Method and system for evaluating dynamic energy stability of double-fed fan grid-connected system

A doubly-fed wind turbine and system dynamic technology, applied in wind power generation, measuring electricity, measuring devices, etc., can solve the problems of low accuracy of stability assessment, to ensure operation stability and safety, small amount of calculation, and adjustment process quick effect

Active Publication Date: 2020-09-04
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a method and system for evaluating the dynamic energy stability of a doubly-fed wind turbine grid-connected system to solve the problem of low stability assessment accuracy of the existing wind turbine grid-connected system

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  • Method and system for evaluating dynamic energy stability of double-fed fan grid-connected system
  • Method and system for evaluating dynamic energy stability of double-fed fan grid-connected system
  • Method and system for evaluating dynamic energy stability of double-fed fan grid-connected system

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Embodiment 1

[0050] Embodiment 1 of the present invention discloses a method for evaluating the dynamic energy stability of a doubly-fed fan grid-connected system, the schematic diagram is as follows figure 1 As shown, the steps are as follows:

[0051] Step S1: When sub-synchronous oscillation occurs in the double-fed wind turbine grid-connected system, collect the instantaneous values ​​of voltage and current at the grid-connected point of the wind turbine and the series compensation point;

[0052] Preferably, in step S1, whether subsynchronous oscillation occurs in the doubly-fed wind turbine grid-connected system is detected by the following method: real-time collection of the current at the grid-connected point of the wind turbine, if the current frequency at the grid-connected point of the wind turbine is within the sub-synchronous oscillation frequency range , it is determined that subsynchronous oscillation occurs in the double-fed wind turbine grid-connected system; preferably, t...

Embodiment 2

[0092] In embodiment 2 of the present invention, as figure 2 The equivalent wind farm connected to the grid through series compensation is shown as an example. The equivalent model of double-fed wind turbine parallel connection is used to simulate the wind farm, and the simulation model is built on the Matlab / Simulink platform. The wind farm is composed of 100 identical doubly-fed wind turbines connected in parallel. After the outlets of the wind turbines are connected in parallel, they supply power to the grid through the busbar. The rated capacity of each wind turbine is 1.5MW, and they operate according to the rated output. The wind turbines adopt the generator practice. The subsynchronous oscillation of the wind turbine grid-connected system is induced by changing the grid-connected parameters of the doubly-fed wind turbine, so as to verify the dynamic energy of the wind turbine. The parameters of DFIG are shown in Table 1.

[0093] Table 1 Parameters of DFIG

[0094] ...

Embodiment 3

[0117] Embodiment 3 of the present invention discloses a dynamic energy stability evaluation system of a doubly-fed fan grid-connected system, such as Figure 12 As shown, it includes: a data acquisition module, used to collect the instantaneous values ​​of voltage and current at the grid-connected point of the fan and the series compensation place when the sub-synchronous oscillation occurs in the doubly-fed fan grid-connected system; a dynamic energy acquisition module, used to The instantaneous value of the voltage and current at the wind turbine grid-connected point and the series compensation point output by the collection module is used to obtain the dynamic energy of the double-fed wind turbine grid-connected system; the aperiodic component extraction module is used to collect the integer-period double-fed wind turbine grid-connected system. Dynamic energy, from which the non-periodic component is extracted; the stability evaluation module is used to analyze the rate of ...

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Abstract

The invention relates to a method and system for evaluating the dynamic energy stability of a double-fed fan grid-connected system, which belongs to the technical field of wind power generation systems and solves the problem of low stability assessment accuracy of the existing wind turbine grid-connected system. The method comprises the following steps: when subsynchronous oscillation occurs in the doubly-fed wind turbine grid-connected system, collecting instantaneous values ​​of voltage and current at the grid-connected point of the wind turbine and the series compensation place; based on the instantaneous voltage and current values ​​at the grid-connected point of the wind turbine and the series compensation place, obtaining The dynamic energy of the double-fed fan grid-connected system; collect the dynamic energy of the double-fed fan grid-connected system with an integer period, and extract the aperiodic component from it; if the change rate of the aperiodic component is positive, the double-fed fan The grid-connected system has negative damping characteristics, and the oscillation diverges; on the contrary, the double-fed fan grid-connected system has positive damping characteristics, and the oscillation converges. The method in the invention can accurately and effectively evaluate the stability of the double-fed fan grid-connected system.

Description

technical field [0001] The invention relates to the technical field of wind power generation systems, in particular to a method and system for evaluating dynamic energy stability of a doubly-fed wind turbine grid-connected system. Background technique [0002] In recent years, with the rapid increase of the access capacity of wind turbines, the dynamic characteristics of modern power grids have changed, and the new subsynchronous oscillation problem has become prominent. In October 2009, an oscillation accident occurred in a doubly-fed wind farm in Texas, USA, causing a large number of units to go off-grid. After analysis, the cause of the accident was the mutual boosting oscillation between the machine-side converter of the doubly-fed wind turbine and the series compensation on the transmission line. This type of oscillation appeared for the first time. In recent years, there have been many similar subsynchronous oscillation accidents in China, including the Guyuan subsync...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38G06F30/20G06Q10/06G06Q50/06G01R31/00
CPCH02J3/386G06Q10/0639G06Q50/06G01R31/00G06F30/367H02J2203/20Y02P90/82Y02E10/76
Inventor 马静杨更宇张嘉鑫李沛
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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