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Mutual information-based topology estimation method and system for low-voltage distribution network users

A low-voltage distribution network and mutual information technology, applied in the field of electric power, can solve problems such as potential safety hazards, low efficiency, troublesome field test wiring, etc., and achieve the effect of increasing the speed

Active Publication Date: 2019-01-25
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the method (1) is simple and easy to implement, there is a transmission dead zone, which is greatly affected by the load of the distribution station area; the field test wiring of the method (2) is cumbersome, the efficiency is low, and there are certain safety hazards

Method used

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  • Mutual information-based topology estimation method and system for low-voltage distribution network users
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  • Mutual information-based topology estimation method and system for low-voltage distribution network users

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Embodiment 1

[0027] A user topology estimation method for low-voltage distribution network based on mutual information, such as figure 1 As shown, it mainly includes the following steps:

[0028] Step S1, acquiring user voltage time series data and transformer voltage time series data;

[0029] In step S1, the measurement data is automatically collected from the smart meter, and the user voltage time series is read regularly. With the extensive use of smart meters in the distribution network, the power company can obtain the real-time voltage situation of users in time, which provides convenience for obtaining the required time series data of user voltage.

[0030] As an optional implementation of this embodiment, such as figure 2 As shown, step S1 specifically includes:

[0031] Step S11, collecting user voltage data and transformer voltage data;

[0032] Step S12, preprocessing the user voltage data and transformer voltage data to obtain user voltage time series data and transforme...

Embodiment 2

[0071] A low-voltage distribution network user topology estimation system based on mutual information, such as Figure 5 As shown, it mainly includes: data acquisition module 6, used to obtain user voltage time series data and transformer voltage time series data; calculation module 7, used to calculate the relationship between user voltages according to user voltage time series data and transformer voltage time series data Mutual information and the mutual information between the user and the transformer; the phase identification module 8 is used to perform user phase identification by means of the K-means clustering algorithm according to the mutual information between the user and the transformer; the model building module 9 is used to construct a topology model; The topology estimation module 10 is configured to use the minimum spanning tree algorithm to complete the topology estimation according to the magnitude of the mutual information between the voltages of the users a...

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Abstract

The invention discloses a low-voltage distribution network user topology estimation method and system based on mutual information, wherein, the method comprises the following steps: step S1, obtaininguser voltage time series data and transformer voltage time series data; step S2, obtaining user voltage time series data and transformer voltage time series data. 2, calculate mutual information between user voltage and mutual information between user and transformer accord to time series data of user voltage and time series data of transformer voltage; Step S3, according to the mutual information between the user and the transformer, the user phase identification is carried out according to the K-means clustering algorithm; 4, construct a topology model; Step S5, the topology estimation is completed according to the mutual information between the user voltages by using the minimum spanning tree algorithm for the user after the phase identification. Compared with the prior art, the invention does not rely on the known topology, does not need additional carrier wave, is not affected by the load of the distribution station area, has no field test wiring problem, does not exist securityhidden trouble, and improves the speed of topology estimation.

Description

technical field [0001] The invention relates to a method and system for estimating user topology of a low-voltage distribution network based on mutual information, and belongs to the field of electric power technology. Background technique [0002] The distribution network refers to the low-voltage portion that transports electricity from substations to loads. The phase information on the user side of the low-voltage distribution network is often incomplete or lost. Phase connection information at the user level allows modification to meet certain conditions, such as rebalancing three-phase distribution transformers and feeders, to reduce system losses and reduce voltage unbalance factors. Unbalanced feeders have higher losses and voltage drops. Additional copper losses will shorten the life of grid assets such as transformers. And three-phase balancing will allow higher levels of rooftop PV to be incorporated into distribution grid customers. Accurate phase identificati...

Claims

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Application Information

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IPC IPC(8): H02J3/00
CPCH02J3/00H02J2203/20
Inventor 汪晋宽刘磊赵强韩英华
Owner 东北大学秦皇岛分校
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