Implement three-phase source with internal R-L impedance
Specify internal voltages for each phase
Select to specify internal voltage for each phase. Default is cleared. specify 指定
Internal
When this check box is selected (default), the block implements an internal RL inductance. When the check box is cleared, the internal inductance is not modeled.
Specify short-circuit level parameters
Select to specify internal impedance using the inductive short-circuit level and X/R ratio. Default is cleared. This parameter is available only if Internal is selected.
📺️Load Flow Bus
Identify and parameterize load flow bus
Parameters
The Load Flow Bus parameters are used for model initialization only. They have no impact on the simulation performance.
Connectors
Set to single (default) when you perform a positive-sequence load flow. You connect a Load Flow Bus block to any phase (A, B, or C) of every load flow block in the model. The icon of the block displays the number 3, indicating that the block is defined to perform a positive-sequence load flow.
Bus Identification
Enter a meaningful alphanumeric label. The Bus Identification label appears below the block as a block annotation. Default is BUS_1.
Base voltage (Vrms phase-phase)
The base voltage is usually the same as the nominal voltage of the load flow blocks connected to the Load Flow Bus block. The Base voltage values appears below the block as a block annotation. This parameter is available only when the Connectors parameter is set to single. Default is 25e3.
Swing bus or PV bus voltage (pu)
Specify the required bus voltage magnitude, in pu. Depending on the bus type of the load flow blocks connected at that bus, this voltage corresponds to the swing bus voltage or the PV bus voltage. This parameter is available only when the Connectors parameter is set to single. Default is 1.
Swing bus voltage angle (degrees)
The swing bus voltage angle is used as a reference to compute voltage angles of all other buses in the model. This parameter is available only when the Connectors parameter is set to single. Default is 0.
📏Three-Phase V-I Measurement
Measure three-phase currents and voltages in circuit
☘Three-Phase PI Section Line
Implement three-phase transmission line section with lumped parameters
Frequency used for rlc specification
The frequency used for specification of per unit length rlc line parameters, in hertz (Hz). This is usually the nominal system frequency (50 Hz or 60 Hz). Default is 60.
Positive- and zero-sequence resistances
The positive- and zero-sequence resistances in ohms/kilometer (Ω/km). Default is [ 0.01273 0.3864].
Positive- and zero-sequence inductances
The positive- and zero-sequence inductances in henries/kilometer (H/km). The zero-sequence inductance cannot be zero, because it would result in an invalid propagation speed computation. Default is [ 0.9337e-3 4.1264e-3].
Positive- and zero-sequence capacitances
The positive- and zero-sequence capacitances in farads/kilometer (F/km). The zero-sequence capacitance cannot be zero, because it would result in an invalid propagation speed computation. Default is [12.74e-9 7.751e-9].
Line section length
The line section length in kilometers (km). Default is 100.
🧰Three-Phase Series RLC Load
Implement three-phase series RLC load with selectable connection
Nominal phase-to-phase voltage Vn
The nominal phase-to-phase voltage of the load, in volts RMS (Vrms). Default is 1000.
Nominal frequency fn
The nominal frequency, in hertz (Hz). Default is 60.
Specify PQ powers for each phase
Select to specify active powers, inductive reactive powers, and capacitive reactive powers for each phase of the load. Default is cleared.
Active power P (W)
The three-phase active power of the load, in watts. This parameter is visible only when Specify PQ powers for each phase is cleared. Default is 10e3.
Inductive reactive power QL (positive var)
The three-phase inductive reactive power QL, in vars. Specify a positive value or 0. This parameter is visible only when Specify PQ powers for each phase is cleared. Default is 100.
Capacitive reactive power QC (negative var)
The three-phase capacitive reactive power QC, in vars. Specify a positive value or 0. This parameter is visible only when Specify PQ powers for each phase is cleared. Default is 100.
Measurements
Select Branch voltages to measure the three voltages across each phase of the Three-Phase Series RLC Load block terminals. For a Y connection, these voltages are the phase-to-ground or phase-to-neutral voltages. For a delta connection, these voltages are the phase-to-phase voltages.
Select Branch currents to measure the three total currents (sum of R, L, C currents) flowing through each phase of the Three-Phase Series RLC Load block. For a delta connection, these currents are the currents flowing in each branch of the delta.
Select Branch voltages and currents to measure the three voltages and the three currents of the Three-Phase Series RLC Load block.
Default is None.
Place a Multimeter block in your model to display the selected measurements during the simulation. In the Available Measurements list box of the Multimeter block, the measurements are identified by a label followed by the block name.
Load type
Specify the load type.
If you select constant Z (default), the load impedance is determined from the nominal phase-to-phase voltage Vn, active power P, and reactive power (QL-QC) specified on the Parameters tab of the block dialog box. During the load flow solution, the impedance is kept constant. The effective P and Q are therefore varying proportionally to the square of the bus voltage computed by the Load Flow tool.
If you select constant PQ, the active power P and reactive power Q are kept constant and equal to the values specified on the Parameters tab of the block dialog box. When you apply the load flow solution to the model (by clicking the Apply button of the Load Flow tool), the Nominal phase-to-phase voltage Vn parameter on the Parameters tab is automatically adjusted to the phase-to-phase bus voltage computed by the Load Flow tool.
If you select constant I, the load current is kept constant at its nominal value determined from base voltage specified in the dialog box of the associated Load Flow Bus block and from active power P and reactive power QL and QC specified on the Parameters tab of the block dialog box. The effective P and Q are therefore varying proportionally to the bus voltage computed by the Load Flow tool. When you apply the load flow solution to the model (by clicking the Apply button of the Load Flow tool), the p.u. value of the nominal voltage Vn on the Parameters tab is automatically adjusted to the square root of the load voltage (in pu) computed by the Load Flow tool.
🔧Three-Phase Fault
Implement programmable phase-to-phase and phase-to-ground fault breaker system
Initial status
The initial status of the fault breaker is usually the default value, 0 (open). However, you can start the simulation in steady state with the fault initially applied on the system.
Phase A
If selected, the fault switching of phase A is activated. If not selected, the breaker of phase A stays in the status specified in the Initial status parameter. Default is selected.
Phase B
If selected, the fault switching of phase B is activated. If not selected, the breaker of phase B stays in the status specified in the Initial status parameter. Default is selected.
Phase C
If selected, the fault switching of phase C is activated. If not selected, the breaker of phase C stays in the status specified in the Initial status parameter. Default is selected.
Ground
If selected, the fault switching to the ground is activated. A fault to the ground can be programed for the activated phases. For example, if the Phase C and Ground parameters are selected, a fault to the ground is applied to the phase C. The ground resistance is set internally to 1e6 ohms when the Ground parameter is not selected. Default is selected.
Switching times (s)
Specify the vector of switching times when using the Three-Phase Breaker block in internal control mode. At each transition time the selected fault breakers opens or closes depending to the initial status. This parameter is not available if the External parameter is selected. Default is [1/60 5/60].
External
If selected, adds a fourth input port to the Three-Phase Fault block for an external control of the switching times of the fault breakers. The switching times are defined by a Simulink signal (0 or 1) connected to the fourth input port of the block. Default is cleared.
Fault resistances Ron
The internal resistance, in ohms (Ω), of the phase fault breakers. This parameter cannot be set to 0. Default is 0.001.
Ground resistance Rg
This parameter is available only if the Ground parameter is selected. The ground resistance, in ohms (Ω). This parameter cannot be set to 0. Default is 0.01.
Snubbers resistance Rs
The snubber resistances, in ohms (Ω). Set this parameter to inf to eliminate the snubbers from the model. Default is 1e6.
Snubbers capacitance Cs
The snubber capacitances, in farads (F). Set this parameter to 0 to eliminate the snubbers, or to inf to get resistive snubbers. Default is inf.
Measurements
Select Fault voltages to measure the voltage across the three internal fault breaker terminals.
Select Fault currents to measure the current flowing through the three internal breakers. If the snubber devices are connected, the measured currents are the ones flowing through the breakers contacts only.
Select Fault voltages and currents to measure the breaker voltages and the breaker currents.
Default is None.
📐PMU (PLL-Based, Positive-Sequence)
Implements a phasor measurement unit using a phase-locked loop
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