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Power flow calculation method for medium and low voltage active distribution network with three-phase unbalanced ring network

An active distribution network, low-voltage technology, applied in the direction of multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, AC network with the same frequency from different sources, etc., to achieve the effect of optimal configuration

Active Publication Date: 2021-01-01
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Up to now, no power flow processing has fully considered the new characteristics of distribution network such as three-phase unbalance, multi-voltage levels, distributed power generation and weak ring network.

Method used

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  • Power flow calculation method for medium and low voltage active distribution network with three-phase unbalanced ring network
  • Power flow calculation method for medium and low voltage active distribution network with three-phase unbalanced ring network
  • Power flow calculation method for medium and low voltage active distribution network with three-phase unbalanced ring network

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specific Embodiment

[0107] Specific examples include the following electricity-heat combined systems:

[0108] Such as figure 1 The shown three-phase unbalanced medium and low voltage active distribution network with ring network consists of six nodes. Among them, there are six nodes, node 1 represents the upper power supply transformer, which is the source node; node 2, node 3 and node 6 are all nodes of the medium voltage distribution network; node 3 and node 6 are connected through a ring network; node 3 and node There is a distribution transformer between node 4, and its connection mode is Dyn11; node 4 and node 5 are low-voltage distribution network nodes;

[0109] And the known basic network data of the power grid and heating network are:

[0110] Number of power nodes: 5;

[0111] Line parameters: line unit length resistance 3.7Ω / km, line unit length reactance 0.369Ω / km

[0112] Route length: Route 12: 0.01km; Route 23: 0.01km; Route 26: 0.01km; Route 45: 0.01km

[0113] Rated voltage...

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Abstract

The invention discloses a power flow calculation method for a three-phase imbalanced medium-and-low-voltage active distribution network with a looped network. The method comprises: for the three-phaseimbalanced medium-and-low-voltage active distribution network with the looped network, acquiring known basic network data; by a virtual current compensation method, decomposing the looped network into a decomposed looped network; obtaining the power flow post-voltage of various nodes in a power grid after power flow iteration; performing power flow iterations continuously, and calculating, aftereach power flow iteration, the maximum value of the voltage differences of the nodes in the power grid before and after the power flow iteration: and determining until the requirements are satisfied so as to complete the power flow processing. The method of the invention can process the looped imbalanced network in the three-phase imbalanced medium-and-low-voltage active distribution network, performs calculation quickly, occupies small memory, has high power flow result accuracy, can optimize the construction of the three-phase imbalanced medium-and-low-voltage active distribution network, and provide accurate data for grid dispatch.

Description

technical field [0001] The invention belongs to the field of distribution network power flow processing, and relates to a method for calculating the power flow of a medium-voltage and low-voltage active distribution network including a three-phase unbalanced ring network. Background technique [0002] Power flow processing is the basis for managing and planning the distribution network and realizing safe, stable and economical operation. In recent years, with the continuous progress and application of technologies such as energy and power, "cloud big things, smart things", etc., the integration of distributed power and ubiquitous power Internet of Things is getting higher and higher. With the rapid and massive access of distributed power sources such as wind and light, the traditional passive distribution network is transforming into an active and active distribution network. While bringing significant environmental, economic and social benefits, it also brings new challeng...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/26H02J3/06
CPCH02J3/06H02J3/26Y02E40/50
Inventor 周晓鸣丁一
Owner ZHEJIANG UNIV
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