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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

StatusConnect/Disconnect statusInitial 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

StatusConnect/Disconnect statusInitial 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

StatusConnect/Disconnect statusInitial 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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