Low-voltage user loop impedance binary linear model construction and solving method

Abstract

The invention discloses a low-voltage user loop impedance binary linear model construction and solving method. The method belongs to the technical field of power management, and comprises the following steps: collecting time series data of voltage, current and power factors acquired by a user intelligent electric meter, deducing and constructing a binary linear model of low-voltage user loop impedance by utilizing a KVL loop voltage phasor equation on the basis of a low-voltage distribution network circuit model; in a loop impedance solving process, firstly, selecting a data acquisition time period on the basis of statistical division of peak and valley usual periods of the region, observing the current step moment of a user at an interval of 5 min in the time period, and freezing voltageand current data of the two moments before and after the step moment; and then performing linear regression analysis by taking multi-day data as samples, performing sample cleaning and multiple iterations according to residual analysis of regression results, accurately calculating user loop impedance, and using the loop impedance numerical value for estimating and judging the health aging degree of the low-voltage distribution network line and the abnormal power consumption behavior of a user.

Description

Technical field [0001] The invention belongs to the technical field of power management, and in particular relates to a method for constructing and solving a binary linear model of low-voltage user loop impedance. 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, the aging line may be disconnected, and the insulation performance of the aging line is more likely to cause leakage or short circuit. However, the low-voltage distribution network has complicated lines and small fault impact. Considering the input-output ratio and other reasons, in the operation and management of low-voltage distribution network, the distribution network power flow is rarely calculated. An important indicator of low-voltage distribution network operation is "line loss". "It is also mainly calculated by the method of power balance, so the calculation involving the impedan...

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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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