Achieving Economic Operation and Secondary Frequency Regulation Simultaneously Through Feedback Control

TL;DR

This paper demonstrates that by tuning secondary frequency control parameters based on generator costs, power systems can achieve both economic operation and frequency regulation simultaneously, using control methods equivalent to economic dispatch algorithms.

Contribution

It introduces a novel approach linking secondary frequency control parameters with economic dispatch, enabling simultaneous economic and frequency regulation in power systems.

Findings

Integral control is equivalent to iterative dual decomposition economic dispatch.

Proportional integral control aligns with an iterative multipliers economic dispatch.

Proper parameter tuning based on generator costs achieves dual objectives.

Abstract

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.