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In this paper, indirect control theory is proposed for a 4-leg shunt active power filter (SAPF) to compensate reactive power and balance the load currents. The control for the fourth leg is made different from the other authors by using 0 as the neutral current reference. All simulations performed by using Matlab-Simulink show the effectiveness of the proposed solution.
In this note, we construct a 3-D solution to the heat equation by means of the Fourier sine transform. If there exists no source of heat and the initial inner temperature of the body is zero our solution depends on x, y, z and t only by the similarity variables _ , _ and _ . Moreover, the corresponding 2-D and 1-D solutions appear as limiting cases for _ or _ and _ .
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