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Analiza mogućnosti postojanja paralelnog rezonantnog kola u RHE Bajina Bašta
Analysis of the possibility of a parallel resonant circuit in RHPP Bajina Bašta
Sažetak
Pokretanje reverzibilnih agregata u režimu pumpi u RHE Bajina Bašta se vrši preko statičkog frekventnog pretvarača (SFP). To je rezultiralo povećanjem nivoa viših harmonika u okviru RHE. Međutim, nije bilo poznato da li rad ovog SFP-a može ugroziti rad potrošača koji se napajaju iz pomenute RHE preko distributivnog transformatora. U tu svrhu, bilo je potrebno proveriti mogućnosti postojanja paralelnog rezonantnog kola, kako u samoj RHE, tako i u delu distributivne mreže koji je bio od interesa. Analize su izvršene u formiranom linearnom simulacionom modelu u softverskom paketu DIgSILENT PowerFactory. Simulacioni model je formiran tako da odgovara stanju minimalnog opterećenja distributivnog područja koje se napaja iz TS Metaljka. Takođe analizirano je nekoliko uklopnih stanja u TS Đurići (odakle se napajaju pumpe u filterskom postrojenju). Rezultati pokazuju postojanje paralelne rezonance u okolini 13. harmonika na nivou 10 kV sabirnica u TS Metaljka, dok na sabirnicama prema prenosnom sistemu nije identifikovano postojanje rezonance, što je u skladu sa merenjima.
Abstract
The pumps in RHPP Bajina Bašta are started via a static frequency converter (SFC). This resulted in increased level of higher harmonics within the RHPP. However, it was not known whether the operation of this SFP could endanger the consumers supplied from the mentioned RHPP via the distribution transformer. For this purpose, it is necessary to check the possibilities of the existence of a parallel resonant circuit, both in the RHPP itself, and in the part of the distribution network that was of interest. Analyzes were performed in the linear simulation model created in the DIgSILENT PowerFactory software package. The simulation model was created so that it corresponds to the state of minimum load of the distribution area supplied by TS Metaljka. Also, several variants were analyzed in TS Đurići (depending on the number of motor engines in operation). The results show the existence of parallel resonant circuit in the vicinity of the 13th harmonic at the level of 10 kV busbars in TS Metaljka, while its existence was not identified at the transmission system busbar, which is in accordance with the measurements.
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