Automatic Turn-off Angle Control for High Speed SRM Drives

Nashed Maged N.F.,Ohyama Kazuhiro,Aso Kenichi,Fujii Hiroaki,Uehara Hitoshi The Korean Institute of Power Electronics 2007 JOURNAL OF POWER ELECTRONICS Vol.7 No.1

This paper presents a new approach to the automatic control of the turn-off angle used to excite the Switched Reluctance Motor (SRM) employed in electric vehicles (EV). The controller selects the turn-off angle that supports and improves the performance of the motor drive system. This control scheme consisting of classical current control and speed control depends on a lookup table to take the best result of the motor. The turn-on angle of the main switches of the inverter is fixed at $0^{\circ}C$ and the turn-off angle is variable depending on the reference speed. The motor, inverter and control system are modeled in Simulink to demonstrate the operation of the system.

Design of a Digital PWM Controller for a Soft Switching SEPIC Converter

Nashed, Maged N.F. The Korean Institute of Power Electronics 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.3

This paper presents analysis, modeling, and design of a low-harmonic, isolated, active-clamped SEPIC for future avionics applications. Simpler converter dynamics, high switching frequency, zero voltage-Transition-PWM switching, and a single-layer transformer construction result. This paper describes complete design of a digital controller for a high-frequency switching power supply. Guidelines for the minimum required resolution of the analog-to-digital converter, the pulse-width modulator, and the fixed-point computational unit is derived. A design example based on a SEPIC converter operating at the high switching frequency is presented. The controller design is based on direct digital design approach and standard root-locus techniques.

Transient Performance of a Hybrid Electric Vehicle with Multiple Input DC-DC Converter

Nashed, Maged N.F. The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.4

Electric vehicles (EV) demands for greater acceleration, performance and vehicle range in pure electric vehicles plus mandated requirements to further reduce emissions in hybrid electric vehicles (HEV) increase the appeal for combined on-board energy storage systems and generators. And the power electronics plays an important role in providing an interface between fuel cells (FC) and loads. This paper deals with a multiple input DC-DC power converter devoted to combine the power flowing of multi-source on energy systems. The multi-source is composed of (i) FC system as a prime power demands, (ii) super capacitor banks as energy storage devices for high and intense power demands, (iii) superconducting magnetic energy storage system (SMES), (iv) multiple input DC-DC power converter and (v) a three phase inverter-fed permanent magnet synchronous motor as a drive. In this system, It is used super capacitor banks and superconducting magnetic energy replaces from the battery system. The modeling and transient performance simulation is effective for reducing transient influence caused by sudden charge of effective load. The main purpose of power electronic converters is to convert the DC power output from the fuel cell and other to a suitable AC voltage, which can be connected to electric loads directly (PMSM). The fuel cell and other output is connected to the DC-DC converter, which regulates the DC link voltage.

Robust Fuzzy Logic Current and Speed Controllers for Field-Oriented Induction Motor Drive

El-Sousy, Fayez F.M.,Nashed, Maged N.F. The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.2

This paper presents analysis, design and simulation for the indirect field orientation control (IFOC) of induction machine drive system. The dynamic performance of the IFOC under nominal and detuned parameters of the induction machine is established. A conventional proportional plus integral-derivative (PI-D) two-degree-of-freedom controller (2DOFC) is designed and analysed for an ideal IFOC induction machine drive at nominal parameters with the desired dynamic response. Varying the induction machine parameters causes a degredation in the dynamic response for disturbance rejection and tracking performance with PI-D 2DOF speed controller. Therefore, conventional controllers can nut meet a wide range of speed tracking performance under parameter variations. To achieve high- dynamic performance, a proposed robust fuzzy logic controllers (RFLC) for d-axis rotor flux, d-q axis stator currents and rotor speed have been designed and analysed. These controllers provide robust tracking and disturbance rejection performance when detuning occurres and improve the dynamic behavior. The proposed REL controllers provide a fast and accurate dynamic response in tracking and disturbance rejection characteristics under parameter variations. Computer simulation results demonstrate the effectiveness of the proposed REL controllers and a robust performance is obtained fur IFOC induction machine drive system.

Automatic Turn-off Angle Control for High Speed SRM Drives

Maged N. F. Nashed,Kazuhiro Ohyama,Kenichi Aso,Hiroaki Fujii,Hitoshi Uehara 전력전자학회 2007 JOURNAL OF POWER ELECTRONICS Vol.7 No.1

This paper presents a new approach to the automatic control of the turn-off angle used to excite the Switched Reluctance Motor (SRM) employed in electric vehicles (EV). The controller selects the turn-off angle that supports and improves the performance of the motor drive system. This control scheme consisting of classical current control and speed control depends on a lookup table to take the best result of the motor. The turn-on angle of the main switches of the inverter is fixed at 0° and the turn-off angle is variable depending on the reference speed. The motor, inverter and control system are modeled in Simulink to demonstrate the operation of the system.

Design of a Digital PWM Controller for a Soft Switching SEPIC Converter

Maged N.F.Nashed 전력전자학회 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.3

This paper presents analysis, modeling, and design of a low-harmonic, isolated, active-clamped SEPIC for future avionics applications. Simpler converter dynamics, high switching frequency, zero voltage- Transition-PWM switching, and a single-layer transformer construction result. This paper describes complete design of a digital controller for a high frequency switching power supply. Guidelines for the minimum required resolution of the analog-to-digital converter, the pulse-width modulator, and the fixed-point computational unit is derived. A design example based on a SEPIC converter operating at the high switching frequency is presented. The controller design is based on direct digital design approach and standard root-locus techniques.

Simulation and Experimentals of a Bi-Directional Converter with Input PFC on SRM System

Maged N. F. Nashed 전력전자학회 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.2

This paper presents the performance and efficiency of a drive system incorporating a switched-reluctance motor (SRM) with input power factor correction (PFC). The proposed system consists of a PFC, bi-directional converter, an inverter, and a SRM operating as based voltage source drives (VSD). First, theoretical analysis is made for each identified mode of operation in the drive system. This is followed by comparing the performance of the SRM drive system with and without a PFC circuit. The losses are also calculated for both systems and overall efficiency. Experimental results are presented to prove the theoretical analysis.

Transient Performance of a Hybrid Electric Vehicle with Multiple Input DC-DC Converter

Maged N.F. Nashed 전력전자학회 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.4

Electric vehicles (EV) demands for greater acceleration, performance and vehicle range in pure electric vehicles plus mandated requirements to fm1her reduce emissions in hybrid electric vehicles (HEV) increase the appeal for combined on-board energy storage systems and generators And the power electronics plays an important role in providing an interface between fuel cells (FC) and loads This paper deals with a multiple input DC-DC power converter devoted to combine the power flowing of multi-source on energy systems. The multi-source is composed of (Ⅰ) FC system as a prime power demands, (Ⅱ) super capacitor banks as energy storage devices for high and intense power demands, (Ⅲ) superconducting magnetic energy storage system (SMES), (IV) multiple input DC-DC power converter and (Ⅴ) a three phase inverter-fed permanent magnet synchronous motor as a drive In this system) It is used super capacitor banks and superconducting magnetic energy replaces from the battery system. The modeling and transient performance simulation is effective for reducing transient influence caused by sudden charge of effective load The main purpose of power electronic converters is to convert the DC power output from the fuel cell and other to a suitable AC voltage, which can be connected to electric loads directly (PMSM) The fuel cell and other output is connected to the DC-DC converter, which regulates the DC link voltage

Robust Fuzzy Logic Current and Speed Controllers for Field-Oriented Induction Motor Drive

Fayez F.M EI-Sousy,Maged N.F.Nashed 전력전자학회 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.2

This paper presents analysis, design and simulation for the indirect field orientation control (IFOC) of induction machine drive system. The dynamic performance of the IFOC under nominal and detuned parameters of the induction machine is established. A conventional proportional plus integral-derivative (PI-D) two-degree-of-freedom controller (2DOFC) is designed and analysed for an ideal IFOC induction machine drive at nominal parameters With the desired dynamic response Varying the induction machine parameters causes a degredation in the dynamic response for disturbance rejection and tracking performance with PI-D 2DOF speed controller. Therefore, conventional controllers can not meet a wide range of speed tracking performance under parameter variations. To achieve high - dynamic performance, a proposed robust fuzzy logic controllers (RFLC) for d-axis rotor flux, d-q axis stator currents and rotor speed have been designed and analysed These controllers provide robust tracking and disturbance rejection performance when detuning occures and improve the dynamic behavior. The proposed RFL controllers provide a fast and accurate dynamic response m tracking and disturbance rejection characteristics under parameter variations. Computer simulation results demonstrate the effectiveness of the proposed RFL controllers and a robust performance is obtained for IFOC induction machine drive system.