Abstract
Most distributed-generation facilities are performed on pre-built distribution grids. The design conditions of these existing grids may limit the ability of new users to get a connection due to technical and/or cost constraints. This work proposes a simple solution, adjusted to the relevant regulations and embodied in a radial distribution grid of Spanish low voltage, to improve the interconnection of distributed generation, usually grid connected photovoltaic systems. The proposed solution, based on increasing the section of the neutral line, achieves a capacity of increasing the length of the supply grid by more than 20%.
Highlights
According to previous studies [1,2], the production of renewable energy sources (RES) in Europe, and in Spain [3], will increase their portion of the total energy consumption from10.5% in 2008 to 22.7% in 2020
The conductors used are made of aluminum, with insulation strength of 0.6/1 kV, and XLPE insulation; the sections used in this case study are 150 mm2 and 240 mm2, according to the particular norms of the distribution company [29]
The study begins by calculating for overloads and it is considered that the line will be the maximum of its capacity for overloads, the minimum length line is calculated from the conditions of the voltage drop and short circuit
Summary
According to previous studies [1,2], the production of renewable energy sources (RES) in Europe, and in Spain [3], will increase their portion of the total energy consumption from10.5% in 2008 to 22.7% in 2020. According to previous studies [1,2], the production of renewable energy sources (RES) in Europe, and in Spain [3], will increase their portion of the total energy consumption from. The cost of wind energy could be 7 c€ ̈ kWh1 with an investment cost between 860 and 920 € ̈ kW1 , while the cost of photovoltaic solar energy would be around 12.9 c€ ̈ kWh1 with an investment cost of 0.15 € ̈ W1. The present work examines photovoltaic grid-connected systems (PVGCSs), though it can be applied to other distributed generation (DG) technologies. The increase in the distributed-generation capacity means economic profits well as technical benefits [8,9,10]. The optimal location and size may serve multiple objectives such as reducing grid losses, updating the net value of production, and the knowledge of the distance to the point of collapse [14,15,16,17,18,19]
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