Power distribution network state estimation method 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
CN104300536AActive Publication Date: 2015-01-21STATE GRID CORP OF CHINA +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
STATE GRID CORP OF CHINA
Publication Date
2015-01-21

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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.
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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...

Claims

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