Recent surveys of 208 / 120 V three-phase four-wire electric systems, buildings, and industrial plants with computers and nonlinear loads show excessive currents in the neutral. These neutral currents are fundamentally third harmonic, and their presence is tied to wiring failures, elevating of neutral potentials, transformer overheating, etc.In response to these concerns, this paper proposes a new active power filter scheme to cancel neutral current harmonics.
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