Title :
DC-Link Capacitance Minimization in T-Type Three-Level AC/DC/AC PWM Converters
Author :
Alemi, Payam ; Yoon-Cheul Jeung ; Dong-Choon Lee
Author_Institution :
Dept. of Electr. Eng., Yeungnam Univ., Gyeongsan, South Korea
Abstract :
In this paper, a novel control algorithm that minimizes the dc-link capacitance in the T-type three-level back-to-back converter is proposed. For this, the charging and discharging currents through the capacitor should be minimized, which can be achieved by utilizing the power balance of the ac/dc converter. Then, the voltage variation in the dc-link is also decreased, which makes a significant reduction in the size of dc-link capacitors. With this scheme, the electrolytic capacitors can be replaced by film capacitors, which are of higher power density, longer lifetime, and higher reliability. The effectiveness of the proposed strategy has been verified by the simulation and experiment results for a 3-kW T-type three-level ac/dc/ac pulsewidth modulation converter system with a 50- μF film capacitor in the dc-link.
Keywords :
AC-DC power convertors; DC-AC power convertors; PWM power convertors; capacitance; electrolytic capacitors; reliability; DC-link capacitance minimization; T-type three-level AC-DC-AC PWM converter; T-type three-level back-to-back converter; capacitance 50 muF; charging current minimization; control algorithm; discharging current minimization; electrolytic capacitor; film capacitor; higher power density; higher reliability; longer lifetime; power 3 kW; power balance; pulsewidth modulation converter system; size reduction; Capacitance; Capacitors; Films; Integrated circuits; Inverters; Pulse width modulation converters; Voltage control; AC/DC/AC conversion; T-type converter; dc-link capacitance; film capacitor;
Journal_Title :
Industrial Electronics, IEEE Transactions on
DOI :
10.1109/TIE.2014.2345354
