International Journal of Power Electronics http://www.inderscience.com/browse/index.php?journalID=302&year=2012&vol=4&issue=1 Inderscience Publishers Ltd en-uk International Journal of Power Electronics 1756-638X 1756-6398 © 2012 Inderscience Publishers Ltd editor@inderscience.com https://www.inderscience.com/images/files/coverImgs/ijpelec_scoverijpelec.jpg http://www.inderscience.com/browse/index.php?journalID=302&year=2012&vol=4&issue=1 http://www.inderscience.com/link.php?id=44145 The hybrid active front-end converter, which is composed of a capacitor and a voltage source converter in series connection, has been presented recently. Compared with grid-connected converter, the hybrid converter could be operated with reduced dc voltage as well as small-sized passive filters due to series-connected capacitor. This paper presents a power flow control method for a hybrid active front-end converter. Real power of the converter is controlled by the output voltage vector perpendicular to the grid voltage, whereas reactive power of the converter is determined by the output voltage vector parallel to the grid voltage. By dynamically adjusting voltage vector, power conversion between low-voltage dc side, such as PVs or batteries, and high-voltage grid side could be accomplished with no low-frequency transformer required. In addition, a harmonic resistance is emulated in the proposed method to avoid inrush current flowing into the converter due to unintentional voltage spike coming from the power system. Operation principles are explained in detail, followed by both computer simulations and experimental results validating effectiveness. A power-flow control method for hybrid active front-end converters
Yen-Ching Wang; Zong-Jie Chen; Shang-Hung Hu; Tzung-Lin Lee
International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 1 - 16
The hybrid active front-end converter, which is composed of a capacitor and a voltage source converter in series connection, has been presented recently. Compared with grid-connected converter, the hybrid converter could be operated with reduced dc voltage as well as small-sized passive filters due to series-connected capacitor. This paper presents a power flow control method for a hybrid active front-end converter. Real power of the converter is controlled by the output voltage vector perpendicular to the grid voltage, whereas reactive power of the converter is determined by the output voltage vector parallel to the grid voltage. By dynamically adjusting voltage vector, power conversion between low-voltage dc side, such as PVs or batteries, and high-voltage grid side could be accomplished with no low-frequency transformer required. In addition, a harmonic resistance is emulated in the proposed method to avoid inrush current flowing into the converter due to unintentional voltage spike coming from the power system. Operation principles are explained in detail, followed by both computer simulations and experimental results validating effectiveness.

]]> 10.1504/IJPELEC.2012.044145 International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 1 - 16 Yen-Ching Wang; Zong-Jie Chen; Shang-Hung Hu; Tzung-Lin Lee Department of Electrical Engineering, National Sun Yat-sen University, No. 70, Lienhai Rd., Kaohsiung 80424, Taiwan. ' Getac Technology Corp., 5F Building A, No. 209, Sec. 1, Nangang Rd., Nangang Dist., Taipei City 11568, Taiwan. ' Department of Electrical Engineering, National Sun Yat-sen University, No. 70, Lienhai Rd., Kaohsiung 80424, Taiwan. ' Department of Electrical Engineering, National Sun Yat-sen University, No. 70, Lienhai Rd., Kaohsiung 80424, Taiwan hybrid front-end converters active front-end converters power flow control capacitors voltage source converters harmonic resistance. 2011-12-10T23:20:50-05:00 4 1 1 16 2011-12-10T23:20:50-05:00 http://www.inderscience.com/link.php?id=44146 This paper illustrates the control of chaotic behaviour in positive output Luo converter by slope compensation method. Bifurcation analysis is carried out in the discrete domain for a current controlled Luo converter operating in the continuous conduction mode. As the reference current is varied, periodic 1 orbit undergoes a flip bifurcation, periodic doubling and finally enters into chaotic regime. Variable ramp compensation technique is proposed to dynamically adjust the slope of the inductor current such that the upper bound of I<SUB align=“right”>ref is increased thereby widening the operating range. An iterative function that describes the dynamics of the inductor current with and without variable ramp compensation and the equivalent criteria for bifurcation-free operation is derived. A computer simulation using MATLAB/Simulink confirms the predicted bifurcations. The simulated results are validated through hardware implementation. Control of chaos in positive output Luo converter using slope compensation method
Anbukumar Kavitha; Govindarajan Uma
International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 17 - 32
This paper illustrates the control of chaotic behaviour in positive output Luo converter by slope compensation method. Bifurcation analysis is carried out in the discrete domain for a current controlled Luo converter operating in the continuous conduction mode. As the reference current is varied, periodic 1 orbit undergoes a flip bifurcation, periodic doubling and finally enters into chaotic regime. Variable ramp compensation technique is proposed to dynamically adjust the slope of the inductor current such that the upper bound of I<SUB align=“right”>ref is increased thereby widening the operating range. An iterative function that describes the dynamics of the inductor current with and without variable ramp compensation and the equivalent criteria for bifurcation-free operation is derived. A computer simulation using MATLAB/Simulink confirms the predicted bifurcations. The simulated results are validated through hardware implementation.

]]> 10.1504/IJPELEC.2012.044146 International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 17 - 32 Anbukumar Kavitha; Govindarajan Uma Electrical and Electronics Department, College of Engineering, Guindy, Anna University, Chennai-600 025, India. ' Electrical and Electronics Department, College of Engineering, Guindy, Anna University, Chennai-600 025, India positive output DC-DC Luo converter current mode control variable ramp compensation VRC chaos control slope compensation chaotic behaviour bifurcation analysis simulation. 2011-12-10T23:20:50-05:00 4 1 17 32 2011-12-10T23:20:50-05:00 http://www.inderscience.com/link.php?id=44150 The hybrid recurrent fuzzy neural network (HRFNN) control permanent magnet synchronous motor (PMSM) drive system using rotor flux estimator is developed to control electric motorcycle in this paper. First, the dynamic models of a PMSM drive system and electric motorcycle are built through experimental tests and parameter measurements. Then, a HRFNN control system using rotor flux estimator is developed to control PMSM drive system in order to drive electric motorcycle. The rotor flux estimator consists of the estimation algorithm of rotor flux position and speed based on the back electromagnetic force (EMF). Moreover, the HRFNN controller consists of the supervisor control, RFNN and variable structure control (VSC) is applied to PMSM drive system using rotor flux estimator. The parameters of RFNN are trained to control command current in order to achieve different output torque of various speeds. The electric motorcycle is operated to provide constant disturbance torque. Finally, the effectiveness of the proposed control schemes is demonstrated by experimental results. The hybrid RFNN control for a PMSM drive system using rotor flux estimator
Chih-Peng Lin; Chih-Hong Lin
International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 33 - 48
The hybrid recurrent fuzzy neural network (HRFNN) control permanent magnet synchronous motor (PMSM) drive system using rotor flux estimator is developed to control electric motorcycle in this paper. First, the dynamic models of a PMSM drive system and electric motorcycle are built through experimental tests and parameter measurements. Then, a HRFNN control system using rotor flux estimator is developed to control PMSM drive system in order to drive electric motorcycle. The rotor flux estimator consists of the estimation algorithm of rotor flux position and speed based on the back electromagnetic force (EMF). Moreover, the HRFNN controller consists of the supervisor control, RFNN and variable structure control (VSC) is applied to PMSM drive system using rotor flux estimator. The parameters of RFNN are trained to control command current in order to achieve different output torque of various speeds. The electric motorcycle is operated to provide constant disturbance torque. Finally, the effectiveness of the proposed control schemes is demonstrated by experimental results.

]]> 10.1504/IJPELEC.2012.044150 International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 33 - 48 Chih-Peng Lin; Chih-Hong Lin Department of Engineering, Su-Mo Enterprise Co. Ltd, Taichung 430, Taiwan ' Department of Electrical Engineering, National United University, Miao Li 360, Taiwan. permanent magnet synchronous motors PMSM recurrent fuzzy neural networks RFNN variable structure control VSC rotor flux estimators electric motorcycles dynamic modelling. 2011-12-10T23:20:50-05:00 4 1 33 48 2011-12-10T23:20:50-05:00 http://www.inderscience.com/link.php?id=44147 This paper is devoted to control strategies for an active battery and supercapacitor hybrid energy storage system using the master-slave control scheme, where the charging and discharging currents of the supercapacitor are dependent on that of battery and the current sharing ratio depends upon the load conditions. A small-signal model is proposed, which considers the variations in the currents of individual energy storage devices and the DC bus voltage as state variables, the variations in the power converter duty cycles as control variables, the variations in the voltages of battery and supercapacitor and the load current as external disturbances. This paper also studies the effects of the variations in the controller and filter parameters on system performance using frequency-domain analysis. Simulation results verify the proposed control strategies and the effects on the final states of the energy storage devices and also validate frequency-domain analysis. Control and small-signal analysis of battery and supercapacitor hybrid energy storage systems
Yu Zhang; Zhenhua Jiang
International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 49 - 70
This paper is devoted to control strategies for an active battery and supercapacitor hybrid energy storage system using the master-slave control scheme, where the charging and discharging currents of the supercapacitor are dependent on that of battery and the current sharing ratio depends upon the load conditions. A small-signal model is proposed, which considers the variations in the currents of individual energy storage devices and the DC bus voltage as state variables, the variations in the power converter duty cycles as control variables, the variations in the voltages of battery and supercapacitor and the load current as external disturbances. This paper also studies the effects of the variations in the controller and filter parameters on system performance using frequency-domain analysis. Simulation results verify the proposed control strategies and the effects on the final states of the energy storage devices and also validate frequency-domain analysis.

]]> 10.1504/IJPELEC.2012.044147 International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 49 - 70 Yu Zhang; Zhenhua Jiang Department of Electrical and Computer Engineering, University of Miami, Coral Gables, FL 33146, USA. ' Department of Electrical and Computer Engineering, University of Miami, Coral Gables, FL 33146, USA batteries supercapacitors hybrid energy storage power sharing control strategy small-signal modelling power management power electronics simulation. 2011-12-10T23:20:50-05:00 4 1 49 70 2011-12-10T23:20:50-05:00 http://www.inderscience.com/link.php?id=44148 Current mode control (CMC) though offers improved line regulation, phase margin and high bandwidth suffers from high output impedance. Although load regulation can be improved by incorporating an integral gain, it reduces the phase margin and increases the overshoot. The objective of this paper is to achieve improved output impedance without using an integral controller. Incorporating a high pass filter in series with the current sensor in CMC, the closed loop DC gain of a CCM buck converter is shown to be almost independent of the load resistance, thus improving load regulation using a proportional controller only. Improved features of CMC are also retained. Following VMC modeling approach, we develop a method to obtain the small signal model of the proposed scheme, and extended to CMC with an accurate low frequency characterisation. The proposed scheme is implemented on a buck converter, and the theoretical results are validated by experiments. Improving load regulation in current mode control through inductor current filtering
Santanu Kapat; Amit Patra; Soumitro Banerjee
International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 71 - 93
Current mode control (CMC) though offers improved line regulation, phase margin and high bandwidth suffers from high output impedance. Although load regulation can be improved by incorporating an integral gain, it reduces the phase margin and increases the overshoot. The objective of this paper is to achieve improved output impedance without using an integral controller. Incorporating a high pass filter in series with the current sensor in CMC, the closed loop DC gain of a CCM buck converter is shown to be almost independent of the load resistance, thus improving load regulation using a proportional controller only. Improved features of CMC are also retained. Following VMC modeling approach, we develop a method to obtain the small signal model of the proposed scheme, and extended to CMC with an accurate low frequency characterisation. The proposed scheme is implemented on a buck converter, and the theoretical results are validated by experiments.

]]> 10.1504/IJPELEC.2012.044148 International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 71 - 93 Santanu Kapat; Amit Patra; Soumitro Banerjee GE Global Research Bangalore, Karnataka-560066, India. ' Indian Institute of Technology Kharagpur, West Bengal-721302, India. ' Indian Institute of Science Education and Research Kolkata, West Bengal-741252, India current mode control CMC high pass filters HPF small-signal modelling load regulation inductor current filtering. 2011-12-10T23:20:50-05:00 4 1 71 93 2011-12-10T23:20:50-05:00 http://www.inderscience.com/link.php?id=44149 This paper presents an innovative implementation of the recursive Gauss-Newton (GN) algorithm for extraction of the common current quality problems such as the current harmonics and current fluctuation. This paper introduces also the utilisation of the adaptive notch filters to efficiently track the unknown frequencies of the current disturbances. The paper exhibits the mitigation results for these current disturbances using a shunt power conditioner. Furthermore, the adopted shunt power conditioner is operated by the ramp-comparison current regulator. Also, the paper proves that the utilisation of the ramp-comparison current controller, (the linear current controller), is more meritorious than the commonly used current controller, which is the hysteresis current controller, (HCC). The effectiveness of the developed extraction technique with the employed current controller is verified by the simulation and experimental results. An efficient current regulator for a power conditioner operated by an innovative strategy
A. Elnady; Yanfei Liu
International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 94 - 117
This paper presents an innovative implementation of the recursive Gauss-Newton (GN) algorithm for extraction of the common current quality problems such as the current harmonics and current fluctuation. This paper introduces also the utilisation of the adaptive notch filters to efficiently track the unknown frequencies of the current disturbances. The paper exhibits the mitigation results for these current disturbances using a shunt power conditioner. Furthermore, the adopted shunt power conditioner is operated by the ramp-comparison current regulator. Also, the paper proves that the utilisation of the ramp-comparison current controller, (the linear current controller), is more meritorious than the commonly used current controller, which is the hysteresis current controller, (HCC). The effectiveness of the developed extraction technique with the employed current controller is verified by the simulation and experimental results.

]]> 10.1504/IJPELEC.2012.044149 International Journal of Power Electronics, Vol. 4, No. 1 (2012) pp. 94 - 117 A. Elnady; Yanfei Liu University of Sharjah, P.O. Box 27272, Sharjah, UAE; RMC-Canada, P.O. Box 17000, Station Forces, Kingston, ON, K7K 7B4, Canada. ' Queen's University, 19 Union Street, Walter Light Hall, Kingston, Ontario K7L 3N6, Canada ramp-comparison current regulators recursive Gauss-Newton current quality disturbances shunt power conditioners current harmonics current fluctuation adaptive notch filters simulation. 2011-12-10T23:20:50-05:00 4 1 94 117 2011-12-10T23:20:50-05:00