Fault ride through enhancement capability and improved control strategies of DFIG based wind energy conversion systems

Abstract

Across many countries, the Wind Turbines Generation Systems (WTGS) newlinehave been installed over the past few years. Due to the meteorological changes there newlinewill be continuous changes in wind breeze so the power generated by the wind newlineturbine is inconsistent. Hence there will be a fluctuation in power generation and newlinelosses also happen. Due to this problem, the wind turbine will not deliver constant newlinepower to the grid so this research introduces the different methodology for newlinedelivering constant and maximum power to the grid. By suggesting Doubly Fed newlineInduction Generator (DFIG) system for generating power while the wind turbine newlineoperates at below fixed speed. But Doubly-Fed Induction Generator is oversensitive newlineto grid faults, which makes to fail the Bidirectional converters and dc link capacitor newlinedue to high inrush current and over voltage. Hence protection techniques are newlinerequired to prevent Doubly-Fed Induction Generator from grid fault. In order to newlinemaintain the contact with grid during voltage dip, Low Voltage Ride Through newline(LVRT) is an essential phenomenon. The above said problem is rectified by using newlineeight protection techniques to prevent doubly-Fed Induction Generator during newlinevoltage dip are implemented. These eight methods are Blade pitch angle control, DC newlineChopper, crowbar circuit, Battery energy storage system, series dynamic resistance, newlineswitch-type fault current limiter, Dynamic Voltage Restorer and FACTS Devices. newlineThese methods are studied and analyzed in this paper. newlineEnhancement of LVRT method is carried by combining the Switch type fault newlinecurrent Limiter and Super Capacitor for Doubly-Fed Induction Generator based newlinewind turbines are analyzed and experiment conducted using MATLAB software. newlineLVRT method of Doubly-Fed Induction Generator based Wind Energy Conversion newlineSystem is Implemented by STFCL-SMES, the experiment conducted using newlineMATLAB software in which grid current, voltage, real power and reactive power newlineare controlled using STFCL and SMES model.