Improved method of power grid interval power flow considering interval correlation

A technology of interval power flow and correlation, applied to AC networks, circuit devices, AC network circuits with different sources of the same frequency, etc., can solve the problems of amplifying the feasible region of nonlinear optimization, solving deviation, ignoring variable correlation, etc. Achieve the effect of accurate power flow calculation, accurate reference, and enhanced constraint conditions for uncertain power flow

Active Publication Date: 2019-04-26
WUHAN UNIV
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Problems solved by technology

However, in the current interval power flow calculation based on affine, the constraints only consider the general power system laws, and ignore the possible correlation between variables, which will invisibly enlarge the feasible region of nonlinear optimization and may cause the solution deviation from

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  • Improved method of power grid interval power flow considering interval correlation
  • Improved method of power grid interval power flow considering interval correlation
  • Improved method of power grid interval power flow considering interval correlation

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Embodiment Construction

[0039] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0040] In this embodiment, the correlation of variables is used to enhance the constraint conditions of the nonlinear optimization problem, as an improvement plan and a new solution is proposed, so that the interval solution of the grid interval power flow calculation is more accurate.

[0041] This embodiment is realized through the following technical solutions, an interval power flow improvement method considering interval correlation, and its implementation steps are as follows:

[0042] Step 1. Input power system parameters, mainly including node load consumption power, node generator injection power, reference voltage, reference power, branch impedance, injection power fluctuation range, relevant node numbers and size of relationship book;

[0043] Step 2: Using the affine algorithm to convert the interval power flow into a nonlinear optimization...

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Abstract

The invention belongs to the technical field of electrical power system interval power flow calculation, and particularly relates to an improved method of a power grid interval power flow consideringinterval correlation. The improved method includes the steps that electrical power system parameters are input; an affine algorithm is used for transforming the interval power flow into a nonlinear optimization problem; output variables X and X<j> of the nth pair generator with correlation is selected; a parallelogram model among related variables is established; the parallelogram model is converted into inequality constraint conditions in the analytical form; n=n+1, the conditions that if n>=N, the next step is executed; and if not, the previous step is returned are judged; and power flowequation constraints and correlation constraints are simultaneous, and a nonlinear optimization algorithm is used for solving the interval flow. According to the improved method of the power grid interval power flow considering interval correlation, correlation between the variables in an electrical power system is considered, uncertain power flow calculation is more accurate, and more accurate reference is provided for electrical power system scheduling.

Description

technical field [0001] The invention belongs to the technical field of electric power system section power flow calculation, and in particular relates to a method for improving power grid section power flow considering section correlation. Background technique [0002] During the operation of the actual power system, both the load and the injected power of the nodes are constantly fluctuating, which leads to the uncertainty of the power flow calculation of the power system and poses a challenge to the dispatching planning of the power grid. There are generally three methods for dealing with uncertainties: random theory, fuzzy set theory and interval analysis. Among them, interval analysis does not need to know the probability density function or membership function of uncertain parameters, and the calculation process is simple, so interval analysis is widely used in uncertain power flow calculations. The initial interval power flow calculation is to bring the interval numbe...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20Y04S10/50
Inventor 冷仕鹏冉晓洪刘开培陈书瑶张珣玥李思伟
Owner WUHAN UNIV
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