Odpravljanje preobremenitev v elektroenergetskem omrežju s pomočjo agregatorjev. (Slovenian)

The paper proposes a power-congestion-management method utilizing dispersed small-scale aggregators, either residential, commercial or small industrial. It is based on the assumption that the system operator performs redispatching of generators, loads and aggregators to minimum-cost. To calculate the power flow the power system is linearized and presented by a DC model. In this way, the power transfer distribution factors and topological generation and load distribution factors describing the relation between generators/loads/aggregators and line power flows are applied. Two optimizations are made to release the power congestion. The upper-level optimization foresees a bid-based redispatching, while the low-level optimization provides an optimal bid for aggregators with multiple connection points to the transmission network and the power injected synchronously at different locations. The applicability of the proposed optimizations made by using linear programming is tested on a simple power-system model. [ABSTRACT FROM AUTHOR]

Sistemski operaterji v okviru zagotavljanja zanesljivega obratovanja elektroenergetskih sistemov spremljajo razmere na vodih in transformatorjih ter v primeru preobremenitev izvedejo primerne ukrepe, ki vključujejo tudi prerazporeditev moči med generatorji, bremeni in agregatorji. S tem se tudi pretoki moči po omrežju prerazporedijo tako, da se kritične povezave razbremenijo. Angažiranje generatorjev, bremen in agregatorjev se izvaja tržno, kar pomeni, da vsi zainteresirani za izvajanje sistemske storitve razbremenjevanja omrežja podajo ponudbo na dražbi, ki jo izvede sistemski operater in s katero izbere najprimernejše ponudnike. članek predstavlja dvonivojski optimizacijski model, pričemer je spodnji nivo namenjen oblikovanju konkurenčne ponudbe agregatorja, zgornji nivo pa predstavlja model dražbe sistemskega operaterja. Ključni prispevek raziskave je model agregatorja, ki ima več priključnih točk na prenosno omrežje, saj so njegovi člani razpršeni po celotnem distribucijskem omrežju. Model temelji na uporabi distribucijskih faktorjev, ki izhajajo iz enosmernega izračuna pretokov moči in predstavljajo vpliv moči proizvajalcev in odjemalcev na obremenitev prenosnih poti. Ker je problem linearen, se ga rešuje z linearnim programiranjem. Njegova uporabnost je preizkušena na enostavnem testnem modelu elektroenergetskega sistema. [ABSTRACT FROM AUTHOR]

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