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Method for calculating distribution network flow

A technology for power flow calculation and distribution network, which is applied in electrical components, circuit devices, AC network circuits, etc., and can solve problems such as low accuracy and convergence.

Active Publication Date: 2015-09-30
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems of low precision and low convergence in the distribution network power flow calculation in the prior art, and provide a distribution network power flow calculation method with high calculation accuracy, good convergence and fast calculation speed

Method used

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Experimental program
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Embodiment 1

[0057] Embodiment 1: The purpose of the present invention is to overcome the inaccuracy and convergence of the distribution network power flow calculation in the prior art.

[0058] To solve the high problem, provide a distribution network power flow calculation method with high calculation accuracy, good convergence and fast calculation speed. include the following

[0059] step:

[0060] S1: determine the number M of connected branches and the number of nodes N, according to the number M of connected branches and the number N of nodes, and form a node-branch association matrix A=[A t , A l ], where A t is an N×N order invertible matrix (node-branch (tree branch) incidence matrix) formed based on the selected tree, A l It is an N×M order matrix (section-branch (connected branch) correlation matrix), the element a of matrix A ij is defined as follows:

[0061] The branches include connecting branches and tree branches; the value range of i is 1 to N, and the value range ...

Embodiment 2

[0101] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in this embodiment, further, considering that the voltage of each node is close to 1 in practice, each node U can be set to in_i ≈U out_i ≈1, then, in formula (8)

[0102]

[0103]

[0104] Among them, when the distribution network topology remains unchanged, R′ Σcon , R″ Σcon , X' Σcon , X″ Σcon Both are constant matrices determined by the resistance and reactance of each tree branch and connecting branch.

[0105] The calculation accuracy of the distribution network power flow calculation method provided by the two embodiments of the present invention will be described below through data. First, choose a figure 2 The power distribution network of 33 busbars and 5 loops shown and such as image 3 The power distribution network of 69 buses and 5 loops shown is calculated and analyzed. As shown in Table 1, six configurations are selected for calculation and analysis. Using the a...

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Abstract

The invention relates to the field of distribution network application management of electrical power systems, in particular to a method for calculating the distribution network flow. In the method, a power flow is adopted as a variable, and through the adoption of the method, loop power, transformer branches, multi-balance buses and multi-PV buses are directly calculated separately or together. In the method, the power flow is adopted as the variable, so that the method has relatively high calculating efficiency.

Description

technical field [0001] The invention relates to the field of application management of power system distribution network, in particular to a method for calculating power flow of distribution network. Background technique [0002] Distribution system power flow calculation is an important basis for distribution network economic operation and system analysis. Common methods include implicit Z bus Gaussian method, modified Newton method, modified fast decoupling method, and forward-backward substitution method. In addition, the access of a large number of distributed power sources to the distribution network has a great impact on the voltage, power flow and network loss of the distribution network. Therefore, the analysis and control of power distribution system become more complicated, and the role of power flow algorithm becomes more important. Currently, the cow-pull method and its improved algorithm are still the first choice for various commercial software to solve power...

Claims

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Application Information

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IPC IPC(8): H02J3/00
Inventor 李红伟张安安陈贵沈霞方玮吴华兵孔岱
Owner SOUTHWEST PETROLEUM UNIV