Abstract
The use of renewable energy, within nowadays energy policy, has increased considerably all over the world in order to respond to the increasing energy consumption and to reduce the environmental impact of the electricity generation. At the beginning, the relatively low penetration levels of distributed generation does not produce problems, however, the nowadays massive increase of local power generation have led to new integration challenges in order to ensure the reliability and quality of the power supply. This paper also highlights some aspects regarding the use of the active distribution networks of low voltage to which electric energy producers are connected-the prosumers: advantages and disadvantages for the consumer and for the supplier, technical requirements for connection, identification of the problems of power quality.
Highlights
In recent decades, climate changes, rising prices on gas and oil and a growing demand for energy have become the most important topics for the international community
Current energy policies and technical developments have led to a significant increase in distributed generation based on renewable energy sources (RES); the integration of distributed generation (DG) systems into the public networks is important because they reduce the environmental impact and allow the introduction of RES into distribution networks
The use of DG units represents the transition from passive distribution networks to active distribution networks
Summary
Climate changes, rising prices on gas and oil and a growing demand for energy have become the most important topics for the international community One solution to these problems represents the local generation of electrical power at the distribution networks level, using alternative energy resources. Rapid variations), voltage unbalance, frequency variations, harmonics and interharmonics, network availability and load, reactive power flow, etc According to this concept, power is generated in small volume units, located in most cases near the users and connected to the medium or low voltage networks. A part of the energy demand is covered by classical power plants and the rest is produced near the users; if local generation exceeds consumption, the power circulates towards higher voltage levels. Network stability: It implies the contribution of the DG units to the level of the network stability as well as the functioning capability within generating unit defect
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