Dissertation/Thesis Abstract

Controlling of nonlinear loads and grid voltage distortion in distributed generation using current compensator
by Adla, Maneesh Kumar Reddy, M.S., California State University, Long Beach, 2016, 51; 1606707
Abstract (Summary)

In distributed power generation, there is a strong presence of undesirable harmonics due to converter switching and non- linear loads. The highly distorted current cannot be fed directly to the utility grid as it will imbalance the operations of the whole power system. This project presents an enhanced current control technique for Distributed Generation (DG) which transfers a pure sinusoidal current into the grid despite the nonlinear local load and distorted grid voltage conditions. The proposed controller is composed of a Repetitive Controller (RC) and a Proportional plus Integral (PI) controller designed in a coordinated manner. This controller provides a waveform of better quality than a simple PI controller under both unbalanced and balanced conditions. By using a simple delay function, an RC can compensate for a large number of harmonic components, with the grid current quality significantly improved as compared to other traditional control methods with a simple PI controller. Simulation results validate the improved performance of the proposed controller. By using the proposed controller, the total harmonic distortion is reduced from 11% to 2%.

Indexing (document details)
Advisor: Chassiakos, Anastasios
Commitee: Ary, James, Shahian, Bahram
School: California State University, Long Beach
Department: Electrical Engineering
School Location: United States -- California
Source: MAI 55/03M(E), Masters Abstracts International
Subjects: Electrical engineering
Keywords: Grid voltage distortion
Publication Number: 1606707
ISBN: 9781339397740
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