Title :
New SVPWM control scheme for three-phase diode clamping multilevel inverter with balanced DC voltages
Author :
Botao, Miao ; Congwei, Liu ; Yang, Zhang ; Fahai, Li
Author_Institution :
Tsinghua Univ., Beijing, China
Abstract :
This paper presents a new SVPWM control scheme for three-phase diode clamping multilevel inverters. First, it is proved that if the switch states are selected in a given mapping relation, the voltages of DC capacitors will be symmetrical. Voltage offsets of each two symmetrical capacitors fluctuate at the three-time frequency of AC currents. This rule can be applied to N-level (N>2) inverters and simplify the approach to solve unbalanced capacitor voltages. Then based on it, a new control strategy is presented to maintain the balanced voltages on the four DC capacitors of a diode clamping five-level inverter. Finally an experiment drive system is implemented on a TMS320F240 DSP in the Lab. The validity of the proposed method is demonstrated by simulation and experimental results.
Keywords :
PWM invertors; capacitors; digital control; digital signal processing chips; power semiconductor diodes; voltage control; AC currents; DC capacitors; SVPWM control scheme; TMS320F240 DSP; balanced DC voltages; control strategy; diode clamping five-level inverter; mapping relation; switch states; symmetrical DC capacitor voltages; symmetrical capacitors; three-phase diode clamping multilevel inverter; three-time frequency; unbalanced capacitor voltages; voltage offsets; Capacitors; Clamps; Digital signal processing; Diodes; Frequency; Pulse width modulation inverters; Space vector pulse width modulation; Switches; Topology; Voltage control;
Conference_Titel :
IECON 02 [Industrial Electronics Society, IEEE 2002 28th Annual Conference of the]
Print_ISBN :
0-7803-7474-6
DOI :
10.1109/IECON.2002.1185392
