A method and system for historical state estimation of distribution network based on hybrid measurement

A technology of historical state and mixed measurement, applied in the direction of communication network, computing, electrical components, etc. with energy trade/energy transmission authority, can solve the problem of low state estimation accuracy, improve the accuracy of historical state estimation, improve efficiency and reliability effect

Active Publication Date: 2021-06-29
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Abstract
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Problems solved by technology

[0004] In order to solve the problem of low accuracy of state estimation caused by insufficient SCADA measurement configuration, the present invention provides a historical state estimation method of distribution network based on hybrid measurement

Method used

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  • A method and system for historical state estimation of distribution network based on hybrid measurement
  • A method and system for historical state estimation of distribution network based on hybrid measurement
  • A method and system for historical state estimation of distribution network based on hybrid measurement

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Embodiment 1

[0075] This embodiment proposes a method for estimating the historical state of the distribution network based on hybrid measurement. The method in this embodiment comprehensively utilizes SCADA and marketing hybrid measurement historical data to realize the historical state estimation of the distribution network, which improves the analysis accuracy and reliability. sex.

[0076] Specific as figure 1 As shown, the method of this embodiment specifically includes:

[0077] Step S1, obtaining the marketing measurement data of any period in the marketing system and the SCADA measurement data of multiple time sections in the corresponding period in the distribution automation system;

[0078] Step S2, remove the branches configured with SCADA measurement, so as to divide the distribution network into multiple observation islands and perform observability analysis; the observation islands in this embodiment are the areas connected by branches without SCADA measurement ;

[0079]...

Embodiment 2

[0134] This embodiment proposes a distribution network historical state estimation system based on hybrid measurement. The system of the present invention includes a data acquisition module, a SCADA state definition and equality constraint building module, a SCADA measurement model building module, and a marketing measurement model. Building block, SCADA pseudo-measurement model building block, solution block and output block.

[0135] The data acquisition module of this embodiment is used to obtain the marketing measurement data of any period of the marketing system and the SCADA measurement data of multiple time sections of the corresponding period in the distribution automation system; the specific process is as described in the above-mentioned embodiment 1, here I won't repeat them here.

[0136] The SCADA state definition and equality constraint building block of this embodiment is used to determine the state quantities and equality constraints of each SCADA measurement s...

Embodiment 3

[0143] This embodiment uses the IEEE33 node distribution network to test the method proposed in the above embodiment. The load power of each node in the IEEE33 node distribution network is shown in Table 1. According to the power flow calculation results, the unit output of node 1 can be obtained as 3917.68+ j2435.15(kVA). Measurement configuration: Node 1 is configured with SCADA measurement (including node voltage amplitude and branch power measurement), but no marketing measurement is configured; nodes 2~33 are not configured with SCADA measurement, but are all configured with marketing measurement, That is, each load is equipped with active and reactive power measurement.

[0144] The SCADA measurement configuration corresponds to the situation in the actual 10kV distribution network that only the substation busbar is configured with voltage measurement, and the substation outlet switch is configured with power measurement.

[0145] Table 1 Power injection of each node in...

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Abstract

The invention discloses a method and system for estimating the historical state of distribution network based on mixed measurement. The method of the invention improves the problem of lack of SCADA measurement data in the actual distribution network by establishing a SCADA and marketing mixed measurement state estimation model. , can more accurately calculate the load and power flow distribution of the distribution network, provide more accurate and reliable basic data for theoretical line loss calculation and distribution network economic analysis, and improve the accuracy of historical state estimation. The present invention decouples the state estimation modeling from the algorithm by constructing a distribution network hybrid measurement state estimation model in the form of a quadratic equation in a Cartesian coordinate system, and can use the existing mature state estimation algorithm to solve the problem and improve the distribution network hybrid measurement state estimation model. Measure state estimation efficiency and reliability.

Description

technical field [0001] The invention belongs to the technical field of distribution network scheduling automation, and in particular relates to a method and system for estimating the historical state of a distribution network based on hybrid measurement. Background technique [0002] The wide variety of distribution network points makes its SCADA (Supervisory Control And Data Acquisition Monitoring and Data Acquisition) real-time measurement configuration seriously insufficient, far from meeting the observability requirements of state estimation. In real-time state estimation of distribution network, a large number of pseudo-measurements need to be added for state estimation, resulting in low accuracy of state estimation, which is difficult to meet the needs of applications such as distribution network theoretical line loss calculation and economic analysis. The measurement configuration of the marketing system is relatively sufficient, and most distribution networks can ach...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00G06Q10/06G06Q50/06
CPCG06Q10/0639G06Q50/06H02J3/00H02J3/008H02J2203/10H02J2203/20
Inventor 张华龙呈郭瑞鹏董丽澜高艺文苏学能李世龙
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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