Energy stability domain determination method and system for doubly-fed wind power grid-connected system

A technology of double-fed wind power and determination method, which is applied in the fields of electrical digital data processing, special data processing applications, instruments, etc.

Active Publication Date: 2019-10-08
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a method and system for determining the energy stability region of...

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  • Energy stability domain determination method and system for doubly-fed wind power grid-connected system
  • Energy stability domain determination method and system for doubly-fed wind power grid-connected system
  • Energy stability domain determination method and system for doubly-fed wind power grid-connected system

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Embodiment 1

[0077] The Energy Stability Region (ESR) of a wind power grid-connected system refers to the set of disturbance energies that can keep the system angularly stable at a certain operating point. First of all, it needs to be clear that the oscillation process that occurs after the doubly-fed wind power grid-connected system is disturbed is essentially a process of energy injection, interaction and dissipation. The process of oscillation is not only affected by external disturbance, but also affected by its own damping. When the system finally reaches a stable state, the internal and external energies of the system also reach a balance at the same time, that is, the energy input to the system by external disturbances is equal to the energy consumed by the system's own damping. In the present invention, the active power injected from the outside is used as the external disturbance, and the damping energy of the synchronous generator and the damping energy of the doubly-fed wind tur...

Embodiment 2

[0116] by image 3 Taking the improved IEEE4-machine 11-node system as an example, the control parameters of the doubly-fed wind turbine are: K P_PLL = 1 p.u.,K ω = 1 p.u., T ω = 0.1 p.u. Taking the power of loads L1 and L2 as the two dimensions of the injected power space, the energy stability domain and boundary of the wind power grid-connected system are drawn as Figure 4 , Figure 5 shown.

[0117] In order to verify the correctness of the energy stability domain, in Figure 5 Take 3 points (A, B, C) respectively inside, outside and boundary of the energy stability domain shown, and analyze its stability, as Image 6 shown. Depend on Image 6 It can be seen that point A inside the stable domain is stable, point C outside the stable domain is unstable, and point B on the boundary of the stable domain is in a critically stable state. That is, the energy stability domain can describe the area where the wind power grid-connected system can operate safely and stably a...

Embodiment 3

[0124] Embodiment 3 of the present invention discloses a system for determining the energy stability region of a doubly-fed wind power grid-connected system, the schematic diagram is as follows Figure 13 As shown, the system includes an initial search point acquisition module, a critical point set acquisition module, and an energy stability domain acquisition module; among them, the initial search point acquisition module is used to select a certain operation satisfying that the total damping energy is positive from the stability domain parameter space point is used as the initial search point, and the active power injection of all nodes in the doubly-fed wind power grid-connected system constitutes the stable domain parameter space; the critical point set acquisition module is used to start from the initial search point to construct a practical and feasible A set of basic search points within the search range; it is also used to perform damping energy analysis on each search ...

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Abstract

The invention relates to an energy stability domain determination method and system for a doubly-fed wind power grid-connected system, belongs to the technical field of fan grid-connected stability domain research, and solves the problem of stable operation of the wind power grid-connected system at the present stage. The method comprises the following steps: selecting a certain operation point with positive total damping energy from a stable domain parameter space as an initial search point, and injecting active power of all nodes in the doubly-fed wind power grid-connected system to form thestable domain parameter space; obtaining a basic search point set in a feasible search range by taking the initial search point as a starting point; determining unstable search points in the basic search point set; establishing a connection line between an initial search point and each unstable search point, and carrying out critical point search to obtain a critical point set; obtaining corresponding total damping energy according to the node active power injection of each critical point in the critical point set, forming an energy stability domain boundary by the total damping energy obtained by all the critical points, and obtaining the energy stability domain of the double-fed fan grid-connected system.

Description

technical field [0001] The invention relates to the technical field of energy stability domain research of a wind power grid-connected system, in particular to a method and system for determining an energy stability domain of a doubly-fed wind power grid-connected system. Background technique [0002] For a long time, the analysis of the safety and stability of the power system has generally been carried out under one or more fault modes according to a specific operating state. This type of method is called the point-by-point method. Some existing research methods, such as eigenvalue analysis, frequency domain analysis and time domain simulation, all belong to the category of point-by-point method. These methods focus on analyzing the impact of wind power grid-connected on the oscillation mode and damping characteristics of the system from the perspective of system power flow, but the conclusions obtained are strictly consistent with the current operating state of the system...

Claims

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Application Information

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IPC IPC(8): G06F17/50G06Q50/06
CPCG06Q50/06G06F30/20
Inventor 马静张敏周晓东赵冬
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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