|Comparison of Three Stability Analysis Methods for Delayed Cyber-Physical Power System|
【Title】Comparison of Three Stability Analysis Methods for Delayed Cyber-Physical Power System
【Abstract】The power system with wide-area damping controllers (WADC) embedded is essentially complex delayed cyber-physical power system (DCPPS) since time delays are introduced during transmitting and processing wide-area measurements. In this paper, three methods for stability analysis of DCPPS, i.e., de- lay-dependent stability criterion in the time domain, Padé approximation-based method as well as explicit infinitesimal generator discretization-based method (EIGD) in the frequency domain are extensively com- pared from both theoretical and numerical analysis in terms of conservativeness, accuracy, scalability and the capability of handling multiple delays. Simulation re- sults reveals that: (1) The conservativeness in delay margin derived by delay-dependent stability criterion reaches to 7.09% for the two-area four-machine test system. (2) Padé approximation-based eigen-analysis method is sufficiently accurate even a low order of the approximation, e.g., 3 rd order, is used. (3) Padé ap- proximation-based eigen-analysis method is more effi- cient than EIGD for small stability analysis of large DCPPS.
【Keywords】time delay; linear matrix inequality; Padé approximation; spectral discretization; infinites- imal generator discretization; eigen-analysis【Author】
|Weikang Gao||: Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University),250061, Ji？nan, China|
|Hua Ye||: Shandong Electric Power Dispatch and Control Center, 250001, Ji？nan, China|
【出版时间】Tue Aug 09 08:00:00 CST 2016
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