Browsing by Author "Bilgin, Mert Serdar"

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DC-link capacitor lifetime under various operating conditions
(IEEE, 2019) Bilgin, Mert Serdar; Poyrazoğlu, Göktürk; Aktem, M.; Er, E.; Electrical & Electronics Engineering; POYRAZOĞLU, Göktürk; Bilgin, Mert Serdar
A grid-tied DC/AC converter transfers the energy to the power system under different operating conditions such as DC-Link voltage level, power factor, and instability in the grid voltage. There are some effects of the operating conditions to the DC-Link capacitor lifetime. The DC-Link capacitor current characteristic is affected by the operating conditions. In this paper, the DC-Link capacitor lifetime and current ripple are observed under different DC-Link voltage level, power factor and grid conditions for grid-tied 10kVA DC/AC converter. Simulation results are shown and interpreted.
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Investigation on the effects of dc-link capacitors to DC/AC converter under various operation conditions
(2019-05-29) Bilgin, Mert Serdar; Poyrazoğlu, Göktürk; Poyrazoğlu, Göktürk; Uğurdağ, Hasan Fatih; Tekin, Ahmet; Boztepe, M.; Tamer, Ö.; Department of Electrical and Electronics Engineering; Bilgin, Mert Serdar
In the designing stage of a DC/AC converter, determining parameters of components has an essential role such as value, size and material type. DC-Link capacitors are the critical components for DC/AC converters and define the lifetime of the converter. A grid-connected converter must provide related standards and grid regulations done by operating country even though poor operating conditions. Effective power generation through a grid-tied DC/AC converter faces many challenges that cause less lifetime and improper working of the device due to several factors including but not limited to unstable grid voltage, change of DC input voltage and different power factors. Grid voltage unbalance causes higher THD values on grid currents than normal grid conditions. THD value of grid current is limited by the IEEE 519-2014 standard. Unstable grid conditions show different results because of the value and type of DC-Link capacitors. In this thesis, after the introduction of topologies, basics of control methods, PWM methods of a DC/AC converter then two types of capacitors (electrolytic and film capacitors) are compared with different grid voltage conditions and power factor values for grid-tied 10 kVA DC/AC converter. On the other hand, the lifetime calculation theory of an electrolytic capacitor is interpreted and calculations are done for electrolytic capacitors in different operating conditions. Lastly, an unbalance voltage controller added to the system to observe effects on output current quality for an electrolytic DC-Link capacitor. All the work is done by simulation software PLECS, results are compared and explained.