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Wind power virtual inertia optimization configuration method for improving small interference stability

A technology with small disturbance stability and virtual inertia, which is applied in wind power generation, single-network parallel feeding arrangement, etc.

Active Publication Date: 2019-11-05
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research on virtual inertia control has not fully considered the stability of the power grid. In order to cope with the continuous increase of wind power penetration, the optimal configuration method of virtual inertia needs further research

Method used

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  • Wind power virtual inertia optimization configuration method for improving small interference stability
  • Wind power virtual inertia optimization configuration method for improving small interference stability
  • Wind power virtual inertia optimization configuration method for improving small interference stability

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Experimental program
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Effect test

Embodiment 1

[0098] see Figure 1 to Figure 6 , an optimal configuration method of wind power virtual inertia for stable improvement with small disturbances, mainly includes the following steps:

[0099] 1) Obtain the basic data of the power system.

[0100] The power system includes a virtual inertia controlled N DFIG DFIG, N with excitation system and power system stabilizer SG synchronous generator. In the invention, the wind farm is equivalent to a single double-fed wind turbine. The synchronous generator adopts the fourth-order model and is equipped with IEEE Type I excitation system and power system stabilizer.

[0101] 2) Establish a small disturbance model of the power system and obtain the state matrix A of the power system s .

[0102] Further, the main steps to establish the small disturbance model of the power system are as follows:

[0103] 2.1) The virtual inertia control equations of double-fed fan are shown in formula 1 to formula 3 respectively:

[0104]

[0105...

Embodiment 2

[0181] The wind power virtual inertia optimization configuration method for small disturbance and stable improvement mainly includes the following steps:

[0182] 1) Obtain the basic data of the power system.

[0183] 2) Establish a small disturbance model of the power system and obtain the state matrix A of the power system s .

[0184] 3) Establish a virtual inertia optimization distribution model.

[0185] 4) Using Newton's method based on sensitivity analysis to solve the optimal distribution model of virtual inertia to complete the optimization of virtual inertia.

Embodiment 3

[0187]The wind power virtual inertia optimization configuration method for small disturbance stable promotion, the main steps are the same as embodiment 2, wherein, the present invention adopts IEEE Type I type excitation system, and the power system stabilizer such as figure 2 As shown, it can be described as follows:

[0188]

[0189]

[0190]

[0191]

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Abstract

The invention discloses a wind power virtual inertia optimization configuration method for improving small interference stability. The method mainly comprises the following steps of 1) acquiring basicdata of a power system; 2) establishing a small interference model of the electric power system, and acquiring the state matrix As of the electric power system; 3) establishing a virtual inertia optimal distribution model; and 4), adopting a sensitivity analysis-based newton method for solving a virtual inertia optimal distribution model, and completing the optimization of the virtual inertia. According to the method, the system frequency stability is taken as a constraint condition, so that the optimization model solving result meets the requirement of the system for frequency stability. Inaddition, by utilizing the sensitivity analysis-based newton method, the virtual inertia can be reasonably distributed, so that the small interference stability of the system is improved.

Description

technical field [0001] The invention relates to the field of electric power system and automation thereof, in particular to a wind power virtual inertia optimization configuration method for small disturbance stable improvement. Background technique [0002] In order to cope with the current environmental problems and future resource shortages, wind power will gradually replace traditional thermal power generation. However, due to the decoupling characteristics of the wind farm and the power system, the wind farm does not participate in the frequency response of the power grid, that is to say, the wind farm presents no inertia or low inertia, which threatens the stability of the power system. Therefore, in order to solve this problem, all countries require wind power to have the ability to provide virtual inertia to provide inertial support for the system, so that wind power can participate in the frequency response of the system. Judging from the current research, the rese...

Claims

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 余娟黄俊凯杨知方刘珏麟
Owner CHONGQING UNIV
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