A 3-phase buck-boost converter for lowering the input current distortion of a voltage source inverter drive
- Univ. of Alberta, Edmonton (Canada). Dept. of Electrical Engineering
- Univ. of Calgary, Alberta (Canada). Dept. of Electrical and Computing Engineering
This paper presents a 3-phase buck-boost switchmode converter that lowers the input harmonics drawn by a voltage source pwm inverter drive. The buck-boost converter examined, rated with a 0.26 per-unit current and drawing 6% of the total drive input power, is connected in parallel with the drive`s main diode bridge and LC filter, 94% of the drive power is drawn through the diode rectifier. The low electrical stresses associated with the buck-boost converter, in addition to the small number of high frequency switching components, makes the drive topology robust, conducive to soft-switching techniques and lowers the generation of emi-rfi. The rectifier topologies are suitable for regulating the dc voltage rails for 2-level and 3-level inverters. For 3-level inverter drives using a center-tapped capacitor dc-rail, the proposed rectifiers can compensate for load imbalances and maintain equal voltage drops across the two dc-rails. Since the buck-boost switchmode converter is separate from the main drive diode rectifier, the drive can continue to operate satisfactorily even if the buck-boost converter fails. This same feature makes the buck-boost converter unit suitable as a drive option or for retrofitting. The drive configurations examined in the paper are verified with experimental results and Spice simulations.
- OSTI ID:
- 427946
- Report Number(s):
- CONF-9510203--
- Country of Publication:
- United States
- Language:
- English
Similar Records
Reliable 3-phase PWM boost rectifiers employing a stacked dual boost converter subtopology
Single-switch 3{phi} PWM low harmonic rectifiers