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Three-phase power flow calculation method for low-voltage distribution network based on phase sequence hybrid method

A low-voltage distribution network and three-phase power flow technology, which is applied to AC networks with the same frequency from different sources, electrical components, etc., can solve problems such as load asymmetry and low-voltage distribution network topology asymmetry

Active Publication Date: 2022-07-22
HANGZHOU DIANZI UNIV
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Problems solved by technology

Due to the large number of single-phase users in the low-voltage distribution network, the topology of the low-voltage distribution network is asymmetrical, and the load itself is also asymmetrical, so it is difficult to apply the symmetrical component method to the low-voltage distribution network.

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  • Three-phase power flow calculation method for low-voltage distribution network based on phase sequence hybrid method
  • Three-phase power flow calculation method for low-voltage distribution network based on phase sequence hybrid method
  • Three-phase power flow calculation method for low-voltage distribution network based on phase sequence hybrid method

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Embodiment Construction

[0069] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific implementation manners.

[0070] Step 1: Equivalent the single-phase node to the upper three-phase node

[0071] 1.1 Node Equivalent Method

[0072] The end of the low-voltage distribution network is connected to the user's load, and the topology usually results in asymmetric network parameters due to the existence of single-phase users and three-phase users, which makes the decoupling of the symmetrical component method fail. The phase sequence hybrid method can be used to solve the power flow of the low-voltage distribution network, that is, the distribution of single-phase users is scattered, and there is no coupling between lines. calculate.

[0073] Figure 1(a) shows the 9-node distribution network topology, in which the black solid circle represents the main line node, the figure is node 0-5; ...

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Abstract

The invention discloses a three-phase power flow calculation method for a low-voltage distribution network based on a phase sequence hybrid method. The invention firstly converts the single-phase node to the three-phase node to form a three-phase symmetrical low-voltage power distribution network in the phase component model, and secondly, the phase component model parameters of the power distribution network are converted into sequence component model parameters, and the forward-derivation method is adopted. Carry out the power flow calculation, and then convert the obtained power flow results into a phase component model, and finally solve the single-phase node power flow through the previous equivalent three-phase node power flow results and parameters. The method of the invention adopts the phase component method for the asymmetric part and the sequence component method for the symmetrical part, so that the low-voltage distribution network can also use the symmetrical component method, and the number of nodes involved in the power flow calculation is reduced in the solution process, and the single-phase node The larger the number, the better the dimensionality reduction effect and the faster the power flow calculation.

Description

technical field [0001] The invention belongs to the field of power system power flow calculation, relates to a power flow calculation method for a low-voltage station area distribution network, and in particular relates to a three-phase power flow calculation method for a low-voltage distribution network based on a phase sequence hybrid method. Background technique [0002] The symmetric component method, also known as the sequence component method, was proposed by Fortescue in 1918 and proved that any set of asymmetric n-dimensional phasors can be converted into n-1 n-dimensional symmetric sequence components and 1 zero-sequence component. It is a basic method to analyze the asymmetric operation state of symmetrical systems in power systems. [0003] The power flow calculation of the low-voltage distribution network is to analyze whether the structure of the low-voltage distribution network is reasonable and whether the power distribution of users is reasonable, and provide...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/10
Inventor 章坚民夏燕
Owner HANGZHOU DIANZI UNIV
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