CPFLOW - A PRACTICAL TOOL FOR TRACING POWER-SYSTEM STEADY-STATE STATIONARY BEHAVIOR DUE TO LOAD AND GENERATION VARIATIONS

In this paper, a computer package called CPFLOW which is a comprehensi ve tool for tracing power system steady-state stationary behavior due to parameter variations is presented. Tire variations include general bus real and/or reactive loads, area real and/or reactive loads, or sy stem-wide real and/or reactive loads, and real generation at P-V buses (e.g. determined ly economic dispatch or participation factor). The m ain advantages of CPFLOW over repetitive power flow calculations are i ts computational speed and reliability as well as its wide applicabili ty. A detailed description of the implementation regarding the predict or, corrector, step-size control and parameterizations employed in CPF LOW is presented. CPFLOW has comprehensive modeling capability and can handle power systems up to 12000 buses. For an illustrative purpose, CPFLOW is applied to a 3500-bus power system with a comprehensive set of operational limits and controls.