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Relative distance measurement-based power distribution network interval load flow calculation method

A technology of interval power flow and relative distance, applied to AC networks, electrical components, circuit devices, etc. of the same frequency with different sources, it can solve the influence of the accuracy of the results, and it is difficult to obtain the probability distribution of fuzzy state variables and uncertain quantities. , difficult to apply and other problems, to achieve the effect of simplifying the difficulty of solving, reducing the number of iterations required, high application value and advantages

Pending Publication Date: 2021-07-20
STATE GRID CORP OF CHINA +2
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Problems solved by technology

The difficulty of the algorithm is that it is difficult to obtain the breaking point of the possibility distribution of fuzzy state variables and uncertain quantities (ie membership density function), which affects the accuracy of the results, and the result of this method is also in the form of membership density function, which is difficult to apply

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  • Relative distance measurement-based power distribution network interval load flow calculation method
  • Relative distance measurement-based power distribution network interval load flow calculation method
  • Relative distance measurement-based power distribution network interval load flow calculation method

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Embodiment Construction

[0075] The present invention proposes a distribution network interval power flow calculation method based on relative distance measurement, comprising the following steps:

[0076] 1) According to the forward-backward substitution method, a three-phase unbalanced power flow model of the distribution network is established. The model specifically includes the following constraints:

[0077] 1-1) Node power balance constraint;

[0078]

[0079] Among them, P j(s) is the injected active power of phase s at node j; Q j(s) is the injected reactive power of phase s at node j; is the real injection current of phase s in branch jk; is the imaginary part injection current of phase s in branch jk; e j(s) is the real part of the voltage of phase s at node j; f j(s) is the imaginary part of the voltage of phase s at node j; V j(s) is the square of the voltage amplitude of phase s at node j, s=a,b,c;

[0080] 1-2) Node voltage constraints;

[0081]

[0082] in, is the squ...

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Abstract

The invention provides a power distribution network interval load flow calculation method based on relative distance measurement, and belongs to the field of power system power distribution network interval load flow calculation. The method comprises the following steps: firstly, establishing a three-phase unbalanced power flow model of the power distribution network, converting parameters in the model into a corresponding RDM (Relative Distance Measurement) variable form, and further converting the power flow model into a power distribution network interval power flow calculation model in the RDM form; and solving the converted model through a linear programming contraction method to obtain the interval range of each RDM variable, and finally obtaining the upper and lower limits of each parameter in the power flow model, thereby completing the power flow calculation. The interval load flow calculation method meets the requirements of accuracy of interval results of the power distribution network and reduction of conservative property while solving the problem of three-phase unbalanced operation of the power distribution network, and is high in precision and reliability.

Description

technical field [0001] The invention belongs to the field of power flow calculation in distribution network intervals of electric power systems, and in particular relates to a method for calculating power flow in distribution network intervals based on relative distance measurement. Background technique [0002] Renewable energy is now a mainstream option for the power sector in almost all regions of the world. As of 2018, according to statistics, more than 90 countries have installed more than 1GW of renewable energy generation capacity, and 30 countries have more than 10GW. Meanwhile, 2018 was also the fourth consecutive year that installed more renewable energy generation than fossil fuels and nuclear combined, with renewables now accounting for more than one-third of global electricity generation. Furthermore, renewable energy generation capacity is forecast to grow by 50% between 2019 and 2024, with China accounting for 40% of global renewable energy capacity growth ov...

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Application Information

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IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10H02J2203/20
Inventor 吴文传李晨吴越强赵瑞娜孙宏斌王云丽王彬路轶杜成锐倪山
Owner STATE GRID CORP OF CHINA
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