Tap-Changer
Determination of the transformer’s RPN branch number.
blockType: SubSystem
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Path in the library: |
Description
Block Tap-Changer determines the number of the transformer’s RPN branch. Connect the Tap output to the Tap input of the unit Three-Winding Transformer (Three-Phase) to control the transformation coefficient. At the same time, the values of the block parameters are Tap-Changer They must correspond to the parameters of the same name in the transformer.
If for the parameter Mode the value is set Tap control, the position of the branch is controlled by the input signal. If for the parameter Mode the value is set Voltage regulation The position of the branch is controlled by an internal voltage regulator, which compares the input signal with the reference voltage.
Ports
Entrance
# c is the control input used to control the position of the RPN branch
+
scalar
Details
The signal used to control the position of the transformer’s RPN branch. The position of the transformer branch increases when the input signal c becomes greater than the set value of the parameter Threshold. The position of the branch decreases when the input signal c becomes less than the negative value of the parameter Threshold.
The new branch position takes effect after the expiration of the time specified in the parameter Tap selection time, s.
Dependencies
To use this port, set the parameter Mode meaning Tap control.
| Типы данных |
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| Support for complex numbers |
None |
# V_pu is a voltage measurement signal used to control the position of the RPN branch
+
scalar
Details
The signal used to control the position of the RPN branch of a transformer with an internal voltage regulator. Use the voltage value in relative units (OE) measured on the secondary winding or on the remote busbar.
The position of the transformer branch increases when the difference between the input signal V_pu and the parameter value Reference voltage Vref, pu the parameter value is getting larger Dead band, pu, divided by 2, for a time exceeding the value of the parameter Delay, s.
The branch position decreases when the difference between the input signal V_pu and the parameter value Reference voltage Vref, pu becomes less than the negative value of the parameter Dead band, pu, divided by 2, for a time exceeding the value of the parameter Delay, s.
Dependencies
To use this port, set the parameter Mode meaning Voltage regulation.
| Типы данных |
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| Support for complex numbers |
None |
Output
# Tap — output signal of the branch number
+
scalar
Details
An output signal indicating the current position of the branch.
| Типы данных |
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| Support for complex numbers |
None |
Parameters
Main
# Minimum tap position — minimum position of the RPN branch
Details
The minimum position of the transformer branch. The value of this parameter is usually in the range of −20 before +20.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Maximum tap position — the maximum position of the RPN branch
Details
The maximum position of the transformer branch. The value of this parameter is usually in the range of −20 before +20.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Initial tap position — the initial position of the RPN branch
Details
The initial position of the branch when starting the simulation. The initial position should be in the range between the minimum and maximum positions of the RPN branch. When the branch position is 0, the voltage transformation coefficient is 1 O.E. (nominal value).
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Tap selection time, s — branch switching time, s
Details
The time it takes to switch the branch from one position to another. The value of this parameter is usually in the range of 3 before 10 seconds.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
Tap-changer Control
#
Mode —
branch position control mode
Tap control | Voltage regulation
Details
Set the value Tap control to control the position of the transformer branch using the input signal c. Set the value Voltage regulation to control the position of the transformer branch using an internal voltage regulator using the input signal V_pu.
| Values |
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| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Threshold — threshold value of the control signal
Details
The threshold value of the control signal at which the branch position changes. To increase the branch position, apply a control signal c exceeding this value. To reduce the position of the branch, apply a control signal c less than the negative value of this parameter.
Dependencies
To use this parameter, set for the parameter Mode meaning Tap control.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Reference voltage Vref, pu — reference voltage, O.E.
Details
The reference voltage of the voltage regulator in relative units.
Dependencies
To use this parameter, set for the parameter Mode meaning Voltage regulation.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Dead band, pu — the dead zone of the voltage regulator, O.E.
Details
The dead zone of the voltage regulator in relative units.
Dependencies
To use this parameter, set for the parameter Mode meaning Voltage regulation.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
# Delay, s — delay of the voltage regulator, with
Details
The delay of the voltage regulator in seconds.
Dependencies
To use this parameter, set for the parameter Mode meaning Voltage regulation.
| Default value |
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| Program usage name |
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| Evaluatable |
Yes |
Sample time
# Sample time, s — sampling interval, s
Details
The block sampling interval 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 |