Identifikacija degradacij večvejnega enosmernega presmernika v realnem času

magistrsko delo

Samo Smodiš (Author), Peter Zajec (Mentor)

Abstract

V delu je raziskana možnost nadzora stanja in diagnostike močnostnih pretvornikov v realnem času. Metoda je primerna za večvejne DC/DC pretvornike, omogoča pa določitev veje pretvornika, v kateri prihaja do povečanih izgub, ki jih povezujemo z nastajajočimi degradacijami komponent in približujočimi se okvarami. Izpeljani analitični izrazi omogočajo vpogled v medsebojni vpliv posameznih veličin in parametrov pretvornika in na njihov vpliv na zaznavo degradacije. Na podlagi izpeljanih izrazov so izrisani grafi, s katerimi je pridobljen dodaten vpogled v povezavo med merjenimi veličinami in degradacijo komponent. Natančnost analitičnih napovedi je preverjena s simulacijo modela realnega stikalnega pretvornika v programskem okolju Ansys Simplorer. Doseženo je zadovoljivo ujemanje med analitično napovedjo in simulacijskimi rezultati, kar nakazuje na to, da so privzete primerne poenostavitve pri analitični obravnavi, saj je njihov vpliv predstavljal minimalno odstopanje od končnih rezultatov simulacije. Rezultati potrjujejo domnevo, da je možno le na podlagi meritve vhodne moči zaznati nastajoče degradacije pretvornika. Metoda omogoča zaznavo degradacije do nivoja veje pretvornika, za določitev degradirane komponente znotraj veje pa je potrebno nadaljnje delo. V delu je uspešno prikazana izvedljivost in uporabnost metode za spremljanje stanja komponent v realnem času, ki jo je možno izvajat med nazivno obremenitvijo pretvornika in po takem ne zahteva zaustavitve industrijskih procesov, katerih sestavni del je močnostni pretvornik.

Keywords

večvejni DC/DC pretvornik;diagnostika v realnem času;kroženje moči;simulacijski modeli;magisteriji;

Data

Language:	Slovenian
Year of publishing:	2021
Typology:	2.09 - Master's Thesis
Organization:	UL FE - Faculty of Electrical Engineering
Publisher:	[S. Smodiš]
UDC:	621.3(043.2)
COBISS:	90856195
Views:	182
Downloads:	36
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Real-time identification of degradation in an interleaved DC/DC converter
Secondary abstract:	The thesis addresses a new method of on-line condition monitoring and diagnostics for power converters. The proposed method requires an interleaved topology and it enables the determination of the branch in which additional power losses are generated due to degradation of components. First, the method is described, along with a detailed analytical analysis. Afterwards, analytical results are validated with a simulation model of a buck converter with realistic component models. Analytical expressions were derived in order to gain a better understanding of importance and cross-corelation of converter parameters and variables that determine the degradation of components. The effects of converter parameters on the measured variables representing degradation are further evaluated via graphical representation. The accuracy of analytical expressions was compared with the results of numerical simulations of a buck converter with realistic component models in Ansys Simplorer. The matching of obtained analytical and simulation results implies that the approximations, that have been made during analytical analysis, have little effect on the end result. This thesis shows that the proposed method can be used as an on-line condition monitoring tool, which does not require disconnecting the load from the power converter. Instead, the monitoring and diagnosis can be done without any interference to the nominal operation condition of the power converter. Consequently, there is no need to stop the industrial process, just to take the measurements for condition assesment.
Secondary keywords:	Interleaved converter;condition monitoring;online diagnostics;simulation model;
Type (COBISS):	Master's thesis/paper
Study programme:	1000316
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za elektrotehniko
Pages:	XVI, 34 str.
ID:	14167734