Alternating current voltage and current multiplexing acquisition method and system free of secondary calibration

Abstract

The invention provides an AC voltage and current multiplexing acquisition method and system free of secondary calibration. Multiplexing of voltage and current signal acquisition channels is achieved by replacing a mutual inductor wiring board, an active mode formed by an operational amplifier is adopted in an alternating current signal acquisition channel I / V conversion circuit, a sampling resistor is a unique value, and voltage and current signals are not distinguished; the voltage transformer and the current transformer adopt 0.05-level current types, secondary current parameters are consistent, the acquired voltage and current signals are all mapped to a range of 0-1; an original signal value can be obtained through conversion by multiplying the signal type of the channel by the corresponding full code value; when the signal type of the channel is changed, the full code value of the corresponding channel is changed through parameter setting, secondary calibration is not needed, high-precision acquisition of parameters such as line voltage, current, active power and reactive power is realized, and the operation and maintenance cost of field equipment is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of power distribution automation, in particular to an AC voltage and current multiplexing acquisition method and system without secondary calibration. Background technique [0002] As an indispensable part of the power distribution automation SCADA system, the power distribution terminal is one of its basic functions to collect the voltage and current data of the power grid and calculate the active power and reactive power of the power grid based on the collected voltage and current data. , apparent power and power factor and other parameters. With the increase of electricity load brought about by economic development and the upgrading and transformation of field equipment, the change of field wiring method inevitably leads to the change of the voltage and current signal types connected to the signal acquisition channel of the power distribution terminal. The voltage signal needs to be connected to the curr...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and system for AC voltage and current multiplexing acquisition without secondary calibration, aiming at solving the problem of power distribution terminal signal in the prior art The problem of wasting manpower and material resources when the signal type of the acquisition channel voltage and current is changed, so that no secondary calibration is required, the acquisition accuracy is improved, and the operation and maintenance cost of field equipment is reduced

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