Fast response NLC controller for high gain QRC in wind connected DCMG with reduced steady-state error

Abstract

ABSTRACT This paper proposes a system with Non-linear Carrier (NLC) controller for a high-voltage gain Quadrupler Converter (QRC). The system is 400 V DC Micro Grid (DCMG) with Wind Energy Conversion System (WECS). The quadrupler converter is a non-isolated topology that achieves single-stage high voltage gain with a low duty ratio and reduced voltage stress of semiconductor devices. The proposed system assures robust dynamics against changing operating conditions, variations in circuit parameters, and external load conditions. The parameters, such as voltage gain, voltage ripple, current ripple, delay time, settling time and peak overshoot, are assessed to ensure the agility of the proposed system. The performance of the proposed system is analysed with various wind speeds using Matlab Simulink-based simulation studies. The results inferred that the proposed method provides a fast response for various input and load variations and high gain at low duty ratio. A 200 W wind-connected QRC system with an NLC controller prototype is developed to validate the simulation results.