Generalized Techniques of Harmonic Elimination and Voltage Control in Thyristor Inverters: Part I--Harmonic Elimination

TLDR

This paper considers the theoretical problem of eliminating harmonics in inverter‑output waveforms. The study develops generalized methods to eliminate a fixed number of harmonics in half‑bridge and full‑bridge inverter outputs, providing solutions for up to five harmonics. Numerical techniques are applied to solve the nonlinear equations, and the remaining higher‑order harmonics can be attenuated using output‑stage filter circuits. The results show the feasibility of obtaining practically sinusoidal output waveforms, which are highly desirable in most inverter applications.

Abstract

This paper considers the theoretical problem of eliminating harmonics in inverter-output waveforms. Generalized methods are developed for eliminating a fixed number of harmonics in the half-bridge and full-bridge inverter-output waveforms, and solutions are presented for eliminating up to five harmonics. Numerical techniques are applied to solve the nonlinear equations of the problem on the computer. The uneliminated higher order harmonics can be easily attenuated by using filter circuits in the output stage of the inverter. The results show the feasibility of obtaining practically sinusoidal output waveforms, which are highly desirable in most inverter applications.