Derisking of subsynchronous torsional oscillations in power systems with conventional and inverter-based generation

TL;DR

This paper presents a detailed methodology for mitigating subsynchronous torsional oscillations in power systems, using a real-world case with both conventional and inverter-based generation, emphasizing practical application and minimal data requirements.

Contribution

It introduces a comprehensive derisking approach for subsynchronous oscillations, including detailed steps, controller design, and resource considerations, demonstrated on a realistic power plant model.

Findings

Effective damping of unstable oscillations achieved

Methodology applicable to real-world power systems

Minimal data requirements for implementation

Abstract

This article proposes an application of a derisking methodology of subsynchronous torsional oscillations considering a realistic use case. The main objective is to summarize and draft a synthetic paper clarifying the complete methodology highlighting the main information needed step-by-step. For exemplification, a real model from a decommissioned oil power plant is adopted, where a fictitious high voltage direct current power link is connected. In this article, stress is laid on details of the application of the derisking methods: the unit interaction factor and the complex torque coefficients method. Then, the different steps to obtain results are explicitly explained. Moreover, the design and tuning process of supplementary subsynchronous damping controller is discussed. This mitigation section uses minimal information to correctly damp the unstable oscillations, as one would expect from industrial projects where the data sharing may be limited. Finally, the resources needed to perform each step of the study were summarized.