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The need for higher degree of infrastructure utilization of the electric power system inevitably results in its operation closer to the limits. This in turn places the burden on control and protection strategies to ensure the constraints are not violated. This is especially imperative in microgrids in which resources are more limited and constraints are tighter. This paper presents an adaptive control strategy to augment the existing controllers and enhance their performance. This strategy monitors the response of a controlled device and temporarily modulates its control set point to achieve close tracking of the set point in the presence of disturbances. A detailed analytical derivation for the case that the overall behavior of the system (the devices and its controller) is approximated with a second-order transfer function is presented to confirm the viability of this strategy and its ability in designing a response with limited over- or undershoot.
Date of Publication: Nov. 2012