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Low Voltage Ride-Through Protection Techniques for DFIG Wind Generator

   Dhirendra, Imran Khan

Abstract

This paper we require Low-Voltage Ride-Through (LVRT) capability for wind turbines so they can remain online and support the electric grid post fault events instead of instantaneous tripping. This is one of the biggest challenges facing massive deployment of wind farms. With increasing penetration of wind turbines in the grid, the grid connection codes in most countries require that they should remain connected to maintain reliability during and after a short-term fault. This results in low-voltage ride-through with only 15% remaining voltage at the point of common coupling, possibly even less. In addition, it is also required for wind turbines to contribute to the system stability during and the after fault clearance. To fulfill the low-voltage ride through requirement for doubly-fed induction generator-based wind turbines, there are two problems to be addressed, namely, rotor inrush current that may exceed the converter limit and the DC-link overvoltage. The Doubly Fed Induction Generator (DFIG) is the most popular type among the leading wind turbine (WT) manufacturers. The DFIG has the advantages of; low cost, low weight, and high efficiency, and one of its main disadvantages is its sensitivity to the voltage dips. In this paper two LVRT methods for protection of DFIG during LV events are implemented and compared. The two methods are Crowbar, These methods were tested under different types of fault including symmetrical and unsymmetrical faults and their performances were compared. Various protection techniques of the DFIG were discussed and simulated under different conditions using the Matlab/Simulink.


Keywords

DFIG, LVRT, Crowbar, DC Chopper, SDR


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