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Multiphase Load
- Sylvain Ménard
- Luc Marcil
- Amira Aouina
eOn this page:
The multiphase load can represent a 1, 2, or 3-phase load. Thus, there are three types of loads in this library as follows:
Single Phase ZIP Load
Two Phase ZIP Load
Three Phase ZIP Load
The ZIP load is a combination of constant impedance, constant current, and constant power loads. The user needs to define the portion of each part out of 1 or 100. Each load can have its own profile to vary during the simulation. The load profile can be defined with incoming pins for each phase. For example,
To set the active power of phase 1: loadID/P1
To set the reactive power of phase 1: loadID/Q1
Single Phase ZIP Load
Parameters
Symbol | Description | Unit |
|---|---|---|
ID | Load name | a unique name |
Status | Connect/Disconnect status | Initial value 1 (0 for disconnected) |
V (kV) | Nominal voltage (phase-to-phase) | kV |
Bandwidth* (pu) | Cut-off voltage to convert to Z load | p.u. |
Conn. type | Connection type | ‘wye’ for Yg ‘delta’ for Delta |
K_z* | Constant impedance percentage | p.u. |
K_i* | Constant current percentage | |
K_p* | Constant power percentage | |
Use initial voltage? | Determines if the assigned power is based on nominal or initial voltage (from page Bus) | 0: nominal voltage 1: initial voltage |
Bus1 | Name of phase 1 of the connected bus | a unique name |
P1 (kW) | Active power phase 1 | kW |
Q1 (kVAr) | Reactive power phase 1 | kVAr |
Two Phase ZIP Load
Parameters
Symbol | Description | Unit |
|---|---|---|
ID | Load name | a unique name |
Status | Connect/Disconnect status | Initial value 1 (0 for disconnected) |
V (kV) | Nominal voltage (phase-to-phase) | kV |
Bandwidth* (pu) | Cut-off voltage to convert to Z load | p.u. |
Conn. type | Connection type | ‘wye’ for Yg ‘delta’ for Delta |
K_z* | Constant impedance percentage | p.u. |
K_i* | Constant current percentage | |
K_p* | Constant power percentage | |
Use initial voltage? | Determines if the assigned power is based on nominal or initial voltage (from page Bus) | 0: nominal voltage 1: initial voltage |
Bus1 | Name of phase 1 of the connected bus | a unique name |
Bus2 | Name of phase 2 of the connected bus | |
P1 (kW) | Active power phase 1 | kW |
Q1 (kVAr) | Reactive power phase 1 | kVAr |
P2 (kW) | Active power phase 2 | kW |
Q2 (kVAr) | Reactive power phase 2 | kVAr |
Three Phase ZIP Load
Parameters
Symbol | Description | Unit |
|---|---|---|
ID | Load name | a unique name |
Status | Connect/Disconnect status | Initial value 1 (0 for disconnected) |
V (kV) | Nominal voltage (phase-to-phase) | kV |
Bandwidth* (pu) | Cut-off voltage to convert to Z load | p.u. |
Conn. type | Connection type | ‘wye’ for Yg ‘delta’ for Delta |
K_z* | Constant impedance percentage | p.u. |
K_i* | Constant current percentage | |
K_p* | Constant power percentage | |
Use initial voltage? | Determines if the assigned power is based on nominal or initial voltage (from page Bus) | 0: nominal voltage 1: initial voltage |
Bus1 | Name of phase 1 of the connected bus | a unique name |
Bus2 | Name of phase 2 of the connected bus | |
Bus3 | Name of phase 3 of the connected bus | |
P1 (kW) | Active power phase 1 | kW |
Q1 (kVAr) | Reactive power phase 1 | kVAr |
P2 (kW) | Active power phase 2 | kW |
Q2 (kVAr) | Reactive power phase 2 | kVAr |
P3 (kW) | Active power phase 3 | kW |
Q3 (kVAr) | Reactive power phase 3 | kVAr |
Notes
(*) For constant current and constant power loads, if the p.u. of voltage value is over 1+Bandwidth or below 1-Bandwidth, load will change to Z type.
(**) The values of K_z, K_i and K_p must fit in the following equation: K_z + K_i + K_p = 1 or 100.
In the current version of ePHASORSIM, only Yg connection is supported for power-flow calculations.
Available I/O pins
No | Pin Description | Pin Type | Value/Unit | Instruction |
|---|---|---|---|---|
1 | Set/Get status | I/O | 0: Disconnected 1: Connected | loadID/status |
2 | Set/Get powers of load j | I/O | kW kVAr | loadID/Pj loadID/Qj where j is 1, 2 or 3 |
3 | Get current magnitude of load j | O | A (RMS) | loadID/Imagj where j is 1, 2 or 3 |
4 | Get current angle of load j | O | Degree | loadID/Iangj where j is 1, 2 or 3 |
Example
See the Load page in phasor08_IEEE13.xlsx file in ePHASORSIM example phasor08.
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