Journal of Sustainable Energy

5

Authors: FETEA M., MARE R.

The paper is structured in five parts. In the first part is evoked the importance and presented some aspects from stability theory. In the second part are presented the general model designed by the author with the principal loads. In part three are presented the model for evaluation taking into account the forces given by the wind loads. In part four are given the results obtained using an analytical method neglecting the forces given by the wind loads. Are calculated the dimensions of the diameter and also is verified the section. In part number five the authors presents the conclusions.

7

Authors: RADULESCU V.

The present paper is structured in six parts. In the first part are mentioned the topic importance and the new problems appeared into last decades, related to the environmental problems in natural or hydropower lakes. This new solution using renewable resources based on PV-photovoltaic panels intends to resolve these aspects. As area for testing were selected two natural reservations lakes. Based on some experimental measurements made during three months in 2015, was determined the quality of water, main parameters, presented in part two. In the third part are briefly presented the actual environmental conditions and in part four the effects on the active sludge deposits appeared due excess developed vegetation. In part five is presented the prototype model used to solve the local problem, to collect, compact and partially dry the active sludge. The extracted sludge can be in short time integrally consumed for agricultural purpose, as ecologic and nutritive fertiliser as to restore the agriculture lands. The sludge, knew in the past for its therapeutic utilisation, more then one hundred ago, nowadays due ecological and biological changes lost his efficiency. The reconstruction of the local ecologic balance and for the sludge to recover its therapeutic properties using renewable resources without disturb the environment are the main objectives of this research. Finally some conclusions and references are presented.

7

Authors: POP O., BARBULESCU C., KILYENI ST., VERNICA A.

The interconnected capacity and transmission cost allocation is tackled in this paper. Two methods are involved: distribution factors and equivalent bilateral methods. For the beginning, the mathematical model, allocation methods and software tool are presented. In the following, a comparison between the two allocation methods is performed. Three power system operating conditions are analysed. Real large scale case study has been used. It has been modelled based on the Western, South-Western sides of the Romanian Power System. Useful results for interconnection capacities allocated to generators and their related cost have been provided.

8

Authors: GAVRILAS. M., GRIGORAS GH., CAZACU M., CARP C.O., ANDREI I.

The paper presents the results of the implementation of a program for reducing technical active energy losses in the distribution network operated by Delgaz Grid DSO (Distribution System Operator). Measures applied to reduce technical losses addresses both transformers at the MV / LV transformer substations and the LV network power lines. The impact of these measures has been assessed using pilot networks with structures and electrical characteristics known in detail. For the phase load balancing measure two methods have been proposed, one based on a bottom-up constructive approach and the other based on identifying a (sub)optimal solution using meta-heuristic techniques.