Robust multi-objective control of hybrid renewable microgeneration systems with energy storage

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Abstract

Microgeneration technologies are positioned to address future building energy efficiency requirements and facilitate the integration of renewables into buildings to ensure a sustainable, energy-secure future. This paper explores the development of a robust multi-input multi-output (MIMO) controller applicable to the control of hybrid renewable microgeneration systems with the objective of minimising the electrical grid utilisation of a building while fulfilling the thermal demands. The controller employs the inverse dynamics of the building, servicing systems, and energy storage with a robust control methodology. These inverse dynamics provides the control system with knowledge of the complex cause and effect relationships between the system, the controlled inputs, and the external disturbances, while an outer-loop control ensures robust, stable control in the presence of modelling deficiencies/uncertainty and unknown disturbances. Variable structure control compensates for the physical limitations of the systems whereby the control strategy employed switches depending on the current utilisation and availability of the energy supplies. Preliminary results presented for a system consisting of a micro-CHP unit, solar PV, and battery storage indicate that the control strategy is effective in minimising the interaction with the local electrical network and maximising the utilisation of the available renewable energy.
Original languageEnglish
Pages (from-to)1498-1506
Number of pages9
JournalApplied Thermal Engineering
Volume114
Early online date14 Sep 2016
DOIs
Publication statusE-pub ahead of print - 14 Sep 2016

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Keywords

  • microgeneration
  • multi-objective control
  • hybrid renewable energy systems
  • Simulation
  • feedback linearization
  • robust control

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