Lines
Transmit single- and three-phase power using cables and lines.
For help deciding which block to use to model your cables or line, see Choose Blocks to Model Cables or Lines.
Simscape Blocks
| AC Cable (Three-Phase) | Three-phase AC power cable |
| Coupled Lines (Pair) | Magnetically couple two lines |
| Coupled Lines (Three-Phase) | Magnetically couple three-phase lines |
| DC Cable | High-fidelity frequency-dependent DC cable (Since R2025a) |
| Frequency-Dependent Overhead Line (Three-Phase) | Three-phase overhead line which includes effects that vary as a function of frequency |
| Transmission Line | Delay-based, lumped parameter, or distributed transmission line |
| Transmission Line (Three-Phase) | Three-phase transmission line using lumped-parameter pi-section line model |
Topics
- Model Cables and Lines in Simscape
Determine whether you need a delay-based, lumped-parameter, or distributed model and select a block that uses that model to represent your conductor arrangement.
Featured Examples
AC Cable with Bonded Sheaths
A three-phase cable model comprised of multiple pi-sections. Each phase is enclosed in a conductive sheath. The conductive sheath is connected to ground at either end of the cable through a simple resistance. A high-voltage source provides power to an unbalanced resistive load through the power cable. You can configure the sheath to be either series-bonded or cross-bonded. You can also configure the number of pi-sections. Increasing the number of pi-sections improves the accuracy but slows down the simulation. To facilitate convergence, the voltage source includes an internal impedance.
Model High-Voltage Direct-Current Transmission Using Modular Multilevel Converters
Models a high-voltage, direct-current (HVDC) transmission system using modular multilevel converters (MMC).
Frequency-Dependent Transmission Line
A custom frequency-dependent transmission line model. The characteristic admittance and propagation function are first derived from the frequency-dependent resistance, reactance, and susceptance. The derived values are fitted using RF Toolbox. The Universal Line Model (ULM) [1] is then implemented in Simscape based on the fitted parameters. The results from the frequency-dependent transmission line model and the classic pi-section transmission line model are compared.
IEEE 9-Bus System
Model a 9-bus three-phase power system network. This example is based on the IEEE® benchmark test case. For more information, see "Power System Control and Stability" by P. M. Anderson and A. A. Fouad (IEEE Press, 2003).
