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http://dx.doi.org/10.5370/KIEE.2018.67.2.209

Voltage Balancing Control of Input Voltage Source Employing Series-connected Capacitors in 7-level PWM Inverter  

Kim, Jin-San (Dept. of Control and Instrumentation Engineering, Hanbat National University)
Kang, Feel-soon (Dept. of Electrical and Electronic Engineering, Hanbat National University)
Publication Information
The Transactions of The Korean Institute of Electrical Engineers / v.67, no.2, 2018 , pp. 209-215 More about this Journal
Abstract
This paper present a 7-level PWM inverter adopting voltage balancing control to series-connected input capacitors. The prior proposed 7-level PWM inverter consists of dc input source, three series-connected capacitors, two bidirectional switch modules, and an H-bridge. This circuit topology is useful to increase the number of output voltage levels, however it fails to generate 7-level in output voltage without consideration for voltage balancing among series-connected capacitors. Capacitor voltage imbalance is caused on the different period between charging and discharging of capacitor. To solve this problem, we uses the amplitude modulation of carrier wave, which is used to produce the center output voltage level. To verify the validity of the proposed control method, we carried out computer-aided simulation and experiments using a prototype.
Keywords
Multilevel inverter; Voltage imbalance; Capacitor;
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