Delta-Connected Load
A three-phase load connected according to the Triangle scheme.
blockType: AcausalElectricPowerSystems.Passive.RLC_Assemblies.DeltaConnectedLoad
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Description
Block Delta-Connected Load simulates a three-phase load connected by a triangle. Each phase of the load can include any combination of a resistor (R), a capacitor (C) and an inductor (L) connected in series or parallel. The load is phase-symmetric, that is, the values of resistance, capacitance and inductance of all phases are the same.
The values of the R, L, and C components can be set either directly as resistance, inductance, and capacitance, or through the values of rated powers (i.e., at rated voltage and frequency).
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If the block is parameterized directly through the values R, L and C, then a three-element vector is set for initialization- a string of initial voltages for the capacitor and a three-element vector-a string of initial currents for the inductor.
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If the unit is parameterized using the nominal power values, the initial voltage value, the initial voltage phase, and the initial frequency are set for initialization. For example, if the load is connected directly to a three-phase voltage source, the initial values should be equal to the RMS values of the line voltage, frequency, and phase of this source. To set the initial voltage to zero, set the initial voltage to 0.
For certain combinations of R, L and C, for some circuit topologies, set values for parasitic resistance or conductivity that help the simulation to converge numerically. These parasitic terms ensure that the inductor has a small parallel resistive path and the capacitor has a small series resistance. When you parameterize the unit in terms of rated capacities, the rated power values do not take into account these small parasitic conditions. The rated capacities represent only the R, L, and C values of the load itself.
Parameterization of the block
The following two tables list the block parameters for each component structure based on the selected parameterization option.:
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According to the rated power.
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The values of the components directly.
According to the rated power
| The structure of the components | Basic parameters | Parasitic parameters | Parameters of the initial conditions |
|---|---|---|---|
R |
Rated voltage Active power |
No |
No |
L |
Rated voltage Rated frequency Inductive reactive power |
Parasitic parallel conduction |
The amount of voltage at the terminals Terminal voltage phase Frequency |
C |
Rated voltage Rated frequency Capacitive reactive power |
Parasitic sequential resistance |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Series RL |
Rated voltage Rated frequency Active power Inductive reactive power |
Parasitic parallel conduction |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Series RC |
Rated voltage Rated frequency Active power Capacitive reactive power |
No |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Series LC |
Rated voltage Rated frequency Inductive reactive power Capacitive reactive power |
Parasitic parallel conduction |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Series RLC |
Rated voltage Rated frequency Active power Inductive reactive power Capacitive reactive power |
Parasitic parallel conduction |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Parallel RL |
Rated voltage Rated frequency Active power Inductive reactive power |
No |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Parallel RC |
Rated voltage Rated frequency Active power Capacitive reactive power |
Parasitic sequential resistance |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Parallel LC |
Rated voltage Rated frequency Inductive reactive power Capacitive reactive power |
Parasitic sequential resistance |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Parallel RLC |
Rated voltage Rated frequency Active power Inductive reactive power Capacitive reactive power |
Parasitic sequential resistance |
The amount of voltage at the terminals Terminal voltage phase Frequency |
The values of the components directly
| The structure of the components | Basic parameters | Parasitic parameters | Parameters of the initial conditions |
|---|---|---|---|
R |
Resistance |
No |
No |
L |
Inductance |
Parasitic parallel conduction |
The initial current of the inductor [ Ia Ib Ic ] |
C |
Container |
Parasitic sequential resistance |
Initial capacitor voltage [ Va Vb Vc ] |
Series RL |
Resistance Inductance |
Parasitic parallel conduction |
The initial current of the inductor [ Ia Ib Ic ] |
Series RC |
Resistance Container |
No |
Initial capacitor voltage [ Va Vb Vc ] |
Series LC |
Inductance Container |
Parasitic parallel conduction |
The initial current of the inductor [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
Series RLC |
Resistance Inductance Container |
Parasitic parallel conduction |
The initial current of the inductor [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
Parallel RL |
Resistance Inductance |
No |
The initial current of the inductor [ Ia Ib Ic ] |
Parallel RC |
Resistance Container |
Parasitic sequential resistance |
Initial capacitor voltage [ Va Vb Vc ] |
Parallel LC |
Inductance Container |
Parasitic sequential resistance |
The initial current of the inductor [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
Parallel RLC |
Resistance Inductance Container |
Parasitic sequential resistance |
The initial current of the inductor [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
Parameters
Main
Parameterization — parameterization of
by power (default) | directly
Parameterization of the block:
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by power— The values for the R, L and C components are set using the rated power values at the rated voltage and frequency. Default parameterization. -
directly— The values for the R, L, and C components are set directly as resistance, inductance, and capacitance.
Switching the value of the Parameterization parameter resets the value of the Component structure parameter. First, select the value of the Parameterization parameter, and then the Component structure. If you switch the value of the Parameterization parameter later, check the value of the Component structure parameter and select it again, if necessary.
Component structure — combination of R, L and C
R (default) | L | C | Series RL | Series RC | Series LC | Series RLC | Parallel RL | Parallel RC | Parallel LC | Parallel RLC
Specifies a combination of a resistor (R), a capacitor (C), and an inductor (L) connected in series or parallel.
Resistance — pass resistance:q[<br>] 1.0 Ohm (default)
The resistance of each resistor.
Dependencies
This parameter is used only when selecting a value. Specify component values directly the Parameterization parameter and the selection of the component structure that includes the resistor.
Induction — pass inductance:q[<br>] 1e−3 Gn (default)
The inductance of each coil.
Dependencies
This parameter is used only when selecting a value. Specify component values directly the Parameterization parameter and the selection of the component structure, including the inductor.
Capacity — pass capacity:q[<br>] 1e−6F (default)
The capacity of each capacitor.
Dependencies
This parameter is used only when selecting a value. Specify component values directly the Parameterization parameter and the selection of the component structure that includes the capacitor.
Rated voltage — rated voltage
24E3 V (default)
The voltage for which the load capacities are specified.
This parameter is used only when specifying values for rated power.
Dependencies
This parameter is used only when selecting a value. Specify by rated power the Parameterization parameter.
Rated electrical frequency — rated pass frequency:q[<br>] 50 Hz (default)
The frequency for which the reactive power of the load is specified.
Dependencies
This parameter is used only when selecting a value. Specify by rated power the Parameterization parameter.
Real power — total active power dissipation
1E3W (default)
The total active power dissipated by a three-phase load at rated voltage. The value must be higher 0.
Dependencies
This parameter is used only when selecting a value. Specify by rated power the Parameterization parameter and the selection of the component structure that includes the resistor.
Inductive reactive power — inductive reactive power
1e2 In*A (default)
The total inductive reactive power consumed by a three-phase load at rated voltage. The value must be greater than 0.
Dependencies
This parameter is used only when selecting a value. Specify by rated power the Parameterization parameter and the selection of the component structure, including the inductor.
Capacitive reactive power — total capacitive reactive power
−1e2 In*A (default)
The total capacitive reactive power consumed by a three-phase load at rated voltage. The value must be less than 0.
Dependencies
This parameter is used only when selecting a value. Specify by rated power the Parameterization parameter and the selection of the component structure that includes the capacitor.
Parasitics
Parasitic series resistance, Ohm — parasitic series resistance
0 Ohms (default)
It represents small parasitic effects. The value of the parameter corresponds to the value of the series resistance added to all instances of capacitors in the load.
Parasitic parallel conduction, 1/Ohm — parasitic parallel conduction
0 1/Ohm (default)
It represents small parasitic effects. The parameter value corresponds to the parallel conduction value added to all instances of inductors in the load.
If you set the Component structure parameter to one of the values Series RL, Series LC or Series RLC The parasitic parallel conduction is connected through a complete block branch.