Method and device for judging starting state and shunt running state in electric energy metering

Abstract

The invention discloses a method and a device for judging a starting state and a shunt running state in electric energy metering. According to the method and the device, an instantaneous power and a shunt running threshold power are calculated by multiplying a voltage value by a current value and the instantaneous power and the shunt running threshold power are respectively subjected to integration calculation; and then the power values are respectively compared with a pre-set threshold energy value to judge the starting state and the shunt running state of the electric energy metering. According to the method and the device, relative operation of multiplying the voltage value by the current value is adopted and a result of the integration calculation is used as a judging evidence to carry out judgment on the starting state and the shunt running state, so that the influences (caused by the noises) on the starting sate and the shunt running state can be reduced; and meanwhile, an integrator is used for calculating judgment evidences of the starting state and the shunt running state, namely the judgment of the starting state and the shunt running state can be carried out by using operation method of energy accumulation with low cost.

Description

technical field [0001] The invention relates to the technical field of digital signal processing, in particular to a method and device for judging the start-up creep state in electric energy metering. Background technique [0002] The application of electric energy metering is to obtain the electric energy power value by multiplying the measured voltage signal value by the current signal value, and integrate this power value according to time to obtain electric energy energy as the electric energy metering result. The speed of electric energy accumulation, or the average power over a period of time, can be characterized by the frequency of a pulse signal CF. The usual method is to integrate the instantaneous power P at a fixed time interval, and store the integration result in E. When the accumulated energy in E is greater than a threshold value E th When , we say that an overflow occurs, at this time, a CF signal should occur, and subtract E from E at the same time th , E...

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Problems solved by technology

[0006] In order to overcome the disadvantages of misjudgment of the start-up creep state in the prior art in the power consumption environment with high noise or low fundamental wave content and high harmonic content, the present invention provides a start-up creep state detection method in electric energy metering. The determination method and device can reduce the influence of noise on the determination of the starting creep state by using the cross-correlation calculation result of multiplying the voltage and current to determine the starting creep state; , that is, using the energy accumulation method, the determination of the start-up creep state is realized at a small cost

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