Abstract
Conventional direct power control methods in unbalanced grid voltage conditions have undesirable effects on the performance and power quality of wind power plants based on DFIG. In this paper, a control algorithm based on direct power control for DFIG in unbalanced grid voltage conditions is presented with the aim of reducing the output power oscillations and current THD of back-to-back converters. For this purpose, the oscillatory component of DC link power in unbalanced condition at the grid voltage is identified from its fixed value and is added as a compensator to the reference value of input power of the hysteresis controller as part of the grid side converter controller. In addition to reducing the power oscillations of grid side convertor and its current THD, the proposed method decreases the current THD from DFIG and does not impose any additional oscillation in different parts of DFIG. The proposed control algorithm is simply implemented on conventional direct power control methods in unbalanced grid voltage conditions to improve its performance. Also, the results show that, using the proposed method, in addition to controlling the output power of DFIG and back-to-back converter, the output power oscillations and current THD of back-to-back converters are reduced simultaneously, and the output current become more sinusoidal.
| Original language | English |
|---|---|
| Pages (from-to) | 2228-2238 |
| Number of pages | 11 |
| Journal | International Journal of Renewable Energy Research |
| Volume | 8 |
| Issue number | 4 |
| Publication status | Published - 1 Dec 2018 |
| Externally published | Yes |
Keywords
- Active and reactive power oscillations
- Direct power control
- Doubly fed induction generator
- Power quality
- Unbalance grid voltage
ASJC Scopus subject areas
- Renewable Energy, Sustainability and the Environment
- Energy Engineering and Power Technology
