Abstract
High penetration of Doubly Fed Induction Generator (DFIG) into existing power grid can attribute complex issues as they are very sensitive to the grid faults. In addition, Fault Ride Through (FRT) is one of the main requirements of the grid code for integrating Wind Farms (WFs) into the power grid. In this work, to enhance the FRT capability of the DFIG based WFs, a Bridge-Type Flux Coupling Non-Superconducting Fault Current Limiter (BFC-NSFCL) is proposed. The effectiveness of the proposed BFC-NSFCL is evaluated through performance comparison with that of the Bridge-Type Fault Current Limiter (BFCL) and Series Dynamic Braking Resistor (SDBR). Moreover, a dynamic nonlinear controller is also proposed for controlling the operation of the BFC-NSFCL. Extensive simulations are carried out in the MATLAB/SIMULINK environment for both symmetrical and unsymmetrical temporary as well as permanent faults. Based on the simulation results and different numerical analysis, it is found that the proposed nonlinear controller based BFC-NSFCL is very effective in enhancing the FRT capability of the WF. Also, the BFC-NSFCL outperforms the conventional BFCL and SDBR by maintaining a near-seamless performance during various grid fault situations.
Highlights
Fault Ride Through (FRT) capability augmentation of Doubly Fed Induction Generator (DFIG)based wind farms is a stability concern since the stability of the entire grid depends on it [1,2].The stability requirements of every grid-connected distributed generators are defined by certain grid codes referred by the power system operators all around the world [3]
This paper presents a nonlinear controller to control the operation of the BFC-Non-Superconducting Fault Current Limiters (NSFCLs), which is another salient feature of this work
To evaluate the efficacy of the nonlinear controller based BFC-NSFCL, its performances are compared with other prominent Fault Current Limiters (FCLs) such as the Series Dynamic Braking Resistor (SDBR) [33,34] and Bridge-Type Fault Current Limiter (BFCL) [27,28]
Summary
Fault Ride Through (FRT) capability augmentation of Doubly Fed Induction Generator (DFIG). Non-Superconducting Fault Current Limiter (BFC-NSFCL) is proposed to augment the FRT capability of DFIG based wind farms. This BFC-NSFCL has less utilization of Metal Oxide Varistor (MOV), use only one Insulated Gate Bipolar Transistor (IGBT) as a bridge switch, intentionally designed to ensure less current flow through the bridge switch to minimize the power loss and use electively the Circuit Breakers (CBs) in series with the BFC-NSFCL. To evaluate the efficacy of the nonlinear controller based BFC-NSFCL, its performances are compared with other prominent FCLs such as the Series Dynamic Braking Resistor (SDBR) [33,34] and Bridge-Type Fault Current Limiter (BFCL) [27,28]
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