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Method and device for detecting capacitance value

A technology of capacitance value and detection method, which is applied in the direction of measurement device, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve the problem of inability to detect the capacitance value of filter

Active Publication Date: 2017-05-10
维谛新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The embodiment of the present invention provides a method and device for detecting the capacitance value, which is used to solve the problem that the capacitance value of the filter cannot be detected in the existing power conversion system

Method used

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  • Method and device for detecting capacitance value
  • Method and device for detecting capacitance value
  • Method and device for detecting capacitance value

Examples

Experimental program
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Embodiment 1

[0041] In Embodiment 1 of the present invention, first determine the capacitance value of the filter in the power conversion system, and then determine whether the capacitance value of the filter is normal.

[0042] image 3 The detailed flowchart of the detection method for the capacitance value of the filter in the power conversion system provided by Embodiment 1 of the present invention specifically includes:

[0043] Step 301 , after receiving the start-up command, the controller of the power conversion system performs a start-up routine test to determine whether the result of the start-up routine test is normal.

[0044] In the prior art, after receiving the start-up command, the controller of the power conversion system will perform routine start-up detection, and will start the converter to enter the working state only after confirming that the routine start-up detection result is normal.

[0045] Routine start-up detection may specifically include controlling the clos...

Embodiment 2

[0079] Figure 4 The detailed flowchart of the detection method for the capacitance value of the filter in the power conversion system provided by Embodiment 2 of the present invention specifically includes:

[0080] Step 401 , after receiving the start-up command, the controller of the power conversion system performs a start-up routine test to determine whether the result of the start-up routine test is normal.

[0081] When the routine detection result of starting up is normal, go to step 402; when the routine detection result of starting up is abnormal, go to step 407.

[0082] Step 402, controlling the output switch of the power conversion system to be turned off.

[0083] Step 403, controlling the converter to output a preset voltage.

[0084] The above steps 401 to 403 are the same as steps 301 to 303 in Embodiment 1, and will not be repeated here.

[0085] Step 404: Acquire the instantaneous current value monitored by the current sensor in real time, and determine t...

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PUM

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Abstract

The invention discloses a detection method and device of the capacitance value of a filter in an electrical-power conversion system so that a problem that in the prior electrical-power conversion system, the capacitance value in a filter cannot be detected. The method includes the following steps: controlling an output switch in the electrical-power conversion system to switch off and controlling a converter of the electrical-power conversion system to output a preset voltage; obtaining a current instantaneous value which is monitored by a current sensor of the electrical-power conversion system in a real-time manner; when the output switch of the electrical-power conversion system is switched off, the current monitored by the current sensor being the capacitive current of the filter; and based on the current instantaneous value monitored by the current sensor of the electrical-power conversion system in a real-time manner, determining whether the capacitance value of the filter is normal.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a detection method and device for the capacitance value of a filter in a power conversion system. Background technique [0002] With the development of science and technology, renewable energy sources such as wind energy and solar energy have attracted more and more attention. Wind power generators, solar panels and other power generation equipment convert wind energy, solar energy, etc. into direct current and then output it to the power conversion system. The power conversion system processes the direct current output from the power generation equipment, generates alternating current that is synchronized with the grid, and then connects it to the grid. [0003] The structure of the power conversion system in the prior art is as follows figure 1 As shown, it includes a converter 101, a current sensor 102, a filter 103, an output switch 104, a voltage sensor 105 and a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
Inventor 李卿段博刘震
Owner 维谛新能源有限公司
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