Multimeter (SimPowerSystems)

Measure the voltages and currents specified in dialog boxes of Power System Blockset blocks

Library

Measurements

Description

The Multimeter block is used to measure voltages and currents of the measurements described by the dialog boxes of Power System Blockset blocks.

The powerlib blocks listed in the following table have a special parameter (Measurements) that allows you to measure voltages or currents related to the block. Choosing voltages or currents through this measurement parameter is equivalent to connecting an internal voltage or current measurement block inside your blocks. The measured signals can be observed through a Multimeter block placed in your circuit.

Drag the Multimeter block into the top-level system of your circuit and double-click the icon to open the graphical user interface (GUI).

Block Name
Block Name

AC Current Source
Parallel RLC Branch

AC Voltage Source
Parallel RLC Load

Controlled Current Source
PI Section Line

Controlled Voltage Source
Saturable Transformer

DC Voltage Source
Series RLC Branch

Breaker
Series RLC Load

Distributed Parameter Line
Surge Arrester

Linear Transformer
Three-Phase Transformer (Two and Three Windings)

Mutual Inductance
Universal Bridge

Block Name	Block Name
AC Current Source	Parallel RLC Branch
AC Voltage Source	Parallel RLC Load
Controlled Current Source	PI Section Line
Controlled Voltage Source	Saturable Transformer
DC Voltage Source	Series RLC Branch
Breaker	Series RLC Load
Distributed Parameter Line	Surge Arrester
Linear Transformer	Three-Phase Transformer (Two and Three Windings)
Mutual Inductance	Universal Bridge

Dialog Box and Parameters

Available Measurements: The Available Measurements list box shows the measurements in the Multimeter block. Use the >> button to select measurements from the Available Measurements list box. Click the Update button to refresh the list of available measurements in the Multimeter block.; The measurements in the list box are identified by the name of the block where the measurement is done. The type of measurement (voltage measurement, current measurement, or flux) is defined by a label preceding the block name. See the reference sections of blocks listed in the previous table for a description of these measurements.
Selected Measurements: The Selected Measurements list box shows the measurements sent to the output of the block. You can reorder the measurements by using the Up, Down, and Remove buttons. The +/- button allow you to reverse the polarity of any selected measurement.
Plot selected measurements: If selected, displays a plot of selected measurements using a MATLAB figure window. The plot is generated when the simulation stops.
Output type: Specifies the format of the output signals when the block is used in a phasor simulation. The Output signal parameter is disabled when the block is not used in a phasor simulation. The phasor simulation is activated by a Powergui block placed in the model.; Set to Complex to output the selected measurements as complex values. The outputs are complex signals.; Set to Real-Imag to output the real and imaginary parts of the measurements. For each selected measurement, the multimeter outputs the real and imaginary parts.; Set to Magnitude-Angle to output the magnitude and angle of the selected measurements. For each selected measurement, the multimeter outputs the magnitude and angle values.; Set to Magnitude to output the magnitude of the selected measurements.

Example

The psbcompensated.mdl demo uses a Multimeter block to measure the voltage at the secondary winding of a Saturable Transformer block and the currents flowing through two Series RLC Load blocks.

A Multimeter block is dragged into the model. In the dialog box of the 250 MVA block, set the Measurements parameter to All measurements (V,I,flux). In the 110 Mvar block, set it to Branch voltage and in the 110 Mvar1 block, set it to Branch voltage and current.

The output of the Multimeter block is connected to a Scope block in order to display the measurements during the simulation. In addition, you can check the Plot selected measurements parameter to display a plot of selected measurements when simulation stops.

Open the Multimeter block dialog box and select the signals you want to observe, as shown on the Parameters and Dialog Box section of the Multimeter block. Notice the labels used to defined the available measurements in the Multimeter block. See the reference section of the Saturable Transformer block and Series RLC Load block for a description of these labels.

Start the simulation. After 0.4 seconds, the simulation stops and a MATLAB figure window opens to display the selected measurements in the Multimeter block.

Multiband Power System Stabilizer Mutual Inductance