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Design and Evaluation of a Model-Free Frequency Control Strategy in Islanded Microgrids with Power-Hardware-in-the-Loop Testi...

by Maximiliano F Ferrari Maglia, Byungkwon Park, Mohammed M Olama
Publication Type
Conference Paper
Journal Name
North American Power Symposium
Book Title
2021 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT)
Publication Date
Publisher Location
United States of America
Conference Name
Innovative Smart Grid Technologies Conference (ISGT)
Conference Location
Washington, District of Columbia, United States of America
Conference Sponsor
Conference Date

The deterioration of inertial and primary frequency response of islanded microgrids has been a crucial issue for the proper operation of such microgrids. Several approaches, including inertia emulation strategies, have been proposed to improve the primary frequency response. However, the demonstrations of most inertia emulation research works are based on simulation-only testing which hinder their applicability in the field. In this paper, a novel model-free control (MFC) strategy for frequency response support in a diesel-wind microgrid system is presented, and it is tested for evaluation using a power-hardware-in-the-Ioop (PHIL) platform. The PHIL testing is one step closer to field testing since it allows real-time verification and accounts for the nonlinear grid dynamics, noise, and time delays that are usually ignored in simulation-only environments. The proposed MFC strategy is fully distributed, has low computational requirements, and can be easily implemented in resource constrained devices such as smart inverters. A PHIL microgrid platform consisting of two type-3 wind turbine generators and one diesel generator is used to test the proposed MFC strategy.