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State estimation method considering outer net extension Ward equivalent

A state estimation and external network technology, applied in computing, AC network circuits, instruments, etc., can solve the problems of state quantity correction, not considering the influence of external network topology state estimation, etc., to improve the accuracy and increase the constraint relationship. Effect

Active Publication Date: 2017-05-31
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD +1
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Problems solved by technology

[0004] Based on this, at present, when performing state estimation on independent subnets based on quantity measurement in actual power systems, the external network is often treated as a way of hanging equivalent machines, and the influence of the topology structure of the external network on the state estimation of the internal network is not considered. , so it is not possible to correct the state quantity in time when the internal network contains bad data

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  • State estimation method considering outer net extension Ward equivalent
  • State estimation method considering outer net extension Ward equivalent
  • State estimation method considering outer net extension Ward equivalent

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[0058] The present invention will be further described below in conjunction with the examples, but it should not be understood that the scope of the subject of the present invention is limited to the following examples. Without departing from the above-mentioned technical ideas of the present invention, various replacements and changes made according to common technical knowledge and conventional means in this field shall be included in the protection scope of the present invention.

[0059] A method for estimating the Ward equivalent in consideration of extranet extensions. The specific steps in an embodiment are as follows:

[0060] (1) Use standard system data to simulate internal and external network and SCADA measurement

[0061] Taking the IEEE 39-node system as an example, its nodes 3 and 17 are used as boundary points, nodes 1, 2, 25-30, and 37-39 are used as external network nodes, and the remaining nodes are internal network nodes. Branches 9-39 are disconnected at t...

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Abstract

By aiming at the defects of the existing outer net state estimation considering research method, the invention provides a state estimation method considering an outer net extension Ward equivalent. The method comprises the concrete steps of reading in electric net parameters and SCADA (supervisory control and data acquisition) measuring data; building an extension Ward equivalent model by combining outer net typical section network information; forming new measuring information by considering the outer net extension Ward model; singly performing weighted least square state estimation with equality constraint on an inner net.

Description

technical field [0001] The invention belongs to the field of electric power system scheduling automation, in particular to a state estimation method considering the extended Ward equivalent of the external network. Background technique [0002] Power system state estimation is an important part of EMS, which has a direct impact on the dispatching decision of the power grid, and can improve the safety and economic operation level of the power system. Its main task is to calculate the raw data according to the best estimation criterion to obtain the best estimated value of the grid state quantity. [0003] my country's power system is mainly composed of two major power grids - the State Grid and the Southern Power Grid, in addition to some small-scale regional power grids, such as the Hong Kong Power Grid and the Macau Power Grid. There is a competitive relationship between the two major power grids and the small-scale regional power grid. The topological structure and operat...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06Q50/06
CPCG06Q50/06H02J3/00H02J2203/20Y04S10/50
Inventor 李世明张超向德军王茜徐展强颜伟余志文王彬林玥廷
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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