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A Calculation Method of Probabilistic Power Flow in Power System Based on Multiple Random Variables

A technology of random variables and probabilistic power flow, which is applied to AC networks, circuit devices, and AC network circuits of the same frequency with different sources, and can solve the problems of linearization error, series expansion error, slow calculation speed, etc.

Active Publication Date: 2019-01-29
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

Although the semi-invariant method has many advantages above, it still has the following two kinds of errors: 1) linearization error
The nonlinear power flow equation is linearized by Taylor series expansion ignoring higher-order terms, and the process produces linearization errors
2) Series expansion error
However, the above three probabilistic power flow algorithms have large calculation errors when considering the power system probabilistic power flow problems with continuous and discrete random variables at the same time.
Moreover, the existing probabilistic power flow algorithm has low calculation accuracy and slow calculation speed

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  • A Calculation Method of Probabilistic Power Flow in Power System Based on Multiple Random Variables
  • A Calculation Method of Probabilistic Power Flow in Power System Based on Multiple Random Variables
  • A Calculation Method of Probabilistic Power Flow in Power System Based on Multiple Random Variables

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[0034] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further elaborated below in conjunction with the accompanying drawings.

[0035] In embodiment one, see figure 1 As shown, the present invention proposes a calculation method of the power system probability flow based on various random variables, including steps:

[0036] S100, using the semi-invariant method to calculate the power flow response generated by the continuous random variable;

[0037] S200, using multiple deterministic power flows to calculate power flow responses generated by discrete random variables;

[0038] S300, performing convolution processing on the calculation results of the above two steps to obtain the power flow response when continuous and discrete random variables act together.

[0039] The specific technical scheme is as follows:

[0040] S100. Using the semi-invariant method to calculate the power flow response...

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Abstract

The invention discloses a method for calculating the probability power flow of a power system based on various random variables, comprising the steps of: S100, using the semi-invariant method to calculate the power flow response generated by the continuous random variable; S200, using multiple deterministic power flows to calculate the discrete power flow The power flow response generated by random variables; S300, perform convolution processing on the calculation results of the above two steps to obtain the power flow response when continuous and discrete random variables act together. The invention can simultaneously consider the operation of continuous and discrete random variables in the power system probability flow calculation, and has high calculation accuracy and fast calculation speed.

Description

technical field [0001] The invention belongs to the technical field of power system power flow calculation, in particular to a calculation method of power system probability flow based on various random variables. Background technique [0002] Probabilistic power flow is a probabilistic analysis method for effectively studying the influence of random factors on power systems. Its concept was first proposed by Borkwska in 1974. In actual power system operation, changes in weather conditions or human operations produce many random factors, such as: load fluctuations, fluctuations in photovoltaic, wind power, and fuel cell output. Deterministic power flow calculation cannot comprehensively analyze the impact of random factors on power system operation. On the contrary, the probability power flow can fully consider random factors, and easily obtain the probability distribution and statistical characteristics of the power flow response (node ​​voltage, branch power flow). There...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 郭智祺张雪霞陈维荣
Owner SOUTHWEST JIAOTONG UNIV
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