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Analytic probabilistic load flow calculation method and system

A probabilistic power flow calculation and analytical technique, which is applied in the field of analytical probabilistic power flow calculation methods and systems, and can solve problems such as slow operation speed and low calculation accuracy.

Active Publication Date: 2020-07-28
SHANGHAI MUNICIPAL ELECTRIC POWER CO +1
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Problems solved by technology

[0013] The embodiment of the present invention provides an analytical probabilistic power flow calculation method and system, which is used to solve or effectively alleviate the defects of low calculation accuracy and slow operation speed in the process of probability power flow calculation after distributed power sources are connected to the system in the prior art

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  • Analytic probabilistic load flow calculation method and system
  • Analytic probabilistic load flow calculation method and system
  • Analytic probabilistic load flow calculation method and system

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Embodiment Construction

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0055] Before introducing the embodiments of the present invention, first the relevant technical features used in the embodiments of the present invention are described as follows:

[0056] About Gaussian distribution and Gaussian mixture model: The Gaussian distribution (Gaussian distribution) when the random variable is one-dimensional, also kno...

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Abstract

The embodiment of the invention provides an analytic probabilistic load flow calculation method and system. The analytic probabilistic load flow calculation method comprises steps of obtaining historical data of injection power of a distributed power supply access node; fitting the historical data by using a Gaussian mixture model to obtain a joint probability density function of the injection power; obtaining a second-order approximate expansion equation of a node voltage and injection power corresponding to each component; and performing weighted summation of the probability distribution function of the corresponding target node voltage when the injection power obeys the Gaussian distribution of each component to obtain the probability distribution function of the target node voltage, and solving the probability distribution function of the branch power flow similarly. The method is advantaged in that uncertainty of the output of the distributed power supply is fitted through a Gaussian mixture model, the correlation between outputs of the distributed power supply is considered, and accuracy of uncertainty modeling is improved; a second-order Taylor expansion formula is adopted to approximate the nonlinear implicit function relationship among node voltage, branch power flow and injection node power, nonlinearity of an equation is considered, and the calculation speed and result precision are improved.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of power grids, and in particular to an analytical probabilistic power flow calculation method and system. Background technique [0002] With the continuous expansion of the grid scale, the continuous increase of the voltage level and the continuous increase of the transmission distance, the impact of the voltage stability problem on the power system is increasing. Due to the fluctuation and intermittent characteristics of distributed power generation based on renewable energy, its large-scale integration into the distribution network enhances the uncertainty and randomness of the distribution network. Among them, the uncertainty in the power grid can be modeled by a probabilistic model, and the probabilistic power flow calculation method can be used to analyze the operation of distributed power generation after it is connected to the grid. [0003] For the modeling of distributed gene...

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06
Inventor 时珊珊周健沈冰魏新迟袁沐琛陈颖关慧哲
Owner SHANGHAI MUNICIPAL ELECTRIC POWER CO
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