Abstract
To meet the augmented load power demand, the doubly-fed induction generator (DFIG) based wind electrical power conversion system (WECS) is a better alternative. Further, to enhance the power flow capability and raise security margin in the power system, the STATCOM type FACTS devices can be adopted as an external reactive power source. In this paper, a three-level STATCOM coordinates the system with its dc terminal voltage is connected to the common back-to-back converters. Hence, a lookup table-based control scheme in the outer control loops is adopted in the Rotor Side Converter (RSC) and the grid side converter (GSC) of DFIG to improve power flow transfer and better dynamic as well as transient stability. Moreover, the DC capacitor bank of the STATCOM and DFIG converters connected to a common dc point. The main objectives of the work are to improve voltage mitigation, operation of DFIG during symmetrical and asymmetrical faults, and limit surge currents. The DFIG parameters like winding currents, torque, rotor speed are examined at 50%, 80% and 100% comparing with earlier works. Further, we studied the DFIG system performance at 30%, 60%, and 80% symmetrical voltage dip. Zero-voltage fault ride through is investigated with proposed technique under symmetrical and asymmetrical LG fault for super-synchronous (1.2 p.u.) speed and sub-synchronous (0.8 p.u.) rotor speed. Finally, the DFIG system performance is studied with different phases to ground faults with and without a three-level STATCOM.
Highlights
The Doubly-Fed induction generator (DFIG) based on wind energy conversion system (WECS) is getting more critical than other class of generators [1], [2]
Various control schemes with modified outer and inner control loops for the basic field-oriented or demagnetizing control scheme are present in the literature that primarily deal with limiting the surge current in the Rotor Side Converter (RSC) windings, reactive power support, and dynamic response [10]–[15]
COMPARISON OF DFIG PROPOSED CONTROL SCHEME UNDER 80% VOLTAGE DIP WITH [27] The effectiveness of the proposed RSC, grid side converter (GSC) control scheme for DFIG system is compared with methods in [27] and [28] in two separate cases
Summary
The Doubly-Fed induction generator (DFIG) based on wind energy conversion system (WECS) is getting more critical than other class of generators [1], [2]. It is because of partial rated converters [3], extensive research-based, adaptive maximum power extraction capability [4], [5], variable rotor speed operation with desired and faster control of reactive power [6]. The direct and indirect methods studied by Mohammadi et al [8] and Baggu et al [9] discussed the DFIG behaviour because of the fault.
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