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This paper presents a harmonic suppression control strategy under unbalanced point of common coupling (PCC) voltage for modular multilevel converter based shunt active power filter (MMC-SAPF). Harmonics are extracted by multiple synchronous reference frame (MSRF) algorithm to generate the compensation current references of positive- and negative-sequence control for MMC-SAPF. The proposed independent...
Three-phase three-wire shunt active power filter (SAPF) with traditional positive-sequence control can only compensate part of the nonlinear load current harmonics if the PCC voltage changes from balanced to unbalanced condition. Changes of both nonlinear load current harmonic components and equivalent circuit for modular multilevel converter based SAPF (MMC-SAPF) are analyzed in the paper. To solve...
Shunt active power filter (SAPF) is conventionally designed to compensate harmonic currents from non-linear load. However, due to parallel resonance between line impedance and capacitive load, the distortion of the voltage at point of common coupling (PCC) and grid current may not be mitigated completely by traditional manner of SAPF. This paper investigates harmonic compensation and resonance damping...
In this paper, the harmonic compensation characteristics of APFs to nonlinear loads are investigated by a circuit equivalent method based on impedance analysis. It is found that the ac-side harmonic current of voltage source type nonlinear load (VSNL) will be amplified seriously when it is compensated by shunt APF, and the ac-side harmonic voltage of current source type nonlinear load (CSNL) will...
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