Distribution network state estimation method based on hierarchical solution

A state estimation and network state technology, applied in the field of distribution network, can solve the problems that the calculation speed and solution accuracy of state estimation cannot be improved at the same time, limit the popularization practice of online fast state estimation, and expand the range of change in the operation range of distribution network, etc. Achieve fast calculation speed, improve accuracy, and reduce the number of iterations

Active Publication Date: 2017-12-08
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The development of the power system promotes the wider use of flexible equipment such as distributed power and electric vehicles in the distribution network, which makes the operating range of the distribution network expand, and the two-way flow of the power flow is frequent, which leads to the complex active distribution network when performing state estimation. Unavoidable problems such as slow calculation speed, large number of iterations and low calculation accuracy
The node scale of the distribution network is becoming larger and larger, and the scale of the prefecture-level distribution network reaches tens of thousands. At the same t

Method used

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  • Distribution network state estimation method based on hierarchical solution

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Embodiment 1

[0038] The purpose of the embodiment of the present invention is to consider the deficiencies in the existing distribution network state estimation technology, and propose a distribution network state estimation method based on hierarchical solution, which relies on the radial network structure characteristics of the distribution network, SCADA and The configuration of AMI measurement points is partitioned, based on the SCADA measurement data of distribution network automation, the available AMI real-time measurement data is fused, and the rapid operation of the distribution network is realized through network layering, AMI and SCADA hybrid strategies State estimation, see figure 1 , see the description below:

[0039] 101: Initialization: read the initial data of the distribution network, including: network topology and configuration of measurement points, etc.;

[0040] Wherein, this step is well known to those skilled in the art, and will not be repeated in this embodiment...

Embodiment 2

[0054] The scheme in embodiment 1 is further introduced below in conjunction with specific calculation formulas and examples, see the following description for details:

[0055] 1. Hierarchical partition method and branch variable relationship based on distribution network topology

[0056] Based on the tree hierarchical method of the distribution network, the distribution network is divided into hierarchical partitions to form a set S of sub-partitions. During the implementation process, for any distribution network with radial structure, it can be decomposed into figure 2 The multi-layer structure network shown, the specific layered partition principles and characteristics include:

[0057] (1) According to the network structure, the network and equipment such as stations, feeders, and users are divided into a series of moderate-scale subnets, and connected according to the tree structure. In the structure, each level is independent of each other. , different users or dev...

Embodiment 3

[0143] The feasibility of the schemes in Examples 1 and 2 will be verified below in combination with specific calculation examples, see the description below for details:

[0144] In order to compare the overall state estimation method of the distribution network with the effect of the layered state estimation method proposed in Embodiments 1 and 2 of the present invention, in this embodiment, the index determination of state estimation is as follows:

[0145] Using state estimation vector relative error absolute value percentage E k and filter index J k , the calculation formulas are:

[0146]

[0147]

[0148] In the formula, and x k are the true and estimated values ​​of the power flow of the state vector at time k, respectively; z k (i), and are the estimated value, true value, and measured value of the i-th quantity measurement at time k, respectively; where n is the total number of quantity measurements.

[0149] Among them, the filter index value J k Th...

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Abstract

The invention discloses a distribution network state estimation method based on hierarchical solution. The method comprises the steps of 1) performing hierarchical partitioning based on a network topological structure of a distribution network and the configuration of measurement points to form a sub-partition set, and determining the current and voltage relationship between tree branch circuits; 2) traversing and extracting a sub-partition from the tree root in the sub-partition set, and deleting the extracted sub-partition in the sub-partition set; 3) based on the SCADA and AMI measurement data, performing state estimation of hybrid measurement information based on the time-scale hierarchical solution on the extracted sub-partition; and 4) repeating the steps 2) and 3) to determine whether the sub-partition set is empty, if so, integrating and outputting the estimation result of each sub-partition at the current time, and otherwise, executing the step 2). The method of the invention improves the redundancy of the state estimation based on the added AMI real-time measurement data, realizes the hierarchical state estimation of the distribution network through a hybrid strategy of the AMI and the SCADA measurement data, and can improve the accuracy of the three-phase state estimation of the distribution network.

Description

technical field [0001] The invention relates to the field of distribution network, in particular to a distribution network state estimation method based on hierarchical solution. Background technique [0002] With the development of smart grid and information, communication and other technologies, the distribution network can obtain SCADA (Supervisory Control And Data Acquisition, data acquisition and monitoring) data through the distribution automation system, and through the advanced measurement system (Advanced Metering Infrastructure, AMI) Obtain real-time power consumption data of users, combined with network data provided by Geographic Information System (Geographic Information System) and Management Information System (Management Information System), etc., to provide a basis for the realization of measurable, observable and controllable power distribution system operation . Domestic and foreign studies on distribution network state estimation mainly rely on SCADA dat...

Claims

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Application Information

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IPC IPC(8): H02J3/00G06F17/16
CPCG06F17/16H02J3/00H02J2203/20
Inventor 孔祥玉王晟晨于力
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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