OPTIMAL AND QAUSI-ENERGY-SAVING CONTROL POSATION VARIABLE FREQUENCY ASYNCHRONOUS MOTORS

Energy Saving in Evaporative Coolers using Permanent Magnet Brushless Motors

Due to low cost, evaporative coolers are used in most of the central regions and in the warm and dry climate of Iran and are considered as one of the major consumers of electrical power. Most evaporative coolers use single-phase induction motors by connecting directly to the power grid. But their eefficiency is very low, and their replacement with high efficiency electric motors is considered b...

Performance Evaluation of Induction Motors Under Optimal-Energy Control

This paper presents experimental results of a nonlinear torqueux optimal control for induction motor drives. This controller, minimizes the stored magnetic energy and the coil losses, while satisfying torque tracking control objectives [2]. The optimal control calculates and imposes time-varying (torque-reference depending) rotor ux norms. The controller is a cascadebased scheme with tree main ...

Optimal Control of a Variable-Speed Wind Energy Conversion System: A New Approach

The operation of wind energy conversion systems mainly deals with variable and unpredictable wind regimes resulting in variable power efficiency. In addition, nowadays with the presence of high penetration level of wind farms integrated to power systems, stability and power quality problems might be addressed, when a disturbance event occurs. These challenges are worsened with significant degre...

Energy Efficiency of Electric Vehicles – Energy Saving and Optimal Control Technologies

Analysis in Time-Frequency Domain of Asynchronous Motors Control with Inverter Switching at Zero Voltage

The objectives of this paper consists in the analysis in time-frequency (TF) domain of asynchronous motors control with inverter switching at zero voltage. Analysis of nonstationary signals is of great interest in many areas, but it can be extremely useful for power electronics. The study of these phenomena typically involves the analysis in time-frequency because it can give an overview of the...