Abstract
The impact of the current and switch state of cascaded STATCOM on DC-side voltage is analyzed. When converter current I>0 and module output voltage U>0, DC capacitor is charged and its voltage rises; when I>0 and U<0, DC capacitor is discharged and its voltage drops; when I<0, the situation is opposite. A DC voltage balancing strategy based on swap redundant switching states is thus proposed, which changes the switch state of the module with high DC voltage into the switch state causing voltage dropping while changes the switch state of the module with low DC voltage into the switch state causing voltage rising. The charge/discharge time of capacitor is thus changed and the DC-side voltage balance is maintained. The proposed control strategy is simple and easy to realize and its effectiveness is verified by simulative results.
| Original language | English |
|---|---|
| Pages (from-to) | 33-37 |
| Number of pages | 5 |
| Journal | Dianli Zidonghua Shebei/Electric Power Automation Equipment |
| Volume | 31 |
| Issue number | 11 |
| State | Published - Nov 2011 |
| Externally published | Yes |
Keywords
- Cascaded multilevel
- DC capacitor voltage
- Electric inverters
- Redundancy
- STATCOM
- Voltage control
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