Low-voltage distribution network topology identification method and system based on mutual information

A technology of low-voltage distribution network and identification method, applied in transmission systems, digital transmission systems, electrical components, etc., can solve the problems of frequent update of distribution network, difficulty in realizing topology identification of distribution network, and complicated wiring, etc. Difficulty in topology identification, improved stability, and the effect of reducing dependencies

Pending Publication Date: 2020-09-11
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +3
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Problems solved by technology

[0004] Problems in the existing research: most of the research on power system topology is limited to the identification of transmission network topology errors and the detection of topology changes. However, the current distribution network is frequently updated and the wiring is complex. With the development of smart grids, Massive data in each link of the distribution network makes it difficult to realize the topology identification of the distribution network

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  • Low-voltage distribution network topology identification method and system based on mutual information
  • Low-voltage distribution network topology identification method and system based on mutual information
  • Low-voltage distribution network topology identification method and system based on mutual information

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Embodiment 1

[0048] This embodiment provides a low-voltage distribution network topology identification method based on mutual information, the steps of which are as follows:

[0049] Step (1): Collect the time series voltage amplitude information data V={V 1 ,...,V i ,...,VN}(500-1000 time sections) as the input to identify the topology of the low-voltage distribution station area, N represents the number of users under the meter, V i Represents the voltage vector under a user, the length of the vector is determined by the number of collections, and the collected data are all under the same distribution station area;

[0050] The obtained data will have missing values, repeated values, etc., and data preprocessing is required before use. Data preprocessing usually varies for different tasks and dataset properties. Common processes for data preprocessing are: removing unique attributes, dealing with missing values, attribute encoding, data standardization and regularization, feature sel...

Embodiment 2

[0085] This embodiment provides a low-voltage distribution network topology identification system based on mutual information, which includes:

[0086] Data acquisition module: collect the time series voltage amplitude information data V={V 1 ,...,V i ,...,V N} As the input to identify the topology of the low-voltage distribution station area, N represents the number of users under the meter, V i Represents the voltage vector under a user, the length of the voltage vector is determined by the number of collections, and the collected data are all under the same distribution station area;

[0087] Data preprocessing module: preprocess the time series voltage amplitude information data of users' smart meters in the low-voltage distribution station area, fill in missing values ​​and delete abnormal data, and abnormal data are outliers;

[0088] Mutual information calculation module: According to the definition of information entropy, the calculation formula of mutual informatio...

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Abstract

The invention discloses a low-voltage power distribution network topology identification method and system based on mutual information. According to the technical scheme, the low-voltage power distribution network topology identification method comprises the following steps of: firstly, time sequence voltage amplitude information data of intelligent electric meters of users in a power distribution area are input, then the data are preprocessed, then mutual information among the users is calculated in sequence through a mutual information calculation formula and stored in a user mutual information set, and finally topology recognition of the low-voltage power distribution area is completed through a maximum weighted spanning tree algorithm. According to the method, the problem that the topology identification difficulty is remarkably increased due to frequent change of network topology caused by large-scale grid connection of high-proportion renewable energy sources can be effectivelysolved, dependence on a physical model of a power system is reduced, and calculation and optimization of the power system are further performed, so that the stability of the power system is improved.

Description

technical field [0001] The invention belongs to the field of distribution network topology identification, and relates to a low-voltage distribution network topology identification method and system based on mutual information. Background technique [0002] With the development of technology, intelligent monitoring equipment has been able to accurately monitor the information of high-voltage and medium-voltage power grids. Unauthorized modification of lines and other issues, the phase information on the user side of the three-phase low-voltage distribution network is often incomplete or wrong. The topology recognition technology of distribution network can update the change of switch state and form a new topology structure, which provides necessary information for advanced applications in distribution network management system, such as state estimation, fault diagnosis, power flow calculation, reactive power optimization, power grid reconfiguration, etc. network structure d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/24
CPCH04L41/12
Inventor 邵先军童力赵健江航周金辉陈蕾张海鹏王凯王子凌陈超赵启承
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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