TITLE:
Wide-Area Delay-Dependent Adaptive Supervisory Control of Multi-machine Power System Based on Improve Free Weighting Matrix Approach
AUTHORS:
Ziyong Zhang, Zhijian Hu, Yukai Liu, Yang Gao, He Wang, Jianglei Suo
KEYWORDS:
Adaptive Supervisory Controller (ASC); Delay-dependent Damping Control; Power Oscillation; IFWM; LMI; Free Weighting Matrix Approach; Time-varying Delay; WAMS
JOURNAL NAME:
Energy and Power Engineering,
Vol.5 No.4B,
October
22,
2013
ABSTRACT: The paper demonstrates the possibility to enhance the
damping of inter-area oscillations using Wide Area Measurement (WAM) based adaptive
supervisory controller (ASC) which considers the wide-area signal transmission
delays. The paper uses an LMI-based iterative nonlinear optimization algorithm
to establish a method of designing state-feedback controllers for power systems
with a time-varying delay. This method is based on the delay-dependent
stabilization conditions obtained by the improved free weighting matrix (IFWM)
approach. In the stabilization conditions, the upper bound of feedback signal’s
transmission delays is taken into consideration. Combining theoriesof state
feedback control and state observer, the ASC is designed and time-delay output
feedback robust controller is realized for power system. The ASC uses the input
information from Phase Measurement Units (PMUs) in the system and dispatches
supplementary control signals to the available local controllers. The design of
the ASC is explained in detail and its performance validated by time domain
simulations on a New England test power system (NETPS).