First-Order Filter
A first-order filter.
blockType: SubSystem
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Path in the library: |
Description
Block First-Order Filter implements one of the following transfer functions depending on the parameter value Filter type:
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Low-pass filter:
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High-pass filter:
Where
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— Laplace operator;
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— time constant.
Features
The main characteristics of the block First-Order Filter are:
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The input port accepts a vector from signals and implements filters. This feature is especially useful for designing controllers in three-phase systems ( );
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It is possible to initialize the filter states for the DC and AC Inputs specified.
Ports
Input
#
IN_1
—
filter input
scalar | vector
Details
The input signal of the first-order filter, specified as a scalar or vector.
| Data types |
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| Complex numbers support |
I don’t |
Output
#
OUT_1
—
filter output signal
scalar | vector
Details
The output signal of the first-order filter, returned as a scalar or vector.
| Data types |
|
| Complex numbers support |
I don’t |
Parameters
Main
#
Filter type —
selecting the filter type
Lowpass | Highpass
Details
Determine the type of first-order filter. Set the value Lowpass to implement a low-pass filter, or set the value Highpass to implement a high-pass filter.
| Values |
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| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Time constant, s — filter time constant
Details
The time constant of the first-order filter, set in seconds.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Sample Time — sampling period
Details
Specify the sampling period of the block in seconds. Set the value 0 to implement a continuous block.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Initialize filter states: — the initial value of alternating and direct current
Details
Select this option to initialize the filter states according to the parameters. AC initial input [ Mag, Phase (degrees), Freq (Hz) ] and DC initial input.
| Default value |
|
| Program usage name |
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| Evaluatable |
Yes |
# AC initial input [Magnitude, Phase (deg), Frequency (Hz)] — the initial value of the variable component
Details
Specify the initial value of the variable component of the input signal: amplitude, phase in degrees, and frequency in Hz. If the input signal is a vector ( signals), specify the matrix on , where each row of the matrix corresponds to a specific input. The phase can have any value. The amplitude and frequency should have a positive value.
Dependencies
To use this option, check the box Initialize filter states:.
| Default value |
|
| Program usage name |
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| Evaluatable |
Yes |
# DC initial input — the initial value of the constant component
Details
Specify the initial value of the constant component of the input signal. If the input signal is a vector, specify the vector on , where each value corresponds to a specific input.
Dependencies
To use this option, check the box Initialize filter states:.
| Default value |
|
| Program usage name |
|
| Evaluatable |
Yes |