Title :
Analysis of capacitor dividers for multilevel inverter
Author :
Sivkov, Oleg ; Pavelka, Jiri
Author_Institution :
Fac. of Electr. Eng./Dept. of Electr. Drive & Traction, Czech Tech. Univ., Prague
Abstract :
This paper analyses a possibility for realization of multilevel inverters. After general description of all famous solutions, the focus is paid on diode clamped multilevel inverters (DCMI) and flying capacitor multilevel inverters (FCMI). The comparison of topological structure differences and control strategies is presented. The special focus is paid to balancing of voltages on capacitors. Switching states and their transitions of three-level inverter allow to balance capacitor voltages in both types of inverters, DCMI and FCMI, where DCMI requires less capacitor power size than FCMI to achieve the same capacitor voltage swinging. However in higher-level DCMI (more than 3) capacitor voltage balancing generally is not able. FCMI control strategy is possible for all level. Special control strategy for five-level DCMI capacitor voltage stabilization is briefly described. Advantages and disadvantages of DCMI and FCMI are compared for the same output power.
Keywords :
invertors; power capacitors; switching convertors; voltage control; DCMI control; FCMI control; capacitor dividers; diode clamped multilevel inverters; flying capacitor multilevel inverters; switching state transition; voltage balancing; voltage stabilization; Active filters; Capacitors; Circuit topology; Coupling circuits; Diodes; Power transformer insulation; Pulse width modulation inverters; Switches; Switching circuits; Voltage control; Active filter; Adjustable speed drive; Converter circuit; Converter control; Design; High Voltage power converters; IGBT; IGCT; Multilevel converters; Unified Power Flow controller;
Conference_Titel :
Power Electronics and Motion Control Conference, 2008. EPE-PEMC 2008. 13th
Conference_Location :
Poznan
Print_ISBN :
978-1-4244-1741-4
Electronic_ISBN :
978-1-4244-1742-1
DOI :
10.1109/EPEPEMC.2008.4635270