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Microgrid System Control Identification and Evaluation for Enhanced Dynamic Operation

A.H.M.A. Rahim

Abstract


Networking the distributed generators (DG) in a microgrid system involves a large number of electronic components and filters. Small changes or drifts in operating conditions as well as disturbances at the point of common coupling can excite the associated eigenvalues giving rise to slowly growing instability in the system. This article considers the stability of a microgrid system consisting of a micro alternator, wind generator, photovoltaic (PV) system, fuel cell (FC) system, and an energy storage device supplying an aggregated load. The hierarchy of the various signals available in the system in terms of damping enhancement has been identified through Hankel singular values as well as residue analysis. The signals included are the voltage magnitude and phase angle of the various DG units including those of STATCOM storage device. Both the frequency response based methods indicate that the phase angle of the STATCOM voltage contains maximum damping contents, followed by the fuel cell and PV converter voltage angles.  Simulation studies were carried out comparing the performance of the STATCOM voltage phase angle signal with that from the FC system. Also, a comparison was made between the STATCOM voltage magnitude and phase angle signals. It was observed that the STATCOM voltage phase angle control provides very good transient control following perturbations in the microgrid system.

Keywords: Microgrid control, renewable energy, non-autonomous microgrid, HSV

Cite this Article

Rahim A.H.M.A. Microgrid System Control Identification and Evaluation for Enhanced Dynamic Operation. Journal of Control & Instrumentation. 2018; 9(1): 33–44p.



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