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Quantitative estimation method for friendliness of power grid accessed to doubly-fed wind field

A technology for quantitative evaluation and access to the power grid, which is applied to wind power generation, electrical components, circuit devices, etc., and can solve problems such as inaccurate analysis results and difficult accurate modeling of the system

Active Publication Date: 2019-03-15
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the actual system is difficult to accurately model, and the simplification may lead to inaccurate analysis results

Method used

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  • Quantitative estimation method for friendliness of power grid accessed to doubly-fed wind field
  • Quantitative estimation method for friendliness of power grid accessed to doubly-fed wind field
  • Quantitative estimation method for friendliness of power grid accessed to doubly-fed wind field

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Experimental program
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Effect test

Embodiment 1

[0174] First, the present invention conducts quantitative stability evaluation on a DFIG through Matlab / Simulink, and studies the influence of different controls on the input and output characteristics of the doubly-fed wind field. The detailed parameters of the DFIG are as follows:

[0175] S B =1.67MVA,V B =575V, H=0.685sR s =0.023 p.u., L s = 0.18 p.u., L m = 2.9 p.u., R r =0.016p.u., L r =0.16 p.u.

[0176] The terminal voltage drop is selected as the input signal, since the rotor current can reflect the power control capability of the wind turbine, the rotor current is selected as the output signal, and the rotor current limit is set to I r ≤2p.u., based on the proposed subsystem quantitative evaluation algorithm, the present invention analyzes the asymptotic gain estimation of different strategies of input and output characteristics of DFIG under conventional PI control, PI-based improved control and nonlinear control as follows:

[0177]

[0178]

[0179] ...

Embodiment 2

[0186] To quantitatively evaluate the stability of the power system after the doubly-fed wind farm is connected to the grid, the overall structure of the test system is as follows: image 3 shown.

[0187] In order to study the short-term voltage stability of the power system mentioned above, the input and output of each subsystem should be selected reasonably. The input and output of the synchronous generator are respectively selected as current and voltage, the input and output of DFIG are respectively selected as terminal voltage and stator current, and the input and output of the load are respectively selected as voltage and current. The safe operation constraints of the power system are set as follows: after the fault is cleared, the voltage of each node in the system should not be less than 0.8p.u, and the maximum limit value of the rotor current of DFIG is set to 2p.u.

[0188] (1) LISS / LIOS attribute estimation of DFIG

[0189] DFIG's LIOS characteristic estimation r...

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Abstract

The invention relates to a quantitative estimation method for friendliness of a power grid accessed to a doubly-fed wind field. On the basis of input-state stability equivalent definition form integral-integral estimation, local input-state stability / local input-output stability attribute of a sub-system is estimated in advance by a simulation method, the local input-state stability / local input-output stability attribute comprises maximum input integral energy, local stability domain, Alpha<0><IOS> / Alpha<0><ISS> and asymptotic gain, and the asymptotic gain is estimated by segmented linear form; and a small gain condition and a local stability limit of a power system after being connected with the doubly-fed wind power are calculated and acquired according to stability quantitative estimation criterion of an interconnection system, and the friendliness of the power grid accessed to the doubly-fed wind field is quantitatively estimated. The correctness of the proposed method is verifiedby time domain simulation. By the quantitative estimation method for the friendliness of the power grid accessed to the doubly-fed wind field, the influence of grid connection of the doubly-fed wind field on quantitative stability of a short-term voltage of the power system can be researched.

Description

technical field [0001] The invention belongs to the technical field of power system control, and in particular relates to a quantitative evaluation method for the friendliness of a doubly-fed wind field connected to a power grid. Background technique [0002] As the global energy shortage and environmental pollution become more and more serious, vigorously developing renewable energy has become the consensus of the whole world. Among them, wind energy is one of the most important renewable energy sources, which has received great attention in recent years. At the same time, due to the intermittent nature of wind power, in order to improve the friendliness of wind power to the grid, it is necessary to effectively evaluate the impact of wind power grid integration on the power system. [0003] Most of the existing analysis and research on the stability of DFIG grid-connected at home and abroad focus on the problem of power angle stability. Because DFIG is sensitive to grid vo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386H02J2203/20Y02E10/76
Inventor 秦博宇方铖李景孙浩源谢鹏浩
Owner XI AN JIAOTONG UNIV
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