Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Keywords: Active Harmonic Filters, distributed compensation, Harmonics, power factor, Power Factor Correction

Abstract

This work present the development of an electronically controlled harmonic mitigation device with the property that it can inserts specific series harmonic impedances in the electric system. These harmonic impedances are inserted only at specific frequency (or frequencies) and can be utilized, for example, to active detune power factor capacitor banks limiting the harmonic current through the capacitors without need for capacitor voltage rating increase as it does not significantly change the fundamental voltage at the capacitors. Also the system can be used for implementation of shunt hybrid harmonic filters and in distributed harmonic mitigation strategies, obtaining a flexible and cost-effective solution even for high power applications. Other advantage of the proposed system is the reduced converter rating necessary for the selective harmonic impedance implementation. The utilization of single turn secondary coaxial transformers, where the secondary side is composed only by the power system cable, for harmonic impedance coupling, gives a significant flexibility to its application, allowing an easy evaluation of application in existing systems, minimizing the downtime for solution implementation and performance evaluation.

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