Power grid topology error identification system and method based on road-loop equation

A power grid topology and topology error technology, applied in the direction of measuring electricity, measuring electrical variables, measuring current/voltage, etc., can solve the problems of single data source, inability to effectively identify, asynchronous, etc., and achieve the effect of high accuracy and reliability

Active Publication Date: 2014-05-28
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, the data source of the traditional method is relatively single, and most of them only use the supervisory control and data acquisition (SCADA) system to identify the switch information incorrectly. This type of data acquisition cycle is long and asynchronous, and often requires two Subsampled values ​​greatly reduce the accuracy and speed of topology error identification
At the same time, it cannot be effectively identified when topological errors and bad data coexist

Method used

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  • Power grid topology error identification system and method based on road-loop equation
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  • Power grid topology error identification system and method based on road-loop equation

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Embodiment 1

[0044] figure 1 It is the structural diagram of the network topology error identification system based on the road-loop equation provided by the present invention, such as figure 1 As shown, the network topology error identification system based on the road-loop equation includes a data acquisition module, a branch current calculation module, a topology error identification module, a bad data identification module and a result output module. Among them, the data acquisition module, the branch current calculation module, the topology error identification module, the bad data identification module and the result output module are sequentially connected, and the topology error identification module and the bad data identification module are also respectively connected with the branch current calculation module.

[0045] The data acquisition module is used to collect network structure parameters, tie switch status, circuit breaker status, branch rated current, node injection curre...

Embodiment 2

[0148] Based on PSCAD simulation software, build figure 2 The IEEE3-machine 9-node system model shown. Assume that busbars B2 and B7 are capable of switching operations. Among them, the system power supply S N =100MVA, U N =220KV, then I · LN = ( 0.223 + j 0.138 ) kA , ε 1 =(0.01785+j0.0111)kA.

[0149] Verify the formula (5), the ground admittance of its branch is B / 2=1.623×10 -4 S, according to the above principles, the node injection current is shown in formula (11), and the loop current is i L9 =(-0.43628-j0.216385)kA, the calculation result is as follows image 3 shown.

[0150] Since the current of each branch of the system meets the set conditions, there is no topology information error and bad data.

[0151] I · ...

Embodiment 3

[0177] This embodiment uses the 10-machine 39-node system as an example, the system structure and road markings are as follows Figure 14 As shown in , the solid triangle arrows are marked as connecting branches, and the rest of the branches are tree branches. The minimum rating of the branch circuit is Therefore1 =(0.021544+j0.012933)kA. For networks with a large number of nodes and complex wiring, local topology errors can be identified. This paper only uses Figure 14 Take the two local networks marked as an example.

[0178] (1) The existence of multiple bad data.

[0179] node A local network with an end point such as Figure 15 shown. Its T and B matrices are shown in formula (22), and according to the analysis of formula (6), the injection current of the node can be the current of the other branches of the node and the equivalent value of the injection current of the node (for example, in the loop, except the influence of the current of the loop where it is loca...

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Abstract

The invention belongs to the technical field of topology analysis in an electric system and discloses a power grid topology error identification system and method based on a road-loop equation. The system comprises a data acquisition module, a branch current calculating module, a topology error identification module, a bad data identification module and a result outputting module, wherein the data acquisition module, the branch current calculating module, the topology error identification module, the bad data identification module and the result outputting module are sequentially connected, and the topology error identification module and the bad data identification module are both connected with the branch current calculating module. The method comprises the steps of acquiring data, solving the branch current calculation value, identifying power grid topology errors and updating data when power grid topology errors exist, identifying bad data and correcting relevant bad data when bad data exist, and outputting power grid topology data and the branch current measurement value at last. The power grid topology error identification system and method based on the road-loop equation are not affected by the two factors of topology errors and bad data and are high in identification accuracy and reliability.

Description

technical field [0001] The invention belongs to the technical field of power system topology analysis, and in particular relates to a network topology error identification system and method based on road-loop equations. Background technique [0002] The power system topology analysis data is mainly composed of switching quantities. However, in the process of switching quantities collection, due to equipment or network reasons, it is inevitable that the information will be damaged or deviated, resulting in errors in topology information. [0003] At present, scholars at home and abroad have proposed many methods for power system topology error identification, such as: residual method, rule method, minimum information loss method, information graph method, transfer power flow method, etc. However, the data source of the traditional method is relatively single, and most of them only use the supervisory control and data acquisition (SCADA) system to identify the switch informati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G01R19/00
Inventor 马静张俣妤马伟王增平
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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