A Modified Double-Integral-Sliding-Mode-Controller for a Microgrid System With Uncertainty
DOI:
https://doi.org/10.13052/dgaej2156-3306.3512Keywords:
Three-phase microgrid, photovoltaic system, DISMC, H∞ con- troller, parametric uncertainties.Abstract
Recently infiltration of large scale of microgrid systems into the power grid is
recorded. Among these systems, photovoltaic (PV) based microgrid systems
are more in demand due to its renewable, pollution free properties and
abundantly available fuel. Grid integration of this microgrid system again
enhanced its energy efficiency. But, dynamics of this PV based microgrid
system is highly nonlinear and uncertain in nature. It suffers from para-
metric uncertainties. This kind of system can’t be controlled properly by
conventional linear controllers. Sliding mode controller (SMC) is capable
of controlling this kind of system with ease. However, SMC suffers from its
inherent chattering introduction in the system output waveform. To reduce the
chattering from the output waveform, there is requirement of some modifica-
tion in the existing SMC structure dynamics. This paper presents an extended
state observer based double integral sliding mode controller (DISMC) for this
studied system. By using DISMC, the chattering magnitude is diminished
greatly. Parameter uncertainties of the system lead to some unknown control
states. These unknown states are identified by the state observer. Therefore,
the proposed controller is more efficient in reference tracking, disturbance rejection and robust stability. To test the efficacies of the proposed controller,
results of the studied system with this controller are compared with that of
H∞ controller.
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