Estimation method and device for distribution network depression domain with distributed photovoltaic

A distributed photovoltaic and sag domain technology, applied in electrical digital data processing, AC network voltage adjustment, single-network parallel feeding arrangement, etc., can solve the problem of low accuracy of sag domain range, and achieve accurate prediction results.

Active Publication Date: 2022-03-18
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to provide a method and device for estimating the depression area of ​​a distribution network containing distributed photovoltaics, which is used to solve the problem of low accuracy of the estimated range of the depression domain due to only considering the magnitude of the voltage drop

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  • Estimation method and device for distribution network depression domain with distributed photovoltaic
  • Estimation method and device for distribution network depression domain with distributed photovoltaic
  • Estimation method and device for distribution network depression domain with distributed photovoltaic

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Embodiment 1

[0038] The present invention provides a premise method of distributed photovoltaic distribution network shackulators, such as figure 1 As shown, the include:

[0039] S101 acquires line parameters and estimates of distribution network systems. Specifically, the line parameters include topologies, load parameters, and distributed power supplies in the distribution network system; the premise demand includes an estimated capacity or sensitive device of the photovoltaic.

[0040] S102 Constructs a distributed photovoltaic distribution network system model based on line parameters. Specifically, in the present embodiment, a distributed photovoltaic distribution network system model is built using PSCAD / EMTDC, wherein the photovoltaic uses the maximum power point tracking to control the solar controller output active power.

[0041] The voltage temporary parameter information in the S103 acquisition model includes: voltage temporary degradation value, voltage temporary sustained time...

Embodiment 2

[0084] The present application also discloses an estimated device for distributed photovoltaic distribution mesh shackulators, such as Figure 5 As shown, including:

[0085] The parameter demand acquisition module 501 is used to obtain line parameters and estimates of the distribution network system. The line parameters acquired include topologies, load parameters, and distributed power supplies in the distribution network system; prevailing requirements include input photovoltaic predicted capacity or sensitive devices.

[0086] The model build module 502 is used to build a distributed photovoltaic distribution network system model according to the line parameters. Specifically, the model build module uses PSCAD / EMTDC to build a distributed photovoltaic distribution network system model, wherein the photovoltaic uses the maximum power point tracking to control the solar controller output active power.

[0087] The pressure drop information acquisition module 503 is used to acqu...

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Abstract

This application discloses a method for estimating the depression domain of a distribution network with distributed photovoltaics, including: obtaining the line parameters and estimated demand of the distribution network system; building a distribution network system model with distributed photovoltaics; collecting the model The voltage sag parameter information in ; determine the voltage sag parameter judgment threshold; use the voltage sag amplitude threshold and the voltage sag duration threshold as the voltage sag judgment parameters to estimate the first concave domain; the voltage sag phase jump As a voltage sag determination parameter, the second depression domain is estimated; the first depression domain and the second depression domain are logically ORed to obtain the distribution network depression domain. The application also discloses a device for estimating the concave domain of the distribution network containing distributed photovoltaics. This application considers the impact of distributed photovoltaics on the concave domain of the distribution network under the sag amplitude, duration and phase jump, and the prediction is more accurate, which can provide a basis for the site selection of sensitive equipment in the actual system.

Description

Technical field [0001] The present invention relates to the power quality optimization of the power system, and in particular to a premise method and apparatus for distributed photovoltaic distribution mesh. Background technique [0002] The voltage recessed domain refers to a fault point in the power system caused voltage tubing, and the sensitive load at which the public connection point cares is not functionally operated. In other words, the voltage suspension caused by a related fault within the depression domain will cause the sensitive device to work properly. If the voltage caused by a failure outside the concave field range, the work of the sensitive device will not be affected. [0003] In recent years, the distribution network has been developed rapidly, in order to solve the problem of low and energy shortage problems, more and more distributed photovoltaic access networks, but their access results in different degrees of voltage temporary problems in the system. If th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/12H02J3/38G06F30/20G06F113/04
CPCH02J3/12Y02B10/10
Inventor 傅质馨王婧佳朱俊澎袁越
Owner HOHAI UNIV
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