Transformer direct-current magnetic bias simulation method and device

Abstract

The embodiment of the invention provides a transformer direct-current magnetic bias simulation method and device and relates to the field of transformer simulation. Real situations of a magnetization curve under the influence of direct-current magnetic bias can be simulated more precisely, and accordingly accurate simulation of distortion exciting current under direct-current magnetic bias is achieved on the basis of the magnetization curve. The method includes the steps that a direct-current bias flux density deltaB0 generated by direct current is calculated, and a Bm-deltaB0 curve is calculated, wherein Bm is work flux density of a transformer; according to the Bm-deltaB0 curve, a bias-free magnetization curve in a transformer model is corrected, and according to the corrected bias-free magnetization curve and the transformer model, the magnitude of exciting current, waveform and harmonic components in the transformer are determined. The method and device are used for simulating transformer direct-current magnetic bias.

Description

technical field [0001] The invention relates to the field of transformer simulation, in particular to a transformer DC bias simulation simulation method and device. Background technique [0002] In the prior art, the saturation characteristic of the transformer core is generally simulated by using a DC bias simulation method. Usually, the DC bias simulation can be performed based on the transformer model of the classical method, or the DC bias simulation can be performed based on the transformer model of the unified electromagnetic equivalent method. [0003] There is a certain difference in the saturation characteristics of the transformer core obtained by the DC bias simulation based on the above two models. Among them, when the DC bias simulation is performed based on the classical transformer model to obtain the saturation characteristics of the transformer core, the compensation current source is used to simulate the saturation degree of the core. However, the magneti...

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Problems solved by technology

The disadvantage of the above scheme is that since the magnitude of the DC current flowing into the transformer in actual engineering cannot be determined, the bias flux generated by different DC currents is different, and the influence on the magnetization curve of the transformer is also different.

[0005] Therefore, the DC bias simulation method in the prior art cannot guarantee that the simulation of the magnetization curve and the excitation current of the transformer under the DC bias can achieve sufficient accuracy under the premise of real-time simulation and easy implementation, and obtain the saturation characteristics of the transformer core

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