Power System Blockset    
Series RLC Branch

Implement a series RLC branch.

Library

Elements

Description

The Series RLC Branch block implements a single resistor, inductor or capacitor, or a series combination of these. To eliminate either the resistance, inductance, or capacitance of the branch, the R, L, and C values must be set respectively to zero, zero, and infinity. Only existing elements will be displayed in the block icon.

Negative values are allowed for resistance inductance and capacitance.

Dialog Box and Parameters

Resistance R
The branch resistance, in ohms ().
Inductance L
The branch inductance, in henries (H).
Capacitance C
The branch capacitance, in farads (F).
Measurements
Select Branch voltage to measure the voltage across the Series RLC Branch block terminals.
Select Branch current to measure the current flowing through the Series RLC Branch block.
Select Branch voltage and current to measure the voltage and the current of the Parallel RLC Branch block.
Place a Multimeter block in your model to display the selected measurements during the simulation. In the Available Measurement listbox of the Multimeter block, the measurement will be identified by a label followed by the block name.

Measurement

Label

Branch voltage

ub:

Branch current

ib:

Example

Obtain the frequency response of a fifth-harmonic filter (tuned frequency = 300 Hz) connected on a 60 Hz power system. This example is available in the psbseriesbranch.mdl file.

The network impedance in Laplace domain is:

To obtain the frequency response of the impedance you have to get the state-space model (A B C D matrices) of the system.

This system is a one input (Vsource) and one output (Current Measurement block) system. If you own the Control System Toolbox, you can get the transfer function Z(s) from the state-space matrices and the bode function as follows:

You can also use the Impedance Measurement block and the Powergui block to plot the impedance as function of frequency. In order to measure the impedance you must disconnect the voltage source.

See Also
Series RLC Load, Parallel RLC Branch, Parallel RLC Load


 Saturable Transformer Series RLC Load