A new continuation power flow based on Q-limit points

This paper proposes a new continuation power flow method tracing QV constraint exchange points (CEP), at which generators regulating voltages hit the reactive power limits. The proposed method is based on a predictor/corrector scheme to obtain CEPs in succession. The condition for Q-limit immediate instability is derived and used in the algorithm, where the stability of the obtained CEP is checked in each iteration. The point of collapse method is also combined in the algorithm to detect a saddle node bifurcation. The effectiveness of the proposed method is demonstrated through numerical examinations in IEEE 118 bus systems.

[1]  H. Sasaki,et al.  An efficient method to compute closest loadability limit in power systems , 2000 .

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

[3]  F. Alvarado,et al.  Computation of closest bifurcations in power systems , 1994 .

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

[5]  N. Yorino,et al.  A method to approximate a closest loadability limit using multiple load flow solutions , 1997 .

[6]  G. Irisarri,et al.  Maximum loadability of power systems using interior point nonlinear optimization method , 1997 .

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

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

[9]  I. Dobson,et al.  New methods for computing a closest saddle node bifurcation and worst case load power margin for voltage collapse , 1993 .

[10]  Thierry Van Cutsem,et al.  Voltage Stability of Electric Power Systems , 1998 .

[11]  Y. Kataoka,et al.  An approach for the regularization of a power flow solution around the maximum loading point , 1992 .

[12]  Ian A. Hiskens,et al.  Direct calculation of reactive power limit points , 1996 .

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