Large power grid parameter recognition and estimation method

A technology of parameter identification and parameter estimation, which is applied in the fields of electrical digital data processing, calculation, electrical components, etc., can solve problems such as small scale, and achieve the effect of simple calculation method and high calculation efficiency

Active Publication Date: 2014-07-23
NARI TECH CO LTD
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  • Application Information

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Problems solved by technology

Investing in the actual parameter identification and estimation technology on site is often not on a large scale

Method used

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  • Large power grid parameter recognition and estimation method
  • Large power grid parameter recognition and estimation method

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Experimental program
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Effect test

Embodiment 1

[0037] see figure 1 , the large power grid parameter identification and estimation method of the present invention specifically includes the following steps:

[0038] (1) Take real-time data;

[0039] (2) Topological partitioning according to the voltage level, where figure 2 It is a typical provincial simplified power grid. The steps of topological partitioning are as follows:

[0040] 1) The circuit is abstracted as an edge in graph theory, and the electrical buses on both sides of the circuit are abstracted as vertices in graph theory to establish a graph theory model.

[0041] 2) Decompose the graph theory model into several islands, and open source or commercial topology analysis software packages, such as Boost::graph library, can be used for decomposition. Each island corresponds to a partition.

[0042] 3) If a node in the partition is connected to a transformer branch, the power flow of the transformer branch is converted to the injected power flow of the node. ...

Embodiment 2

[0097] The invention is successfully applied to the intelligent dispatching technical support system (D5000 system) of North China Power Grid. The North China Power Grid spans four provinces and cities including Beijing, Tianjin, Hebei, Shanxi, Inner Mongolia, and Shandong. It is a large-scale power grid with more than 6,000 computing nodes. The parameter identification and estimation proposed by the present invention can decompose the North China power grid into more than 60 partitions to realize simplified decoupling of spatial scale. The total calculation time of a single section is controlled within 45s, and the calculation is performed every 15 minutes and the historical data is recorded. Table 2 shows the test results of the North China Power Grid, which are obtained by artificially setting wrong parameters from a group of branches whose parameters have been confirmed to be correct, in order to verify the algorithm effect during the actual operation of the North China Po...

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Abstract

The invention discloses a large power grid parameter recognition and estimation method. The large power grid parameter recognition and estimation method specially comprises the following steps that (1) real-time data are obtained; (2) topology decomposition is conducted on the real-time data to decompose the real-time data into a plurality of partitions according to voltage classes; (3) state estimation calculation is conducted on all the partitions sequentially and bad data are recognized; (4) parameter recognition and estimation calculation is conducted on all the partitions sequentially, wherein firstly, parameter recognition is conducted, and if suspicious parameters exist, parameter estimation is conducted and the parameters are corrected; then parameter recognition is conducted again and if no suspicious parameters exist, parameter recognition results and parameter estimation results of this time are stored; (5) average values of the stored parameter recognition results and the stored parameter estimation results are counted and serve as parameter recognition and estimation output results, and after a period interval passes, the steps (1) is conducted. The lagrangian multiplier method is adopted in the large power grid parameter recognition and estimation method, the calculation method is simple and the calculation efficiency is high. The large power grid parameter recognition and estimation method can be successfully applied to large-scale power grids.

Description

technical field [0001] The invention relates to a large power grid parameter identification and estimation method, which belongs to the technical field of electric power system scheduling automation. Background technique [0002] State estimation is the basis of the network analysis function in the power grid dispatching automation system, and provides real-time data sections close to the real power flow state of the system for other application modules. With the development of substation automation and communication technology, the accuracy and coverage of telemetry and telesignaling of dispatching automation system have been greatly improved. Parameter error is becoming more and more the bottleneck affecting the calculation accuracy of state estimation. [0003] At present, the parameters of the scheduling automation system mainly come from the design parameters (nameplate parameters) and measured parameters of the equipment, which are entered into the commercial database...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/00G06F19/00
Inventor 邹德虎龚成明王毅
Owner NARI TECH CO LTD
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