Direct-current converter high-frequency impedance modeling method

A technology of high-frequency impedance and modeling method, which is applied in the direction of converting DC power input to DC power output, parallel operation of DC power supplies, and converting AC power input to DC power output. Equivalent impedance calculation and other issues, to achieve the effect of short sampling time and fast speed

Inactive Publication Date: 2019-12-03
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Description
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Problems solved by technology

After a fault, the operating state of the system changes drastically and rapidly, and it is difficult to maintain a stable operating point. Although the above modeling methods have high accuracy, they are not suitable for the calculation of equivalent impedance for the purpose of fault isolation

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  • Direct-current converter high-frequency impedance modeling method
  • Direct-current converter high-frequency impedance modeling method

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Embodiment Construction

[0034] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0035] The embodiment of the present invention provides a DC converter high-frequency impedance modeling method suitable for DC distribution network fault protection setting calculation, such as figure 1 As shown, it mainly includes:

[0036] 1. Determine the various harmonic paths in DC / DC converters and modular multilevel converters.

[0037] DC / DC converters include: DC / DC step-up converter and DC / DC step-down converter; DC / DC step-up converter...

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Abstract

The invention discloses a direct-current converter high-frequency impedance modeling method. The method comprises the steps of determining various harmonic paths in a DC/DC converter and a modular multilevel converter, wherein the DC/DC converter and the modular multilevel converter belong to a direct current converter; carrying out equivalence and simplification on high-frequency harmonic paths in the DC/DC converter and the modular multilevel converter according to an actual impedance parameter to obtain a constant high-frequency harmonic path; and based on the constant high-frequency harmonic path, calculating a high-frequency impedance model of each DC/DC converter and the modular multilevel converter. By using the method, on the basis of analyzing the DC/DC converter and an MMC harmonic path, reasonable equivalence and simplification are performed according to an element parameter characteristic, and a high-frequency impedance model of the converter is established. The model is not influenced by a converter control strategy and a system operation state, can accurately reflect the high-frequency impedance characteristic of the system under direct-current protection logic that the converter is not shut, and has an important reference value for configuration of direct-current protection.

Description

technical field [0001] The invention relates to the technical field of power system analysis, in particular to a DC converter high-frequency impedance modeling method suitable for DC distribution network fault protection setting calculation. Background technique [0002] In recent years, the distributed power supply and DC load capacity have grown rapidly. The DC power distribution network based on MMC (Modular Multilevel Converter, Modular Multilevel Converter) has the advantages of less commutation links, low power loss, and high waveform quality. A new hotspot of foreign research. There are a large number of power electronic converters in the DC distribution network. When a bipolar short circuit occurs, the fault current rises rapidly and the steady-state value is high. The fault is quickly isolated within milliseconds. Therefore, the fault isolation of the DC distribution network has always been a technical difficulty that needs to be solved urgently. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M7/00H02J1/12H02J3/38H02J3/36H02J5/00G06F17/50
CPCH02J1/12H02J3/36H02J5/00H02J2003/365H02M3/33523H02M3/33584H02M7/00Y02E60/60
Inventor 贾科朱正轩赵其娟冯涛毕天姝赵冠琨陈金锋
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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