Flexible direct-current power module capacitance detection method and resistance detection method

A power module, flexible DC technology, applied in capacitance measurement, measurement of resistance/reactance/impedance, measurement device, etc., to achieve the effect of improving operational reliability

Pending Publication Date: 2022-01-28
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Full testing of each link of the power module is an important means to reduce the failure rate during operation, but there is no effective method for abnormal detection of the capacitance of the flexible DC power module to improve the operation reliability of the converter valve

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  • Flexible direct-current power module capacitance detection method and resistance detection method
  • Flexible direct-current power module capacitance detection method and resistance detection method
  • Flexible direct-current power module capacitance detection method and resistance detection method

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Embodiment Construction

[0036] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. 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.

[0037] For ease of understanding, see figure 1 , figure 1 It is a schematic flowchart of a method for detecting capacitance of a flexible DC power module provided in an embodiment of the present invention. The capacitance detection method of the flexible DC power module provided in the embodiment of the present invention includes:

[0038] Ste...

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Abstract

The invention discloses a flexible direct-current power module capacitance detection method and resistance detection method, and the method comprises the steps: firstly building a flexible direct-current power module test platform, sending a low-voltage charging instruction to an RC detection board when the direct-current capacitance voltage of a tested flexible direct-current power module is about 0V, and controlling the RC detection board to charge the tested flexible direct-current power module; and collecting the change of the direct-current capacitor voltage, and fitting a charging curve of the direct-current capacitor voltage and a charging current curve of the charging resistor so that the capacitance value of the direct-current capacitor of the tested flexible direct-current power module is calculated, and the capacitance value is compared with a preset capacitance value to give a capacitor abnormity alarm. The RC detection board is controlled to discharge to the tested flexible DC power module, at the moment, the DC capacitor discharges through the power module voltage-sharing resistor, the voltage change of the DC capacitor is collected, the resistance value of the voltage-sharing resistor is calculated, and the resistance value is compared with a preset resistance value to realize resistance abnormity alarm. Abnormality detection of capacitance and resistance of the flexible DC power module is realized, and the operation reliability of the converter valve is improved.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a capacitance detection method and a resistance detection method of a flexible direct current power module. Background technique [0002] Compared with the traditional HVDC transmission technology (LCC), flexible DC transmission based on Modular Multilevel Converter (MMC, ModularMultilevel Converter) can independently control active power and reactive power, and the control is more flexible. It is a new generation of DC transmission technology in the world. New energy grid-connected, renewable energy long-distance transmission, grid flexible partition interconnection and other fields have been widely used. [0003] The number of power modules contained in the converter valve is huge, and each power module can be regarded as a power electronic device including multiple components such as IGBT, capacitor, energy harvesting power supply, voltage measurem...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): G01R27/26G01R27/02
CPCG01R27/2605G01R27/02
Inventor熊岩饶宏周月宾朱喆许树楷易荣周见豪
OwnerELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD