It is inevitable though that with changes, new problems are acquired and need to be addressed. The high penetration of renewables in the electricity supply system could create issues of instability to the grid, which is not designed to receive such integration. The problem requires an immediate attention in order to meet the target of 2020 or even exceed it. There are researches [4] that present scenarios for 2030 and 2050, when renewable electricity supply could be 68% and 100% respectively. It is understood then that more modern electricity grid system should be adopted, which means expansion of the grid but more important implies urgent modification of the already existing one.