TEK-DARBE MODÜLASYONLU BİR FAZLI EVİRİCİ SÜRÜCÜ SİSTEMİNDE HARMONİK ELİMİNASYONU İÇİN YENİ BİR YAKLAŞIM

Bu makalede tek fazlı bir evirici sürücüsü için kısmi kare dalga yönteminin özel bir uygulaması olan tek darbe modülasyonlu bir kontrol yöntemi önerilmiştir. Bu yöntem ile altı adımlı eviricilerde olduğu gibi evirici çıkış geriliminde çift harmoniklerle birlikte üç ve üçün katı olan harmonikler de elimine edilmektedir. Eviricinin bir çıkış periyodunda aynı oranda anahtarlama yapılarak kısmi kare dalga yöntemine göre daha az harmonik içeriğe sahip bir dalga şekli üretilmektedir. Önerilen yöntemde çıkış geriliminin genlik kontrolü değişken doğru akım (DA) baralı evirici vasıtasıyla yapılmaktadır. Önerilen yöntemin ve kısmi kare dalga yönteminin Matlab/Simulink'te modelleri kurulmuş, aynı şartlarda ve değişik çıkış frekanslarında R-L yükü, açık çevrim V/f kontrollü endüktif yük ve tek-fazlı asenkron motor için karşılaştırmalı olarak benzetim sonuçları verilmiştir. Önerilen yöntemin üstünlüğü dalga şekilleri ve harmonik spektrumları ile gösterilmiştir.

Anahtar Kelimeler:

Tek fazlı evirici, kısmi kare dalga, tek-darbe modülasyonu, THD

A NEW APPROACH FOR HARMONIC ELIMINATION IN SINGLE-PULSE MODULATED SINGLE-PHASE INVERTER DRIVE SYSTEM

In this paper, a novel control technique which is a particular implementation of the quasi square wave method has been proposed for a single-phase inverter drive. With the proposed control technique, 3rd and 3rd order harmonics together with even harmonics of the inverter output voltage waveform are eliminated as in a six-step inverter. An output voltage waveform with less harmonic content for one output period of the inverter operation is produced using the same switching rate as that of quasi square wave method. Output voltage control is performed by using a variable DC link inverter. Matlab/Simulink models of the proposed system, and the inverter system with quasi square wave modulation technique have been obtained. The comparative simulation results for both techniques are given at various output frequencies. Open-loop V/f control has been applied to both inverters feeding an R-L load, V/f controlled inductive and single-phase induction motor loads. Superiority of the proposed technique to the conventional quasi square wave modulation technique has been shown with the output waveforms and their spectra.

Keywords:

Single-phase inverter, quasi square wave, single-pulse modulation, total harmonic distortion (THD),

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