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DAB type direct current converter high-frequency impedance equivalent modeling method

A DC converter and high-frequency impedance technology, applied in the field of value modeling, to achieve high precision, beneficial to the analysis of fault characteristics and fault location technology

Inactive Publication Date: 2019-08-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most of the fault location methods of the DC system are also carried out by analyzing the electrical quantity after the fault, which does not really solve the nonlinear problem brought by the DC converter to the system

Method used

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  • DAB type direct current converter high-frequency impedance equivalent modeling method
  • DAB type direct current converter high-frequency impedance equivalent modeling method
  • DAB type direct current converter high-frequency impedance equivalent modeling method

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Embodiment Construction

[0022] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0023] figure 1 It is a flow chart of the high-frequency impedance equivalent modeling method of the DAB type DC converter of the present invention, and the present invention proposes a DAB type DC converter high-frequency impedance equivalent modeling method, comprising the following steps:

[0024] Step 1: Analyze a single DAB module in a DAB-type DC converter, equate the switching device to a resistance element, and ignore the influence of the switching process;

[0025] Step 2: Using the step signal generated when the system fails as a high-frequency source, analyze the high-frequency impedance loop of the DC converter after the fault, and derive its high-frequency impedance expression.

[0026] In the step 1, the DAB type DC converter is composed of multiple DAB modules connected in parallel on the low voltage side and connected in series on the high voltage side. A ...

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Abstract

The invention belongs to the technical field of flexible direct-current power distribution system fault positioning, and particularly relates to a DAB type direct-current converter high-frequency impedance equivalent modeling method, which comprises the following steps of analyzing a single DAB module in a DAB type direct-current converter, enabling a switching device to be equivalent to a resistor element, and ignoring the influence of a switching process; using a step signal generated during system failure as a high-frequency source, analyzing a high-frequency impedance loop of the DC converter after failure, and obtaining a high-frequency impedance expression of the DC converter through derivation. The method specifically comprises the steps of firstly, enabling a high-frequency transformer in a loop to be equivalent, converting the parameters to a high-voltage side, and establishing a relational expression of voltage and current between two coupling coils of the transformer; and according to the structure and parameters of the high-frequency transformer, deducing each circuit parameter in the T-shaped equivalent circuit of the transformer, and converting the circuit parametersto a high-voltage side to obtain the equivalent circuit of the transformer. According to the method, the nonlinear characteristic of a system caused by a power electronic device is solved, and the obtained model has the very high precision.

Description

technical field [0001] The invention belongs to the technical field of fault location of a flexible DC power distribution system, and in particular relates to a high-frequency impedance equivalent modeling method of a DAB type DC converter. Background technique [0002] In recent years, it has become a development trend for large-scale distributed power sources, electric vehicles and other flexible loads to be integrated into the distribution network through power electronic converter equipment. The DC power distribution system has fewer commutation links, simple structure, high conversion efficiency, and The advantages of large radius and capacity and good economy have become a hot topic of research and development at home and abroad. In the flexible DC power distribution system, the DC link presents the characteristics of strong power electronics. Different topological structures and different control strategies of the network will affect the fault characteristics. The fau...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/39G06F30/20
Inventor 贾科宣振文王聪博朱瑞毕天姝陈金锋
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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