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There are two control objectives in active rectifiers: DC regulation and power factor correction, however it is difficult to reach both objectives simultaneously. In this paper is presented the use of an observer based control for complete both control objectives. A proporcional integral (PI) control is applied to regulate DC voltage and a hysteresis based control for improve the power factor. Experimental...
The development of power and energy management policies in vehicular applications has become an attractive area of research in the last decade. Due to the fact that no single power source fuel cell, batteries or supercapacitor can give the best option in terms of power density during a normal driving of an electric vehicle. In this paper are proposed three novel methods to manage the power in a fuel...
The use of electric differential constitutes a technological advance of vehicle design along the concept of more electric vehicles. Electric differentials have the advantages of replacing loosy, heavy and inefficient mechanical transmission and mechanical differential with a more efficient, light and small electric motors directly coupled to the wheels via a single gear or an in-wheel motor. To date,...
Our current research is using accelerated life testing as the main tool for the evaluation of the reliability of electronic components. However, accelerated testing does not necessarily reflect the real effect that time has on devices. We have obtained a large sample of passive and active components from a recently upgraded industrial facility. These components have been under uninterrupted service...
The main purpose of this paper is to present a step by step design procedure of an experimental EV powered by two electronically independent controlled induction machines. Additionally efforts are focused to develop high performance, low price traction system with low losses needed in the propulsion system. Emphasis in developing an EV it is based in its high efficiency (above 80%) compared with HEV...
An active rectifier has two control objectives: current tracking and voltage regulation. Against dynamic nonlinear loads or voltage sags it is difficult to achieve both objectives. This paper deals whit analysis, design and implementation a passivity-based control to track a current reference and a PI controller to regulate de DC bus voltage. Moreover, the bus regulation has adequately performance...
A fast detection algorithm for sags, swells and interruptions is developed in this paper. The proposed method is based on the combination of the digital RMS technique and the Kalman filter. The union of these methods allows using the main advantages of Kalman filter and RMS techniques and helps rejecting the extreme drawbacks of Kalman filter. The proposed approach can be applied to dynamic voltage...
In this paper, the performances of two rotor flux and speed estimation methods used in speed sensorless vector controllers of induction motors are compared. Both Kalman filter (KF) and model reference adaptive system (MRAS) are the estimation methods discussed and compared at the same conditions. The comparative study is done by means of stability, sensitivity to parameter variation and behavior in...
The speed controlled AC drives without mechanical speed sensors have the attraction of low cost and high reliability. The sensorless control techniques require of the estimation of internal state variables of the machine like the linkage fluxes and the rotor speed. Generally, the estimation of the rotor speed is achieved through only the measurement of voltages and currents. Robustness of the open...
A fast detection algorithm for sags, swells and interruptions is developed in this paper. The proposed method is based on the combination of the digital RMS technique and the Kalman filter. The union of these methods allows using the main advantages of Kalman filter and RMS techniques and helps rejecting the extreme drawbacks of Kalman filter. The proposed approach can be applied to dynamic voltage...
Voltage sags are one of the most important power quality problems, affecting industrial and commercial customers. Industrial processes are particularly sensitive to relatively minor voltage sags. Utilities have been improved their fault-recovery capabilities, however it is still impossible to eliminate faults in the systems. Therefore, customers will have to improve the ride-through capability of...
Voltage sags are one of the most important power quality problems, affecting industrial and commercial customers. These events are usually associated with a fault somewhere on the supplying power system. Industrial processes are particularly sensitive to relatively small voltage sags; therefore, customers will have to improve the ride-through capability of the system equipment in their facilities...
In order to get a cost competitive commercial product based in III-V solar cells, a complete assessment of their reliability must be done. A full strategy of tests has been designed to tackle this matter. Real time and homologated accelerated tests are ongoing, as well as a complete statistical analysis which will establish the main reliability parameters and the failure mechanisms
Multi-motor applications are already a "true" option in highly demanding devices by replacing mechanical coupling. Here, electronic virtual line-shafting (EVLS) to synchronize two independent induction motors (IM) wheels for an electric vehicle feed (considering the flat ride case) by a single inverter is presented. Feasibility and practical limitations are analyzed in a laboratory set-up
The main purpose of this paper is to present a simple strategy to control speed of parallel connected multi-induction motor fed by a single inverter. In this paper, it is proposed a novel "smart" switching strategy to control the voltages necessities of each motor and it is applied the electronic virtual line shafting (EVLS) for speed synchronization. Simulation and experimental constrains...
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