A three-phase back-to-back converter for reactive power compensation, current harmonic filtering and active power compensation

This paper presents how a three-phase BTB converter is actively controlled to operate as a power compensator and a harmonic current filter, simultaneously. The main goal of the proposed control scheme is to analyze the current injected by the BTB converter at the PCC using three components. These components are used to compensate: the active power, the reactive power and the current harmonics. The current components of nonlinear loads are obtained and incorporated to the current controllers in order to achieve the filtering function. For the analysis, the active power compensation is a priority and it is accomplished. A 30 kVA BTB converter is used for simulations. Experimental tests were carried out with a 3 kVA prototype.