Abstract

This paper primarily focuses on an advance control strategy to enhance the low voltage ride through (LVRT) capability in doubly fed induction generator (DFIG) based wind energy conversion system (WCES). In the proposed control strategy, the captured wind energy during grid faults circumstances is stored timidly in the rotor’s inertia kinetic energy. Though a minimal amount of energy is available in the grid, stator current and DC-link voltage are set beneath the perilous levels. However, both the required stator voltage and stator current are kept within a tolerable range of rotor side converter (RSC), through state feedback linearization technique for maintaining the accurate control to suppress the overvoltage and overcurrent. Furthermore, stator current oscillations are significantly suppressed during fault transient. The input mechanical energy from the wind turbine can be resumed after the fault clearance. In spite of being dissipated in the resistors of crowbar circuit, as in the conventional LVRT assemblies, torque balancing among electrical and mechanical measures is attained; DC-link voltage instabilities and rotor speed inconsistencies are substantially reduced. As a result, a noticeable reduction in the requirement of reactive power and swift restoration of terminal voltage on fault clearance is acquired successfully. Correspondingly, several tests are conducted to validate the effectiveness and enhancement in the performance of the DFIG based wind farms, when the proposed control strategy is implemented over it during numerous fault ride-through circumstances.

Highlights

  • Wind energy has been significantly exploited across the globe over the past two decades.The innovation and development in the field of renewable energy sources have been introduced for sustainable, efficient and clean energy

  • The behavior of short-circuit current in a doubly fed induction generator (DFIG) connected wind energy system can be constricted according to the power converter rating

  • state feedback control (SFC) affects the magnitude of fault current significantly; once again it is confirmed that such designed to control the stator current, since rotor side converter (RSC) of DFIG is employed to adjust the parameters of the controller

Read more

Summary

Introduction

Wind energy has been significantly exploited across the globe over the past two decades. The behavior of short-circuit current in a DFIG connected wind energy system can be constricted according to the power converter rating. In [32], a technique was proposed to handle voltage source converter (VSC) connected with a wind energy system by regulating the virtual inner electrical potential and angular velocity of brushless DFIG by controlling the winding current oriented vector control. This technique leads to compensate the transient control winding current to weaken the transient inner electrical potential under symmetrical grid faults.

Dynamic Modeling of DFIG
Grid-Side Converterand Filter Model
Conventional PI Controller Design
Mathematical Modeling of of Scheme
Crowbar Protection
Simulations Results
Conclusions
Full Text
Published version (Free)

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call