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Quadratic regulator based optimal state feedback controller for stability improvement of inverter based microgrids
A. Firdaus, S. Mishra,
Published in Institute of Electrical and Electronics Engineers Inc.
Volume: 2017-December
Pages: 2165 - 2170
Small signal stability of inverter based droop controlled microgrid is a major problem from past decade. In this work, an optimal state feedback controller is designed to improve the stability of the two inverter based test microgrid. The detailed full order small signal model of the test microgrid is developed in state space considering network and load dynamics. Eigen value and sensitivity analysis is done to find out the states which affects the stability of the system and their respective participation in shaping the critical modes of the microgrid. Linear quadratic regulator (LQR) based an optimal controller is then implemented into the single inverter model which provides a state feedback to the open loop system to enhance stability. Eigen value analysis is done using MATLAB to prove that the designed controller improves the dynamic response of the individual inverter by providing sufficient damping to the oscillatory modes. Hence it increases the overall stability of the microgrid. © 2017 IEEE.
About the journal
JournalData powered by TypesetIEEE Region 10 Annual International Conference, Proceedings/TENCON
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.