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In this paper, implementation of a virtual resistance controller for DC-DC boost converter Dahono 1 to improve the damping during transient response is proposed. The virtual resistance is developed by using pole placement and root locus techniques to obtain the desired transient response for the converter. The model that considering component non-idealities then established. In order to verify the...
This paper investigates the optimum phase number for multiphase PWM inverters. The input current ripple is used as a performance indicator. Analysis results show that phase number more than nine cannot provide significant input current ripple reduction. Experimental results are included in this paper to show the validity of the proposed analysis method.
This paper proposes new step-up DC-DC converters with high ratio capability. The proposed DC-DC converters are derived using combination of boost converters and buck-boost converters. A high ratio capability is achieved by parallel input and series output combination so that the efficiency is better than the one that is achieved by using a conventional boost converter. A method to reduce the input...
This paper presents a new approach to reduce current ripple of PWM inverters by Variable Switching Period (VSP). The analytical expressions for output current ripple of the inverter as a function of the PWM reference signal are derived. The current ripples of the proposed method are then compared to the one using constant switching period. This method provides general expressions to control the current...
A multiple three-phase machine can be symmetrical or asymmetrical, depending on the phase displacement between the three-phase stator winding sets. This paper investigates the optimal phase displacement to minimize the output current ripple of nine-phase PWM inverters. The output current can be separated into current components that produce air gap flux and current components that produce copper losses...
A new method to achieve minimum output current ripple of discontinuous PWM three-phase voltage source inverters is presented in this paper. The proposed method is realized by varying the switching period based on the total current ripple pattern. To show the general applicability of the proposed method, analytical expressions for output current ripple of the inverter as a function of the discontinuous...
A multiple three-phase machine is a machine with multiple three-phase stator winding groups. These three-phase groups can be conFig.d symmetrically or asymmetrically. This work investigates the optimal displacement for nine-phase (3×3) machine to minimize the input current ripple. From the analytical result, it can be concluded that the symmetrical configuration provides minimum input current ripple...
This paper presents a new control strategy for single-phase bidirectional converters. The converter can be operated as a rectifier, an inverter, and as a static VAR compensator, i.e. four-quadrant of operation. The key of this capability is the current controller of the converter. A new hysteresis current controller is proposed in this paper. The proposed hysteresis current controller can distribute...
An analysis and design of variable double-band hysteresis current controller for single-phase full-bridge bidirectional converters are presented in this paper. A variable double-band hysteresis is applied into bidirectional converter current controllers in order to improve dynamic response and reduce switching losses by increasing the switching frequency when inverter output current is relatively...
This paper presents an input current ripple analysis of inverter fed dual three-phase induction motors. Four types of modulation strategies are compared. The first is single-carrier with zero phase displaced modulation signals, second is single carrier with 30° phase displaced modulation signals, third is double carrier with zero phase displaced modulation signals, and fourth is double carrier with...
An input current ripple analysis of PWM inverter fed double-stator AC drive system is proposed in this paper. The expression of rms input current ripple of PWM inverter as a function of phase difference between stator windings is derived. It is found that the optimum phase difference that results in minimum input current ripple is 60o. Several experimental results are included to show the validity...
A new approach to analysis and minimization of neutral current of three-level PWM inverter is proposed in this paper. At first, expression for inverter neutral current as a function of PWM reference signal is derived. Based on the derived expression, the PWM reference signal that results in minimum neutral current is determined. For unity power-factor operation, it is found that the optimum reference...
Analysis method for input current ripple in several configuration of six-legs twelve-devices inverters is proposed in this research. It begins with deriving the expression for the rms value of six-phase PWM inverters as a function of reference signal. Based on its load, there are two kinds of inverters that is used in this research, which are double winding (dual stator) and dual fed. Double winding...
An input current-ripple analysis of nine-phase pulse width modulated (PWM) inverter is presented in this paper. The current-ripple is analyzed using a frequency domain approach. Two configurations of nine-phase inverter (symmetrical and asymmetrical) are analyzed. Analysis results show that symmetrical configuration has lower input current-ripple compared to asymmetrical configuration. Several experimental...
Multilevel inverter has emerged as a new solution of power converter for high power applications. Many efforts have been done to obtain the best performance of multilevel inverter to provide the need of power converter for high-power medium-voltage applications. Multilevel inverter using modular-cascaded topology with single dc voltage source is presented in this manuscript. Inverter topology, features...
An input current-ripple analysis of nine-phase pulsewidth-modulated (PWM) Inverter is presented in this paper. The current-ripple is analyzed using frequency domain approach. Two configuration of nine-phase inverter (nine-phase split 20° and split 40) are analyzed. From the results, it is shown that split 20° configuration has lower input current-ripple compared to split 40° configuration. Simulation...
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