The operation of a power distribution system with a large number of distributed generation units copes with problems as voltage rising, short-circuit currents increasing, changes of power losses or power quality and reliability problems. When considering these issues, it is important to take into account that existing power network regulatory framework are presently set for the one-way model. The power distribution grids operator can make decisions related to the distributed generation units’ integration by estimating the maximum value of these units’ capacity that can be tolerated by the distribution grid without violating its operational constraints. The paper presents an approach to quantify the technical impacts of small power generation units embedded in low voltage (LV) grids. The analysis is based on a methodology that estimates the limits by relating to a CIGRE benchmark grid.

The actual operation of the power distribution systems asks for high standards concerning the performance of the system in terms of continuity and safety in supplying consumers on the one hand and the quality of the delivered energy on the other hand. Thus, the paper aims to present a complete analysis of the impact that the modification of the neutral treatment system in a 110 kV / MV station belonging to Energy Distribution Oltenia (DEO), has on both the number and the type of unwanted events or phenomena as well as on the network parameters and the transient regime which occurs as a result of some defects with the earth. All of these have been analyzed taking into account the new performance standards that distribution systems have to respect.

The actual operation of the power distribution systems asks for high power quality (PQ). This fully justifies the investments in improving the metrics of power grid performances. But maintaining a PQ data infrastructure in a numerous locations is time-consuming and prohibitive. Moreover, each PQ monitor releases its own data format. These considerations justified using of a central PQ management system able to manipulate elliptical and time discontinuous information. The paper presents the characteristics of a webbased application designed to collect the data measured with different technologies of monitors and translate them into a common PQ data interchange format allowing comprehensive and long-duration grid operation assessment. The unitary formatted data generated by this customized software tool can be further processed by a proprietary software platform for PQ management owned by the network operator. The present version of this conversion tool is applicable only for one product family operating in the local power distribution grid. Further development is planned for integrating other two monitor vendors/families.