Rectifier Data

This dialog box includes the following areas and tabs:

• Connection Information
• Specifications
• Power Flow
• Harmonics
• Imported Data
• Comments
• Hyperlinks

See also:

• Notes on Rectifier Modeling
• Notes on Rectifier Power Flow Modeling

Figure 1: Rectifier Data Dialog Box

Connection Information

ID Name. Uniquely identifies the rectifier. This ID name is sometimes referred to as the rectifier name, and can be up to 16 characters long. The names default to RTF-1, RTF-2, RTF-3, and so on as you enter new rectifiers on the one-line diagram, but you can change those names as needed.

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.

Specifications

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

Figure 2: Rectifier Data – Power Flow tab

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

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

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.

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 5^th 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 R_H:

• Resistance varying with a power of the harmonic (R-EXP):

R_H = R_Fund * H ^R-EXP

• Resistance varying with a percent eddy current factor (%ECF):

R_H = R_Fund * (1+ECF*H²)/(1+ECF)

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

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.

Imported Data

This tab is read-only and appears only if you have imported data from an SKM Data Format file. See Importing an SKM Format File for more information.

Comments

See Comments for information.

Hyperlinks

See Hyperlinks for information.

More Information