WSCC 9-Bus System

WSCC 9-bus test system (also known as P.M Anderson 9-bus) represents a simple approximation of the Western System Coordinating Council (WSCC) to an equivalent system with 9 buses and 3 generators. This particular test case also includes 3 two-winding transformers, 6 lines and 3 loads. The base kV levels are 13.8 kV, 16.5 kV, 18 kV, and 230 kV. The single-line diagram of the WSCC 9-bus case is shown below [1]:


The modeling of the bus system has been implemented in various software tools. The files are provided below:

IEEE Common Data Format (CDF Format) [Download]
DigSILENT PowerFactory (v. 14.1) [Download]
ETAP (v. 12.6) [Download]
PowerWorld Simulator (v. 18) [Download]
PSAT/MATLAB [Download]
Siemens PSS/E (v. 33) [Download]
Simulink/MATLAB  [Download]


[1] P. M. Anderson and A. A. Fouad, Power System Control and Stability, 2nd ed. New York: IEEE Press, 2003.
[2] The Illinois Center for a Smarter Electric Grid (ICSEG), WSCC 9-Bus System,Power Cases.
[3] Francisco M. Gonzalez-Longatt, “Test Case P.M. Anderson Power System”, Power Systems Test Cases.
[4] ETAP, ETAP 12.6, 2015.
[5] DigSILENT PowerFactory, DigSILENT PowerFactory 14.1, 2015.
[6] Jconto, “Dynamic data for IEEE 9 bus”, PSSE forum.
[7] Ray D. Zimmerman, Carlos E. Murillo-Sánchez et. al., “MATPOWER: A MATLAB Power System Simulation Package”.
[8] J. Pettikkattil, “IEEE 9 Bus”, Mathworks Simulink File Exchange Center.
[9] Al-Roomi, Power Flow Test Cases, 9-Bus System (WSCC Test Case.