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A Method of Distribution Network State Estimation Based on Network Decomposition

A network state and distribution network technology, applied in the field of estimation, can solve the problem that the weighted least square method cannot converge correctly

Active Publication Date: 2016-09-21
STATE GRID CORP OF CHINA +1
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Problems solved by technology

But for large-scale distribution networks, such as IEEE 123 distribution network standard calculation example, the classical weighted least squares method cannot converge correctly

Method used

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  • A Method of Distribution Network State Estimation Based on Network Decomposition
  • A Method of Distribution Network State Estimation Based on Network Decomposition
  • A Method of Distribution Network State Estimation Based on Network Decomposition

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Embodiment Construction

[0056] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0057] Such as figure 1 , the present invention provides a distribution network state estimation method based on network decomposition, said method comprising the following steps:

[0058] Step 1: Decompose the distribution network;

[0059] Step 2: Initialize the sub-network state variables;

[0060] Step 3: cyclic iteration solution;

[0061] Step 4: Calculate the equivalent measurement weight of the constraints;

[0062] Step 5: Solve the state variables of the sub-network;

[0063] Step 6: Determine whether the convergence condition is satisfied, if so, complete the iteration and output the distribution network state estimation result; otherwise, the number of iterations will increase by 1 and go to step 3.

[0064] Described step 1 comprises the following steps:

[0065] Step 1-1: Decompose the distribution network into multiple sub-networks based ...

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Abstract

The invention provides a power distribution network state estimation method based on network decomposition. The method comprises the following steps that a power distribution network is decomposed; sub-network state variable initialization is carried out; loop iteration solving is carried out; constraint condition equivalent measuration weight is computed; a sub-network state variable is solved; whether a convergence condition is met is judged, if yes, iteration is completed, and power distribution network state estimation results are output; and otherwise, 1 is added to iteration times automatically, and loop iteration solving is carried out. The applicability of a state estimation algorithm is improved, a large network can be subjected to state estimation, by network decomposition, the data scale of a node admittance matrix is lowered, the storage space requirements and computing complexity are lowered, for the large network, compared with direct computing, computing speed is high, and efficiency is high.

Description

technical field [0001] The invention relates to an estimation method, in particular to a distribution network state estimation method based on network decomposition. Background technique [0002] Distribution State Estimation (Distribution State Estimation, DSE) is a method that uses the correlation and redundancy of measurement data, applies computer technology, and uses mathematical processing methods to predict, fit, and Improve the reliability and integrity of the data, and effectively obtain the real-time status information of the distribution network. [0003] The access of distributed power sources, asymmetric lines and unbalanced loads in the distribution network will cause three-phase unbalance of the power flow; the state estimation of the distribution network needs to consider the three-phase unbalance. Some literatures have studied the measurement transformation and performance improvement of distribution network state estimation, which are of great significance...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00
CPCH02J3/00
Inventor 何开元刘科研孟晓丽盛万兴胡丽娟贾东梨刁赢龙叶学顺周峰戴唯
Owner STATE GRID CORP OF CHINA
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