Converter and its operation monitoring method

An operation monitoring and converter technology, applied in the direction of instruments, measuring electrical variables, measuring resistance/reactance/impedance, etc., can solve the problem that the DC bus capacitor is not maintained in time, and achieve the effect of eliminating potential safety hazards.

Active Publication Date: 2022-03-22
SHENZHEN HOPEWIND ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of this application is to provide a converter and its operation monitoring method to solve the problem of safe operation of the converter caused by the lack of timely maintenance of the DC bus capacitor

Method used

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  • Converter and its operation monitoring method
  • Converter and its operation monitoring method
  • Converter and its operation monitoring method

Examples

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no. 1 example

[0030] Such as figure 1 As shown, the first embodiment of the present application provides a converter operation monitoring method, the converter operation monitoring method includes:

[0031] Step S11, during the precharging process of the DC bus capacitor of the converter, obtain the AC side voltage of the converter and the DC bus capacitor voltage;

[0032] Step S12. Determine the actual capacitance of the DC bus capacitor according to the acquired AC side voltage and DC bus capacitor voltage;

[0033] Step S13 , when the actual capacitance of the DC bus capacitor is less than a preset ratio of the rated capacitance of the DC bus capacitor, send out a warning message.

[0034] In one embodiment, the step of acquiring the AC side voltage and the DC bus capacitor voltage of the converter during the precharging process of the DC bus capacitor of the converter further includes:

[0035] When the converter is shut down or in standby and the voltage of the DC bus capacitor is l...

no. 2 example

[0056] Such as Figure 6 As shown, the second embodiment of the present application provides a converter, the converter includes a memory 21, a processor 22, and a converter stored in the memory 21 and operable on the processor 22 Operation monitoring program, when the converter operation monitoring program is executed by the processor 22, it is used to implement the following steps of the converter operation monitoring method:

[0057] During the precharging process of the DC bus capacitor of the converter, obtain the AC side voltage of the converter and the DC bus capacitor voltage;

[0058] determining the actual capacitance of the DC bus capacitor according to the obtained AC side voltage and the DC bus capacitor voltage;

[0059] When the actual capacitance of the DC bus capacitor is less than a preset ratio of the rated capacitance of the DC bus capacitor, an alarm message is issued.

[0060] When the converter operation monitoring program is executed by the processor ...

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Abstract

The present application discloses a converter and its operation monitoring method. The converter operation monitoring method includes: acquiring the AC side voltage and the DC bus capacitor of the converter during the precharging process of the DC bus capacitor of the converter voltage; determine the actual capacitance of the DC bus capacitor according to the obtained AC side voltage and the DC bus capacitor voltage; when the actual capacitance of the DC bus capacitor is less than the preset ratio of the rated capacity of the DC bus capacitor In this case, a warning message is issued. This application obtains the AC side voltage of the converter and the DC bus capacitor voltage during the precharging process of the DC bus capacitor of the converter, calculates the actual capacitance of the DC bus capacitor, and then calculates the actual capacitance of the DC bus capacitor When it is less than the preset ratio of the rated capacity of the DC bus capacitor, an alarm message is issued, so that the user can maintain the DC bus capacitor in time, and eliminate the potential safety hazards in the wind power system caused by the DC bus capacitor.

Description

technical field [0001] The present application relates to the technical field of power electronics, in particular to a converter and an operation monitoring method thereof. Background technique [0002] In the DC link of the converter, it is necessary to use a large number of DC bus capacitors as energy storage elements and stabilize the DC bus voltage. very important. [0003] Due to the parasitic inductance of the DC bus, it is easy to form a high-order oscillation circuit between it and the DC bus, which makes the ripple current of the DC bus capacitor amplified, resulting in an increase in the heat generation of the DC bus capacitor and reducing the service life of the DC bus capacitor. The capacitance value of the capacitor will also decrease as the service life of the DC bus capacitor decreases. [0004] When the DC bus capacitor reaches the service life, it is necessary to maintain the DC bus capacitor in time, otherwise it will cause the problem of safe operation o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/42G01R27/26
CPCG01R31/42G01R27/2605
Inventor 周党生袁渊黄峰一
Owner SHENZHEN HOPEWIND ELECTRIC CO LTD
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