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Algorithm of reactive power dispatching "per generator" realization on TPP Nikola Tesla A
Algoritam realizacije raspodele reaktivne snage "prema generatoru" u termoelektrani Nikola Tesla A
aUniversity of Belgrade, Faculty of Electrical Engineering + University of Belgrade, Electrical Engineering Institute 'Nikola Tesla' bJavno preduzeće Elektroprivreda Srbije, Ogranak Termoelektrane Nikola Tesla, Obrenovac cUniversity of Belgrade, Electrical Engineering Institute 'Nikola Tesla'
email: jelena.pavlovic@ieent.org
Abstract
The algorithm of reactive power dispatching "per generator" realization is presented in the paper. Dispatching "per generator" and "per grid" are two modes of reactive power dispatching used by coordinated reactive power and voltage regulator (GRRS). Reactive power dispatching "per generator" ensures equal heating of the generators, while dispatching "per grid" ensures maximal reactive power reserve when generated reactive power either increases, or decreases. Reactive power dispatching "per generator" is more complex for realization because the dispatching criterion may have wider generator's reactive power operation area than the working capability curve. In these cases, the additional limiting of the generator reactive power is necessary, while other generators take over the remaining reactive power, still considering the reactive power dispatching criteria "per generator" and the limits of the remaining generators. Both reactive power dispatching modes are presented in two examples, while operating near and far from the limit area. Eventually, as the verification of the algorithm and its realization, the operating results of GRRS while dispatching "per generator" is active, are presented.
Sažetak
U radu je prikazan algoritam realizacije raspodele reaktivne snage "prema generatoru". Raspodela "prema generatoru" i raspodela "prema mreži" su dva načina raspodele reaktivne snage koje koristi grupni regulator reaktivne snage (GRRS). Raspodela "prema generatoru" obezbeđuje ravnomerno grejanje generatora dok raspodela "prema mreži" obezbeđuje maksimalnu rezervu reaktivne snage i u pravcu povećanja i u pravcu sniženja generisane reaktivne snage. Raspodela reaktivne snage "prema generatoru" je kompleksnija za realizaciju jer se može desiti da kriterijum raspodele obuhvata širu radnu oblast generatora po reaktivnoj snazi od pogonske karte. U tim situacijama je potrebno uvesti dodatno ograničenje reaktivne snage generatora, dok drugi generatori preuzimaju preostalu reaktivnu snagu, i dalje poštujući kriterijume raspodele reaktivne snage "prema generatoru" i vodeći računa o ograničenjima preostalih generatora. Metode raspodele reaktivnih snaga ilustrovane su primerima rada van i u graničnom režimu. Na kraju su prikazani rezultati rada GRRS kada je aktivna raspodela "prema generatoru", kao verifikacija algoritma i njegove realizacije.
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