Low-voltage user loop impedance estimation method based on unitary model

Abstract

The invention discloses a low-voltage user loop impedance estimation method based on a unitary model, and belongs to the technical field of electric management. The method is characterized by defininga user loop impedance ZL on the basis of time series data for acquiring voltage and current through a user intelligent electric meter, and deducing and building a unitary linear model of a low-voltage user loop impedance by utilizing a KVL loop voltage equation. The loop impedance estimation method comprises the steps of firstly selecting a data acquisition time interval on the basis of a peak valley ordinary time frame statistics division at the area, observing a current step moment of a user at an interval of 5min within the time frame, and freezing voltage-current data before and after thestep; and then adopting one-day data as a sample, carrying out linear-regression analysis, and estimating the user loop impedance ZL, wherein the loop impedance value can be used for estimating and judging a health ageing degree of a low-voltage distributing network circuit and a user abnormal power utilization behavior.

Description

technical field [0001] The invention belongs to the technical field of electric power management, and in particular relates to a method for estimating the impedance of a low-voltage user circuit based on a unitary model. Background technique [0002] With the increase of the service life of the line and the erosion of the external harsh natural environment, the line will gradually age. On the one hand, there is a possibility of disconnection in the aging line, and more often, after the aging of the wire, the insulation performance decreases, and leakage or short circuit is prone to occur. However, the lines of the low-voltage distribution network are complicated, and the impact of faults is small. Considering the input-output ratio and other reasons, in the operation and management of the low-voltage distribution network, the power flow of the distribution network is rarely calculated. An important indicator of the operation of the low-voltage distribution network is "line lo...

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Problems solved by technology

[0002] With the increase of the service life of the line and the erosion of the external harsh natural environment, the line will gradually age. On the one hand, there is a possibility of disconnection in the aging line, and more often, after the aging of the wire, the insulation performance will decline, and leakage or short circuit will easily occur.

However, the lines of the low-voltage distribution network are complicated, and the impact of faults is small. Considering the input-output ratio and other reasons, in the operation and management of the low-voltage distribution network, the power flow of the distribution network is rarely calculated. An important indicator of the operation of the low-voltage distribution network is "line loss". "It is also mainly calculated by the method of power difference, so the calculation involving the line impedance of the distribution network has always been a blind area of ​​research

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