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Uncertain power flow calculation method based on hybrid random and interval variables

A technology of interval variable and power flow calculation, applied to AC networks with the same frequency from different sources, etc., can solve the problems of conservative and model rash.

Pending Publication Date: 2019-10-25
ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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Problems solved by technology

[0008] The purpose of the present invention is to provide an uncertain power flow calculation method with mixed random and interval variables, thereby overcoming the shortcomings of the existing probabilistic power flow or interval power flow models that inevitably have the problem of aggressiveness or conservatism

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  • Uncertain power flow calculation method based on hybrid random and interval variables
  • Uncertain power flow calculation method based on hybrid random and interval variables
  • Uncertain power flow calculation method based on hybrid random and interval variables

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Embodiment Construction

[0061] The technical solutions in the present invention are clearly and completely described below in conjunction with the accompanying drawings in the calculation examples of the present invention. Obviously, the calculation examples described are only part of the calculation examples of the present invention, not all of the calculation examples. Based on the calculation examples in the present invention, all other calculation examples obtained by persons of ordinary skill in the art without creative work belong to the scope of protection of the present invention.

[0062] Write a program on the Matlab R2015b platform to realize the model construction and verification of a mixed random and interval variable uncertain power flow calculation method of the present invention. The CPU main frequency of the computer platform used is 3.2GHz×4, and the internal memory is 8GB. Table 1 shows the parameters of the four wind farms, which are respectively connected to nodes 7, 8, 12, and 1...

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Abstract

The invention discloses an uncertain power flow calculation method based on hybrid random and interval variables, which relates to the technical field of power system voltage stabilization. The methodincludes the following steps: natural factors such as wind speed and light intensity are expressed as interval variables, and a wind power generation interval model, a photovoltaic power generation interval model and a node load probability model are constructed; the wind power generation interval model, the photovoltaic power generation interval model and the node load probability model are introduced into a power flow equation, and a power flow model based on hybrid random and interval variables is established; and calculation is performed on the power flow model based on hybrid random andinterval variables by adopting a double-layer Monte Carlo method to obtain the maximum and minimum cumulative probability distribution of power flow, and thus, the probability interval of power flow exceeding the limit is determined. By using the method of the invention, the maximum cumulative probability distribution and the minimum cumulative probability distribution of power flow can be obtained, and thus, the probability interval of power flow exceeding the limit can be determined.

Description

technical field [0001] The invention belongs to the technical field of power system voltage stabilization, and in particular relates to an uncertain power flow calculation method considering mixed random and interval variables of wind power and photovoltaic power generation. Background technique [0002] Power flow calculation is the basis of power system steady-state analysis. In recent years, the proportion of wind power, solar power and other new energy power generation in the power generation side of the power system has increased year by year. While optimizing the primary energy structure of the power generation side, it also brings more uncertain factors to the power system. Uncertain power flow calculation is an important means to analyze the influence of these uncertain factors on the steady-state operation of the power system. [0003] At present, there are mainly three types of uncertain power flows proposed by existing studies: probability flows, fuzzy flows and ...

Claims

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 郭小璇孙乐平杨艺云韩帅吴宛潞肖静吴宁冯玉斌
Owner ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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