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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Power Electronics
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Journal DOI :
The Korean Institute of Power Electronics
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Volume & Issues
Volume 13, Issue 6 - Nov 2013
Volume 13, Issue 5 - Sep 2013
Volume 13, Issue 4 - Jul 2013
Volume 13, Issue 3 - May 2013
Volume 13, Issue 2 - Mar 2013
Volume 13, Issue 1 - Jan 2013
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Resonant CLL Non-Inverting Buck-Boost Converter
Jabbari, Masoud ; Sharifi, Saead ; Shahgholian, Ghazanfar ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 1~8
DOI : 10.6113/JPE.2013.13.1.1
This paper presents a resonant non-inverting buck-boost converter in which all switches operate under ZCS conditions. In a symmetric configuration, a CLL resonant tank along with an inverter arm and a rectifying diode are employed. The diode is turned off at ZCS and hence the problem of its reverse recovery is obviated also. As a result switching losses and EMI are reduced and switching frequency can be increased. The converter can work at DCM and CCM depend on the switching frequency and the load-current. Experimental results from a 200W/200KHz laboratory prototype verify operation of the proposed converter and the presented theoretical analysis.
Embedded Switched-Inductor Z-Source Inverters
Nguyen, Minh-Khai ; Lim, Young-Cheol ; Chang, Young-Hak ; Moon, Chae-Joo ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 9~19
DOI : 10.6113/JPE.2013.13.1.9
In this paper, a ripple input current embedded switched-inductor Z-source inverter (rESL-ZSI) and a continuous input current embedded switched-inductor Z-source inverter (cESL-ZSI) are proposed by inserting two dc sources into the switched-inductor cells. The proposed inverters provide a high boost voltage inversion ability, a lower voltage stress across the active switching devices, a continuous input current and a reduced voltage stress on the capacitors. In addition, they can suppress the startup inrush current, which otherwise might destroy the devices. This paper presents the operating principles, analysis, and simulation results, and compares them to the conventional switched-inductor Z-source inverter. In order to verify the performance of the proposed converters, a laboratory prototype was constructed with 60
input to test both configurations.
Analysis, Design and Implementation of a Soft Switching DC/DC Converter
Lin, Bor-Ren ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 20~30
DOI : 10.6113/JPE.2013.13.1.20
This paper presents a soft switching DC/DC converter for high voltage application. The interleaved pulse-width modulation (PWM) scheme is used to reduce the ripple current at the output capacitor and the size of output inductors. Two converter cells are connected in series at the high voltage side to reduce the voltage stresses of the active switches. Thus, the voltage stress of each switch is clamped at one half of the input voltage. On the other hand, the output sides of two converter cells are connected in parallel to achieve the load current sharing and reduce the current stress of output inductors. In each converter cell, a half-bridge converter with the asymmetrical PWM scheme is adopted to control power switches and to regulate the output voltage at a desired voltage level. Based on the resonant behavior by the output capacitance of power switches and the transformer leakage inductance, active switches can be turned on at zero voltage switching (ZVS) during the transition interval. Thus, the switching losses of power MOSFETs are reduced. The current doubler rectifier is used at the secondary side to partially cancel ripple current. Therefore, the root-mean-square (rms) current at output capacitor is reduced. The proposed converter can be applied for high input voltage applications such as a three-phase 380V utility system. Finally, experiments based on a laboratory prototype with 960W (24V/40A) rated power are provided to demonstrate the performance of proposed converter.
Non-isolated Boost Charger for the Li-Ion Batteries Suitable for Fuel Cell Powered Laptop Computers
Sang, Nguyen Van ; Choi, Woojin ; Kim, Dae-Wook ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 31~39
DOI : 10.6113/JPE.2013.13.1.31
The conventional non-isolated boost converter has some drawbacks such as poor dynamic performance and a discontinuous output current, which make it unsuitable for battery charging applications. In spite of its compactness and lightness, it is not preferred as a charger of portable electronic devices. In this paper, a non-isolated boost converter topology for Li-ion batteries suitable for fuel cell powered laptop computers is proposed and analyzed. The proposed converter has an additional inductor at the output to make a continuous output current. This feature makes it suitable for charger applications by eliminating the disadvantages of the conventional non-isolated boost converter mentioned above. A prototype of the proposed converter is built for the Li-ion battery charger of a laptop computer to prove the validity and advantages of the proposed topology.
Novel Zero-Voltage-Switching Bridgeless PFC Converter
Haghi, Rasool ; Zolghadri, Mohammad Reza ; Beiranvand, Reza ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 40~50
DOI : 10.6113/JPE.2013.13.1.40
In this paper, a new zero-voltage-switching, high power-factor, bridgeless rectifier is introduced. In this topology, an auxiliary circuit provides soft switching for all of the power semiconductor devices. Thus the switching losses are reduced and the highest efficiency can be achieved. The proposed converter has been analyzed and a design procedure has been introduced. The control circuit for the converter has also been developed. Based on the given approach, a 250 W, 400 Vdc prototype converters has been designed at 100 kHz for universal input voltage (90-264 Vrms) applications. A maximum efficiency of 94.6% and a power factor correction over 0.99 has been achieved. The simulation and experimental results confirm the design procedure and highlight the advantages of the proposed topology.
Analysis and Design of a New Topology of Soft-Switching Inverters
Chen, Rong ; Zhang, Jia-Sheng ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 51~58
DOI : 10.6113/JPE.2013.13.1.51
This paper proposes the power conversion mechanism of a bailer-charge-transfer zero-current-switching (CT-ZCS) circuit. The operation modes are analyzed and researched using state trajectory equations. The topology of CT-ZCS based on soft-switching inverters offers some merits such as: tracking the input reference signal dynamically, bearing load shock and short circuit, multiplying inverter N+1 redundancy parallel, coordinating power balance for easy control, and soft-switching commutation for high efficiency and large capacity. These advantages are distinctive from conventional inverter topologies and are especially demanded in AC drives: new energy generation and grid, distributed generation systems, switching power amplifier, active power filter, and reactive power compensation and so on. Prototype is manufactured and experiment results show the feasibility and dynamic voltage-tracking characteristics of the topology.
Multistage Inverters Control Using Surface Hysteresis Comparators
Menshawi, Menshawi K. ; Mekhilef, Saad ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 59~69
DOI : 10.6113/JPE.2013.13.1.59
An alternative technique to control multilevel inverters with vector approximations has been presented. The innovative control method utilizes specially designed two-dimensional hysteresis comparators to simplify the implementation and improve the resultant waveform. The multistage inverter designed with maximum number of levels is operated in such a way to approximate the reference voltage vector by exploiting the large number of multilevel inverter vectors. A three-stage inverter with the main high voltage stage made of three phase, six-switch and singly-fed inverter is considered for application to the proposed design. The proposed control concept is to maintain a higher voltage stage state as long as it can lead to a target vector. High and medium voltage stages controllers are based on surface hysteresis comparators to hold the switching state or to perform the necessary change to achieve its reference voltage with minimal switching losses. The low voltage stage controller is designed to approximate the target reference voltage to the nearest inverter vector using the nearest integer rounding and adjustment comparators. Model simulation and prototype test results show that the proposed control technique clearly outperforms the previous control methods.
Transformerless Three-Level DC-DC Buck Converter with a High Step-Down Conversion Ratio
Zhang, Yun ; Sun, Xing-Tao ; Wang, Yi-Feng ; Shao, Hong-Jun ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 70~76
DOI : 10.6113/JPE.2013.13.1.70
For high power high step-down dc-dc conversion applications, conventional three-level dc-dc converters are subject to extreme duty cycles or increased volume and cost due to the use of transformers. In this paper, a transformerless three-level dc-dc buck converter with a high step-down conversion ratio is proposed. The converter comprises two asymmetrical half bridges, which are of the neutral point clamped structures. Therefore, the output pulse voltage of the converter can be obtained in terms of the voltage difference between the two half bridges. In order to realize harmonious switching of the converter, a modulation strategy with capacitor voltages self balance is presented. According to the deduced output dc voltage function, transformerless operation without extreme duty cycles can be implemented. Experimental results from a 1kW prototype verify the validity of the proposed converter. It is suitable for ship electric power distribution systems.
A Dead Time Compensation Algorithm of Independent Multi-Phase PMSM with Three-Dimensional Space Vector Control
Park, Ouk-Sang ; Park, Je-Wook ; Bae, Chae-Bong ; Kim, Jang-Mok ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 77~85
DOI : 10.6113/JPE.2013.13.1.77
This paper proposes a new dead time compensation method of independent six-phase permanent magnet synchronous motors (IS-PMSM). The current of the independent phase machines contains odd-numbered harmonics because of the dead time and the nonlinear characteristics of the switching devices. By using the d-q-n three-dimensional vector analysis, these harmonics can be extracted at the n-axis current. Thus, the current distortion can be compensated by controlling the n-axis current of the IS-PMSM to zero. The proposed method is simple and can be easily implemented without additional hardware setup. The validity of the proposed compensation method is verified with simulations and several experiments.
Half-Cycle-Waveform-Inversed Single-Carrier Seven-level Sinusoidal Modulation
Wu, Fengjiang ; Sun, Bo ; Zhang, Lujie ; Sun, Li ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 86~93
DOI : 10.6113/JPE.2013.13.1.86
A half-cycle-waveform inversion based three reference modulations seven-level SPWM (TRM-SPWM) scheme with one carrier is proposed in this paper. To keep the same comparison logics for the modulations and carrier during the negative half cycle and the positive one for the modulations, in the negative half cycle of the modulations, the DC offsets related to the amplitude of the carrier are set on the three modulations, respectively. The seven-level SPWM waveform with dead time thereby is implemented with only one Digital Signal Processor (DSP) without any other attached logic circuit. The basis principle of the proposed TRM-SPWM is analyzed in detail, and the frequency spectrums of the conventional and the proposed schemes are derived and compared with each other through simulation. The DSP based implementation is presented and detailed experimental waveforms verify the accuracy and feasibility of the proposed TRM-SPWM scheme.
A Capacitance Estimation of Film Capacitors in an LCL-Filter of Grid-Connected PWM Converters
Heo, Hong-Jun ; Im, Won-Sang ; Kim, Jang-Sik ; Kim, Jang-Mok ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 94~103
DOI : 10.6113/JPE.2013.13.1.94
A capacitor deterioration of LCL-filter grid-connected PWM converters is progressed by the self-healing mechanism. It leads to the degradation of the filter performance and drop of power factor. Thus, it is required to diagnose fault-point of capacitors and determine the replacement time. Typically, the fault of capacitors is determined when the capacitance is reduced up to 80% from initial value. This paper proposes algorithm to the determine capacitor replacement time of an LCL filter. The algorithm takes the advantage of change of the response on the injected resonant frequency corresponding to 80% value from the initial capacitance. The results of the algorithm are demonstrated through simulations and experiments.
Comparative Analysis of Three-Phase AC-DC Converters Using HIL-Simulation
Raihan, Siti Rohani Sheikh ; Rahim, Nasrudin Abd. ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 104~112
DOI : 10.6113/JPE.2013.13.1.104
This paper presents a comparative evaluation of various topologies for three-phase power converters using the hardware-in-the-loop (HIL) simulation technique. Various switch-mode AC-DC power converters are studied, and their performance with respect to total harmonic distortion (THD), efficiency, power factor and losses are analyzed. The HIL-simulation is implemented in an Altera Cyclone II DE2 Field Programmable Gate Array (FPGA) Board and in the Matlab/Simulink environment. A comparison of the simulation and HIL-simulation results is also provided.
Experimental and Numerical Analysis of a Simple Core Loss Calculation for AC Filter Inductor in PWM DC-AC Inverters
Lee, Kyoung-Jun ; Cha, Honnyong ; Lee, Jong-Pil ; Yoo, Dong-Wook ; Kim, Hee-Je ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 113~121
DOI : 10.6113/JPE.2013.13.1.113
This paper introduces a simple core loss calculation method for output filter inductor in pulse width modulation (PWM) DC-AC inverter. Amorphous C-core (AMCC-320) is used to analyze the core loss. In order to measure core loss of the output filter inductor and validate the proposed method, a single-phase half-bridge inverter and a calorimeter are used. By changing switching frequency and modulation index (MI) of the inverter, core loss of the AMCC-320 is measured with the lab-made calorimeter and the results are compared with calculated core loss. The proposed method can be easily extended to other core loss calculation of various converters.
Adaptive Control of Peak Current Mode Controlled Boost Converter Supplied by Fuel Cell
Bjazic, Toni ; Ban, Zeljko ; Peric, Nedjeljko ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 122~138
DOI : 10.6113/JPE.2013.13.1.122
Adaptive control of a peak current mode controlled (PCM) boost converter supplied by a PEM fuel cell is described in this paper. The adaptive controller with reference model and signal adaptation is developed in order to compensate the deviation of the response during the change of the operating point. The procedure for determining the adaptive algorithm's weighting coefficients, based on a combination of the pole-zero placement method and an optimization method is proposed. After applying the proposed procedure, the optimal adaptive algorithm's weighting coefficients can be determined in just a few iterations, without the use of a computer, thus greatly facilitating the application of the algorithm in real systems. Simulation and experimental results show that the dynamic behavior of a highly nonlinear control system with a fuel cell and a PCM boost converter, can fairly accurately be described by the dynamic behavior of the reference model, i.e., a linear system with constant parameters.
Robust Recurrent Wavelet Interval Type-2 Fuzzy-Neural-Network Control for DSP-Based PMSM Servo Drive Systems
El-Sousy, Fayez F.M. ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 139~160
DOI : 10.6113/JPE.2013.13.1.139
In this paper, an intelligent robust control system (IRCS) for precision tracking control of permanent-magnet synchronous motor (PMSM) servo drives is proposed. The IRCS comprises a recurrent wavelet-based interval type-2 fuzzy-neural-network controller (RWIT2FNNC), an RWIT2FNN estimator (RWIT2FNNE) and a compensated controller. The RWIT2FNNC combines the merits of a self-constructing interval type-2 fuzzy logic system, a recurrent neural network and a wavelet neural network. Moreover, it performs the structure and parameter-learning concurrently. The RWIT2FNNC is used as the main tracking controller to mimic the ideal control law (ICL) while the RWIT2FNNE is developed to approximate an unknown dynamic function including the lumped parameter uncertainty. Furthermore, the compensated controller is designed to achieve
tracking performance with a desired attenuation level and to deal with uncertainties including approximation errors, optimal parameter vectors and higher order terms in the Taylor series. Moreover, the adaptive learning algorithms for the compensated controller and the RWIT2FNNE are derived by using the Lyapunov stability theorem to train the parameters of the RWIT2FNNE online. A computer simulation and an experimental system are developed to validate the effectiveness of the proposed IRCS. All of the control algorithms are implemented on a TMS320C31 DSP-based control computer. The simulation and experimental results confirm that the IRCS grants robust performance and precise response regardless of load disturbances and PMSM parameters uncertainties.
Novel Control Strategy for a UPQC under Distorted Source and Nonlinear Load Conditions
Trinh, Quoc-Nam ; Lee, Hong-Hee ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 161~169
DOI : 10.6113/JPE.2013.13.1.161
This paper proposes a novel control strategy for a unified power quality conditioner (UPQC) including a series and a shunt active power filter (APF) to compensate the harmonics in both the distorted supply voltage and the nonlinear load current. In the series APF control scheme, a proportional-integral (PI) controller and a resonant controller tuned at six multiples of the fundamental frequency of the network (
) are performed to compensate the harmonics in the distorted source. Meanwhile, a PI controller and three resonant controllers tuned at
(n=1, 2, 3) are designed in the shunt APF control scheme to mitigate the harmonic currents produced by nonlinear loads. The performance of the proposed UPQC is significantly improved when compared to that of the conventional control strategy thanks to the effective design of the resonant controllers. The feasibility of the proposed UPQC control scheme is validated through simulation and experimental results.
Weighting Method to Identify Interharmonics based on Calculating the Bandwidth in Group-Harmonics
Vahedi, Hani ; Kiapi, Alireza Alizadeh ; Bina, Mohammad Tavakoli ; Al-Haddad, Kamal ;
Journal of Power Electronics, volume 13, issue 1, 2013, Pages 170~176
DOI : 10.6113/JPE.2013.13.1.170
Power converters produce a vast range of harmonics, subharmonics and interharmonics. Harmonics analyzing tools based on the Fast Fourier Transform (FFT) assume that only harmonics are present and the periodicity intervals are fixed, while these periodicity intervals are variable and long in the presence of interharmonics. Using FFT may lead to invalid and undesired results due to the above mentioned issues. They can also lead to problems such as frequency blending, spectral leakage and the picket-fence effect. In this paper, the group-harmonic weighting (GHW) approach has been presented to identify the interharmonics in a power system. Afterwards, a modified GHW has been introduced to calculate the proper bandwidth for analyzing the various values of interharmonics. Modifying this method leads to more precise results in the FFT of a waveform containing inter harmonics especially in power systems with a fundamental frequency drift or frequency interference. Numerical simulations have been performed to prove the efficiency of the presented algorithm in interharmonics detection and to increase the accuracy of the FFT and the GWH methods.