Study of low-voltage distribution grid connection dimensioning principles considering distributed generation in Finland

Solar photovoltaics are becoming increasingly popular on household customers. The distribution networks have been planned for unidirectional power delivery. The solar photovoltaics can cause voltage problems if network capacity is not sufficient. In Finland, the basis of network dimensioning principles considering solar PV systems has been based on equation that estimates the level of rapid voltage fluctuations caused by solar PV system with short-circuit power of the customer connection. This paper presents results of research project “Distribution grid dimensioning principles considering wide-spread distributed solar photovoltaics generation” focusing on the effects of single high-capacity PV systems compared with network capacity. This paper presents a study of update needs of present grid dimensioning recommendation. We evaluate the theoretical background of the parameterization choices in the recommendation. The main finding of this paper is that there are potential update needs in the parameterization of the recommendation.