Summary
Recently, both utilities and consumers have paid great attention to voltage fluctuation (flicker) problem, which is defined as low‐frequency fluctuation on the base signal of voltage. For mitigating the flicker, identification of its source is the first step. In this paper, a new method is proposed for identifying the location of flicker sources in a multi‐flicker sources power network in a more reliable and precise manner by a minimum number of monitoring points. This method is based on the wavelet transform (WT), the approximate model of the line and flicker power theory. In addition, in this method, a new factor is proposed for determining the contributions of individual consumers and utility providers in the global flicker level of a common coupling bus‐bar. For validating the performance of the proposed method, comprehensive simulations have been performed in MATLAB environment on a single‐ and multi‐flicker sources system based on IEEE 34 node test feeder. As proved by the results, the proposed method is able to identify the contributions and locations of flicker sources with higher reliability and accuracy compared with other methods.
SUMMARY
In recent years, rising non‐linear loads and distributed generation sources have made voltage fluctuation one of the main quality problems in power systems. To deal with this problem, new methods should be developed that can identify all flicker sources and calculate the exact contribution of each flicker source from the total voltage flicker of the network. A method with fewer measurement points is more desirable because of the less monitoring time required and cost. In this article, a new method based on wavelet transform is proposed, which can not only detect the exact location of the flicker sources but also precisely determine the contribution of each flicker source from the overall flicker value and the voltage and current flicker signals of these sources. In contrast to the previously proposed methods, which can provide only one of the mentioned pieces of information, that is, the flicker source location, the proposed method can simultaneously calculate all three of them with fewer monitoring points. The proposed method was completely simulated in MATLAB/Simulink on single‐ and multi‐flicker source systems based on an IEEE 34‐node test feeder to evaluate the method's performance.
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