unity power factor


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unity power factor

[′yü·nəd·ē ′pau̇·ər ‚fak·tər]
(electricity)
Power factor of 1.0, obtained when current and voltage are in phase, as in a circuit containing only resistance or in a reactive circuit at resonance.
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Keywords: Plug-in Electric Vehicles, bi-directional power flow, PWM AC-DC converter, PWM DC-DC buck-boost converter, Vehicle to Grid, Predictive Current Control, Phase Lock Loop, band-stop filter, Total Harmonic Distortion, unity power factor
Results show that the input current corresponding to the proposed configuration has an almost unity power factor.
Reactive Power Compensation--Alternatively, the kVA ratings saved due to the unity power factor operation can be used to provide reactive power compensation to the utility system.
It can be observed that the grid current is in phase with the grid voltage (phase-to-ground) at the steady state and during dynamic process, which ensures a unity power factor at the source side.
This unit provides a sinusoidal output at near unity power factor, specifically designed for use with LED fittings.
With correction to near unity power factor and more than 95 prevent efficiency (depending on line and load), this circuit can be easily incorporated into products or serve as an experimental springboard for circuits.
Two keys to this higher availability system are a compatible UPS with linear soft start and unity power factor sine wave loading from no load to full load, and phase lock synchronizing of the engine generator or generators.
Inverter currents will vary from 170A at unity power factor (the difference in phase between the phase voltage and phase current) to 195A at 0.
Many PWM drives use a choke in the DC bus to further filter harmonic noise generated onto the incoming line and maintain a near unity power factor.
Mitsubishi Electric's 9900B UPS offers the most efficient, on-line double conversion in the industry at all load levels, with up to 97 percent efficiency at unity power factor," said Dean Datre, general manager, Mitsubishi Electric Power Products UPS division.

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