Rectifier Data

This dialog box includes the following areas and tabs:

See Common Tabs for information on the Location, Comments, Hyperlinks, or Collected Data tabs.

See also:

Figure 1: Rectifier Data Dialog Box

Connection Information

Option Description
ID Name

Uniquely identifies the equipment item. The program automatically assigns a name, but you can change it, if needed. The name can be up to 16 characters long.

For rectifiers, the program automatically assigns the names RTF-1, RTF-2, RTF-3, and so on.

Input Bus

ID Name of the AC bus on the input side of rectifier. The based kV of the bus is shown on the right.

Output Bus ID Name of the DC bus on the output side of rectifier. The based kV of the bus is shown on the right.


The phase of the item. Currently, this is for reference only.

Specifications Tab

Option Description
DC Rated kV Name plate voltage rating of DC output in kV.
DC Rated FLA Name plate current rating of DC output in amps.
Type Specify the component for the rectifier. Select from Diode, Thyristor and IGBT. This affects power flow simulation methods. Diode and Thyristor types use Kimbark’s equations to determine the real and reactive power on the Rectifier input, and to control DC voltage or current. The IGBT type controls power factor and voltage. Control fields are specified in the Power Flow tab.
Fault FLA Expected fault current on the DC side, in multiples of full load amp rating.
Fault Time/Block Time Duration the fault current will last. The unit can be seconds or cycles.

Power Flow Tab

Figure 2: Rectifier Data – Power Flow tab

Option Description
Thyristor Control

When the rectifier type is thyristor, the control can be one of the following:

  • Voltage: If the output is voltage controlled, specify the per unit control voltage in the Ctrl kV PU field.
  • Current: If the output is current controlled, specify the output current in the Current Set Point field.
Commutation Impedance

Commutation impedance is used to calculate the power flow using Kimbark’s equations. The rectifier must be fed by a dedicated transformer, where the characteristics are also defined here:

  • Z1: Equivalent impedance in percent. Corresponds to the upstream rectifier transformer.
  • X/R: X/R ratio of the upstream rectifier transformer.
  • kVA: kVA rating base for Z1.
Input PF When the rectifier type is IGBT, this specifies the control input power factor.
Efficiency Ratio of output power to input power in percent.
Ctrl kV PU For IGBT type or voltage control thyristor type, this is the controlled output voltage in per unit.
Current Set Point The fixed value of output current in Amps for current controlled thyristor type.
Alpha Min Minimum firing angle of the rectifier.
Alpha Max Maximum firing angle of the rectifier.

Harmonics Tab

Use the Harmonics tab to indicate whether this equipment item is introducing harmonics into your power system.

Figure 3: Harmonics Tab

Option Description
Load Type

The default is Linear, indicating the equipment does not produce harmonics. Choosing Harmonic makes the item an harmonic source and makes other fields in this tab available to edit.

Note: For an adjustable frequency drive (AFD), the Load Type is always Harmonic.
For motors, the Load Type is Harmonic if the With Adjustable Frequency Drive (AFD) check box is selected on the Specifications tab of the motor; otherwise, it is always Linear.

Fundamental Amps

Use to set the fundamental amps. The options are as follows:

  • Equipment Rating sets Fundm Amps to the equipment rating of the item described in the Specifications tab. 
  • User Specified activates the Fundm Amps field, enabling you to specify a value. 

To use fundamental current calculated by power flow, select Calculated from Power Flow in the Summation Fundamental Voltage area of the Harmonics Options > Control dialog box.

Harmonic Spreadsheet

Use the spreadsheet to enter the harmonic spectrum produced by this item. You can enter up to 30 different harmonics in each equipment item. In the spreadsheet, enter the Harmonic Number (such as 5 for the 5th harmonic), the Harmonic Current in percent of the Fundamental Amps, and the Current Angle. By indicating the current angle, you can simulate transformer phase shift effects on rectifiers so appropriate canceling can take place. The harmonic may be integer or non-integer.

Library Load

Common harmonic spectra may be entered from the device library. For instructions on how to enter your own spectra information, see Harmonics with Spectrum™. After selecting a particular device library spectrum from the Mfr and Type lists, click Import, and that spectrum is entered into the harmonic spreadsheet.

Resistance Factor

EasyPower offers two methods for calculating RH:

  • Resistance varying with a power of the harmonic (R-EXP):
  • RH = RFund * H R-EXP

  • Resistance varying with a percent eddy current factor (%ECF):
  • RH = RFund * (1+ECF*H2)/(1+ECF)

EasyPower defaults all skin effect correction to R-EXP and a value of 0.5.

Typical Resistance Correction Factors




















Other Tabs

See Common Tabs for information on the Location, Comments, Hyperlinks, or Collected Data tabs.

More Information

Database Technical Reference Common Tabs
Notes on Rectifier Modeling  
Notes on Rectifier Power Flow Modeling  
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Help was last updated on 3/22/2019