Method for rapidly evaluating maximum wind power permeability under consideration of frequency accumulation effect

A cumulative effect and penetration rate technology, applied in the field of rapid assessment of maximum wind power penetration rate, it can solve the problems of lower inertia level, worsening system frequency response, unfavorable system security, etc., and achieve the effect of ensuring safe and stable operation.

Active Publication Date: 2019-07-26
SOUTHEAST UNIV
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

As large-scale wind power gradually replaces traditional synchronous generators for grid-connected operation, the system inertia level is gradually decreasing, which further deteriorates the system frequency response under external disturbances, which is not conducive to system security.

Method used

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  • Method for rapidly evaluating maximum wind power permeability under consideration of frequency accumulation effect
  • Method for rapidly evaluating maximum wind power permeability under consideration of frequency accumulation effect
  • Method for rapidly evaluating maximum wind power permeability under consideration of frequency accumulation effect

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Embodiment 1

[0049] Those skilled in the art can understand that, unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this invention belongs. It should also be understood that terms such as those defined in commonly used dictionaries should be understood to have a meaning consistent with the meaning in the context of the prior art, and unless defined as herein, are not to be interpreted in an idealized or overly formal sense Explanation.

[0050] In this embodiment, the IEEE39 node test system is used as a simulation example to evaluate the maximum wind power penetration level of the regional power grid. The system loads are all static loads, and wind power is connected to node 30 to directly replace traditional synchronous generators of the same capacity. figure 2 This is the revised topological diagram of the IEEE39 node system including wind power in ...

Embodiment 2

[0109] When defining the frequency safety margin index η based on cumulative effects, the expression of the frequency safety margin index η can be expressed as:

[0110]

[0111] The lowest value of defined system frequency is actually less than f cr The time is tb, according to the severity of the system frequency offset, t b There are three types of situations for the value of , and the frequency trajectory curves of the three situations are as follows Figure 4a , Figure 4b , Figure 4c shown.

[0112] The calculation results of the system frequency safety margin index are different for each type of situation:

[0113] (a)t b =0, the frequency safety margin index η is:

[0114]

[0115] (b)0b cr When , the frequency safety margin index η is:

[0116]

[0117] (c)t b >t cr When , the frequency safety margin index η is:

[0118]

[0119] In this embodiment, the frequency safety and stability margin index η may be used to perform a safety warning on the...

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Abstract

The invention discloses a method for rapidly evaluating the maximum wind power permeability under consideration of a frequency accumulation effect. The method comprises the following steps that firstly, according to the polymerization of topological structure of a power grid, a generator and a speed regulator parameter, an average system frequency response model of a wind power grid-connected electric power system is established; a frequency safety stability margin index is calculated on the basis of the frequency accumulation effect; and the quantitative function relation between the wind power permeability level and the safety margin index is established by combining the frequency response characteristic and the safety margin index constraint, so that the frequency safety state and the maximum wind power permeability level of the wind power grid-connected electric power system can be quickly and effectively predicted. The frequency safety and stability margin index is provided by theinvention, the physical concept is clear, and the dynamic safety state of the system frequency can be objectively reflected, the frequency safety state and the maximum wind power permeability of thewind power grid-connected electric power system can be quickly and effectively predicted, and the method has important significance in guaranteeing safe and stable operation of the system.

Description

[0001] Field [0002] The invention belongs to the technical field of power grid security risk assessment, and in particular relates to a method for quickly assessing the maximum wind power penetration rate considering frequency accumulation. Background technique [0003] As one of the most mature and promising renewable energy sources, wind power has maintained a strong momentum of development in recent years. However, wind power generation is mostly connected to the grid through power electronic converters, and its active power and system frequency are in a decoupled state. It is difficult to provide inertia and primary frequency modulation support to the grid like traditional synchronous generators. As large-scale wind power gradually replaces traditional synchronous generators for grid-connected operation, the system inertia level is gradually decreasing, which further deteriorates the system frequency response under external disturbances, which is not conducive to system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/386H02J2203/20Y02E10/76
Inventor 戴剑丰汤奕
Owner SOUTHEAST UNIV
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