Wye-Connected Load
A three-phase load connected according to the Star scheme.
blockType: AcausalElectricPowerSystems.Passive.RLC_Assemblies.WyeConnectedLoad
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Description
Block Wye-Connected Load simulates a three-phase load connected according to the Star scheme. Each phase of the load can include any combination of resistor ( ), the capacitor ( ) and inductors ( ), connected in series or in parallel. The load is phase-symmetric, that is, the values of resistance, capacitance and inductance of all phases are the same.
Component values , and They 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 , and , 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 through 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.
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 | Parameters of the initial conditions |
|---|---|---|
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Rated voltage Active power |
No |
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Rated voltage Rated frequency Inductive reactive power |
The amount of voltage at the terminals Terminal voltage phase Frequency |
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Rated voltage Rated frequency Capacitive reactive power |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Series RL |
Rated voltage Rated frequency Active power Inductive reactive power |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Series RC |
Rated voltage Rated frequency Active power Capacitive reactive power |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Series LC |
Rated voltage Rated frequency Inductive reactive power Capacitive reactive power |
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 |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Parallel RL |
Rated voltage Rated frequency Active power Inductive reactive power |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Parallel RC |
Rated voltage Rated frequency Active power Capacitive reactive power |
The amount of voltage at the terminals Terminal voltage phase Frequency |
Parallel LC |
Rated voltage Rated frequency Inductive reactive power Capacitive reactive power |
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 |
The amount of voltage at the terminals Terminal voltage phase Frequency |
The values of the components directly
| The structure of the components | Basic parameters | Parameters of the initial conditions |
|---|---|---|
|
Resistance |
No |
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Inductance |
The initial current of the inductor [ Ia Ib Ic ] |
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Container |
Initial capacitor voltage [ Va Vb Vc ] |
Series RL |
Resistance Inductance |
The initial current of the inductor [ Ia Ib Ic ] |
Series RC |
Resistance Container |
Initial capacitor voltage [ Va Vb Vc ] |
Series LC |
Inductance Container |
The initial current of the inductor [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
Series RLC |
Resistance Inductance Container |
The initial current of the inductor [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
Parallel RL |
Resistance Inductance |
The initial current of the inductor [ Ia Ib Ic ] |
Parallel RC |
Resistance Container |
Initial capacitor voltage [ Va Vb Vc ] |
Parallel LC |
Inductance Container |
The initial current of the inductor [ Ia Ib Ic ] Initial capacitor voltage [ Va Vb Vc ] |
Parallel RLC |
Resistance Inductance Container |
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— values for components , and They are set using the values of rated power at rated voltage and frequency. Default parameterization. -
directly— values for components , and They 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 — a 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
Sets the resistor combination ( ), the capacitor ( ) and inductors ( ), connected in series or in parallel.
Resistance — pass resistance:q[<br>] 1.0 Ohm (default)
The resistance of each resistor.
Induction — pass inductance:q[<br>] 1e−3 Gn (default)
The inductance of each coil.
Capacity — pass capacity:q[<br>] 1e−6F (default)
The capacity of each capacitor.
Rated voltage — rated voltage
24E3 V (default)
The voltage for which the load capacities are specified.
Rated electrical frequency — rated pass frequency:q[<br>] 50 Hz (default)
The frequency for which the reactive power of the load is specified.
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.
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.
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.
Initial values
Initial value of current through inductors, [Ia Ib Ic] — initial values of coil currents
zeros(3) (default)
The initial values of the currents through the inductors.
Initial value of voltage across capacitors, [Va Vb Vc] — initial values of voltage across pass capacitors:q[<br>] zeros(3) (default)
The initial voltage values on the capacitors.
Initial value of terminal voltage magnitude, V is the initial value of the voltage at the pass terminals:q[<br>] 24E3 V (default)
The initial value of the terminal voltage.
Initial value of terminal voltage angle, deg — initial value of the voltage phase at the terminals of
0.0 (default)
The initial value of the terminal voltage phase.
Initial value of frequency, Hz — the initial value of the pass frequency:q[<br>] 0.0 (default)
The initial frequency value.
Parasitics
Parasitic series resistance, Ohm — parasitic series resistance
0 Ohm (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.