Distributed Predictive Secondary Control for Imbalance Sharing in AC Microgrids

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Abstract
This paper proposes a distributed predictive secondary control strategy to share imbalance in three-phase, three-wire isolated AC Microgrids. The control is based on a novel approach where the imbalance sharing among distributed generators is controlled through the control of single-phase reactive power. The main characteristic of the proposed methodology is the inclusion of an objective function and dynamic models as constraints in the formulation. The controller relies on local measurements and information from neighboring distributed generators, and it performs the desired control action based on a constrained cost function minimization. The proposed distributed model predictive control scheme has several advantages over solutions based on virtual impedance loops or based on the inclusion of extra power converters for managing single-phase reactive power among distributed generators. In fact, with the proposed technique the sharing of imbalance is performed directly in terms of single-phase reactive power and without the need for adding extra power converters into the microgrid. Contrary to almost all reported works in this area, the proposed approach enables the control of various microgrid parameters within predefined bands, providing a more flexible control system. Extensive simulation and Hardware in the Loop studies verify the performance of the proposed control scheme. Moreover, the controller’s scalability and a comparison study, in terms of performance, with the virtual impedance approach were carried out.
Funding Information
  • “Agencia Nacional Investigacion y Desarrollo” (ANID) under Project (11200121, 1210208)
  • Instituto Sistemas Complejos de Ingeniería (ANID PIA/BASAL AFB180003, ANID Basal FB0008, ANID PIA ACT192013, ANID/FONDAP/15110019)
  • ANID BECAS/DOCTORADO NACIONAL (2016-21160931)
  • ANID BECAS/DOCTORADO NACIONAL (2019-21190961)
  • Secretaría de Educación Superior, Ciencia, Tecnología e Innovación de Ecuador (SENESCYT/ARSEQ-BEC-0058482018)

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