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Energies 2012, 5(11), 4758-4778; doi:10.3390/en5114758
Article

Proportional-Resonant Control of Doubly-Fed Induction Generator Wind Turbines for Low-Voltage Ride-Through Enhancement

1,* , 2
, 1
 and 1,3
1 School of Electrical Engineering and Automation, Tianjin University, Tianjin 300072, China 2 College of Physics & Electronic Engineering, Henan Normal University, Xinxiang 453007, China 3 School of Electrical Engineering & Automation, Tianjin Polytechnic University, Tianjin 300160, China
* Author to whom correspondence should be addressed.
Received: 6 September 2012 / Revised: 5 November 2012 / Accepted: 5 November 2012 / Published: 19 November 2012
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Abstract

A novel control strategy is proposed in this paper for the rotor side converter (RSC) of doubly-fed induction generator (DFIG)-based wind power generation systems. It is supposed to enhance the low-voltage ride-through (LVRT) capability of DFIGs during great-level grid voltage dips. The strategy consists of a proportional-resonant (PR) controller and auxiliary PR controllers. The auxiliary controllers compensate the output voltage of the RSC in case of grid faults, thus limiting the rotor inrush current of DFIG and meeting the requirements of LVRT. Sequential-component decompositions of current are not required in the control system to improve the response of system. Since the resonant compensator is a double-side integrator, the auxiliary controllers can be simplified through coordinate transformation. The feasibility of the control strategy is validated by simulation on a 1.5 MW wind-turbine driven DFIG system. The impact of the RSC converter voltage rating on the LVRT capability of DFIG is investigated. Meanwhile, the influence of angular frequency detection and control parameters are also discussed. Compared with traditional vector control schemes based on PI current controllers, the presented control strategy effectively suppress rotor current and reduce oscillations of DFIG power and torque under grid faults.
Keywords: doubly-fed induction generator (DFIG); grid faults; low-voltage ride-through (LVRT); proportional-resonant (PR) controller doubly-fed induction generator (DFIG); grid faults; low-voltage ride-through (LVRT); proportional-resonant (PR) controller
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Yan, Y.; Wang, M.; Song, Z.-F.; Xia, C.-L. Proportional-Resonant Control of Doubly-Fed Induction Generator Wind Turbines for Low-Voltage Ride-Through Enhancement. Energies 2012, 5, 4758-4778.

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