Patent ID: 8014964
Filing Date: 2011-09-06
Classification: G01R

Abstract:
1. An electrical power and energy measurement method for decomposing the total instantaneous power into instantaneous as well as average active and non-active power components using voltages and currents measured at the metering point and in doing so providing capability for measuring power and energy, measuring and determining information for compensating unwanted quantities, detecting source of distortion and indicating power quality, comprising: determining current Fourier components using the currents(s) measured at the metering point; determining voltage Fourier components using the voltage(s) measured at the metering point; detecting source generated dc, fundamental and/or harmonic current and voltage components, for each of the said current Fourier components; and for each of the said voltage Fourier components; detecting load generated dc, fundamental and/or harmonic current and voltage components, for each of the said current Fourier components; and for each of the said voltage Fourier components; decomposing the said current Fourier components into active and non-active parts; determining active current components comprising both source generated and load generated, for each of the said detected load generated dc, fundamental and/or harmonic current components, using the said decomposition of current Fourier components into active and non-active parts; determining non-active current components comprising both source generated and load generated, for each of the said detected load generated dc, fundamental and/or harmonic current components, using the said decomposition of current Fourier components into active and non-active parts; determining instantaneous active power components comprising both source generated and load generated, using the said active current components comprising both source generated and load generated, and the said voltage Fourier components; determining instantaneous active power, using the said instantaneous active power components comprising both source generated and load generated; determining instantaneous non-active power components comprising both source generated and load generated, using the said non-active current components comprising both source generated and load generated, and using the said voltage Fourier components; determining instantaneous non-active power, using the said instantaneous non-active power components comprising both source generated and load generated; determining average active power components comprising both source generated and load generated, using the said instantaneous active power components comprising both source generated and load generated; determining average active power, using the said instantaneous active power; determining average non-active power components comprising both source generated and load generated, using the said instantaneous non-active power components comprising both source generated and load generated; determining average non-active power, using the said instantaneous non-active power; determining average total power components comprising both source generated and load generated, using the said average non-active power components comprising both source generated and load generated, and using the said average active power components comprising both source generated and load generated; determining average total power, using the said average non-active power, and using the said average active power; measurement of time duration for energy computation; determining active energy transfer, using the said measured time duration for energy computation, and using the said average active power; determining non-active energy transfer, using the said measured time duration for energy computation, and using the said average non-active power; determining single-phase instantaneous active power for each of the three phases; determining single-phase instantaneous non-active power for each of the three phases; determining three-phase instantaneous positive active power, using the said single-phase instantaneous active power for each of the three phases; determining three-phase instantaneous negative active power, using the said single-phase instantaneous active power for each of the three phases; determining three-phase instantaneous positive non-active power, using the said single-phase instantaneous non-active power for each of the three phases; determining three-phase instantaneous negative non-active power, using the said single-phase instantaneous non-active power for each of the three phases; determining three-phase average positive active power, using the said three-phase instantaneous positive active power; determining three-phase average negative active power, using the said three-phase instantaneous negative active power; determining three-phase average active power, using the said three-phase average negative active power, and using the said three-phase average positive active power; determining three-phase average non-active power, using the said three-phase instantaneous positive non-active power; determining three-phase average total power, using the said three-phase average non-active power, and using the said three-phase average active power; determining three-phase active energy transfer, using the said three-phase average active power, and using the said measured time duration for energy computation; determining three-phase non-active energy transfer, using the said three-phase average non-active power, and using the said measured time duration for energy computation.