Abstract
An improved grid voltage control strategy of doubly-fed induction generators (DFIG) wind farm in distribution networks is proposed based on the DFIG operation characteristic. The voltage control method through reactive power and negative sequence voltage compensation method are included. Based on the power relationships of DFIG system, a modified reactive power limit calculation method in different operation states of DFIG is analyzed and the reactive power control strategies of wind farm and DFIG are introduced. The negative sequence voltage compensation control strategy of DFIG is proposed for unbalanced grid voltage condition. The compensation limit is given based on the current margins and DC voltage limitation of grid side converter. The distribution algorithms of negative sequence current in the wind farm and in the generator system are also introduced. The proposed grid voltage control strategy is verified by simulation results. Simulation results show that with the grid voltage control method, the stability of the wind farm and power grid is improved.
| Original language | English |
|---|---|
| Pages (from-to) | 29-35 |
| Number of pages | 7 |
| Journal | Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering |
| Volume | 30 |
| Issue number | 7 |
| State | Published - 5 Mar 2010 |
| Externally published | Yes |
Keywords
- Distribution networks
- Doubly fed induction generator wind farm (DFIG)
- Grid voltage control
- Negative sequence voltage compensation
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