Extreme overirradiance events in Sao Paulo, Brazil

Phenomena of overirradiance have been pointed all over the World. This note presents the most extreme enhancement event reported in Brazil, which contains an irradiance reading of 1590 W/m2 measured in São Paulo (latitude 23°32′S) at relatively low altitude (760 m a.s.l.)

PV power forecast using a nonparametric PV model

Forecasting the AC power output of a PV plant accurately is important both for plant owners and electric system operators. Two main categories of PV modeling are available: the parametric and the nonparametric. In this paper, a methodology using a nonparametric PV model is proposed, using as inputs several forecasts of meteorological variables from a Numerical Weather Forecast model, and actual AC power measurements of PV plants. The methodology was built upon the R environment and uses Quantile Regression Forests as machine learning tool to forecast AC power with a confidence interval. Real data from five PV plants was used to validate the methodology, and results show that daily production is predicted with an absolute cvMBE lower than 1.3%

Using a nonparametric PV model to forecast AC power output of PV plants

In this paper, a methodology using a nonparametric model is used to forecast AC power output of PV plants using as inputs several forecasts of meteorological variables from a Numerical Weather Prediction (NWP) model and actual AC power measurements of PV plants. The methodology was built upon the R environment and uses Quantile Regression Forests as machine learning tool to forecast the AC power with a confidence interval. Real data from five PV plants was used to validate the methodology, and results show that the daily production of individual plants can be predicted with a skill score up to 0.361

Desempenho operacional de motobomba vibratória para pequenos sistemas fotovoltaicos

Este trabalho apresenta a avaliação do desempenho de um sistema de bombeamento fotovoltaico com bomba submersa vibratória em corrente contínua (CC) de baixa potência. Os ensaios foram realizados em uma bancada desenvolvida para este fim capaz de manter estável a altura manométrica (pressão de trabalho), independente da variação da irradiação solar incidente. Os dados de vazão, altura manométrica, tensão, corrente CC e irradiância foram registrados através de um datalogger no intervalo de 06:00 h às 18:00 h, considerado um turno de bombeamento. Apesar de limitações como altura manométrica e diâmetro do poço, o sistema analisado é competitivo com outras opções de bombeamento e apresenta como nicho de mercado localidades rurais com baixa demanda hídrica.This paper presents the performance evaluation of a photovoltaic pumping system with submerged vibrating pump for direct current (DC) low power application. The tests were performed on a bench designed for this purpose which can provide stable head (working pressure), regardless of the variation in incident solar radiation. Flow, head, DC voltage and current, and irradiance data were recorded using a datalogger from 06:00 h to 18:00 h, considered to be a pumping shift. In spite of limitations such as the head and the diameter of the well, the system under consideration is competitive with other pumping options and features as niche market rural areas with low water demand.Este trabajo presenta la evaluación del desempeño de un sistema fotovoltaico de bombeo con bomba sumergible vibratoria para aplicaciones de baja potencia en corriente continua (CC). Las pruebas se realizaron en un banco diseñado para este propósito, proporcionando altura manométrica estable (presión de trabajo) independientemente de la variación de la radiación solar incidente. Los datos de caudal, altura manométrica, tensión continua, corriente continua e irradiación solar se registraron con un sistema de adquisición de datos en el periodo de 06:00 h a 18:00 h, considerado como un ciclo de bombeo.A pesar de las limitaciones de la altura manométrica y del diámetro del pozo, el sistema en cuestión es competitivo con otras opciones de bombeo y tiene como nicho de mercado las zonas rurales que necesitan menores cantidades de agua.Asociación Argentina de Energías Renovables y Medio Ambiente (ASADES