A new stationary frame control scheme for threephase pulsewidth-modulation (PWM) rectifiers operating under unbalanced voltage dips conditions is proposed in this paper. The proposed control scheme regulates the instantaneous active power at the converter poles to minimize the harmonics of the input currents and the output voltage ripple. This paper's novelty is the development of a new current-reference generator implemented directly in stationary reference frame. This allows using proportional sinusoidal signal integrator (P-SSI) controllers for simultaneous compensation of both positive and negative current sequence components. No phase-locked loop (PLL) strategies and coordinate transformations are needed for the proposed currentreference generator. Experimental results are presented for a 20-kVA alternative current (ac)/direct current (dc) converter prototype to demonstrate the effectiveness of the proposed control scheme. A comparison with two other existing control techniques is also performed. Fast dynamic performance with small dc-link voltage ripple and input sinusoidal currents are obtained with this control scheme, even under severe voltage dips operating conditions.Index Terms-AC/DC converter, current-reference generator, voltage dips.

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This paper presents a frequency response analysis of current controllers based on selective harmonic compensation schemes for three-phase voltage-source shunt Active Power Filters (APFs). To perform this analysis, the time delay introduced by the inverter and the sampling is taken into account in the current controller closed loop transfer function. Doing this, the differences among the schemes are pointed out, demonstrating the importance and effectiveness of the delay compensation to maintain the whole system stability. In addition, the performance of each current controller is evaluated by means of the total harmonic distortion of the mains line current and time response for fast load variations. The main goal is to identify the most suitable solution in terms of current controllers based on selective harmonic compensation for an industrial implementation. All the considered current control schemes have been tested on the same digital platform. Experimental results are presented for a 25-kVA shunt APF prototype compensating a nonlinear inductive load. 

A new stationary frame control scheme for threephase pulsewidth-modulation (PWM) rectifiers operating under unbalanced voltage dips conditions is proposed in this paper. The proposed control scheme regulates the instantaneous active power at the converter poles to minimize the harmonics of the input currents and the output voltage ripple. This paper's novelty is the development of a new current-reference generator implemented directly in stationary reference frame. This allows using proportional sinusoidal signal integrator (P-SSI) controllers for simultaneous compensation of both positive and negative current sequence components. No phase-locked loop (PLL) strategies and coordinate transformations are needed for the proposed currentreference generator. Experimental results are presented for a 20-kVA alternative current (ac)/direct current (dc) converter prototype to demonstrate the effectiveness of the proposed control scheme. A comparison with two other existing control techniques is also performed. Fast dynamic performance with small dc-link voltage ripple and input sinusoidal currents are obtained with this control scheme, even under severe voltage dips operating conditions.

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