Optimal design of linear subsynchronous damping controllers for stabilising torsional interactions under all possible operating conditions

Huakun Liu, Xiaorong Xie*, Liang Wang, Yingduo Han

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Torsional damping controllers, such as supplementary excitation damping controllers (SEDCs), are widely used to stabilise subsynchronous resonance (SSR) induced by torsional interactions (TIs) between turbo-generators and series-compensated power systems. However, because of the changeable operating situations of a power system, it is a great challenge to design them to guarantee torsional stability under all possible operating conditions. This study proposes a global optimal control-design procedure for tuning SEDCs to accommodate the variation of system conditions. Considering TI is a small-signal stability issue, the non-linear power system is converted into a family of linear parameter varying models and the parameter-tuning task for multiple SEDCs is formulated into a multi-model constrained non-linear optimisation problem. A global optimisation procedure based on genetic algorithm and simulated annealing is designed to efficiently solve this problem and obtain a set of robust or several sets of gain-scheduling SEDCs. The proposed method is applied to a multi-machine series-compensated power system. The results of both eigenvalue analysis and time-domain simulation have fully demonstrated the effectiveness of the optimised SEDCs in stabilising SSR under all possible operating conditions.

Original languageEnglish
Pages (from-to)1652-1661
Number of pages10
JournalIET Generation, Transmission and Distribution
Volume9
Issue number13
DOIs
Publication statusPublished - 1 Oct 2015
Externally publishedYes

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Liu, H., Xie, X., Wang, L., & Han, Y. (2015). Optimal design of linear subsynchronous damping controllers for stabilising torsional interactions under all possible operating conditions. IET Generation, Transmission and Distribution, 9(13), 1652-1661. https://doi.org/10.1049/iet-gtd.2014.0824