A supervisory hybrid control design approach is proposed for the
operation and control of a wind energy conversion and battery
storage system during grid-connected and in islanded operation. A
finite hybrid-automata based modeling paradigm for the system is
presented. The proposed model defines the allowable operating
states and inter-state transition paths managed by the supervisory
control layer. The subject system has been partitioned into three
independent system modules using a modular control design approach.
The supervisory control layer combines and configures control
schemes of the constituent modules to suite the requirements of
operation during any one operating state of the system. Transition
management strategies implemented through the supervisory control
layer ensure smooth inter-state transitions and bumpless switching
among regulators. Detailed mathematical models of the system are
provided in each operating state. Frequency domain linear analysis
and time domain electromagnetic transient simulations are presented
for the microgrid system under steady state and dynamic operating
conditions including temporary faults on the utility grid.
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