CYMFLOW is the analysis module of PSAF dedicated to power flow analysis in three-phase electric power networks. It is equipped with powerful analytical options and alternative solution techniques.

CYMFLOW utilizes state of the art sparse matrix/vector methods and multiple solution algorithms:

• Full Newton-Raphson.
• Fast Decoupled (with or without constraints).
• Gauss-Seidel.

CYMFLOW is the main analysis module of PSAF and has a seamless interface with the other PSAF Modules namely:

• CYMFAULT to communicate the pre-fault voltage profile, current flows and transformer tap positions, for fault studies taking into account pre-fault system loading.
• CYMHARMO to communicate the fundamental frequency voltages and currents for harmonic distortion calculations.
• CYMSTAB to communicate the initial conditions to the transient stability simulator.
• CYMVSTAB for static Voltage Stability Studies.
• CYM-Motor Start account for system wide voltage drops during motor start.
• CYM-AC Contingency to solve unlimited variations of a base network.

• Analyze Networks with thousands of buses and branches.
• Multiple swing buses allowed.
• Automatic swing bus selection for isolated subsystems.
• Distributed Swing bus option.
• Simultaneous solution for islanded networks.
• Area Interchange with area control generators.
• Generator reactive power limits and remote voltage control.
• Local or remote control of voltage and reactive power flow through tap changing transformers.
• Control of real power flow through phase-shifting transformers.
• Switchable shunt element.
• Generalized load modeling, including Constant Power, Impedance and Current.
• Representation and control of DC lines.
• Wind Energy Conversion Systems (WECS).
• Modeling and representation of FACTS devices (UPFC and STACOM).
• Transformer inrush currents.
• Color coding on the network One-Line Diagram of overloaded equipment and buses with voltage violations.
• User-defined units for Bus voltages and line flows for both tabular and graphical results.
• Tabular reports can also be directly exported to other spreadsheet programs such as MS-Excel.