Abstract
This paper analyses the impact on renewable energy sources integrated into the Romanian power system on the electrical network operation considering the reduction of electricity consumption with respect to the 1990s. This decrease has led to increased difficulties in integrating the renewable energy sources into the power system (network reinforcements), as well as issues concerning the balance of production/consumption. Following the excess of certain proportions of the energy mix, intermittent renewable energy sources require the expansion of networks, storage, back-up capacities and efforts for a flexible consumption, in the absence of which renewable energy sources cannot be used or the grid can be overloaded. To highlight the difficulty of connecting some significant capacities installed in wind power plants and photovoltaic installation, the paper presents a case study for Dobrogea area that has the most installed capacity from renewable energy sources in operation.
Highlights
The European Union (EU), at the beginning of 2017, reviewed the Renewable Energy Directive2009/28/EC for increasing the target of the share of renewable energy sources in the overall energy mix to at least 27% in 2030 and to become the world leader in renewable energy [1]
This paper investigates the operation of an area of the Romanian power system characterised by a high density of renewable energy sources
The south-east part of the Romanian power system is a particular area characterised by a very high density of renewable energy sources and a nuclear power plant with two units. This power system area is connected to the rest of the country through three highly loaded transmission lines: two are supplying the city of Bucharest, and one is supplying the north-east side of Romania with a deficit in production
Summary
The European Union (EU), at the beginning of 2017, reviewed the Renewable Energy Directive2009/28/EC for increasing the target of the share of renewable energy sources in the overall energy mix to at least 27% in 2030 and to become the world leader in renewable energy [1]. The interconnection of the high share of renewable energy sources in the existing power systems is a timely topic, with particular solutions applicable for each country. The analysis of interconnection of a large share of renewable energy sources into Greek power systems was investigated in [2], highlighting the impact of wind generators on power system adequacy and secure operation. The renewable energy sources have an intermittent character and their operation in the power system requires additional balancing actions, function of the available measures in the country of origin and net transfer capacity with the neighbouring countries [5]. The analysis of wind farm integration into the California power system on the electricity market, balancing market and ramping necessities is investigated in [8]
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