Abstract
Modular multilevel converter (MMC) is regarded as an emerging topology in medium-voltage (MV) variable-speed motor drive applications, particularly for driving fan-/pump-like loads. The main challenge is the large capacitor voltage ripple of MMC at low speed with high starting torque. In this brief, a simple and cost-effective modified MMC topology is introduced, which can provide high toque to motor during the zero/low frequency. The topology is particularly suitable for fan-/pump-like loads. Circuit structure and operation principle of this modified topology is explained, and the control schemes are also developed. Validity and effectiveness of this topology are verified by experimental results.
| Original language | English |
|---|---|
| Article number | 9352970 |
| Pages (from-to) | 2493-2497 |
| Number of pages | 5 |
| Journal | IEEE Transactions on Circuits and Systems II: Express Briefs |
| Volume | 68 |
| Issue number | 7 |
| DOIs | |
| State | Published - Jul 2021 |
| Externally published | Yes |
Keywords
- Capacitor voltage ripple
- capacitor pre-charge
- fan-/pump-like loads
- modular multilevel converter (MMC)
- motor drive
- startup
- zero/low speeds
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