Continuation power flow with multiple load variation and generation re-dispatch patterns

Continuation power flow (CPFLOW) with multiple load variation and generation re-dispatch patterns is developed in this paper. The power injection variations are determined by both load variation and real generation dispatch in power systems. To model power injection variations, a piecewise linear model in the power injection space is used to model multiple load variations while the economic dispatch or other generation scheduling schemes is applied to determine the participation factor of each generator. The newly-improved CPFLOW tool is applied to test the impacts of multiple power injection variations on load margin. Our numerical studies indicate that power injection directions can significantly affect the load margin to nose point, and the difference between uniform power injection direction and multiple power injection variations can be more than 28%

[1]  R. H. Lasseter,et al.  Re-dispatching generation to increase power system security margin and support low voltage bus , 2000 .

[2]  A. Zecevic,et al.  The effects of generation redispatch on Hopf bifurcations in electric power systems , 2002 .

[3]  Venkataramana Ajjarapu,et al.  The continuation power flow: a tool for steady state voltage stability analysis , 1991 .

[4]  Ping Yan.  Modified distributed slack bus load flow algorithm for determining economic dispatch in deregulated power systems , 2001, 2001 IEEE Power Engineering Society Winter Meeting. Conference Proceedings (Cat. No.01CH37194).

[5]  Fernando L. Alvarado,et al.  Sensitivity of the loading margin to voltage collapse with respect to arbitrary parameters , 1997 .

[6]  K. Iba,et al.  Calculation of critical loading condition with nose curve using homotopy continuation method , 1991 .

[7]  Claudio A. Canizares,et al.  On the linear profile of indices for the prediction of saddle-node and limit-induced bifurcation points in power systems , 2003 .

[8]  H. Sasaki,et al.  A new continuation power flow based on Q-limit points , 2004, The 2004 47th Midwest Symposium on Circuits and Systems, 2004. MWSCAS '04..

[9]  Hsiao-Dong Chiang,et al.  CPFLOW: a practical tool for tracing power system steady-state stationary behavior due to load and generation variations , 1995 .

[10]  Sandoval Carneiro,et al.  IMPACT OF INDUCTION MOTOR LOADS INTO VOLTAGE STABILITY MARGINS OF LARGE SYSTEMS , 2002 .

[11]  Y. Kataoka,et al.  A probabilistic nodal loading model and worst case solutions for electric power system voltage stability assessment , 2003 .

[12]  Claudio A. Canizares,et al.  Point of collapse and continuation methods for large AC/DC systems , 1993 .

[13]  Hsiao-Dong Chiang,et al.  The generation of ZIP-V curves for tracing power system steady state stationary behavior due to load and generation variations , 1999, 1999 IEEE Power Engineering Society Summer Meeting. Conference Proceedings (Cat. No.99CH36364).

[14]  Wilsun Xu,et al.  Voltage stability analysis using generic dynamic load models , 1994 .

[15]  Ian Dobson,et al.  Voltage collapse precipitated by the immediate change in stability when generator reactive power limits are encountered , 1992 .