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Self-checking system and self-checking method for cascaded multilevel converter

A cascaded multi-level, self-test system technology, applied in the measurement of electrical variables, the conversion of irreversible DC power input to AC power output, and the conversion of AC power input into DC power output, etc., can solve the problem of inability to measure insulation resistance and Calculation and other issues

Active Publication Date: 2016-02-17
SUNGROW POWER SUPPLY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the conventional insulation resistance detection scheme is only suitable for calculating the insulation resistance of a single conversion circuit or inverter, and cannot be used for the measurement and calculation of the insulation resistance of cascaded multilevel converters.

Method used

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  • Self-checking system and self-checking method for cascaded multilevel converter
  • Self-checking system and self-checking method for cascaded multilevel converter
  • Self-checking system and self-checking method for cascaded multilevel converter

Examples

Experimental program
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Effect test

Embodiment 1

[0047] figure 1 It is a schematic structural diagram of the self-test system of the cascaded multilevel converter provided by Embodiment 1 of the present invention Figure 1 . Such as figure 1 As mentioned above, the self-checking system of the cascaded multilevel converter provided in Embodiment 1 of the present invention includes the cascaded multilevel converter 100 and the self-checking device 200, and the cascaded multilevel converter 100 includes at least two cascaded A conversion circuit 130 , the self-test device 200 includes at least one current detection circuit 120 , a voltage acquisition module 210 and a calculation module 220 .

[0048] Specifically, in the above-mentioned at least two conversion circuits 130, the conversion circuit 130 may or may not have a built-in output filter circuit. When the conversion circuit 130 has built-in output filters, the external filter circuit may no longer be provided. , otherwise, it is preferable to add a filter circuit. In...

Embodiment 2

[0056] image 3 It is a schematic circuit diagram of the self-test system of the cascaded multilevel converter provided in the second embodiment of the present invention, as shown in image 3 As shown, at least two conversion circuits 130 in the system include: a first capacitor 1121, a first switching tube 1122, a second switching tube 1123, a third switching tube 1124 and a fourth switching tube 1125;

[0057] The first end of the first switch tube 1122 is electrically connected to the first end of the second switch tube 1123, the first end of the first capacitor 1121 and the positive pole of the corresponding DC source 300 respectively, and the second end of the first switch tube 1122 is connected to the positive electrode of the corresponding DC source 300. The first end of the third switch tube 1124 is electrically connected and serves as the first output end of the conversion circuit 130, and the second end of the second switch tube 1123 is electrically connected to the ...

Embodiment 3

[0071] Referring to the above-mentioned embodiments, in the technical solution of the present invention, the control module can control the conduction or cut-off of each switch tube in each conversion circuit 130, and divide the working state of the cascaded multilevel converter into the first conduction state and the second conduction state. Two conduction states. It should be noted that each switch in the switch group module 110 is in a normally-off state when the self-test system performs self-test.

[0072] Figure 5 It is an equivalent circuit when the cascaded multilevel converter provided by Embodiment 3 of the present invention is in the first conduction state. Also refer to image 3 , the detection current in the cascaded multilevel converter will flow from the second output end of the first conversion circuit 130 into the first output end of the second conversion circuit in the first conduction state, and pass through each conversion circuit 130 in turn , finally ...

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Abstract

The invention discloses a self-checking system and a self-checking method for a cascaded multilevel converter. The self-checking system for the cascaded multilevel converter comprises a cascaded multilevel converter and a self-checking device, wherein the cascaded multilevel converter comprises at least two converting circuits which are cascaded, the self-checking device comprises at least one current detecting circuit, a voltage acquisition module and a computation module; the current detecting circuit is used for detecting a first detection circuit and a second detection circuit, the voltage acquisition module is used for acquiring a first busbar voltage and a second busbar voltage, and the computation module is used for acquiring insulation resistance of the cascaded multilevel converter according to the first detection current, the second detection current, the first busbar voltage and the second busbar voltage. The self-checking system provided by the invention can detect the insulation resistance of the cascaded multilevel converter, so that too heavy leakage current due to too low integral insulation resistance is avoided, and potential safety hazard can not be caused.

Description

technical field [0001] The invention relates to the technical field of cascaded multilevel converters, in particular to a self-inspection system and a self-inspection method for cascaded multilevel converters. Background technique [0002] Cascaded multilevel converters (cascaded multilevel converters, CMC) are widely used in applications such as power conversion, high-voltage variable frequency drive, high-voltage direct current transmission, and reactive power compensation. They are generally composed of single-phase switching bridges or half-bridge inverter circuits in series. Among them, the overall insulation resistance of the cascaded multilevel converter must be large enough to ensure that there will be no safety hazard caused by excessive leakage current due to too small overall insulation resistance during use. [0003] Cascaded multilevel converters need to use special circuits for leakage current protection and insulation resistance detection during use. This requ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/483G01R27/14G01R31/50
CPCG01R27/14H02M7/48H02M7/483H02M1/0009H02M7/4803H02M1/007H02M1/32H02M7/49G01R31/40G01R31/52G01R31/50H02M3/158G01R27/18G01R31/14
Inventor 刘宝其肖永利薛丽英曾志槐
Owner SUNGROW POWER SUPPLY CO LTD
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