Search results for "Power Balance"
showing 3 items of 3 documents
Supplementary frequency regulation in non-synchronous AC system connected via MTDC
2019
Abstract In smart grid power system operation, frequency regulation is one of the most critical tasks towards power balance in the grid. This paper presents the schemes for improvement in operation of secondary loop of turbine-generator unit for frequency regulation in non-synchronous AC areas connected via multi-terminal direct current (MTDC) network. Two schemes have been discussed; (i) voltage droop based lead/lag compensator and (ii) DC power modulation at converter terminal depending upon frequency deviation from each AC area. In the first scheme, droop design based on lead/lag compensator using DC voltage deviation is introduced as supplementary signal at turbine-generator unit in eac…
Élites di governo e «mastre» ad Agrigento fra Trecento e Quattrocento
2002
ITALIANO: Sebbene le comunità demaniali siciliane acquisiscano un peso centrale ed inedito nei regni di Martino e di Alfonso V, a parte poche eccezioni mancano ricerche monografiche e comparate delle dinamiche sociali cittadine. Questo articolo prende in esame la città di Agrigento, in particolare la formazione dei raggruppamenti sociali, il loro differente ruolo politico e gli equilibri di potere tra i gruppi di governo, con riferimento alle istituzioni delle liste di eleggibili per l'elezione alle cariche locali. È opinione comune che le istituzioni di tali liste rappresentino l'affermazione della aristocrazia, sugli altri raggruppamenti sociali, nelle dinamiche urbane sin dalla seconda m…
Driven Primary Regulation for Minimum Power Losses Operation in Islanded Microgrids
2018
The paper proposes an improved primary regulation method for inverter-interfaced generating units in islanded microgrids. The considered approach employs an off-line minimum losses optimal power flow (OPF) to devise the primary frequency regulation curve’s set-points while satisfying the power balance, frequency and current constraints. In this way, generators will reach an optimized operating point corresponding to a given and unique power flow distribution presenting the minimum power losses. The proposed approach can be particularly interesting for diesel-based islanded microgrids that face, constantly, the issue of reducing their dependency from fossil fuels and of enhancing their gener…