PMSG Based WECS with PR Control Strategy for Grid Control

Abstract:

In this paper, a current feedback control scheme is proposed using Proportional Resonant (PR) for a grid-connected converter with an LCL Filter; PR controller with harmonic compensators has high gain at the desired frequencies for decrease harmonic distortion in the alternative voltage or current. Harmonic compensators of PR controller are limited to several low-order harmonics due to the system instability when the compensated frequency is out of system control loop’s bandwidth. The average value of current flow through inductors of LCL filter is feedback to the PR current regulator. Zero D-axis Control (ZDC) is to control the generator side converter to reduce the DC-link ripples, multi-loop harmonic current controllers are applied to regulate the higher-order harmonics by PR regulators. Consequently control strategy with LCL filter is to reduce third-order function to first-order function. By this way large control loop gain can be chosen to obtain control loop for the required harmonic components of the PR controller. The simulation and experimental results have been illustrated to validate the effectiveness of the proposed method in MATLAB Simulink.

• Periodical: Applied Mechanics and Materials (Volume 573)
• Pages: 267-272
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.573.267
• Online since: June 2014
• Authors: V. Prasath*, S. Vijayalakshmi, R. Jain Anush
• Keywords: LCL Filter, PR Controller, Wind Turbine Designing, ZDC Controller

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