Abstract
A two-stage cascaded converter is formed by connecting two sub-converters in series. Output impedance of one sub-converter will therefore interact with input impedance of the other sub-converter. Such interaction may affect the system dynamics and stability, especially when one sub-converter is constant-power-controlled, and hence has different impedance characteristics when its power reverses. To lessen such constant-power effects, a control scheme that can coordinate impedance behaviors of the two sub-converters is proposed. The idea is to reshape the lowfrequency negative impedance of the constant-power subconverter to a positive resistance needed for neutralizing stability differences between the two directions of power flow. A smooth power reversal can thus be ensured, as verified through simulations and experiments performed with a scaled-down 400-W laboratory prototype.
| Original language | English |
|---|---|
| Journal | I E E E Transactions on Industry Applications |
| Volume | 52 |
| Issue number | 5 |
| Pages (from-to) | 4084 - 4095 |
| Number of pages | 12 |
| ISSN | 0093-9994 |
| DOIs | |
| Publication status | Published - Sept 2016 |
Keywords
- Bidirectional control
- Cascaded converter
- Impedance interaction
- Impedance control
- System stability