A Study on Power Quality Improvement in PWM Controlled AC Voltage Controller

Yıl 2008, Cilt: 12 Sayı: 1, 58 - 64, 09.04.2009

Ahmet Altıntaş

Öz

A lot of topologies of pulse-width modulated (PWM)-AC controllers for single-phase and three-phase systems are proposed up to date. PWM-AC controllers have important advantages compared with the phase-controlled AC controllers using thyristors and triacs. The PWM-AC controller has sinusoidal current waveforms, smaller THD values, better power factor, faster dynamics, and smaller input/output filter. This article presents a novel control technique for application to PWM-AC controllers with ability of generating fewer harmonics. In the proposed control method, both the traditional AC voltage controllers and the PWM-AC controllers are combined; and smaller THD values are obtained. Thus, the harmonic pollution in the power system will be reduced; and consequently, the power quality will be increased. For this purpose, computer simulations are performed in order to investigate the proposed controller performance. The obtained results are compared with the conventional PWM-AC controller.

Anahtar Kelimeler

Güç kalitesi, Harmonikler, AC kontrolcü, PWM-AC kontrolcü

Kaynakça

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