High performance position control for permanent magnet synchronous drives

In the design and test of electric drive control systems, computer simulations provide a useful way to verify the correctness and efficiency of various schemes and control algorithms before the final system is actually constructed, therefore, development time and associated costs are reduced. Nevertheless, the transition from the simulation stage to the actual implementation has to be as straightforward as possible. This document presents the design and implementation of a position control system for permanent magnet synchronous drives, including a review and comparison of various related works about non-linear control systems applied to this type of machine. The overall electric drive control system is simulated and tested in Proteus VSM software which is able to simulate the interaction between the firmware running on a microcontroller and analogue circuits connected to it. The dsPIC33FJ32MC204 is used as the target processor to implement the control algorithms. The electric drive model is developed using elements existing in the Proteus VSM library. As in any high performance electric drive system, field oriented control is applied to achieve accurate torque control. The complete control system is distributed in three control loops, namely torque, speed and position. A standard PID control system, and a hybrid control system based on fuzzy logic are implemented and tested. The natural variation of motor parameters, such as winding resistance and magnetic flux are also simulated. Comparisons between the two control schemes are carried out for speed and position using different error measurements, such as, integral square error, integral absolute error and root mean squared error. Comparison results show a superior performance of the hybrid fuzzy-logic-based controller when coping with parameter variations, and by reducing torque ripple, but the results are reversed when periodical torque disturbances are present. Finally, the speed controllers are implemented and evaluated physically in a testbed based on a brushless DC motor, with the control algorithms implemented on a dsPIC30F2010. The comparisons carried out for the speed controllers are consistent for both simulation and physical implementation

Diseño e implementación de un sistema para la adquisición, análisis y almacenamiento de información eléctrica en cargas residenciales y compensación automática del factor de potencia

Se ha diseñado e implementado un prototipo basado en controladores digitales de señales dsPIC, con la finalidad de registrar en función del tiempo la información de parámetros eléctricos: tensión RMS, corriente RMS, factor de potencia y distorsión armónica total de tensión y corriente; de una carga tipo residencial. El almacenamiento de la información eléctrica se realiza utilizando una memoria tipo flash micro SD de 2GB de capacidad que permite un registro continuo por un lapso de tiempo máximo de 6 meses. El formato de almacenamiento de los datos en la memoria micro SD es de tipo texto (archivos .txt), con el objetivo de poder realizar análisis de los mismos en cualquier programa computacional que acepte este formato. Para facilitar el tratamiento de la información, un archivo adicional es generado cada nuevo día (paso por las 00H00)durante el proceso de almacenamiento de los datos. Además,se ha diseñado e implementado un circuito de control para el comando de un banco de condensadores basado en mediciones a tiempo real del factor de potencia, con elpropósito de mantener dicho factor en un nivel óptimo. Finalmente, se han diseñado dos placas de circuito impreso o PCB: la placa del circuito principalque es la encargada de adquirir y almacenar la información de los parámetros eléctricos, y la placa para el comando y control del banco de condensadoresque es la encargada de activar o desactivar cada uno de los capacitores.A prototype based on dsPIC digital signal controllers has been designed and implemented in order to log,in function of time, the electrical data: RMS voltage, RMS current, power factor, and total harmonic distortion of voltage and current, of a residential electrical load. The electrical data are saved in a flash type microSD memory card with 2GB of capacity that allows a continuous log of the electrical parameters for a maximum period of six months. The data saving format on the microSD memory card is a text type format (files .txt) in order to allow a data analysis in any computer program that supports this format. To handle the data in an easier way, an additional data file is generated every new day (past 00H00) in the data log process. A control circuit for a capacitor bank has also been designed and implemented based on the real time measurements of the power factor in order to maintain this power factor in an optimum level. Finally, two printed circuit boards have been designed namely: the main board circuit which is the responsible of acquiring and saving the electrical data, and the drive circuit board for the capacitor bank which is the responsible of connecting or disconnecting every capacitor.Ingeniero EléctricoCuenc