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

A low-voltage loop and loop impedance technology, applied in the direction of measuring resistance/reactance/impedance, measuring devices, instruments, etc., can solve problems such as disconnection, insulation performance degradation, and complicated lines of low-voltage distribution network, so as to improve economic benefits and strengthen The effect of electricity management

Active Publication Date: 2019-04-12
JIANGSU INTELEVER ENERGY TECH CO LTD
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AI Technical Summary

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

Method used

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

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Experimental program
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Embodiment 1

[0094] Step 1: Determination of the data collection period: select the data collection period, combine the division of the peak and valley periods in the area and the statistics of user electricity consumption in this season, and select the peak period and peace period with relatively stable electricity consumption; image 3 As shown, it is the division of peak-valley and normal periods for the implementation of peak-valley electricity prices in Anhui. The division of time periods is based on historical statistical data and reflects the distribution of social loads. The flat intersection is the target data collection period.

[0095] Step 2: Determine the current step ratio value I Co： User current step comparison value I Co To determine the user’s recent historical load curve, extract the current step sequence I(k) of the user, and determine the current step ratio value I of the user based on the step that covers 50% of the user Co ; In the calculation example, there are ma...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/08
CPCG01R27/08
Inventor 邓士伟傅萌苗青黄莉冯燕钧何朝伟
Owner JIANGSU INTELEVER ENERGY TECH CO LTD
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