Search results for "landed"

A distributed minimum losses optimal power flow for islanded microgrids

2017

Abstract In this work, the minimum losses optimal power dispatch problem for islanded microgrids with distributed energy resources (DER) is solved by means of a distributed heuristic approach. Optimal power management is performed almost in real time, with a predefined schedule, i.e. every 5 min, and the solution is applied to generators when the current operating solution violates voltage or current constraints or when the current configuration produces too large power losses. The operating point of both inverter-interfaced generation units as well as rotating production systems can be modified simply using local information. The latter are voltage measurements and power injections or load…

INVERTER-BASED DISTRIBUTED GENERATORS, MODELING AND CONTROL

In the last few years, electrical power generation is moving from a centralized generation towards distributed generation including on-site Renewable Energy Sources (RESs). In order to overcome RES related issues, as intermittent and fluctuating power, storage elements are included in the on-site generation system. The interaction between distributed generator (DG) units including RES, storage and front-end power converters should be carefully modeled in order to analyze the power system stability. An accurate modeling of DGs is required. In this thesis, a new modeling approach has been proposed for the inverter-based DGs based on the concept of electrostatic synchronous machines. Detailed …

REGULATION DROOP COEFFICIENTS IN ISLANDED MICROGRIDS

In this thesis, a novel non-linear droop control is proposed. The droop curve is generated as a piecewise linear curve from the optimized operating points of the system under consideration for different values of the supplied load. For each Optimal Power Flow (OPF), the droop coefficients are generated and these create small piecewise linear parts of the final droop curve. The operation is constrained by frequency and voltage limits. It is well known that the load flow problem solution can provide infinite operating points if the generators set point is not fixed. For each loading condition, the solution to the OPF problem outputs a single solution. Such solution, in case of microgrids with…

Abuso del diritto e diritto penale: un pericoloso ossimoro.

2020

L’articolo tratta del delicato e complesso concetto di abuso del diritto, nato nel campo del diritto civile e poi approdato in sede penale nel settore del diritto penale tributario. Nell’articolo si ritiene che tale nozione non è compatibile con i princìpi fondamentali del diritto penale italiano e che, pertanto, non vi dovrebbe avere ingresso.

Obraz życia ziemiaństwa rosyjskiego w świetle wspomnień Zofii Kowalewskiej

2017

Artykuł przedstawia obraz życia ziemiaństwa rosyjskiego w latach 60. XIX wieku na przykładzie Wspomnień z dzieciństwa Zofii Kowalewskiej (1850-1891), wybitnej rosyjskiej matematyczki, utalentowanej pisarki i publicystyki. Autorka zapisków okres dzieciństwa i wczesnej młodości spędziła na obrzeżach imperium carskiego, w rodzinnym majątku Palibino. We wspomnieniach memuarystka ukazuje przede wszystkim środowisko, z którego się wywodzi, prezentuje sposób wychowania i kształcenia szlacheckich dzieci, charakteryzuje atmosferę domu rodzinnego, przedstawia formy spędzania czasu wolnego, spośród których najważniejsze to: czytanie książek zgromadzonych w domowej bibliotece, spotkania towarzyskie ora…