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Three-phase load flow distribution determining method on single-phase load and inter-phase load mixed situation

A three-phase power flow, single-phase load technology, applied in the direction of reducing the asymmetry of the multi-phase network, eliminating/reducing the asymmetry of the multi-phase network, etc. Prominent phase imbalance, large number of nodes, etc.

Active Publication Date: 2013-12-11
STATE GRID CORP OF CHINA +2
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Problems solved by technology

[0003] The distribution network has many characteristics different from the transmission network, such as open-loop operation (closed-loop design, radial operation), prominent three-phase unbalance, large ratio of line resistance to reactance, large number of nodes, etc. In addition, with the distributed Due to the different ways of power grid connection and the wide application of different power supply modes of single-phase and three-phase, the three-phase power flow of the distribution network should not be calculated by the traditional processing method equivalent to single-phase

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  • Three-phase load flow distribution determining method on single-phase load and inter-phase load mixed situation
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  • Three-phase load flow distribution determining method on single-phase load and inter-phase load mixed situation

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Embodiment Construction

[0066] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0067] In view of the diversification of load access modes in the distribution network, this embodiment proposes a method for determining the three-phase power flow distribution in the case of mixed single-phase load and inter-phase load. In the case of the results and the load connection mode of each node, the equivalent transformation method is used to obtain the equivalent output power of each phase on the medium voltage side, and then the three-phase power flow calculation method based on the neutral point voltage offset is used to obtain the power flow distributed. The general idea is as follows figure 1 shown.

[0068] First obtain the network topology, the load size of the low-voltage side of each node, and the load connection method, and then convert the load equivalent of the low-voltage side according to diff...

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Abstract

The invention provides a three-phase load flow distribution determining method on a single-phase load and inter-phase load mixed situation. The method includes the steps of obtaining low-voltage side load magnitude and load access modes of a network topology and nodes, then carrying out equivalent conversion on the low-voltage side load according to the different access modes, obtaining the output power of each phase of a medium-voltage side, and finally obtaining three-phase load flow distribution by means of a three-phase load flow distribution calculation method based on neutral point voltage excursion. The method solves the load flow calculation problem on the situation that the load access modes in a power distribution network are inconsistent through equivalent conversion, is suitable for obtaining three-phase load flow distribution of the power distribution network on the single-phase load and inter-phase load mixed situation, and enables analysis results of operation of the power distribution network to be more accurate.

Description

technical field [0001] The invention belongs to the technical field of distribution network operation control, and in particular relates to a method for determining three-phase power flow distribution in the case of mixed single-phase load and interphase load. Background technique [0002] Power flow calculation is the basis of distribution network planning, operation analysis, control and optimization, and is the most basic and important calculation of distribution network. With the vigorous development of my country's national economy, the increase of load diversity and the inconsistency of distributed power access to distribution network, the research on three-phase power flow calculation of distribution network has attracted more and more attention. [0003] The distribution network has many characteristics different from the transmission network, such as open-loop operation (closed-loop design, radial operation), prominent three-phase unbalance, large ratio of line resi...

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Application Information

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IPC IPC(8): H02J3/26
CPCY02E40/50
Inventor 胡丽娟盛万兴宋晓辉孟晓丽李建芳史常凯
Owner STATE GRID CORP OF CHINA
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