Abstract：Dynamic voltage restorer (DVR) is one of important power quality control equipment. It can compensate voltage sag accurately and quickly. The key point of compensation is quick detection of voltage sag and accurate generation of correct reference wave. It is proved that the magnitude and phase of the base wave component of a sample sequence of a periodical signal can be extracted through a kind of weight average, and therefore the base wave can be reconstructed through scalar product. A novel reference wave generating algorithm based on above theory is proposed in this paper. The proposed algorithm can be easily implemented in digital system. The experimental results show that the reference wave is unacted on parameters variety. And the proposed algorithm can detect voltage quickly.
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2009, Vol. 24 
