DocumentCode :
1382342
Title :
Application of Balancing Circuit for DC-Link Voltages Balance in a Single-Phase Diode-Clamped Inverter With Two Three-Level Legs
Author :
Stala, Robert
Author_Institution :
Dept. of Electr. Drive & Ind. Equip., AGH Univ. of Sci. & Technol., Krakow, Poland
Volume :
58
Issue :
9
fYear :
2011
Firstpage :
4185
Lastpage :
4195
Abstract :
This paper presents investigations of dc-link voltages balance with the use of a passive RLC circuit in a single-phase diode-clamped inverter composed of two three-level legs. Application of the balancing circuit in the diode-clamped inverter needs proper PWM generation but the modulation method is the same for both in the balanced and unbalanced state. This method of dc-link voltages balance does not need any measurements or additional control, and this ensures fast response and low energy losses. This paper also presents mathematical analysis of the PWM modulation method and the inverter operation, and an analytical description of the natural balancing process with contribution of the load current and the balancing circuit current. Simulations and experimental results of the inverter with FPGA-based control are presented to confirm the effectiveness of the natural balancing process.
Keywords :
PWM invertors; field programmable gate arrays; mathematical analysis; DC-link voltages balance; PWM generation; balancing circuit; energy losses; load current; natural balancing process; passive RLC circuit; single-phase diode-clamped inverter; three-level legs; Capacitors; Converters; Inverters; Pulse width modulation; RLC circuits; DC-link voltage balance; diode-clamped inverter; multilevel systems; natural balancing; neutral-point clamped (NPC); neutral-point clamped inverter;
fLanguage :
English
Journal_Title :
Industrial Electronics, IEEE Transactions on
Publisher :
ieee
ISSN :
0278-0046
Type :
jour
DOI :
10.1109/TIE.2010.2093477
Filename :
5639076
Link To Document :
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