Two-stage method-based main network and distribution network integrated distributed state estimation method

Abstract

The present invention relates to a two-stage method-based main network and distribution network integrated distributed state estimation method. The method includes the following steps that: a main network and distribution network integrated state estimation model is built; the distribution network model of the main network and distribution network integrated state estimation model is decoupled into a plurality of sub systems; a linear relationship between the state quantities of a main network and a distribution network before decoupling and state quantities in the sub systems after decoupling is built; state estimation is independently carried out on the sub systems in a distributed manner after decoupling; with the linear relationship of the state quantities of the main network and the distribution network before and after decoupling adopted as a measurement equation, a state estimation model is built to carry out state estimation, and the integrated state of the main network and the distribution network can be obtained. With the method provided by the invention adopted, the amount of computation can be reduced, the problem of curse of dimensionality of main network and distribution network integrated state estimation which is caused by large scale of the distribution network can be solved effectively and accurately; consistent and accurate real-time state of the main network and the distribution network can be obtained; basic data can be provided for the analysis and calculation of main network and distribution network integration; and the operational reliability of main network and distribution network integration can be improved.

Description

technical field [0001] The invention relates to the field of distribution automation, in particular to a method for estimating a distributed state of an integrated main distribution network based on a two-stage method. Background technique [0002] The combination of distributed power and conventional power will be the development trend of the power system. The access of a large number of distributed power has changed the characteristics of the distribution network. Based on the boundary equivalent, the main network and the distribution network are independently operated, analyzed and controlled. The method is no longer applicable, and it is necessary to consider the overall integration of the main distribution network and conduct an integrated analysis of the main distribution network. [0003] Distributed state estimation makes use of the characteristics of the state estimation algorithm itself that can be divided into regions to perform state estimation in each region, an...

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Problems solved by technology

[0008] In view of this, the present invention provides a method for estimating the integrated distributed state of the main distribution network based on the two-stage method, which reduces the amount of calculation and effectively and accurately solves the The integrated state estimates the problem of dimension disaster, and can obtain the consistent and accurate real-time state of the main distribution network, and provide basic data for the analysis and calculation of the main distribution network integration, thereby improving the operational reliability of the main distribution network integration

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