Abstract
A control method for improving the power quality in low voltage network contains mainly LED Light Sources with simple nonlinear switching power supply is described in this paper. This method implements active power factor correction and lowers the voltage and current extant harmonic distortion in the line. The novel element in the proposed structure is the upper harmonic controller that minimizes the amplitudes of the 3rd, 5th 7th, 9th, and the 11th upper harmonic component in the output voltage using Asynchronous Parallel Pattern Search Method in Frequency Domain. The proposed controller has been investigated by simulation in Matlab environment, and as a result, substantial improvement of the output voltage and current waveform could be achieved. The total harmonic distortion of the voltage and the current has also been radically reduced. This reduction helps to decrease the power loss in the phase conductor, and more radically in the neutral conductor of the transportation line. In the case of production the electric power from fossil sources, it decreases the greenhouse gas emission, what will also decrease the environmental and social-welfare effects of the climate change.
