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A new method for power-transformer modelling over a wide range of frequency up to 1 MHz is presented in this paper. The goal is to develop an appropriate model for transient investigations and insulation-coordination studies in power systems. The Model provides suitable facilities for power system operators and is based on the measurement results in the frequency-domain from 10 Hz up to 1 MHz. The...
The modeling of wind power plants incorporating synchronous generator and full-converters for using in power system simulations is presented in this paper. In other words, all components of the above-mentioned power plant using typical values as well as their corresponding control systems are in details modeled and also simulated. The control strategy of the variable-speed wind turbine is the maximum...
In this paper, the maximum thrust force per ampere (MTPA) strategy for saturated permanent magnet linear synchronous motors over the entire field weakening region is presented. In other words, influence of magnetic saturation on the MTPA and field weakening strategies as well as motor-inverter limitations is considered. Using the modified MTPA strategy leads to minimized copper losses, and so maximum...
As the development of microprocessors, power electronic converters and electric motor drives, electric power steering system which uses an electric motor came to use a few year ago. Electric power steering systems have many advantages over traditional hydraulic power steering systems in engine efficiency, space efficiency, and environmental compatibility. This paper deals with design and optimization...
Here, a new fuzzy direct torque control algorithm for induction motors is proposed. As in the classical direct torque control, the inverter gate control signals directly come from the optimum switching voltage vector look-up table, the best voltage space vector selection is a key factor to obtain minimum torque and flux ripples. In the proposed approach the best voltage space vector is selected using...
This paper presents an optimum direct thrust force control for interior permanent magnet linear synchronous motor (PMLSM) over wide velocity range in which the maximum thrust force per ampere (MTPA) strategy is used below the base velocity and field weakening strategy is used above the base velocity. Using MTPA strategy, copper losses is minimized in constant force region, and using field weakening...
This paper presents a novel sensorless control method for brushless DC motors using two similar fuzzy logic-based neural network observers. Firstly, two fuzzy logic observers are designed and used to estimate back-EMF space vector components in the stationary reference frame. The inputs of the observers are measured values of line to line voltages and currents, and their outputs are back-EMF space...
The development in the technology of power semiconductors results in their application in FACTS devices, static switches, hybrid switches, HVDC, and high power converters. Since the nominal current of such devices does not satisfy high power applications, in order to increase the current ratings, switches should be paralleled. In this paper, the behavior of the paralleling of devices such as diodes,...
In this paper, a high power single switch flyback power supply is presented. Performance of this power supply in continuous conduction mode is investigated in implementation. An appropriate efficiency is achieved by designing a proper snubber circuit. With regard to the importance of reliability in switch mode power supplies, reliability consideration is discussed for this high power flyback in details...
In this paper, a new approach to the synchronous reluctance motor control that ensures the production of maximum torque over the entire field weakening region is presented. In other words, this paper presents an optimal control scheme for wide speed range operation of synchronous reluctance motor drives, where current vector is directly controlled. The proposed scheme possesses some attractive features...
The main theme of this paper is to present a novel controller, which is a genetic based fuzzy Logic controller, for interior permanent magnet synchronous motor drives with direct torque control. A radial basis function network is used for online tuning of the genetic based fuzzy logic controller. Initially different operating conditions are obtained based on motor dynamics incorporating uncertainties...
A radial basis function network for online tuning of a genetic based fuzzy logic controller for interior permanent magnet synchronous motor drive over wide speed range is presented in this paper. Initially different operating conditions are obtained based on motor dynamics incorporating uncertainties. At each operating condition, a genetic algorithm is used to optimize fuzzy logic controller parameters...
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