Abstract
This paper presents a capacitor voltage balancing control applicable to any multilevel dc–ac converter formed by a single set of series-connected capacitors implementing the dc link and semiconductor devices, such as the diode-clamped topology. The control is defined for any number of dc-link voltage levels and converter legs (for single-phase and multiphase systems), guaranteeing the capacitor voltage control for any modulation index value and load (from idle mode to full power). The associated control loop small-signal transfer function is presented, from which optimum compensator design guidelines are derived. The improvement in control performance is verified through simulation and experiments comparing with a previous balancing control strategy in a four-level three-phase dc–ac conversion system. The satisfactory control performance is also verified through simulation in a four-level five-phase dc–ac conversion system.
| Original language | English |
|---|---|
| Journal | I E E E Transactions on Industrial Electronics |
| Volume | 62 |
| Issue number | 5 |
| Pages (from-to) | 2663 - 2672 |
| Number of pages | 10 |
| ISSN | 0278-0046 |
| DOIs | |
| Publication status | Published - May 2015 |
Keywords
- Active-clamped
- Capacitor voltage balance
- Diode-clamped
- Multilevel
- Pulsewidth modulation
- Pulsewidth modulation (PWM)
- Virtual vector