Symmetrization of asymmetrical three-phase load supplied from non-ideal periodic non-sinusoidal voltage source using simplified structure of the compensator

Purpose - The problems presented in the paper concern a three-phase four-wire system with periodical non-sinusoidal voltage sources with inner impedances and asymmetrical linear three-phase loads. Generally, the line currents of the system are asymmetrical. The purpose of the paper is to improve the working conditions of the system by means of symmetrization. Design/methodology/approach - A method of symmetrization of these systems has been proposed. In this paper, the symmetrization problem has been solved by using the symmetrical components theory and compensation of reactive power for each of voltage harmonics under consideration. Findings - After symmetrization currents become symmetrical and their RMS values and active power on source impedances become lower. The realization of symmetrization makes possible: reduction of RMS values of source currents, an assurance of equal loads for individual phases of the system supplied from sources with inner impedances, after symmetrization the voltage source generates and load consumes greater useful active power. Originality/value - The simplified structure of the compensator has been proposed in the paper. The symmetrization has been presented with referenced to new structure of the compensator.