Small disturbance stability margin probability assessment method considering wind-speed random fluctuation

A technology with small disturbance, stable and random fluctuation. It is used in wind power generation, parallel feeding arrangement of a single network, etc. It can solve the problems of few factors to be considered in the establishment of wind speed model and unable to display operating conditions, and achieve the effect of reducing the calculation dimension.

Active Publication Date: 2019-11-08
NANJING UNIV OF SCI & TECH +1
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Problems solved by technology

[0004] The purpose of the present invention is to provide a small disturbance stability margin probability assessment method to solve the

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  • Small disturbance stability margin probability assessment method considering wind-speed random fluctuation
  • Small disturbance stability margin probability assessment method considering wind-speed random fluctuation
  • Small disturbance stability margin probability assessment method considering wind-speed random fluctuation

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[0083] Example

[0084] In this embodiment, the 3 wind farm feed-in system is taken as an example to verify the feasibility and effectiveness of the model and method of the present invention on the probability assessment of the small disturbance stability margin of random wind speed fluctuations. Table 1 and Table 2 are the grid-connected parameters and line parameters of the converter respectively.

[0085] Table 1 Parameters of converter grid-connected system

[0086]

[0087] Table 2 Three feed-in system network parameters

[0088]

[0089] The method of the present invention includes the following:

[0090] 1. Use the generalized short-circuit ratio method to establish a multi-direct-drive wind turbine grid-connected model and simplify the model, and then calculate the critical short-circuit ratio according to the model to obtain the critical short-circuit ratio α GCSCR . When the generalized short circuit ratio increases, the characteristic root curve of the system is as image 3...

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Abstract

The invention discloses a small disturbance stability margin probability assessment method considering wind-speed random fluctuation. The method considers the problem of uncertainty of small disturbance stability margin caused by randomness and uncertainty of wind power generation power, and is characterized by modeling and simplifying the system through a generalized short circuit ratio method, simulating fan output through a multiple-wind-farm random output model considering wind speed correlation between wind farms, providing a fan grid-connected oscillation stability margin probability assessment model, and then, solving oscillation stability margin and risk evaluation indexes through a Monte Carlo method. Simulation results show that the small disturbance stability margin probabilityassessment method considering wind-speed random fluctuation can effectively calculate the probability of system instability under different wind speed correlation and different stability margins, andhas a certain guiding significance for multiple-wind-farm grid-connected small disturbance stability margin probability assessment.

Description

technical field [0001] The invention belongs to the field of power system stability and control, in particular to a small disturbance stability margin probability evaluation method considering random fluctuations in wind speed. Background technique [0002] In recent years, wind power, as the renewable energy with the most development potential, has developed rapidly and has received considerable attention in the energy strategies of various countries. The integration of large-scale wind power into the grid leads to the coupling of a large number of asynchronous power sources with random fluctuations to the power system originally composed of controllable and dispatchable synchronous power sources, making the modern power system transform into a stochastic-deterministic coupled power system. The stability problem of this coupled power system brings new challenges to the stability analysis theory and method of conventional power system. Therefore, how to properly consider th...

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Application Information

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IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 张飞云卜京郑铭洲夏凡吴双孙莹蒋建斌夏星星卞婉春殷明慧谢云云邹云刘建坤周前汪成根张宁宇
Owner NANJING UNIV OF SCI & TECH
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