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Calculation method of composite electric field of converter transformer considering temperature gradient

A converter transformer and temperature gradient technology, applied in calculation, complex mathematical operations, instruments, etc., can solve problems such as not considering longitudinal insulation factors, large errors, ignoring fine modeling of oil passages, etc., and achieve the effect of improving calculation accuracy

Inactive Publication Date: 2018-01-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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Problems solved by technology

However, with the rise of guided oil circulation, the correlation analysis does not take into account the longitudinal insulation factor, ignoring the fine modeling of the oil passage, such a model has a large error in analyzing the temperature distribution

Method used

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  • Calculation method of composite electric field of converter transformer considering temperature gradient
  • Calculation method of composite electric field of converter transformer considering temperature gradient
  • Calculation method of composite electric field of converter transformer considering temperature gradient

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Embodiment Construction

[0023] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the following descriptions are for illustration only, and are not intended to limit the scope of the present invention and its application.

[0024] Taking the two-dimensional problem as an example, the technical solution of the present invention is described in detail. The method flow is as follows figure 1 Shown:

[0025] Step 1: Establish a two-dimensional magnetic field simulation model of the converter transformer, and calculate the core loss and winding loss of the converter transformer respectively. This article will combine the MagNet electromagnetic analysis software commonly used in transformer engineering to deal with the core loss containing high-order harmonics as follows:

[0026] P=K h f α B β +K e (sfB) 2 (1)

[0027] In the formula: the first term on the right side of the equation is the sum of hysteres...

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Abstract

The invention belongs to the technical field of multi-physics coupling computing of a converter transformer, in particular to a calculation method of a composite electric field of the converter transformer considering temperature gradient. The calculation method comprises the steps that firstly, loss of transformer core and winding is calculated; next a fluid-temperature field model of the converter transformer is established, the fluid-temperature field model is discretized into a triangular-quadrilateral network, the distribution of a temperature field when heat flux is coupled inside a fueltank is calculated and analyzed by utilizing a magnetic field loss as the heat source. According to the electric field characteristics, an electric field model is established and divided into a triangular network, and temperature results of a fluid-temperature field are mapped into the electric field model through a fast mapping method; finally, a power transmission system model is built, a ground voltage wave is transformed to the frequency domain, and the results are returned to the time domain by utilizing the Fourier inverse transform, and a non-sinusoidal steady-state alternate current / direct current composite electric field of the converter transformer is analyzed and compared under the condition of homogeneous temperature and non-uniform temperature. The method considers the existence of temperature gradient, improves the calculation accuracy, and makes the calculation results more accord with an actual situation.

Description

technical field [0001] The invention belongs to the technical field of multi-physics field coupling calculation of converter transformers, and in particular relates to a calculation method for compound electric fields of converter transformers considering temperature gradients. Background technique [0002] The converter transformer is one of the most important components in the UHV DC transmission project, which has the function of transmitting power and converting electric energy. In the actual working condition, the converter transformer is in the composite electric field. At this moment, the grid side is in the fundamental frequency sinusoidal voltage, and the valve side includes DC voltage, fundamental frequency sinusoidal voltage, and high-order harmonic voltage. The working environment of the converter transformer grid side and the valve side It is relatively complex, and the internal structure of the converter transformer is also relatively complicated. The complex w...

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Application Information

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IPC IPC(8): G06F17/50G06F17/14G06Q50/06
CPCY02E60/00
Inventor 刘刚池骋靳艳娇孙立鹏马永强李琳
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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