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VERIFICATION OF THE MATHEMATICAL EXPRESSIONS FOR THE EFFICIENCY AND POWER OF THREE-PHASE FOUR-WIRE POWER SYSTEM WITH SHUNT ACTIVE FILTER

S.Yo. Polishchuk
Institute of Electrodynamics of the National Academy of Sciences of Ukraine,
Peremohy, 56, Kyiv-57, 03680, Ukraine,
e-mail: polischuk@ied.org.ua

Approximative formula for determining power factor of the load has been proposed for non-sinusoidal unbalanced mode of three-phase four-wire power system. It takes into account the ratio of active resistance of the phase wires to the resistance of the neutral wire. The adequacy of the proposed ratios has been shown by the example of calculating efficiency of three-phase four-wire power system for a simple unbalanced load. References 7, figures 3.
Key words: efficiency, power factor, shunt active power filter.