Mapas escalares de un convertidor elevador en modo corriente

"En esta contribución se analiza una clase de mapa escalar obtenido a partir de las formas de onda del convertidor elevador controlado en modo corriente pico sin rampa estabilizadora. Se establecen condiciones necesarias y suficientes para caracterizar el comportamiento estable y periódico del ciclo de trabajo. Las propiedades geométricas de los mapas escalares son ilustradas con mapas iterativos.

Control basado en reglas para la generación de señales de disparo para un inversor monofásico con seguimiento de fase

Actualmente, las energías renovables son ampliamente explotadas debido a la escases de los combustibles fósiles. Mediante un sistema fotovoltaico es posible generar energía eléctrica a partir de la energía solar. La energía eléctrica generada debe cumplir con las características de la red eléctrica para poder ser inyectada a la misma. Por esta razón, se requiere un inversor que convierta la energía de CD a CA. La estrategia de control empleada juega un papel fundamental ya que determina la forma de onda de CA generada por el inversor a partir del voltaje de cd. Tradicionalmente se han empleado esquemas de control basados en técnicas PWM. Sin embargo, la naturaleza no lineal de estos sistemas impone un reto para obtener una solución óptima. Por otro lado, las soluciones obtenidas por medio de técnicas de inteligencia artificial y soft computing han mostrado muy buenos resultados en este tipo de problemas. En este trabajo se presenta un control basado en reglas para generar lasseñales de disparo para un inversor monofásico con seguimiento de fase. El algoritmode control que determina las señales de disparo es programado en un microcontroladorPIC

Convertidor elevador: mapa unidimensional y dinámica no lineal

"En esta contribución se realiza el desarrollo de un mapa discreto en el tiempo del convertidor elevador controlado en modo corriente pico a partir de sus formas de onda. Se presentan criterios de existencia de puntos fijos, puntos periódicos y su estabilidad. Las propiedades geométricas del mapa discreto son ilustradas mediante ejemplos de simulación.

Two-Feeder Dynamic Voltage Restorer for Application in Custom Power Parks

The custom power park (CPP) is a concept that has been developed for the purpose of dealing with power quality problems. The CPP is powered by two independent feeders and consists of different types of custom power devices for compensation (dynamic voltage restorer, DVR) and reconfiguration (static transfer switch, STS). Normally, the loads are fed by the preferred feeder (PF) through the STS. When a fault occurs in the PF, the STS performs a reconfiguration of the feeders and feeds the load with an alternate feeder. In this paper, a two-input DVR based on the matrix converter is proposed to provide stable voltage to the load. Each of the DVR inputs is connected to a different feeder, and the PF powers the load. Thus, the DVR has an operational behavior like the STS when reconfiguring the energy transfer of the two feeders and injects it into the PF to guarantee a stable voltage in the load. The control algorithm in the DVR is performed in the dq reference frame to have a unit power factor in feeders and load. The modulation schemes are based on space vector modulation and modified carrier based pulse width modulation. The efficiency and multifunctionality of the proposed DVR is corroborated by simulations on the MATLAB/Simulink

A Two-Grid Interline Dynamic Voltage Restorer Based on Two Three-Phase Input Matrix Converters

Energy quality problems can cause diverse failures of sensitive equipment. Dynamic voltage restorers (DVRs) are devices that have been proposed to protect sensitive loads from voltage sag effects. However, the compensation capacity of DVRs is limited by the amount of energy stored in the restorer. One way to overcome this limitation is to use the interline DVR (IDVR) structure in which two or more DVRs connected to different feeders share a common DC-link. This paper proposes a new IDVR topology based on two three-phase input matrix converters (TTI-MC) without a capacitor in the dc-link. The TTI-MC integrates the power from two feeders and synthesizes the dc-link voltage. The inverters take the dc-link voltage and generate the appropriate compensation voltages to keep the load voltages stable. Each one of the inverters has its own modulation algorithm which are synchronized with the TTI-MC control. Inverter control is carried out in the reference frame dq and a modified space vector pulse width modulation (MSV-PWM) technique is used. TTI-MC control is performed in the dq reference frame with proportional-integral controllers and the modulation is based on the carrier-based pulse width modulation (MCB-PWM) technique. The proposed Two Input Interline DVR (TI-IDVR) extends its compensation range and has multifunctional capabilities. The efficiency of the proposed TI-IDVR is corroborated by simulations on MATLAB/Simulink