Method and device for suppressing ground common mode voltage of inverter AC cable

A common-mode voltage and suppression device technology, which is applied in the direction of irreversible DC power input conversion to AC power output, without intermediate conversion to AC conversion equipment, emergency protection circuit devices, etc., can solve personal electric shock, high cost and other problems , to avoid the risk of electric shock

Active Publication Date: 2017-03-08
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a method and device for suppressing the common mode voltage of the inverter AC cable to the ground to solve the need to avoid the common

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  • Method and device for suppressing ground common mode voltage of inverter AC cable
  • Method and device for suppressing ground common mode voltage of inverter AC cable
  • Method and device for suppressing ground common mode voltage of inverter AC cable

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[0044] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] The present invention provides a device for suppressing the common mode voltage of an inverter AC cable to the ground, so as to solve the need to avoid the common mode voltage of the AC cable to the ground caused by a high-cost solution when performing off-grid maintenance on the inverter in the prior art. The problem of personal electric shock.

[0046] Specifically, the device for suppressing the common mode voltage of the inverter AC cable to the ground, such as image 3 As shown, it includes: a control unit 101, a switch unit 102 and a discharge unit 103; among them:

[0047] The output terminal of the control unit 101 is connected to the input terminal of the switch unit 102;

[0048] One end of the switch unit ...

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Abstract

The present invention provides a method and device for suppressing the ground common mode voltage of an inverter AC cable. Through a control unit, a control signal is generated according to inverter alternating current side voltage. The switch unit disconnects or connects the connection between a discharge unit and a reference ground according to the control signal. Finally, the discharge unit discharges the ground common mode voltage of an inverter AC cable, thus the discharge of the ground common mode voltage of the inverter AC cable is carried out through the discharge unit when the switch unit is switched on. The discharge of the ground common mode voltage of an inverter AC cable is realized in switching off an alternating current switch to maintain without an isolation sampling scheme with high cost and a high device insulation level requirement in the prior art, and the risk of electric shock to maintenance personnel is avoided.

Description

technical field [0001] The invention relates to the technical field of inverter common-mode voltage suppression, in particular to a method and device for suppressing the common-mode voltage of an inverter AC cable to ground. Background technique [0002] In view of safety and EMC requirements, it is inevitable to connect the corresponding safety capacitors at one or more places for the DC input to ground and the AC output to ground of the grid-connected inverter; figure 1 It is a schematic diagram of the insulation resistance and safety capacitor after the DC side and the AC side of the grid-connected inverter are equivalent to the ground, where R+(R-) represents the equivalent insulation resistance of the DC input positive pole (negative pole) to the ground, and Y+(Y- ) represents the equivalent Y capacitance to ground of the DC input positive pole (negative pole); Y1, Y2, Y3, and YN represent the equivalent Y capacitance to ground of the three-phase live wire (U, V, W) and...

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Application Information

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IPC IPC(8): H02M1/12H02J3/38
CPCH02J3/38H02M1/12H02M1/0038H02M1/123H02M7/48H02M1/007H10N60/20H02H7/122H02M3/07H02M7/5383
Inventor 汪昌友孙维郑群
Owner SUNGROW POWER SUPPLY CO LTD
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