A mixed Hinfty-Passivity approach for Leveraging District Heating Systems as Frequency Ancillary Service in Electric Power Systems

TL;DR

This paper proposes a novel mixed H-infinity-passivity control framework for district heating systems with heat pumps to enhance frequency regulation in power grids, ensuring stability and robustness.

Contribution

It introduces a new control approach combining H-infinity and passivity concepts for DHSs, with LMI-based controller design and disturbance-independent regulation.

Findings

Improved frequency regulation in power systems.

Maintained thermal performance and robustness.

Validated through simulations.

Abstract

This paper introduces a mixed H-infinity-passivity framework that enables district heating systems (DHSs) with heat pumps to support electric-grid frequency regulation. The analysis illustrates how the DHS regulator influences coupled electro-thermal frequency dynamics and provides LMI conditions for efficient controller design. We also present a disturbance-independent temperature regulator that ensures stability and robustness against heat-demand uncertainty. Simulations demonstrate improved frequency-control dynamics in the electrical power grid while maintaining good thermal performance in the DHS.