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The design of the voltage loop and current loop of three-phase high power factor PWM rectifier was introduced, the strategy of dual-mode control that combine fuzzy control to PI regulator is proposed, which use fuzzy controller to obtain quick dynamic response when deviation is in small range and adopt PI regulator to realize no static error when deviation is in long range, improving the control accuracy...
Abstract-Due to nonlinear electromagnetic characteristics of Switched Reluctance Motor (SRM), as well as complexity of voltage and current waveforms, it is of great difficulty to control SRM optimally and compute power losses. A novel optimal control strategy of Non-Energy Returnable Current Chop (NERCC) was proposed, which is suitable for high power SRM drive. This method can obtain current waveform...
Lightweight power supply systems using soft-switched high frequency dc-dc converter for rolling stock is proposed in this paper. The system consists of hard switched boost chopper, soft switched high frequency inverter, high frequency transformer and rectifier. This system features a boost chopper to control the input current and to set up a controlled DC link. And A soft switched full bridge inverter...
This paper presents and compares the performance of two controllers namely Fuzzy Logic and Proportional Integral applied to a voltage source inverter/converter operating as an active power filter. The active power filter is operated to compensate harmonics and reactive power generated by the non-linear load and power factor correction simultaneously. This work is performed in order to make an accurate...
This paper presents a novel model for average current control that can be applied to the buck-cascaded buck-boost converter (BuCBB) with two independently controlled switches in universal input power factor correction (PFC) circuits. The proposed BuCBB PFC model consists an averaged BuCBB topology with all the switching elements replaced by dependent sources and an average current control scheme with...
SRM is suitable to be used as drivers of electric bicycle (E-bike). A nonlinear dynamics model based on Matlab/Simulink of E-bike and four regenerative braking strategies of SRM are presented in this paper, such as most feedback power control strategy, most feedback efficiency control, fixed torque control, fixed feedback current control. A hybrid control strategy of PWM mode and current chopping...
The magnetic circuit of switched reluctance motor (SRM) is seriously nonlinear because certain parts of the stator and rotor may go into magnetic saturation and the mutual inductance will be large when the motor works at two-phase excitation. These factors make the control of winds current very difficult. This paper analyzed the inductance of 8/6 SRMs including mutual inductance. Then a novel current...
This paper proposes the predictive delta-modulation current regulator (PDCR) algorithm for use with the switched reluctance motor. The proposed PDCR combines features of the convention delta-modulation current regulator, which has simple structure and does not require any motor parameters, and the predictive current control, which estimates the current error signal of the next sampling period using...
This paper presents a digital implementation of two-axis position control of microstepping bipolar drive with the controlled current, depending on the load torque applied. The topology of power converter for each motor is the conventional three-phase inverter, using space-vector pulse-width-modulation (PWM) technique. It is well known that the microstepping technique allows the stepping motor rotating...
A design of two-phase hybrid stepping motor driver with current closed-loop control based on the PIC mcu has been presented. A microstepping technique has been implemented in order to meet the requirement of constant torque and smooth movement, which adjusts the current in each winding in sinusoidal fashion. Binary and decimal subdivision are achieved by software programming in the PIC microcontroller...
A current-control mode three-level pulse width modulation (PWM) switching power amplifier for active magnetic bearings was proposed in this paper. The basic structure of this power amplifier is introduced. The basic characteristics of this power amplifier are simulated in PSPICE, measured and compared with that of a standard two-level PWM switching power amplifier. It is shown that the current ripple...
This paper proposes an input-paralleled output-paralleled half-bridge converter based on single half-bridge converter, which is very suitable for the low output voltage and large output current application. All modules share a common capacitor-leg, that can reduce the number of main circuitpsilas capacitors and make topology simple. The traits and rules of combination converter are introduced and...
To draw a sinusoidal line current and to achieve high power factor and low voltage stress of power switches, Some single-phase three-level switching mode unidirectional rectifiers with power diodes have been presented. But there is an inherited disadvantage of imbalance of the DC-link voltage, which is difficult to be solved only by control method. A novel three-level rectifier with asymmetrical legs...
Previous publications revealed that system stability was degraded due to the delay of computational time and the conversion time of A/D converter. It could induce system oscillation and even system stability could be destroyed. Predictive results of conventional current state observer were not ideal because that it was open loop in essence. To alleviate this problem, a method based on new state observer...
This paper proposes the digital charge control method to boost converter operating with a type of nonlinear load, the constant power load. The constant power load is modeled theoretically, and model parameters are given in detail. Transfer functions of the boost converter with constant power load are deduced, and a small-signal model of the charge controlled current inner loop is presented. The digital...
Multicell converters are one of the alternative topologies for medium voltage industrial drives. For application requiring regenerative capability each power cell must be constructed with a three- or single-phase PWM rectifier as a front end. The choice of single-phase PWM rectifiers for the input of the cells results in a reduced number of power switches and a simpler input transformer than the three-phase...
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