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Method of evaluating transient stability of wind farm system considering influence of random wind speed

A transient stability, wind farm technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems including less research on wind power systems, less consideration of faults or disturbance random fluctuations, etc., to achieve simplified calculations Effect

Active Publication Date: 2019-11-12
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

However, the current energy function method rarely considers the random fluctuation of faults or disturbances in the time domain, and there are few studies on wind power systems.

Method used

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  • Method of evaluating transient stability of wind farm system considering influence of random wind speed
  • Method of evaluating transient stability of wind farm system considering influence of random wind speed
  • Method of evaluating transient stability of wind farm system considering influence of random wind speed

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Embodiment

[0024] figure 1 It is a flow chart of a specific embodiment of the wind farm system transient stability evaluation method considering the influence of random wind speed in the present invention. Such as figure 1 As shown, the specific steps of the wind farm system transient stability evaluation method considering the impact of random wind speed in the present invention include:

[0025] S101: Construct the energy function model of the wind farm system:

[0026] Firstly, the energy function model of the wind farm system needs to be constructed, and the specific energy function model construction method can be determined according to actual needs.

[0027] In this embodiment, the mutual conversion of kinetic energy and potential energy inside the generator described by the traditional stand-alone energy function is firstly extended to each component of the system. At the system level, the generator is regarded as a node, and only the transient properties of the system reflect...

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Abstract

The invention discloses a method of evaluating the transient stability of a wind farm system considering the influence of a random wind speed. First, an energy function model of the wind farm system is established, a wind speed random process model is then constructed, the wind speed is expressed as a Wiener process, N trajectories of the wind speeds are solved by using a random Euler method, theN trajectories are used as input of system state equations, the N trajectories of each input amount in the energy function are obtained, all input amount trajectories corresponding to each wind speedtrajectory are used as a group, the energy function trajectory corresponding to the wind speed trajectory is calculated according to the energy function model, and finally, the energy margin of the wind farm system under a transient condition is solved by adopting a potential energy boundary method, and transient stability assessment of the wind farm system is completed. The energy function is combined with the random fluctuation of the wind speed in a time domain for constructing the transient stability evaluation index of the wind farm system, and the system transient stability under the random fluctuation of the wind speed is quantitatively analyzed.

Description

technical field [0001] The invention belongs to the technical field of wind power system stability, and more specifically relates to a method for evaluating the transient stability of a wind farm system considering the influence of random wind speed. Background technique [0002] In recent years, renewable energy technologies represented by wind energy have developed vigorously. The rapid development of variable-speed constant-frequency fans represented by DFIG (Doublyfed Induction Generator, double-fed asynchronous wind generator) has greatly improved the utilization efficiency of wind energy. The range of power change is also much higher than that of the old-fashioned constant speed and constant frequency fans. Due to its large volatility, the integration of large-scale wind power has brought new challenges to the transient stability of the power system, especially in the case of high wind power intensity, the random fluctuation of wind speed cannot be ignored. Therefore...

Claims

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Application Information

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IPC IPC(8): H02J3/38G06F17/50
Inventor 刘群英刘奕岑宋迎新倪少剑章凡霍欣莉衡一佳陈树恒张昌华
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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