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AC-DC hybrid power grid probability power flow analysis method taking regard of rank correlation among multiple types of nondeterminacy sources

An AC-DC hybrid, uncertain technology, applied in the direction of AC network, AC network circuit, circuit device, etc. with the same frequency from different sources, can solve the problems of difficult approximation of the original distribution, limit the application range of Pearson correlation coefficient, etc.

Inactive Publication Date: 2017-08-25
CHONGQING UNIV
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Problems solved by technology

The disadvantage of this scheme is that it assumes a Gaussian distribution for all random input variables
But there are still two deficiencies: First, it is difficult to accurately approximate the original distribution by using the symmetric point selection strategy of UT to directly select sample points on any asymmetric distribution, such as directly selecting sample points on Weibull distributions with different parameters ; Second, when the input variables obey different distribution types, the Pearson correlation coefficient can only reflect the linear correlation between random variables
Since the correlation of the random variables of the input power grid is not limited to linear correlation, this shortcoming limits the application range of the Pearson correlation coefficient

Method used

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  • AC-DC hybrid power grid probability power flow analysis method taking regard of rank correlation among multiple types of nondeterminacy sources
  • AC-DC hybrid power grid probability power flow analysis method taking regard of rank correlation among multiple types of nondeterminacy sources
  • AC-DC hybrid power grid probability power flow analysis method taking regard of rank correlation among multiple types of nondeterminacy sources

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[0036] The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the subject of the present invention is limited to the following examples. Without departing from the above-mentioned technical idea of ​​the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

[0037] In this embodiment, the steady-state model of the VSC converter station is as follows figure 1 shown. In this model, the unbalance equation of DC system including VSC is as follows:

[0038]

[0039]

[0040]

[0041]

[0042] Among them, P sj and Q sj is the active power and reactive power absorbed by the jth VSC from the AC system side. is the fundamental voltage phasor of the AC bus connected to VSC. is the fundamental voltage phasor of input VSC. δ j for with t...

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Abstract

The invention discloses an AC-DC hybrid power grid probability power flow analysis method taking regard of rank correlation among multiple types of nondeterminacy sources and aims to solve a problem of compliance to rank correlation among different distribution type random variables caused by access of multiple types of new energy to a power grid, such as wind energy and solar energy. According to the method, probabilistic power flow analysis on an AC-DC hybrid power grid is carried out, and thereby safe and reliable operation is guaranteed.

Description

technical field [0001] The invention relates to new energy grid-connected technology, in particular to the calculation of the probabilistic power flow of the AC-DC hybrid grid after the new energy is incorporated. Background technique [0002] With the development of renewable energy power generation technology, the problem of connecting a large number of renewable energy sources with strong uncertainties to the grid has also emerged. These "strong uncertainties" will bring huge challenges to the stable operation of the power system. [0003] A high voltage DC (Voltage Source Converter based High Voltage Direct Current, VSC-HVDC) system based on a voltage source converter has been proven to be a good solution because it can independently control active / reactive power and support bidirectional flow of power, And can provide voltage support for the large power grid. In the AC / DC hybrid grid, the deterministic power flow (Deterministic Power Flow, DPF) calculation method has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 唐俊杰彭穗彭志云
Owner CHONGQING UNIV
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