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Power-flow solves for voltage magnitude and voltage angle of the load buses as well as reactive power of the generators to satisfy energy balance throughout the power system. The feature is active only if the corresponding key is in the license. It assumes that taps of transformers and switchable shunt devices are locked.
The power-flow feature in ePHASORSIM is for both balanced systems (positive sequence) that include models of machines and also three-phase unbalance unbalanced systems which include voltage sources. The input data format can be either Unbalanced power-flow is only available for networks defined in Excel (v1.3 8 or later) , PSS/E (v.32) or CYME. It assumes that taps of transformers and switchable shunt devices are locked.
Power-flow executes only on the host machine (offline) but the results can be used as input for real-time simulation (and it has no impact on the runtime performance).
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The table below lists the positive sequence components supported by the Power-Flow.
Component | Excel v1.4 or later | PSS/ | e version 32E v32 | |
|---|---|---|---|---|
Machine* | builtBuilt-in native library | All types of machines in Native Library | GENCLS, GENROU, GENROE, GENSAL, GENSAE | |
Modelica based library | GENCLS, GENROU, GENSAL, GENROE, GENSAE, CSVGN5 | |||
Load | All types of loads in Native Library | Constant Power Load, Constant Impedance Load & Constant Current Load | ||
Voltage source* | Voltage source | - | ||
Branch | All types of line in in Native Library | Supported | ||
Switch | Switch | - | ||
Fixed shunt | - | Supported | ||
Transformer | All types of transformer in Native Library | Both 2-Winding and 3-Winding transformers are supported but control mode is considered to be zero (COD1=COD2=CODE3=0) | ||
Switched shunt | - | Supported but the control mode is considered to be zero (MODSW=0) | ||
FACTS* | Modelica based library | - | Only FACTS device with shunt element is supported (J=0). | |
Two terminal DC line | Modelica based library | Supported but the firing angle limits are not considered. | Supported but the firing angle limits are not considered. | |
Notes
Voltage set-point of Machine, FACTS and Voltage source is read from initial voltage magnitude field of the connected bus, in the bus data record section.
The voltage source supported in the *.xls format will be treated as a slack bus in the power-flow calculation.
To be able to run power-flow for a data which uses FMUs:
GenUnits must have parameters ‘P_gen’, ‘Q_gen’, ‘Vt_abs’, ‘Vt_ang’ defined. These parameters should be also declared in FMUGloassary with the same name if importing data from PSS/eE, PowerFactory or CYME.
If data is imported from Excel file, parameters 'Qmin' and 'Qmax' must be defined in the corresponding Excel sheet for the GenUnit.
Two terminal DC line FMU must have the following fields: ‘NBR’, ‘RCR’, ‘XCR’, ‘EBASR’, ‘TRR’, ‘TAPR’, ‘NBI’, ‘RCI’, ‘XCI’, ‘EBASI’, ‘TRR’, ‘TAPI’, ‘SETVL’, ‘RCOMP’, ‘VSCHED’, ‘RDC’, ‘Vmag_rec’, ‘Vmag_inv’, ‘Vang_rec’, ‘Vang_inv’.
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The table below lists the three-phase components supported by the Power-Flow.
Component | Excel v1.5 or later | CYME | Comments |
|---|---|---|---|
Three Phase Voltage source | Supported** | Source Node | The connected bus should be defined as SLACK bus |
Multi-Phase ZIP Load | Supported | Spot Load, Distributed Load, ECG | wye configuration only |
Multi-Phase PI Line | Supported | Busway, Cable, Overhead line | - |
Three Phase transformer | Supported | Transformer, Regulator | - |
Switch | Supported | Switch, Breaker, Recloser | - |
Multi-Phase Shunt | Supported | - | - |
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