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Two-port circuit of ultra-high-voltage direct-current converter valve

An ultra-high voltage DC, two-port technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve the inconvenience of transient voltage analysis between valve tower layers, high time and space complexity, and simulation efficiency. Low problems, to achieve the effect of shortening extraction time and computational complexity, shortening modeling and simulation time, and improving efficiency

Active Publication Date: 2018-02-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the UHV DC converter valve circuit in the prior art is modeled based on a single device, the modeling method used has high operational difficulty, and the established model structure is complex, which is not convenient for engineering application
In addition, the traditional parasitic capacitance parameter extraction method used in the existing technology has high time complexity and space complexity, resulting in long modeling and simulation time and low simulation efficiency. The analysis of the transient voltage between valve tower layers caused great inconvenience

Method used

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  • Two-port circuit of ultra-high-voltage direct-current converter valve
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  • Two-port circuit of ultra-high-voltage direct-current converter valve

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Embodiment 1

[0058] The present invention takes the ±1100kV UHV converter valve tower as an example, and establishes a two-port equivalent circuit model for it. The ±1100kV converter valve is a double valve with 7 layers in total, the top layer and the bottom layer are respectively a large pressure equalizing ring and a shielding cover. The valve structure of each layer of the middle 5 layers is composed of two converter valve modules placed side by side. The three-dimensional model structure of each valve module is as follows: figure 1 As shown, each valve module is composed of two valve assemblies, the valve assembly includes 2 saturable reactors and 9 thyristor stages, through the insulating structural support, thyristor press-fit structure, saturable reactor, damping resistance unit, damping Capacitor units, gate units, wires and water pipes are connected to each other. The saturable reactor is connected in series with the anode terminal of the thyristor element. attached figure 2 ...

Embodiment 2

[0061] The present invention takes the ±1100kV UHV converter valve tower as an example to extract the equivalent parasitic capacitance of the valve layer port. Figure 9 The three-dimensional model of the shielding cover of the valve tower is shown. The shielding cover of the ±1100kV converter valve adopts a split pressure equalization design. The short shield has two large grading rings symmetrically distributed on the top and two large shields symmetrically distributed on the bottom, connected by 6 oblique busbars and 5 horizontal busbars. Each conductor of the shield does not exist in isolation, but forms a potential relationship through potential clamping and connection to the busbar. Specifically, each valve layer is composed of two valve modules, and a total of 4 shields are connected to the outside of each valve module, including 2 corner shields and 2 short shields. The two corner shields are respectively equal to the start potential of the first saturable reactor in ...

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Abstract

The invention belongs to the technical field of electromagnetic transient analysis of power systems, and particularly relates to a two-port circuit of an ultra-high-voltage direct-current converter valve. For improving efficiency of valve layer over-voltage simulation analysis of high-voltage ends of the ultra-high-voltage direct-current converter valve and ensuring precision, the invention provides the two-port circuit of the ultra-high-voltage direct-current converter valve. The two-port circuit includes valve layer circuits and port parasitic-capacitance. Impedance characteristics of key component parameters are analyzed in a main frequency band range of impulse voltage, and the circuit of a single valve layer or even the circuit of multiple valve layers is established; and valve layerparasitic-capacitance is extracted on the basis of a terminal capacitance method, and an iterative equivalent method is utilized on the basis thereof to extract the port parasitic-capacitance. According to the valve layer circuits established in the two-port circuit, modeling and simulation time is greatly shortened, efficiency of simulation analysis is improved, and time of extraction and computational complexity are also greatly reduced for extraction of parasitic-capacitance parameters.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic transient analysis of power systems, and in particular relates to a two-port circuit of an ultra-high voltage DC converter valve. Background technique [0002] As the core equipment of the DC transmission system, the converter valve is affected by the change of AC and DC system conditions during operation, and will suffer from different types of overvoltage. When the valve tower is subjected to overvoltage, it will cause uneven voltage distribution. This puts forward a higher withstand voltage level requirement for some parts with higher voltage, which is not conducive to the standardization of parts. As the voltage level and transmission capacity of the UHV DC system increase, the volume of the converter valve tower continues to increase and the topology becomes more complex. Due to the cumulative effect of the voltage inhomogeneity between the components of the valve tower, the layer-t...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/367Y02E60/00
Inventor 齐磊唐义李静怡崔翔
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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