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Node current injection based single three-phase hybrid tide calculation method

A technology of power flow calculation and node current, applied in calculation, circuit devices, AC network circuits, etc., can solve the problems of insufficient modeling flexibility, affecting algorithm convergence, etc., and achieve the effect of reducing dimension, reducing dimension and ensuring accuracy.

Active Publication Date: 2018-06-08
ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO +2
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Problems solved by technology

Therefore, for the three-sequence decoupling problem, some methods realize the three-sequence decoupling through the current compensation method, but the degree of network imbalance and the ratio of R / X greatly affect the convergence of the algorithm, and the flexibility of modeling is insufficient.

Method used

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  • Node current injection based single three-phase hybrid tide calculation method
  • Node current injection based single three-phase hybrid tide calculation method
  • Node current injection based single three-phase hybrid tide calculation method

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Embodiment Construction

[0024] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0025] A single-phase three-phase mixed power flow calculation method based on node current injection, comprising the following steps:

[0026] Step 1. Build as figure 1 The single-phase and three-phase hybrid model for distribution network power flow calculation is shown;

[0027] The concrete steps of described step 1 include:

[0028] (1) According to the three-phase symmetry, the distribution network is divided into three-phase symmetrical network with better symmetry and three-phase asymmetrical network with obvious asymmetry, and the three-phase symmetrical network with better symmetry is analyzed by single-phase power flow. Three-phase power flow analysis is adopted for the three-phase asymmetric network in the obvious part of asymmetry.

[0029] In this example, if figure 1 As shown, E is the three-phase symmetrical node set in the sing...

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Abstract

The invention relates to a node current injection based single three-phase hybrid tide calculation method. The technical feature of the method is that the method includes steps of 1, constructing a single three-phase hybrid model used for power distribution network tide calculation; 2, performing power distribution network calculation by adopting a node current injection method based on the singlethree-phase hybrid model used for power distribution network tide calculation constructed in step 1. According to the invention, influence due to zero sequence and negative sequence components are taken into account, and calculation precision is ensured at the same time of ensuring the calculation speed.

Description

technical field [0001] The invention belongs to the technical field of power system power flow operation, and relates to a single-three-phase mixed power flow algorithm, in particular to a single-three-phase mixed power flow calculation method based on node current injection. Background technique [0002] The power flow calculation of distribution network is an important content of distribution network analysis, and it is also an important basis for the rationality, reliability and economic analysis of distribution network planning and operation. In the power flow analysis of the high-voltage system, since the three-phase loads are basically the same, and the line mode of alternating phases is adopted, it can be regarded as a three-phase balance, and is generally calculated according to the single-phase power flow. However, the asymmetric three-phase parameters of the distribution network and the unbalanced three-phase load make the power flow calculation of the distribution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/06G06F17/50
CPCG06F30/367H02J3/06H02J2203/20Y02E60/00
Inventor 王旭东丁一马世乾黄潇潇霍现旭庄剑李国栋项添春林济铿王高猛
Owner ELECTRIC POWER SCI & RES INST OF STATE GRID TIANJIN ELECTRIC POWER CO
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