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Voltage control method and device for distributed optical storage system in power distribution network

A voltage control method and technology of an optical storage system, which are applied in circuit devices, AC network voltage adjustment, photovoltaic power generation, etc., can solve problems such as voltage instability in distribution networks, and achieve the effect of solving overvoltage problems and improving stability.

Pending Publication Date: 2022-02-08
国网青海省电力公司清洁能源发展研究院 +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, this application provides a voltage control method and device for a distributed optical storage system in a distribution network, which can solve the technical problem of unstable distribution network voltage of multiple distributed optical storage systems in the prior art

Method used

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  • Voltage control method and device for distributed optical storage system in power distribution network
  • Voltage control method and device for distributed optical storage system in power distribution network
  • Voltage control method and device for distributed optical storage system in power distribution network

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Embodiment 1

[0062] Such as figure 1 As shown, the embodiment of this application proposes a voltage control method for a distributed optical storage system in a distribution network, including:

[0063] Step 101: Obtain the current actual output of each distributed optical storage system in the distribution network;

[0064] Such as figure 2 As shown, the distribution network includes n distributed optical-storage systems, and the actual output of the i-th distributed optical-storage system at the current moment is PV stands for Photovoltaic and ES stands for Energy Storage.

[0065] Step 102: construct an objective function based on the output reduction of each distributed optical storage system, the output reduction is the difference between the predicted output at the next moment and the actual output at the current moment;

[0066] The objective function f is:

[0067]

[0068] in, is the output reduction of the i-th distributed optical storage system:

[0069]

[0070]...

Embodiment 2

[0101] Based on the above embodiments, this embodiment of the present application provides a voltage control device for a distributed optical storage system in a distribution network, see image 3 As shown, a voltage control device 200 for a distributed optical storage system in a power distribution network provided in an embodiment of the present application at least includes:

[0102] An acquisition unit 201, configured to acquire the actual output of each distributed optical storage system at the current moment;

[0103] The objective function construction unit 202 is configured to construct an objective function based on the output reduction of each distributed optical storage system, and the output reduction is the difference between the predicted output at the next moment and the actual output at the current moment;

[0104] The predicted output calculation unit 203 is used to obtain the optimal value of the output reduction of each distributed optical storage system tha...

Embodiment approach

[0127] As a possible implementation, the node voltage security constraints are:

[0128] u min ≤ U J ≤ U max

[0129] Among them, U J Indicates the voltage of the jth node; U min and U max Respectively represent the lower limit and upper limit of node safety voltage.

[0130] As a possible implementation manner, the actual control output calculation unit 204 is specifically used for:

[0131] Obtain the maximum actual output of the i-th distributed optical storage system

[0132] Obtain the maximum predicted output of the i-th distributed optical storage system

[0133] judge Is it greater than or equal to If yes, the actual control output of the i-th distributed photovoltaic storage system for:

[0134]

[0135] otherwise, Will Output as the output control target of the i-th distributed optical storage system.

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Abstract

The invention provides a voltage control method and device for a distributed optical storage system in a power distribution network, and relates to the technical field of power system analysis control. The method comprises the steps of acquiring the actual output of each distributed optical storage system at the current moment; constructing an objective function based on the output reduction amount of each distributed optical storage system, wherein the output reduction amount is the difference between the predicted output at the next moment and the actual output at the current moment; under the constraint condition of the objective function, solving the optimal value, which enables the objective function to be the minimum, of the output reduction amount of each distributed optical storage system so as to obtain the optimal predicted output at the next moment; and according to the relationship between the maximum actual output of each distributed optical storage system and the maximum predicted output of the distributed optical storage system, correcting the optimal predicted output of each distributed optical storage system at the next moment to obtain the actual control output of each distributed optical storage system at the next moment. According to the invention, the stability of the voltage of the power distribution network comprising a plurality of distributed optical storage systems can be improved.

Description

technical field [0001] The present application relates to the technical field of power system analysis and control, in particular to a voltage control method and device for a distributed optical storage system in a distribution network. Background technique [0002] The fluctuation of photovoltaic power generation usually poses challenges to the voltage stability operation of distribution network. Photovoltaic power generation with energy storage to form a distributed photovoltaic storage system is an important way to solve the overvoltage problem in the distribution network. In recent years, more and more scholars have paid more and more attention to this problem. [0003] The energy storage capacity of photovoltaic storage systems is generally 10% of the rated capacity of distributed photovoltaics. Therefore, during peak hours of solar radiation intensity, photovoltaic power generation may still cause overvoltage in the distribution network. It is the easiest way to solve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/12H02J3/28H02J3/38H02J3/46
CPCH02J3/381H02J3/46H02J3/12H02J3/28H02J2300/24H02J2203/10Y02E10/56Y02E70/30
Inventor 李正曦刘庭响李春来郑天文杨立滨李志青周万鹏张海宁潘磊
Owner 国网青海省电力公司清洁能源发展研究院
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