Abstract
Pulse-width modulated ac drives equipped with a small dc-link capacitor are becoming an attractive solution for electric drive applications with moderate requirements for shaft dynamic performance. However, when these drives are fed from a weak grid, a resonance between the line side impedance and the dc-link capacitor appears. Due to this resonance, the total harmonic distortion and the partially weighted harmonic distortion of the line currents are increased, which may raise compatibility problems with the ac line harmonic standards. This paper proposes a novel dc-link voltage compensation method, which can reduce the amplitude of the aforementioned oscillation, while the large dc-link voltage variation, caused by the rectification, can be eliminated from the motor current. The method has been experimentally validated and the results show excellent performance. © 2017 IEEE.
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Industry Applications |
| Volume | 53 |
| Issue number | 4 |
| Pages (from-to) | 3814-3820 |
| Number of pages | 7 |
| ISSN | 0093-9994 |
| DOIs | |
| Publication status | Published - Jul 2017 |
Keywords
- Fluctuating dc-link voltage
- Reduced dc-link capacitor
- Slim dc-link drives
- Voltage-source inverter (VSI)
- Capacitance
- Drives
- Electric drives
- Electric inverters
- Electric rectifiers
- Harmonic analysis
- Harmonic distortion
- Resonance
- Attractive solutions
- Compatibility problems
- Dc link capacitor
- DC links
- DC-link voltages
- Pulse-width-modulated
- Total harmonic distortion (THD)
- Voltage source inverter
- AC motors