Locating the Sources of Sub-synchronous Oscillations Induced by the Control of Voltage Source Converters Based on Energy Structure and Nonlinearity Detection

TL;DR

This paper introduces a novel scheme combining energy structure analysis and nonlinearity detection to accurately locate the sources of sub-synchronous oscillations caused by voltage source converter control, validated through simulation.

Contribution

It proposes a new method that integrates energy flow analysis and nonlinearity detection for precise oscillation source localization in VSCs.

Findings

The scheme effectively narrows down oscillation sources.

It distinguishes contributions of different VSCs.

Simulation results validate the approach.

Abstract

The oscillation phenomena associated with the control of voltage source converters (VSCs) are widely concerning, and locating the source of these oscillations is crucial to suppressing them; therefore, this paper presents a locating scheme, based on the energy structure and nonlinearity detection. On the one hand, the energy structure, which conforms with the principle of the energy-based method and dissipativity theory, is constructed to describe the transient energy flow for VSCs, and on this basis, a defined characteristic quantity is implemented to narrow the scope of oscillation source location; on the other hand, according to the self-sustained oscillation characteristics of VSCs, an index for nonlinearity detection is applied to locate the VSCs which produce the oscillation energy. The combination of the energy structure and nonlinearity detection could distinguish the contributions of different VSCs to the oscillation. The results of a case study implemented by the PSCAD/EMTDC simulation validate the proposed scheme.