Passivity-based control system for stand-alone hybrid electrogenerating complex
DOI:
https://doi.org/10.15276/aait.02.2021.2Keywords:
Energy Generating Complex, Photovoltaics, Wind Power Plant, Hybrid Battery-Supercapacitor Energy Storage System, Passivity-Based Control (PBC), Port-Controlled Hamiltonian System (PCH), Synthesis by Interconnections and Damping Assignment (IDA)Abstract
The desire for energy independence presupposes the use of various types of elements for energy generation from renewable
sources, for the stand-alone operation of which energy storage devices are required. A power generation complex created in this way
must perform a number of tasks that are formed by the energy management system. The control system performs these tasks and
ensures proper static and dynamic characteristics of this complex with many inputs and outputs. The results of recent world
researches, as well as the authors experience of this work, show that, for creating such control systems, it is advisable to use Passive-
Based Control (PBC), presenting the control object as a Port-Controlled Hamiltonian (PCH) system. Thanks to the developed method
of additional interconnections and damping injection (Interconnection & Damping Assignment - IDA) passive control provides
ample opportunities to adjust the control effects, while ensuring the asymptotic stability of the system as a whole. This is particularly
useful in the complex system considered in this paper that includes both a hybrid power plant for electricity generation from the sun
and wind and a hybrid energy storage unit consisting of the battery and supercapacitor module. This article shows the procedure of
PBC system synthesis, according to which three structures of control influence formers (CIF) were designed and investigated. These
structures have different combinations of additional interconnections and damping, which allows forming the desired energy flows
inside the closed-loop system and therefore provide desired control results. Among them, there are tasks of maintaining voltages on
the DC bus and the supercapacitor module at reference levels, and the smoothness of the battery current transients. A comparative
simulation studies were performed on a computer model of the power generation complex with synthesized control systems, which
was created in the MATLAB/Simulink environment. It showed the efficiency of their work and the advantages of different CIF
structures.
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