Power System Blockset

Discrete System

Discretize the state-space model of a Power System Blockset circuit.

Library

powerlib

Description

The Discrete System block is used to discretize the state-space model of a Power System Blockset model. Discrete time models will be used for the linear elements as well as for the nonlinear blocks of the Elements, Machines, and Power Electronics libraries of powerlib.

Drag this block in the top-level system of your model and specify the sample-time for the discretization. The state-space matrices of the linear part of the circuit will be discretized using the Tustin integration method, that is equivalent to fixed step trapezoidal integration.

Dialog Box and Parameter

Sample time

The sample time used to discretize the state-space matrices of the linear part of the circuit. Set the Sample time parameter to a value greater than zero to discretize the circuit. The icon displays the value of the sample time. If you set the Sample time parameter to 0, the model will not be discretized and "Continuous system" will be displayed in the block icon.

Limitations

Discretization of circuits containing individual force-commutated switches (GTO, IGBT, or MOSFET) is not possible. If applicable, use instead the Universal Bridge block that allows discretization of GTO, IGBT, and MOSFET blocks.

Examples

See Sessions 3 and 5 in the Tutorial chapter for examples using the Discrete System block.

Diode

Distributed Parameter Line