Design of a Multilevel Class D Voltage Amplifier for Relay Testing

Author

Molina Moreno, Aldo ; Martinez Cardenas, Fernando ; Gutierrez Alcaraz, Guillermo

Author_Institution

Inst. Tecnol. de Morelia, Morelia, Mexico

Volume

12

Issue

4

fYear

2014

fDate

Jun-14

Firstpage

543

Lastpage

549

Abstract

A new design of a high power voltage amplifier, using a multilevel converter, for testing protection relays is presented in this paper. The multilevel converter consists of two cascaded H bridges with asymmetrical sources. The technique of Nine Levels Sinusoidal Pulse Width Modulation (9LS-PWM) is used to generate a high quality output signal. The high fidelity signal, amplified both in voltage and power, is reconstructed through the use of a π filter. The working principle of the converter is simulated and validated through a set of simulation studies using the PSCAD/EMTDC Simulator. Additionally, an analysis of harmonic distortion content and total harmonic distortion (THD), based on several traditional modulation techniques, are presented.

Keywords

PWM power convertors; harmonic distortion; power amplifiers; relay protection; π filter; 9LS-PWM; EMTDC Simulator; PSCAD; THD; asymmetrical sources; cascaded H bridges; harmonic distortion content; high fidelity signal; high power voltage amplifier; high quality output signal; multilevel class D voltage amplifier; multilevel converter; nine levels sinusoidal pulse width modulation; protection relays; relay testing; total harmonic distortion; EMTDC; Integrated circuit modeling; Multiplexing; PSCAD; Pulse width modulation; Relays; Testing; Multilevel Converter; Relay Testing; Voltage Amplifier;

fLanguage

English

Journal_Title

Latin America Transactions, IEEE (Revista IEEE America Latina)

Publisher

ieee

ISSN

1548-0992

Type

jour

DOI

10.1109/TLA.2014.6868853

Filename

6868853