Improved Performance of Three Phase Motor with High Power Quality Based on Dual Boost Converter

Abstract

With rapid advancement in power semiconductor device, make it possible many to develop many applications in industrial and daily life. One of the most interested application in a broad area is the induction motor control. The aim of this paper is to implement a new control system for driving three-phase induction motor .this control system aim to enhance the performance of induction motor as well as improving the power factor at both input sides and output sides with remarkable reduction in total harmonics distortion of the supply current .the system consists of dual boost converter connected in parallel with uncontrolled rectifier for producing a dc voltage .this approach depends on the power-sharing optimization strategy to enhance the current quality, which leads to keeping power factor at the input side near unity with minimization of the total harmonics distortion (THD) of supply current . The dc voltage produced from this structure is delivered to a three-phase inverter which is controlled by space vector pulse width modulation (SVPWM) for driving three phase induction motor. The proposed system has been implemented using MATLAB/Simulink software package. The simulation results show promising improvement of the induction motor performance.

Modern Hybrid Excited Electric Machines

“…They show that the induced voltage and magnetic flux related to the machine axes d and q -and, consequently, to the electromagnetic torque depend on the flux from permanent magnets and the current in the excitation coil [18,19]. Information about transformation from threephase (L1 -L2 -L3) system to two phase (α-β) system, and then to d-q axis, are described in details e.g., in [20], Controlled magnets are the basic executive part of all magnetic bearings [16,17]. Figure 2 shows two examples of magnetic bearings: a conventional bearing with an external moving part and a hybrid bearing with the control coils placed in the stationary part of the bearing.…”

“…They show that the induced voltage and magnetic flux related to the machine axes d and q -and, consequently, to the electromagnetic torque depend on the flux from permanent magnets and the current in the excitation coil [18,19]. Information about transformation from threephase (L1 -L2 -L3) system to two phase (α-β) system, and then to d-q axis, are described in details e.g., in [20], The mathematical description (voltage equations) of magnetic bearings is very similar to the description of hybrid-excited electric machines due to the appropriate selection of the coordinate system (rotating with the rotor). The main goal in magnetic bearings is to maintain a constant air gap, while in hybrid-excited machines, it is to obtain the required values of the magnetic flux.…”

“…They show that the induced voltage and magnetic flux related to the machine axes d and qand, consequently, to the electromagnetic torque depend on the flux from permanent magnets and the current in the excitation coil [18,19]. Information about transformation from three-phase (L 1 -L 2 -L 3 ) system to two phase (α-β) system, and then to d-q axis, are described in details e.g., in [20],…”