Achieving Economic Operation and Secondary Frequency Regulation Simultaneously Through Feedback Control
For power system operators, this provides a method to unify frequency regulation and economic dispatch, potentially simplifying control design.
The paper shows that secondary frequency control parameters can be tuned to achieve both economic operation and frequency regulation simultaneously, by establishing equivalence between iterative economic dispatch methods and integral/proportional-integral control.
This article presents an exciting finding for the power industry: the parameters of secondary frequency control based on integral or proportional integral control can be tuned to achieve economic operation and frequency regulation simultaneously. We show that if the power imbalance is represented by frequency deviation, an iterative dual decomposition based economic dispatch solving is equivalent to integral control. An iterative method of multipliers based economic dispatch is equivalent to proportional integral control. Similarly, if the controller parameters of the secondary frequency controls are chosen based on generator cost functions, these secondary frequency controllers achieve both economic operation and frequency regulation simultaneously.