Power compensation optimizing method used in electric energy meter replacement in live working state based on least square method curve fitting

Abstract

Provided is a power compensation optimizing method used in electric energy meter replacement in a live working state based on least square method curve fitting. The method comprises the following steps of: connecting the voltage wire of a three-phase electric energy meter field calibrator with a loop in parallel and connecting the current wire of the three-phase electric energy meter field calibrator with the loop in series before an electric energy meter is replaced; when the electric energy meter is replaced, reliably connecting the secondary current test terminals of the replaced electric energy meter in a short circuit manner and measuring a current value by using a clamp ammeter in order to determine whether reliable short-circuit connection is achieved, starting a stopwatch to record replacing time; acquiring active power discrete points p(tn) within a time segment from t1 to t2 by using the three-phase electric energy meter field calibrator when replacement begins, acquiring a power curve function p(t) by using a least square method curve fitting method according to discrete point sampling values, and computing total active power lost in a meter replacing process by using a relation between power and time. The method improves the accuracy of metering results and guarantees the economic interests of a power seller and a power buyer.

Description

technical field [0001] The patent of the present invention belongs to the technical field of electric energy metering, and more specifically, it relates to an optimization method for supplementing electric energy of electric energy meters with live replacement based on least square curve fitting. Background technique [0002] The replacement of the electric energy meter at the gate is a relatively frequent on-site work performed by the electric energy metering professionals in the metering center. In order to ensure that the normal power production and operation are not affected, the renewal and transformation of the electric energy metering device at the gate is carried out by online replacement, which involves the disassembly and assembly of the gate. During this period of time, the energy meter will generate power loss, and the power loss during the meter replacement period must be compensated accordingly to ensure the economic benefits of the operating unit. However, in ...

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Problems solved by technology

[0003] However, in the replacement of the on-site gateway meter, it is found that the above-mentioned scheme will have a large error when the load changes greatly, and it is not the most ideal power compensation method.

Since it is impossible to accurately measure the electricity during this period, it can only be measured and calculated manually, and there are large errors. Therefore, many electricity customers do not recognize the calculated supplementary electricity, which affects power companies and enterprises. Reasonable and fair electricity transaction for electricity customers

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