Dynamically robust coordinated set point tracking of distributed DERs at point of common coupling

Syed, Mazheruddin and Mehrizi-Sani, Ali and Robowska, Maria and Guillo-Sansano, Efren and Wang, Dong and Burt, Graeme (2022) Dynamically robust coordinated set point tracking of distributed DERs at point of common coupling. International Journal of Electrical Power & Energy Systems, 143. 108481. ISSN 0142-0615 (https://doi.org/10.1016/j.ijepes.2022.108481)

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Low-inertia operation of small-scale power systems, such as a microgrid or a portion of a long feeder, requires careful coordination of the controller performance of the constituting devices. This challenge is exacerbated in microgrids serving the functionalities of a conventional synchronous-based generation unit while comprised of smaller DERs operating mainly interfaced through power electronics converters. This paper builds on the idea of set point modulation and proposes a two-level control strategy that aims to achieve superior performance at the point of common coupling (PCC) of microgrids by combining a local control level with a distributed and coordinated level. Several case studies on both AC and DC systems, the CIGRE low-voltage benchmark system as the AC system and a test DC microgrid, validate the performance of the proposed approach. The real-world applicability of the approach is established via a high-fidelity power hardware-in-the-loop (PHIL) experimental setup and an application case study on grid frequency regulation. The proposed approach enables a microgrid to participate in ancillary service provisions where speed and quality of regulation are critical.