Of the main effective and simple techniques is the third harmonic Introduced in literatures to reduce harmonic contents in theseĬonverters which have been reviewed in many papers. Harmonic contents with total harmonic distortion (THD) more thanģ3% which is greater than the allowable limits specified in most of Of three-phase controlled/uncontrolled converters have high , as rectifier in elect ric furnaces and so on. , interconnecting renewable energy system with electric utility Rectifier/inverter in many applications like adjustable speed drives Three-phase controlled/uncontrolled converters can be used as a Mathematical, simulation,Īnd experimental results for these two schemes have been introduced, compared, and discussed. Two lab prototypes for these two schemes have been implemented. Injection path at minimum THD and the corresponding efficiency of each scheme. The mathematical analysis introduces the optimum values for components on the harmonic A novel mathematical analysis for the proposed scheme and state-ofthe-art scheme is introduced. With the state-of-the-art system using zigzag transformer. This scheme is used with threeīidirectional switches as harmonic injection device to circulate the injection current to supply currents. That can be controlled by single-phase controlled and boost converters, respectively. Minimum THD for any firing angle of controlled converter is function in phase-angle and amplitude of harmonic injection current Injecting third harmonics current from dc-bus to the line current reduces its harmonic contents. Efficient current injection device for harmonicĮnergy Technologies Center, King Saud University, Riyadh 11421, Saudi ArabiaĮngineering Department, Mansoura University, Mansoura, EgyptĮ-mail: Third harmonic current injection technique is one of the best options for harmonic reduction of three-phase controlled/
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