Abstract
In the case of balanced and undistorted supply voltages, shunt APFs can achieve current harmonic cancellation and give unity power factors. However, this is not possible when grid voltage is non-sinusoidal and unbalanced. In this paper, we first show that the harmonic suppression performance of the well-known p-q theory deteriorates in non-ideal grid voltage conditions. A technique for alleviating the detrimental effects of a distorted and unbalanced grid voltage is proposed that uses a self-tuning filter with p-q theory. The proposed control technique gives an adequate compensating current reference even for non ideal voltage condition. The results of simulation study are presented to verify the effectiveness of the proposed control technique in this study.DOI: http://dx.doi.org/10.5755/j01.eee.19.1.3247
Highlights
Harmonic distortion has become a major power quality problem in recent years
We propose the use of a self-tuning filter (STF) with the instantaneous reactive power theory in order to increase the harmonic suppression efficiency of active power filter in the case of non-ideal grid voltage condition
The STF can be used as a simple but effective method of suppressing the effects of a non-ideal source, which allows for improved harmonic compensation by the active power filter (APF)
Summary
The main reason is the increasing use of nonlinear loads such as adjustable speed drives, power supplies and soft-starters These nonlinear loads draw non sinusoidal currents from the utility and cause a type of voltage and current distortion, namely harmonics [1]. The use of an active power filter (APF) to mitigate harmonic problems has drawn much attention since the 1970s, because they have excellent compensation characteristics. We propose the use of a self-tuning filter (STF) with the instantaneous reactive power theory in order to increase the harmonic suppression efficiency of active power filter in the case of non-ideal grid voltage condition
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