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Failure predication method for static security analysis of three-winding transformer

A technology for static safety analysis and transformer faults. It is applied to instruments, measuring electrical variables, measuring devices, etc. It can solve the problems of inability to meet the second-level real-time calculation speed requirements of large power grids and high cost.

Active Publication Date: 2012-10-03
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

Among them, the failure of three-winding transformers involves the disconnection of multiple branches, and at the same time, the medium and low voltage sides are often connected separately with injection components or equivalent loads, resulting in partial power loss after the fault, making the conventional sensitivity algorithm unsuitable for the local power loss of the power system after the fault. , and re-forming the matrix and factor table for calculation requires a lot of computer time, which cannot meet the speed requirements of second-level real-time calculation of large power grids

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  • Failure predication method for static security analysis of three-winding transformer
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  • Failure predication method for static security analysis of three-winding transformer

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Embodiment Construction

[0069] The present invention will be further described in detail below in conjunction with the drawings.

[0070] Such as figure 1 , A three-winding transformer fault judgment method for static safety analysis, the method includes the following steps:

[0071] Step 1: Carry out ground state power flow calculation to obtain Jacobian matrix J 0 , The corresponding sensitivity matrix S 0 And the initial state variable X of the grid composed of node voltage and phase angle 0 ;

[0072] Step 2: Determine the wiring mode of the three-winding transformer that has failed;

[0073] Step 3: Calculate grid state variables and power flow according to the connection method;

[0074] Step 4: Determine whether there is an over-limit phenomenon in the power system. If so, define the fault as a harmful fault.

[0075] In the step 2, the wiring method includes a wiring method that does not cause disassembly or power loss, the low-voltage side is connected to the injection component alone and the medium v...

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Abstract

The invention provides a failure predication method for static security analysis of three-winding transformers, belonging to the technical field of electric system analysis. In the invention, transformers are sorted aiming at connection modes mainly adopted by the three-winding transformers in an electric grid, and the computing mode of the on-off sensitivity of different wire connection modes is deduced. The invention is suitable for the computation of the sensitivity of load flows of most faulty three-winding transformers in the electric grid, solves the problem that the conventional sensitivity algorithm can not be applied due to local electric power shutdown caused by the failure of the three-winding transformers and can meet the requirement of the on-line real-time second grade analysis and computation of the large-scale electric grid in both accuracy and speed by acquiring comprehensive accurate operating data of power flows and reactive power flows of a system, voltage amplitudes value and voltage phases of a bus, and the like.

Description

Technical field [0001] The invention belongs to the technical field of power system analysis, and specifically relates to a three-winding transformer fault judgment method for static safety analysis. Background technique [0002] Static safety analysis is an important part of power system safety analysis. At present, static safety analysis N-1 generally uses sensitivity method, DC power flow method, and compensation method. Among them, DC power flow method cannot calculate reactive power and voltage. The power system needs to check whether the branch power flow and cross-section power flow exceed the limit, and at the same time check whether the bus voltage exceeds the limit; if the number of iterations of the compensation method is not enough, the error between the voltage and the reactive power flow is also large; the sensitivity method will support Circuit breaking is regarded as a disturbance of normal operation. The influence of branch circuit breaking is simulated with the ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 蔡帜戴赛周京阳潘毅李强
Owner CHINA ELECTRIC POWER RES INST
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