Power flow analysis

Power flow analysis module

General

Eaton's CYME Power Flow analysis software uses state-of-the-art sparse matrix/vector methods and multiple solution algorithms:

• Full Newton-Raphson
• Fast decoupled
• Gauss-Seidel

The Power Flow program is the main module of the CYME software for the analysis of industrial and transmission power systems and it has a seamless interface with other modules, such as:

• Fault Analysis: for fault studies taking into account pre-fault system loading
• Harmonic Analysis: for the calculation of the fundamental frequency voltage and current profiles  required for harmonic distortion indices calculations
• Transient Stability: to set the initial condition of the system as required by the network control models for transient stability studies
• Dynamic Motor Starting module: to account for system-wide voltage drops during induction and synchronous motor-starting studies

Features

• Analyses networks with thousands of buses and branches
• Multiple swing buses allowed
• Automatic swing bus selection for isolated subsystems
• Simultaneous solution for islanded networks
• Detailed equipment modelling of induction and synchronous motors, variable frequency drives, bus ways and all necessary network elements for an accurate representation of the network
• Synchronous generator
  • Reactive power limits and remote voltage control
  • Generator reactive power capability curves
• Local or remote control of voltage and reactive power flow through tap-changing transformers
• Phase angle shift transformer with active power control
• Cogeneration modelling, including:
  • Induction generators
  • Wind energy conversion systems (WECS)
  • Photovoltaic (PV cells)
  • Fuel cells
  • Micro-turbines
• Comprehensive representation of DC transmission lines with rectifier and inverter controls
• Flexible AC transmission systems (FACTS) representation of:
  • Static synchronous compensator (STATCOM)
  • Unified power flow controller (UPFC)
• Customer load model library manager for any type of load model, including:
  • Constant power, constant current and constant impedance
  • Composite load model
  • Voltage sensitivity exponent load model
• Capacitors with the following control types: voltage, current, reactive current, reactive power, power factor, temperature and time-controlled
• Switchable shunt banks of both capacitive and inductive elements
• Scaling factors applied to the generators and to the loads on the whole network or by zone
• Global parameters to include or exclude any types of equipment from the analysis
• Five limit categories for nominal, planning, emergency loading or any user-defined criteria
• User-defined units for bus voltages, generator productions and branch flows on both one-line diagrams and tabular reports
• Tabular reports can also be directly exported to other spreadsheet programs, such as Microsoft Excel
• Colour-coding on the network one-line diagram as per user-defined criteria, for example:
  • Overloaded equipment
  • Voltage violations of buses and nodes
  • Visualisation of conductor rating that may reflect, for example, improperly sized cables
  • System voltage levels (maybe with image)