TY - JOUR
T1 - Optimal design of linear subsynchronous damping controllers for stabilising torsional interactions under all possible operating conditions
AU - Liu, Huakun
AU - Xie, Xiaorong
AU - Wang, Liang
AU - Han, Yingduo
N1 - Publisher Copyright:
© The Institution of Engineering and Technology.
PY - 2015/10/1
Y1 - 2015/10/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84942321674&partnerID=8YFLogxK
U2 - 10.1049/iet-gtd.2014.0824
DO - 10.1049/iet-gtd.2014.0824
M3 - Article
AN - SCOPUS:84942321674
SN - 1751-8687
VL - 9
SP - 1652
EP - 1661
JO - IET Generation, Transmission and Distribution
JF - IET Generation, Transmission and Distribution
IS - 13
ER -