Maintaining stability with distributed generation in a restructured industry

A set of reduced order, linearized, dynamic models for distributed generators is developed along with a framework for modeling the generators in a power distribution system. Analysis of this distributed system structure raises two issues. The first is that the simulations demonstrate, unexpectedly, that a small load disturbance is capable of causing frequency instability in the primary dynamics of the distributed generators. Eigenanalysis of the instability suggests that it is a system phenomenon. The second issue is that the system matrix is found to not have a block diagonal dominant structure raising questions over the possible implementation of decentralized control strategies. A method to regain system stability along with an example of implementing this method are presented, along with the generator models.

[1]  J. Zaborszky,et al.  Block diagonal dominance for systems of nonlinear equations with application to load flow calculations in power systems , 1984 .

[2]  L. N. Hannett,et al.  A governor/turbine model for a twin-shaft combustion turbine , 1995 .

[3]  Marija Ilic,et al.  The Control and Operation of Distributed Generation in a Competitive Electric Market , 1998 .

[4]  Ieee Report,et al.  Dynamic Models for Steam and Hydro Turbines in Power System Studies , 1973 .

[5]  L. N. Hannett,et al.  Field tests to validate hydro turbine-governor model structure and parameters , 1994 .

[6]  W. I. Rowen,et al.  Simplified Mathematical Representations of Heavy-Duty Gas Turbines , 1983 .

[7]  P. Kundur,et al.  DYNAMIC MODELS FOR FOSSIL FUELED STEAM UNITS IN POWER SYSTEM STUDIES Working Group on Prime Mover and Energy Supply Models for System Dynamic Performance Studies , 1991 .

[8]  R. N. Walters,et al.  Selecting hydraulic reaction turbines , 1976 .

[9]  Marija Ilic,et al.  Hierarchical Power Systems Control: Its Value in a Changing Industry , 1996 .

[10]  Chris Marnay,et al.  Integration of distributed energy resources. The CERTS Microgrid Concept , 2002 .

[11]  P. Kundur,et al.  Dynamics models for combines cycle plants in power system studies , 1994 .

[12]  F. L. Pagola,et al.  Developments in selective modal analysis of small-signal stability in electric power systems , 1990, Autom..

[13]  L. N. Hannett,et al.  Combustion turbine dynamic model validation from tests , 1993 .

[14]  Ping Ju,et al.  Sequential parameter estimation of a simplified induction motor load model , 1995 .

[15]  F. P. de Mello,et al.  Boiler models for system dynamic performance studies , 1991 .

[16]  Longya Xu,et al.  Dynamic model of an integral-cycle controlled single-phase induction machine , 1992 .

[17]  S. Civanlar,et al.  Volt/Var Control on Distribution Systems with Lateral Branches Using Shunt Capacitors and Voltage Regulators Part III: The Numerical Results , 1985, IEEE Transactions on Power Apparatus and Systems.