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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
| 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
| 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
| 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 |
(*) 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.xls file in demo PHASOR-08.
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