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Method and device for estimating sag domain of power distribution network containing distributed photovoltaics

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

Active Publication Date: 2020-06-16
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • 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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  • Method and device for estimating sag domain of power distribution network containing distributed photovoltaics
  • Method and device for estimating sag domain of power distribution network containing distributed photovoltaics
  • Method and device for estimating sag domain of power distribution network containing distributed photovoltaics

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Embodiment 1

[0038] The present invention provides a method for predicting the depression domain of the distribution network containing distributed photovoltaics, such as figure 1 As shown, the included:

[0039] S101 Obtain line parameters and estimated demand of the distribution network system. Specifically, the line parameters include the topological structure, load parameters and distributed power sources in the distribution network system; the estimated demand includes the expected capacity of input photovoltaics or the expected location of sensitive equipment.

[0040] S102 Build a distribution network system model including distributed photovoltaics according to the line parameters. Specifically, in this embodiment, PSCAD / EMTDC is used to build a distribution network system model including distributed photovoltaics, where photovoltaics use maximum power point tracking to control the solar controller to output active power.

[0041] S103 collects voltage sag parameter information i...

Embodiment 2

[0085] The present application also discloses a device for estimating the concave domain of distribution network containing distributed photovoltaics, such as Figure 5 shown, including:

[0086] The parameter demand acquisition module 501 is used to acquire line parameters and estimated demand of the distribution network system. The obtained line parameters include the topological structure, load parameters and distributed power sources in the distribution network system; the estimated demand includes the estimated capacity of input photovoltaics or the estimated location of sensitive equipment.

[0087] The model building module 502 is used to build a distribution network system model including distributed photovoltaics according to line parameters. Specifically, the model building module uses PSCAD / EMTDC to build a distribution network system model with distributed photovoltaics, in which photovoltaics use maximum power point tracking to control the output active power of ...

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Abstract

The invention discloses a method for estimating a sag domain of a power distribution network containing distributed photovoltaics. The method comprises the steps: obtaining line parameters and estimation requirements of a power distribution network system; building a power distribution network system model containing distributed photovoltaics; acquiring voltage sag parameter information in the model; determining a voltage sag parameter judgment threshold; taking the voltage sag amplitude threshold value and the voltage sag duration threshold value as voltage sag judgment parameters, and estimating a first sag domain; taking the voltage sag phase jump as a voltage sag judgment parameter, and estimating a second sag domain; and performing logic OR operation on the first sag domain and the second sag domain to obtain a power distribution network sag domain. The invention further discloses a device for estimating the sag domain of the power distribution network containing the distributed photovoltaics. According to the method, the influence of distributed photovoltaics on the sag domain of the power distribution network under the sag amplitude, duration and phase jump is considered, sothat estimation is more accurate, and a basis can be provided for site selection of sensitive equipment in an actual system.

Description

technical field [0001] The invention relates to power quality optimization of a power system, in particular to a method and device for predicting a depression domain of a distribution network containing distributed photovoltaics. Background technique [0002] The voltage sag domain refers to the area where the voltage sag caused by a fault in the power system makes the sensitive load at the common connection point of concern unable to work normally. In other words, when a voltage sag caused by a related fault occurs within the recessed domain, it will cause the sensitive equipment to fail to work normally. If the voltage sag caused by a fault occurs outside the range of the recessed domain, it will not affect the operation of this sensitive equipment. [0003] In recent years, the distribution network has developed rapidly. In order to solve the problems of low environmental quality and energy shortage, more and more distributed photovoltaics are connected to the distributi...

Claims

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Application Information

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Patent Type & Authority Applications(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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