWM method is proposed to solve this problem. The current ripple and the current spike problems are analyzed in this paper for the unipolar and bipolar PWM methods. At last, the merits of the proposed bipolar PWM method are proven by experiment.
Combined Design of PSS and STATCOM Controllers for Power System Stability Enhancement
Rohani, Ahmad ; Tirtashi, M. Reza Safari ; Noroozian, Reza ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 734~742
DOI : 10.6113/JPE.2011.11.5.734
In this paper a robust method is presented for the combined design of STATCOM and Power System Stabilizer (PSS) controllers in order to enhance the damping of the low frequency oscillations in power systems. The combined design problems among PSS and STATCOM internal ac and dc voltage controllers has been taken into consideration. The equations that describe the proposed system have been linearized and a Fuzzy Logic Controller (FLC) has been designed for the PSS. Then, the Particle Swarm Optimization technique (PSO) which has a strong ability to find the most optimistic results is employed to search for the optimal STATCOM controller parameters. The proposed controllers are evaluated on a single machine infinite bus power system with the STATCOM installed in the midpoint of the transmission line. The results analysis reveals that the combined design has an excellent capability in damping a power system's low frequency oscillations, and that it greatly enhances the dynamic stability of power systems. Moreover, a system performance analysis under different operating conditions and some performance indices studies show the effectiveness of the combined design.
Sensorless Passivity Based Control of a DC Motor via a Solar Powered Sepic Converter-Full Bridge Combination
Linares-Flores, Jesus ; Sira-Ramirez, Hebertt ; Cuevas-Lopez, Edel F. ; Contreras-Ordaz, Marco A. ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 743~750
DOI : 10.6113/JPE.2011.11.5.743
This article deals with the sensor-less control of a DC Motor via a SEPIC Converter-Full Bridge combination powered through solar panels. We simultaneously regulate, both, the output voltage of the SEPIC-converter to a value larger than the solar panel output voltage, and the shaft angular velocity, in any of the turning senses, so that it tracks a pre-specified constant reference. The main result of our proposed control scheme is an efficient linear controller obtained via Lyapunov. This controller is based on measurements of the converter currents and voltages, and the DC motor armature current. The control law is derived using an exact stabilization error dynamics model, from which a static linear passive feedback control law is derived. All values of the constant references are parameterized in terms of the equilibrium point of the multivariable system: the SEPIC converter desired output voltage, the solar panel output voltage at its Maximun Power Point (MPP), and the DC motor desired constant angular velocity. The switched control realization of the designed average continuous feedback control law is accomplished by means of a, discrete-valued, Pulse Width Modulation (PWM). Experimental results are presented demonstrating the viability of our proposal.
Design and Implementation of a Robust Predictive Control Scheme for Active Power Filters
Han, Yang ; Xu, Lin ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 751~758
DOI : 10.6113/JPE.2011.11.5.751
This paper presents an effective robust predictive control scheme for the active power filter (APF) using a smith-predictor based current regulator, which show superior features when compared to proportional-integral (PI) controllers in terms of an enhanced closed-loop bandwidth and an improved current tracking accuracy. A moving average filter (MAF) is implemented using a field programmable gate array (FPGA) for signal pre-processing to eliminate the switching ripple contamination. An adaptive linear neural network (ADALINE) is used for individual harmonic estimation to achieve selective compensation purpose. The effectiveness and validity of the devised control algorithm are confirmed by extensive simulation and experimental results.
Application of HHT for Online Detection of Inter-Area Short Circuits of Rotor Windings of Turbo-Generators Based on the Thermodynamics Modeling Method
Wang, Liguo ; Wang, Yi ; Xu, Dianguo ; Fang, Bo ; Liu, Qinghe ; Zou, Jing ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 759~766
DOI : 10.6113/JPE.2011.11.5.759
This paper focuses on monitoring and predicting the short circuit faults of the rotor windings of large turbo-generator systems. For the purpose of increasing efficiency and decreasing maintenance cost, a method that combines the HHT (Hilbert Huang Transform) with a wavelet has been studied. This method is based on analyzing a classical Albright detecting coil. Due to the Empirical Mode Decomposition (EMD) and the Intrinsic Mode Functions (IMF) of the HHT the exact location of a short circuit of rotor windings may be given. However, a part of the useful information is eliminated by the unreasonable decomposing scale of the wavelet. Based on the thermodynamics modeling method, this study was illustrated with a 50MW turbo-generator system that is installed in Northern China. The analysis results, which have very good agreement with those of a previous study, show that the method of combining the HHT with a wavelet is an effective way to analyze and predict the short circuit faults of the rotor windings of large generators, such as supercritical turbo-generator systems and wind turbo-generator systems. This work can offer a useful reference for analyzing smart grids by improving the power quality of a distribution network that is supplied by a turbo-generator system.
Classification and Comparison of EMI Mitigation Techniques in Switching Power Converters - A Review
Yazdani, Mohammad Rouhollah ; Farzanehfard, Hosein ; Faiz, Jawad ;
Journal of Power Electronics, volume 11, issue 5, 2011, Pages 767~777
DOI : 10.6113/JPE.2011.11.5.767
Power electronic systems such as switching power supplies are accounted as noise sources for other sensitive circuits. EMI caused by power converters can disturb the normal operation of the converter and other adjacent systems. Major research is concentrated on EMI mitigation for power converters in which the main concern is compliance with EMC standards to ensure proper operation of converters and nearby systems. This paper reviews EMI reduction techniques related to switching power converters with emphasis on the conducted EMI. A comprehensive review of significant research works is performed and various methods are thoroughly discussed and compared. Also, a classification of methods is presented. Moreover, converter prototypes are realized which contain several EMI mitigation techniques and their effects are presented via experimental results.