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Method and system for simulating parameters of three-phase auto-coupling transformer

An autotransformer and simulation method technology, applied in transformers, fixed transformers, software simulation/interpretation/simulation, etc., can solve the problem of unsimulated high and low voltage winding electrical connection, transformer model can not simulate 500kV autotransformer three-phase asymmetry, The three-phase autotransformer model cannot set the parameters of each phase by phase, etc., to achieve the effect of high practical value

Active Publication Date: 2012-06-27
FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID +1
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Problems solved by technology

[0003] The component library of the existing electromagnetic transient simulation software PSCAD provides single-phase and three-phase autotransformer models, but its three-phase autotransformer model cannot set the parameters of each phase separately and is a double-winding model. The autotransformer model is also a double-winding model, and none of the existing autotransformer models simulates the electrical connection between the high and low voltage windings
Therefore, the transformer model provided by PSCAD simulation software cannot simulate the three-phase asymmetry problem of 500kV autotransformer

Method used

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  • Method and system for simulating parameters of three-phase auto-coupling transformer

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Embodiment Construction

[0017] see figure 1 , figure 1 It is a schematic flow chart of the three-phase autotransformer parameter simulation method of the present invention.

[0018] The three-phase autotransformer parameter simulation method comprises the following steps:

[0019] S1, read the single-phase three-winding transformer model in the PSCAD simulation software;

[0020] In this step, the ordinary three-winding transformer model in the classical method is read from the PSCAD simulation software.

[0021] S2, connecting the two windings of the single-phase three-winding transformer model end-to-end to obtain a single-phase three-winding autotransformer model, and connecting the three single-phase three-winding autotransformer models into three-phase according to the wiring group Three-winding autotransformer model;

[0022] First of all, according to the direct electrical connection between the series winding and the common winding in the autotransformer, the two windings in the ordinary ...

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Abstract

The invention provides a method and a system for simulating parameters of a three-phase auto-coupling transformer. The method comprises the following steps of: performing certain connection on high and medium voltage sides of a common single-phase three-winding transformer model in power system computer aided design (PSCAD) simulation software to form a three-phase three-winding auto-coupling transformer model; converting transformer parameters in an actual grid; and inputting the parameters into a self-built three-phase three-winding auto-coupling transformer model, so that electromagnetic transient simulation for asymmetric three-phase parameters of a 500kV auto-coupling transformer can be performed, the voltage and current of high, medium and low voltage sides of the transformer can be analyzed, influence of relay protection of the 500kV auto-coupling transformer caused by the asymmetric three-phase parameters can be determined, and relay protection analog control is performed. By adoption of the method provided by the invention, the problem of three-phase asymmetry of the auto-coupling transformer can be solved by using an auto-coupling transformer model which is not in direct electric connection, the influence of the electrical characteristic and relay protection of the transformer caused by the asymmetric three-phase parameters can be determined, and a high practical value is obtained.

Description

technical field [0001] The invention relates to the technical field of simulation technology of an autotransformer in a power system, in particular to a parameter simulation method for a three-phase autotransformer and a parameter simulation system for a three-phase autotransformer. Background technique [0002] Autotransformers have the advantages of low cost, high operating efficiency and low excitation power, and are widely used in power grids with voltage levels of 220kV and above. The 500kV autotransformer has a large weight and volume. For transportation and other considerations, the type of single-phase transformer group is mostly used. The standard connection group of 500kV autotransformer is usually connected in the connection mode of YN, a0, d11, that is, it is composed of three single-phase three-winding autotransformers through the connection mode, and the high-voltage side and medium-voltage side windings adopt star connection mode, the neutral point is grounde...

Claims

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Application Information

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IPC IPC(8): G06F9/455H01F30/02
Inventor 张乾良夏成军
Owner FOSHAN POWER SUPPLY BUREAU GUANGDONG POWER GRID
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