| Power System Blockset | |
Measure the impedance of a circuit as a function of frequency.
Description
The Impedance Measurement block measures the impedance between two nodes of a circuit, as a function of the frequency. It consists of a current source Iz connected between inputs one and two of the Impedance Measurement block and a voltage measurement Vz connected across the terminals of the current source. The network impedance is calculated as the transfer function H(s) from the current input to the voltage output of the state-space model.
The measurement takes into account the initial status of the Breaker and Ideal Switch blocks. It also allows impedance measurements with Distributed Parameter Line blocks in your circuit.
Dialog Box and Parameter
In that case, you are measuring one third of the zero-sequence impedance and you must apply a multiplication factor of 3 to obtain the correct zero-sequence value.
Limitations
The only nonlinear blocks that are taken into account during the impedance measurement are the Breaker block, the Ideal Switch block, and the Distributed Parameter Line block. All other nonlinear blocks such as machines and power electronic devices are not considered and they will be disconnected during the measurement.
If you plan to connect the Impedance Measurement block in series with an inductance, a current source, or any nonlinear element, you must add a large resistor across the terminals of the block. The reason is that the Impedance Measurement block is simulated as a current source block.
Example
See the Powergui block reference page for an example using the Impedance Measurement block.
See Also
| | IGBT | Linear Transformer | |
