| Title |
Hierarchical Voltage Regulation of a DFIG-based Wind Power Plant Using a Reactive Current Injection Loop with the Maximum Voltage Dip for a Grid Fault |
| Authors |
박건(Park, Geon) ; 김진호(Kim, Jinho) ; 강용철(Kang, Yong Cheol) |
| DOI |
https://doi.org/10.5370/KIEE.2016.65.8.1334 |
| Keywords |
DFIG ; Hierarchical voltage regulation of a WPP ; Maximum voltage dip ; Reactive current injection loop |
| Abstract |
In a power grid that has a high wind power penetration, the fast voltage support of a wind power plant (WPP) during the grid fault is required to stabilize the grid voltage. This paper proposes a voltage control scheme of a doubly-fed induction generator (DFIG)-based WPP that can promptly support the voltage of the point of common coupling (PCC) of a WPP during the grid fault. In the proposed scheme, the WPP and DFIG controllers operate in a voltage control mode. The DFIG controller employs two control loops: a maximum voltage dip-dependent reactive current injection loop and a reactive power to voltage loop. The former injects the reactive power in proportion to the maximum voltage dip; the latter injects the reactive power in proportion to the available reactive power capability of a DFIG. The former improves the performance of the conventional voltage control scheme, which uses the latter only, by increasing the reactive power as a function of the maximum voltage dip. The performance of the proposed scheme was investigated for a 100-MW WPP consisting of 20 units of a 5-MW DFIG under various grid fault scenarios using an EMTP-RV simulator. The simulation results indicate that the proposed scheme promptly supports the PCC voltage during the fault under various fault conditions by increasing the reactive current with the maximum voltage dip. |