Aplicação da estratégia de controle zero grid em uma usina de microgeração voltada a redução do consumo diurno

Abstract

This paper addresses the zero grid export control strategy in a solar plant, where this strategy aims to generate energy according to the load consumption in real time, without any injection into the grid of the concessionaire. For its implementation, it is necessary that the photovoltaic inverter has the capacity to control the amount of energy it will generate and has connections that can receive information and com mands from a smart meter. In this application, the equipment is connected to the grid of the concessionaire so that it can adjust its parameters to operate in parallel with the grid. The analysis will be carried out of the application of a distributed solar photovoltaic microgeneration plant that uses the zero grid export control strategy to reduce the value of a consumer's energy bill. The consumer had a photovoltaic plant on site, but planned to increase its consumption due to the water park that was going to be installed in the project. There was only one more area on site to be used for the expansion of the system, and after analyzing the size of this area, it was detected that in order to carry out a traditional on-grid expansion, it would be necessary to replace the private transformer, thus generating additional costs. As an option to avoid this cost, it was suggested that the expansion be carried out using the zero grid export strategy, since the new consumption would be higher during the day and thus it would be possible to use the total area that was still remaining without the need to replace the transformer. For this application, where future consumption will be very high, the export control will make the photovoltaic inverter generate its maximum, although it may happen that the generation is not capable of meeting the instantaneous energy consumption. When this occurs, the utility grid acts as a “plan B” and supplies the remaining energy needed, generating consumption that is recorded by the energy me ter. This case will be observed to identify some characteristics of this type of application and its viability.