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Distributed Robust State Estimation Method and System for Active Distribution Network Considering Communication Failure

An active distribution network and state estimation technology, applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problem of low calculation efficiency of distributed state estimation, failure of communication failure, and distributed state of communication failure Estimation of impact etc.

Active Publication Date: 2020-11-13
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) The impact of communication failures (represented by bad data) within sub-regions on distributed state estimation is not considered;
[0007] (2) The impact of communication failure between sub-regions in the distributed communication architecture on distributed state estimation is not considered;
[0008] (3) The calculation efficiency of distributed state estimation is not high

Method used

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  • Distributed Robust State Estimation Method and System for Active Distribution Network Considering Communication Failure
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  • Distributed Robust State Estimation Method and System for Active Distribution Network Considering Communication Failure

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Embodiment 1

[0041] In one or more implementations, a distributed robust state estimation method for active distribution networks considering communication failures is disclosed. Refer to figure 2 , including the following steps:

[0042] (1) Give the communication architecture of distributed state estimation, and analyze the negative impact of communication failure on distributed state estimation in the distributed communication architecture;

[0043] Such as figure 1 As shown, the distributed communication architecture is divided into three layers, which are composed of communication within sub-regions, communication between sub-regions, and communication between sub-regions and the control center. Each layer of communication corresponds to different communication tasks and functions. The distributed state of the distribution network In the context of estimation, internal communication in sub-regions is mainly used to collect measurement information collected by terminals, upload it to...

Embodiment 2

[0096] In one or more embodiments, a distributed robust state estimation system for an active distribution network considering communication failure is disclosed, comprising:

[0097] A device for dividing the distribution network into Ns sub-regions and establishing a distributed state estimation model;

[0098]A device for constructing a three-layer distributed communication architecture; wherein, the three-layer distributed communication architecture consists of communication within sub-regions, communication between sub-regions, and communication between sub-regions and the control center;

[0099] A device for implementing local state estimation of each sub-area by using the improved weighted least squares method for each sub-area;

[0100] A device for coordinating estimates of the state quantities and their standard deviations of overlapping nodes between adjacent subregions using a consensus algorithm; the obtained state quantities and their standard deviation estimate...

Embodiment 3

[0104] In one or more embodiments, a terminal device is disclosed, including a server, the server includes a memory, a processor, and a computer program stored on the memory and operable on the processor, and the processor executes the The program realizes the distributed robust state estimation method of the active distribution network considering communication failure in the first embodiment. For the sake of brevity, details are not repeated here.

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Abstract

The invention discloses a method and system for distributed robust state estimation of an active distribution network considering communication failure, comprising: dividing the distribution network into Ns sub-regions, establishing a distributed state estimation model; Communication between sub-regions and the control center constitutes a three-layer distributed communication architecture; the improved weighted least squares method is used for each sub-region to realize the local state estimation of each sub-region; the consensus algorithm is used to coordinate overlapping nodes between adjacent sub-regions The estimated value of the state quantity and its standard deviation is used as a new virtual measurement and its error for the next iterative calculation of the local state estimation; it is judged whether the distributed state estimation meets the convergence condition, and the distributed state estimation result is recorded. The invention proposes a distributed robust state estimation method, which effectively improves calculation efficiency compared with the traditional distributed state estimation method.

Description

technical field [0001] The invention relates to the technical field of distribution network state estimation, in particular to a distributed robust state estimation method and system for an active distribution network considering communication failure. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] Distribution network state estimation is one of the advanced applications of power distribution management system. The filtering method estimates the complete, accurate and reliable operating state of the distribution network, provides accurate state information for real-time and effective control and management of the distribution network, and provides accurate data support for other advanced applications in the distribution management system. Since the active distribution network has the characteristics of large system scale, three-phase imb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06F30/20
CPCH02J3/00G06F30/20H02J2203/20
Inventor 张文袁佩然张婷婷
Owner SHANDONG UNIV