New energy cluster multi-station short circuit ratio calculation method and system

A new energy, short circuit ratio technology, applied in computing, resources, instruments, etc., can solve the problem of low accuracy of the real strength of the grid connection point of new energy units, and achieve the effect of accurate short circuit ratio

Pending Publication Date: 2022-04-29
CHINA ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing technology mainly calculates the short-circuit ratio of a single device, but only evaluates a single device separately, the evaluation results are too optimistic and one-sided, resulting in low accuracy in measuring the real strength of the grid-connected point of the new energy unit, the present invention proposes a New energy cluster multi-site short-circuit ratio calculation method, including:

Method used

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  • New energy cluster multi-station short circuit ratio calculation method and system
  • New energy cluster multi-station short circuit ratio calculation method and system
  • New energy cluster multi-station short circuit ratio calculation method and system

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Experimental program
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Effect test

Embodiment 1

[0052] A new energy cluster multi-site short-circuit ratio calculation method, such as figure 1 shown, including:

[0053] Step 1: Obtain the current and voltage injected into the grid by each new energy station;

[0054] Step 2: Based on the current and voltage injected into the power grid by each new energy station, analyze the voltage influence between each new energy station, and obtain the voltage interaction coefficient;

[0055] Step 3: Calculate the short-circuit capacity of the machine terminal bus of each new energy station based on the current and voltage injected into the grid by each new energy station;

[0056] Step 4: Calculate the new energy multi-site short-circuit ratio based on the voltage interaction coefficient and the machine-side target short-circuit capacity combined with the new energy multi-site short-circuit ratio calculation formula.

[0057] The present invention proposes a new energy cluster multi-site short-circuit ratio calculation method, the...

Embodiment 2

[0093] A method for calculating the short-circuit ratio of multiple stations in a new energy cluster, including:

[0094] (1) Define the calculation method for the short-circuit ratio of new energy multi-site stations:

[0095] Define the calculation method for the short-circuit ratio of new energy multi-site stations, including:

[0096] Link 1-1: Calculation method of short-circuit ratio of new energy multi-site stations:

[0097]

[0098] In the formula, P i +jQ i is the apparent power of new energy station i, P l +jQ l is the apparent power of the new energy station l;

[0099] Session 1-2: Definition is the voltage interaction coefficient between node l and node i:

[0100]

[0101] In the formula, is the self-impedance of node i, is the mutual impedance between node l and node i.

[0102] (2) Set the short-circuit ratio calculation process for new energy multi-site stations, including:

[0103] Link 2-1: Power flow calculation;

[0104] Link 2-2: Det...

Embodiment 3

[0110] Based on the same inventive concept, the present invention also provides a new energy cluster multi-site short-circuit ratio calculation system, including:

[0111] The obtaining module is used to obtain the current and voltage injected into the grid by each new energy station;

[0112] The coefficient calculation module is used to analyze the voltage influence between each new energy station based on the current and voltage injected into the power grid by each new energy station, and obtain the voltage interaction influence coefficient;

[0113] The capacity calculation module is used to calculate the short-circuit capacity of the machine terminal bus of each new energy site based on the current and voltage injected into the grid by each new energy site;

[0114] The short-circuit ratio calculation module is used to calculate the new energy multi-site short-circuit ratio based on the voltage interaction coefficient and the machine-side bus short-circuit capacity combin...

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Abstract

The invention provides a new energy cluster multi-station short-circuit ratio calculation method and system. The method comprises the following steps: acquiring current and voltage injected into a power grid by each new energy station; analyzing the voltage influence between the new energy stations based on the current and voltage injected into the power grid by the new energy stations to obtain a voltage interaction influence coefficient; calculating the short-circuit capacity of the machine end bus of the new energy station based on the current and voltage injected into the power grid by each new energy station; and calculating the new energy multi-station short-circuit ratio based on the voltage interaction influence coefficient and the machine-end bus short-circuit capacity in combination with a new energy multi-station short-circuit ratio calculation formula. According to the method, the mutual influence among the new energy stations is considered, so that the calculated short-circuit ratio is more accurate.

Description

technical field [0001] The invention relates to the field of new energy power generation technology and power systems, in particular to a method and system for calculating the short-circuit ratio of multiple stations in a new energy cluster. Background technique [0002] New energy such as wind power and photovoltaics is the main development mode of new energy. Areas with concentrated new energy development generally have few conventional power sources, weak voltage and frequency support, and the stability problems caused by large-scale new energy development are prominent, including transient overvoltage and broadband oscillation. Studies have shown that the occurrence of these problems has a great relationship with the grid strength of new energy grid-connected points. The weaker the grid strength, the greater the risk of overvoltage, oscillation and other stability problems. [0003] The short-circuit ratio is an important indicator to measure the power grid strength of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02J3/48H02J3/50G06Q10/06G06Q50/06
CPCH02J3/38H02J3/48H02J3/50G06Q10/06393G06Q50/06H02J2300/24H02J2300/28
Inventor 陈国平李明节许涛贺静波张怡陈宁陈春萌葛路明吴福保赵东宁
Owner CHINA ELECTRIC POWER RES INST
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