Ruben Antonio Chaer

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• MSc. Engenier
• Professor (Associate) at Universidad de la República de Uruguay

This work shows the planning process and the subsequent operation of the electro-energy system of Uruguay with installed wind and solar energy capacity similar to the peak demand of the system. In this work, we present the series of studies and considerations in the planning process of the expansion of investments that allowed us to be aggressive i...

Este trabajo presenta un método para completar series de datos en forma óptima utilizando un modelo CEGH previamente calibrado para representar las relaciones de las series entre si y con sus pasados.

The optimal operation of the electro-energetic generation system involves the application of a Operation Policy (OP). A OP is the criterion to indicate the resources used to supply electricity demand at all times. Given the system's ability to store energy (mainly in the reservoirs of hydroelectric plants), a OP should consider postponing or advanc...

Modelado de procesos estocáticos aplicable a la simulación de sistemas de energía eléctrica como ser modelado de aportes hidráulicos a centrales hidroeléctricas, de velocidad de viento en parques eólicos y de radiación solar en granjas fotovoltaicas.

The Electric Power System Simulator (SimSEE) is a model that optimizes and simulates the operation of an electric system and has been widely used to analyze the integrated power system in Uruguay. Among the stochastic processes that SimSEE needs to represent are the streamflow inputs to the hydroelectric dams, which constitute a key factor for both...

Estimating CO2 emission factor of the electricity system is a key aspect in the calculation of the baseline emissions for projects certified as CDM (Clean Development Mechanism), which replace energy from the grid. Currently, Uruguay is driving the expansion of the electricity system based on domestic renewable energies, in addition to replacing oi...

The system of electric power generation of Uruguay will verify significant changes in the near future. The main one will be the incorporation of a large amount of wind power. The stated goal is to reach 1200 MW of installed capacity by 2015. The expected demand for that year is about 1495 MW on average, with a peak of 2000 MW. The wind penetration...

Hydrothermal systems optimal operation includes a step of optimizing the resources that are valued system storable. This optimization is performed traditionally by a stochastic dynamic programming in which the objective function to minimize is the expected value of future cost of operation, also known as Bellman function. While in theory, minimize...

This paper analyzes the current energy matrix (year 2012) and the projected to 2015 of the power generation sector in Uruguay. The analysis is performed from the point of view of cost and risk exposure of the country and the utility UTE. The most relevant components of the cost and volatility and ways to mitigate cost risk taken are shown.

This paper presents an estimate of the value of information of the hourly wind forecast of the next three days when the forecast is used in the programming task of the operation of the generation system. The value of information is measured as the expected future operating costs without having the forecast minus the expected future operating cost w...

This work analyzes the necessary and sufficient conditions for the stability of the stochastic dynamic optimization algorithm for the calculus of the water cost for one hydroelectrical generation plant. We present the theory and different simulations for parameters inside and outside the stability region. A particular relationship between the time...

A simplified model of a hydroelectric generation plant with an associated reservoir, developed for the SimEnerg simulator for didactic purposes, is presented. SimEnerg was originally developed for simulating autonomous wind and solar systems. Due to this, it was necessary to improve it in order to handle integrated generation systems. A brief descr...

Se desarrolla un modelo en el espacio de estado de un controlador ripple constante para un convertidor DC-DC que alimenta un motor de corriente continua con excitación independiente. El controlador esta destinado al manejo del convertidor para regular la velocidad o el par del motor. Fue implementado usando una estrategia de control a ripple fijo,...

Estimación de una cota inferior de la cantidad de simulaciones para lograr con una confianza dada, que el error en la determinación del valor esperado de una variable sea inferior a un valor dado. Proyecto SimMEEP – Dpto. Potencia-IIE-FING-UDELAR Ing. Ruben Chaer. Marzo 1992. Este trabajo resume resultados de estadística básica y muestra como calcu...

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Este trabajo expone una primera aproximación a un modelo de series de aportes hidráulicos a las centrales de generación hidroeléctrica del Uruguay, considerando su relación con el fenómeno ENOS a través de la incorporación del índice Niño 3.4. Se presenta una metodología de evaluación de los potenciales beneficios logrados por la mejora en los mode...

This work describes two tools developed to de sign and evaluates of photovoltaic installations. They were developed as an agreement between our Institute and the public power utility (UTE) in order to make rural electrification in areas far from the network using alternative power. In o rder to de sign this kind o f installations here we de scribe...

This work describes a methodology and a software tool-kit (SimEnerg) for the design of autonomous electricity systems. A crite-rion for comparing autonomous against grid connected systems is given, based on the annual energy deficit of the system with a given confidence. As an example, a map for choose the best technology with given power demand an...

RESUMEN. Este trabajo describe el software Hybrid 95 y como se utiliza a los efectos del diseño de sistemas híbridos. Como ejemplo de aplicación se recorren algunas de las etapas del diseño (determinación del recurso eólico, simulaciones para el dimensionado de generación/acumulación y topología) de la instalación de Potrerillo. Teniendo en cuenta...