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A Transformer Three-Phase Model Establishment Method Based on Unified Transformation Matrix

A technology of model building and transformation matrix, which is applied to AC networks with the same frequency from different sources, AC network circuits, circuit devices, etc., can solve problems such as inability to obtain three-phase transformers, complex logic, etc.

Active Publication Date: 2020-03-13
DALIAN MARITIME UNIVERSITY +1
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Problems solved by technology

[0118] The transformation matrix-based transformer three-phase model establishment method proposed by Chinese patent CN201810354603.X solves the problem that the correlation matrix method cannot obtain the node admittance matrix of some connection groups of three-phase transformers, but when obtaining the secondary voltage transformation matrix The logic is more complicated and there is still room for improvement

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  • A Transformer Three-Phase Model Establishment Method Based on Unified Transformation Matrix
  • A Transformer Three-Phase Model Establishment Method Based on Unified Transformation Matrix
  • A Transformer Three-Phase Model Establishment Method Based on Unified Transformation Matrix

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Embodiment Construction

[0226] In the following, the three-phase transformer connected by Yyn0 and Yyn6 is taken as an example to further illustrate the derivation process of the three-phase transformer model of the present invention with reference to the accompanying drawings.

[0227] (1) Derivation of three-phase model of transformer connected by Yyn0

[0228] according to Picture 9 The method of establishing three-phase transformer model based on the unified conversion matrix shown Figure 8 (a) The three-phase model of the transformer connected by Yyn0 shown in (a). Input transformer primary connection mode k 1 Is Y, transformation ratio is α; secondary winding connection mode k 2 Is yn, transformation ratio is β; transformer connection group label k 3 Is 0.

[0229] As a result of the operation, the voltage transformation matrix and current transformation matrix of the three-phase transformer connected by Yyn0 are as follows:

[0230]

[0231]

[0232] Get the node admittance matrix Y of the three-ph...

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Abstract

The invention discloses a method for establishing a three-phase transformer model based on a unified conversion matrix. The connection of transformer electrical quantity transformation matrix of different groups is established under the same connection mode of the original secondary side of the transformer. A basic electrical quantity transformation matrix is composed of a unified transformation matrix and the transformation matrix of different groups of transformers is directly written in the same connection mode. Then the three-phase model of the transformer is driven. The method deduces thesame original secondary side wiring mode. The electrical quantity transformation matrices of transformers with different group labels are interconnected. The transformation matrix can be transformedfrom a basic secondary voltage by a transformation matrix to get the same original secondary side wiring. The secondary side voltage transformation matrix of each connection group reduces the number of electrical quantity transformation matrices that need to be set with a simple conversion formula. The method simplifies the workload of software writing and reduces the probability of errors and improves the accuracy of obtaining a three-phase model of a three-phase transformer.

Description

Technical field [0001] The invention relates to a method for establishing a three-phase model of a transformer, in particular to a method for establishing a three-phase model of a distribution three-phase transformer used in a three-phase power flow calculation of a distribution network. Background technique [0002] The distribution system is a network system composed of distribution lines, distribution transformers, distribution voltage regulators, distribution switches, distribution capacitors, and distribution loads that directly distribute electrical energy to end users. To analyze the power system, it is necessary to establish a suitable model for each component in the system. Different from the three-phase symmetrical operation mode of the high-voltage transmission grid, the load and the network of the distribution network may be asymmetrical. When the power flow calculation of the distribution network, the characteristics of the three-phase asymmetry should be considered ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/06
CPCH02J3/06H02J2203/20
Inventor 姚玉斌朱景伟
Owner DALIAN MARITIME UNIVERSITY
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