Calculation method of power flow for three-phase unbalanced medium and low voltage complete distribution network with ring network

A low-voltage distribution network and distribution network technology, applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, and the AC network with the same frequency from different sources, etc., to achieve the effect of optimizing the optimal configuration

Active Publication Date: 2020-12-08
ZHEJIANG UNIV
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  • Summary
  • 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, multiple voltage levels and weak ring network

Method used

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  • Calculation method of power flow for three-phase unbalanced medium and low voltage complete distribution network with ring network
  • Calculation method of power flow for three-phase unbalanced medium and low voltage complete distribution network with ring network
  • Calculation method of power flow for three-phase unbalanced medium and low voltage complete distribution network with ring network

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specific Embodiment

[0105] Specific examples include the following electricity-heat combined systems:

[0106] Such as figure 1 The shown three-phase unbalanced medium and low voltage complete distribution network with ring network consists of six nodes. Among them, there are six nodes. Node 1 represents the upper power supply transformer and is the source node; Node 2, Node 3 and Node 6 are load nodes of the medium-voltage distribution network; Node 3 and Node 6 are connected through a ring network; Node 3 There is a distribution transformer between node 4 and its connection mode is Dyn11; node 4 and node 5 are load nodes of low-voltage distribution network;

[0107] And the known basic network data of the power grid and heating network are:

[0108] Number of power nodes: 5;

[0109] Line parameters: line unit length resistance 3.7Ω / km, line unit length reactance 0.369Ω / km

[0110] Route length: Route 12: 0.01km; Route 23: 0.01km; Route 26: 0.01km; Route 45: 0.01km

[0111] Rated voltage o...

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Abstract

The invention discloses a power flow calculation method for a three-phase unbalanced medium-low voltage complete power distribution network containing a ring network. The method comprises the steps ofobtaining known basic network data in allusion to the three-phase unbalanced medium-low voltage complete power distribution network containing the ring network, splitting the ring network into a split ring network according to a virtual current compensation method, processing to obtain the post-power flow voltage of each node in the power grid after power flow iteration, continuing the power flowprocessing iteration, calculating the maximum value of the voltage difference of all nodes in the power grid before and after the power flow iteration after each time of power flow iteration; and performing judgment until requirements are met so as to complete the power flow processing. According to the method, the annular unbalanced network in the three-phase unbalanced medium-low voltage complete power distribution network can be processed, calculation processing can be carried out more quickly, the occupied memory is small, the accuracy of the power flow result is good, the construction ofthe three-phase unbalanced medium-low voltage complete power distribution network can be optimized, and accurate data can be provided for power grid dispatching.

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 three-phase unbalanced medium-low voltage complete distribution network including a 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 challenges to the ...

Claims

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Application Information

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IPC IPC(8): H02J3/26H02J3/06
CPCH02J3/06H02J3/26Y02E40/50
Inventor 周晓鸣丁一
Owner ZHEJIANG UNIV
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