Efficiency and recuperation capabilities of modern electrical drives have become very important features within variable speed drive applications. Regenerative electrical drives are therefore usually equipped with cost extensive pulsed active front end topologies for the recuperation mode. Contrarily, the much cheaper fundamental frequency switched front end is used. It has no electrolytic capa...

A high dynamic control system for the Alspa VDM 7000 medium voltage drive was implemented, which provides fast torque response times of a few milliseconds despite the typically low switching frequency of GTO thyristors that is necessary to achieve high efficiency. The drive system consists of a three-level voltage source converter with active front-end and a synchronous motor. The drive has mos...

Frequency converters provide means for the energy efficient flow and pressure control in pumping and fan systems by varying the motor speed. Besides speed variation, a modern frequency converter can estimate the state and performance of system operation without additional measurement sensors. This ability provides several possibilities to optimize pumping or fan system operation and the resulti...

This project deals with modelling and performance evaluation of solar powered BMBLDC drive systems using MATLAB and its toolbox SIMULINK. The system consist of mathematical model of photo voltaic source, boost converter, BLDC motor, inverter, current controller an speed/torque controller is used for proposed model of solar powered PMBLDC drive system. The motor is controlled through a hysteresi...

The aim of this paper is to analyze the influence of some parameters related with the permanent magnet motor control, which are being considered as an attractive alternative for electrical vehicle application where it is important to minimize the losses to increase the vehicle autonomy. In this paper, the attention is focused on the selection of the speed controller parameters and its impact bo...

This paper carves out the design of unity power factor controller for three phase variable speed induction motor drive. SPWM technique is used to improve the power factor of the system to unity and hysteresis controller is used for speed control of the drive. These control techniques lead to a unity power factor seen by the ac supply and minimize the power loss, audible noise, and motor torque ...

DC drives are still very important, especially for low voltages and low power (e.g. in cars and robots). In this paper a converter is analyzed, which makes it possible to control the voltage across the machine (and therefore the speed) from zero to more than two times the input voltage with a nonlinear, flat dependence at low duty cycles. This enables one to achieve high torque at low speeds wi...

This paper describes fuzzy logic control of induction generator speed in wind turbine application. The aim of fuzzy controller is to establishe maximum power delivery to the grid from available wind power. Fully-controlled wind turbine which consists of induction generator and back-to-back converter is under estimate. This configuration has full control over the electrical torque, full control ...

The proper functioning of a catalytic converter requires precise regulation of A/F to the stoichiometric value. The control of A/F is usually based on regulating the fuel ow in proportion to air ow changes imposed by the driver. However, due to the relatively long time delays in the fuel feedback loop, the controller cannot properly compensate for rapid air ow changes. To overcome this de cienc...

We developed an accurate, efficient and flexible modeling method for the steady-state and transient analysis of grid-connected superconducting synchronous machines. On the one hand, the machine flux linkages and electromagnetic torque as function of operational parameters are obtained from static finite element analysis and stored in lookup tables. On the other hand, the machine is represented ...