Abstract
The paper presents to develop a new control strategy of limiting the dc-link voltage fluctuation for a back-to-back pulsewidth modulation converter in a doubly fed induction generator (DFIG) for wind turbine systems. The reasons of dc-link voltage fluctuation are analyzed. An improved control strategy with the instantaneous rotor power feedback is proposed to limit the fluctuation range of the dc-link voltage. An experimental rig is set up to valid the proposed strategy, and the dynamic performances of the DFIG are compared with the traditional control method under a constant grid voltage. Furthermore, the capabilities of keeping the dc-link voltage stable are also compared in the ride-through control of DFIG during a three-phase grid fault, by using a developed 2 MW DFIG wind power system model. Both the experimental and simulation results have shown that the proposed control strategy is more effective, and the fluctuation of the dc-link voltage may be successfully limited in a small range under a constant grid voltage and a non-serious grid voltage dip.
| Original language | English |
|---|---|
| Journal | IEEE Transactions on Power Electronics |
| Volume | 23 |
| Issue number | 3 |
| Pages (from-to) | 1205–1213 |
| ISSN | 0885-8993 |
| DOIs | |
| Publication status | Published - 2008 |
Keywords
- Back-to-back pulsewidth modulation (PWM)
- DC-link voltage
- Doubly fed induction generator
- Instantaneous power feedback
- Ride-through control
- Wind power generation