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%.
|Commitee:||Ary, James, Shahian, Bahram|
|School:||California State University, Long Beach|
|School Location:||United States -- California|
|Source:||MAI 55/03M(E), Masters Abstracts International|
|Keywords:||Grid voltage distortion|
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