A transient stability assessment method for wind farm systems considering the influence of random wind speed

A transient stability, wind farm technology, applied in the direction of electrical digital data processing, computer-aided design, instruments, etc., can solve problems including less research on wind power systems, less consideration of faults or disturbance random fluctuations, etc., to achieve the goal of simplifying the amount of calculation Effect

Active Publication Date: 2022-04-19
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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  • A transient stability assessment method for wind farm systems considering the influence of random wind speed
  • A transient stability assessment method for wind farm systems considering the influence of random wind speed
  • A transient stability assessment method for wind farm systems considering the 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 for evaluating the transient stability of a wind farm system considering the influence of random wind speed. Firstly, the energy function model of the wind farm system is established, and then the wind speed stochastic process model is constructed. The wind speed is expressed as a Wiener process, and the random The Euler method solves N trajectories of wind speed, and inputs these N trajectories as system state equations, obtains N trajectories of each input quantity in the energy function, and takes all input quantity trajectories corresponding to each wind speed trajectory as One group, calculate the energy function trajectory corresponding to the wind speed trajectory according to the energy function model, and finally use the potential energy boundary method to obtain the energy margin in the transient state of the wind farm system, and complete the transient stability evaluation of the wind farm system . The invention combines the energy function with the random fluctuation of the wind speed in the time domain, and is used to construct the transient stability evaluation index of the wind farm system, and the quantitative analysis considers the system transient stability under the random fluctuation of the wind speed.

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 (Doubly fed Induction Generator, double-fed asynchronous wind generator) has greatly improved the utilization efficiency of wind energy. The variation range of the output power also greatly exceeds 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....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G06F30/20G06F113/06
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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