Various modern loads have a nonlinear character giving rise to non-sinusoidal currents circulating on the AC network. These non-sinusoidal currents produce some drawbacks reducing the power quality of the mains. To solve this problem several measures can be adopted. Active filters are being extensively studied in the last years to become a credible solution. This paper presents a new method for detecting the reference components that should be injected on the mains to compensate nonlinear loads. This method is based on an extension of the reactive power concept to non-sinusoidal conditions defined by George Darrieus is 1970. In comparison with the well-known pq method introduced by Akagi et all, this method presents better performances, producing less harmonics on the mains. To illustrate the performances of the method proposed, a comparison between these two methods is presented in this paper.
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