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Method and circuit for detecting insulation resistance

A technology of insulation resistance and detection circuit, applied in impedance measurement, measurement of electrical variables, measurement of resistance/reactance/impedance, etc., can solve the problem of lack of insulation resistance detection circuit, etc., to achieve the effect of PID suppression

Active Publication Date: 2014-08-13
SUNGROW POWER SUPPLY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the present invention provides an insulation resistance detection method and circuit to solve the problem of the lack of an insulation resistance detection circuit that can simultaneously realize the PID suppression function in the prior art

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  • Method and circuit for detecting insulation resistance

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Embodiment Construction

[0044] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. 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.

[0045] The invention provides an insulation resistance detection method to solve the problem in the prior art that there is no insulation resistance detection circuit capable of simultaneously realizing the PID suppression function.

[0046] Specifically, the insulation resistance detection method is applied to the insulation resistance detection circuit of the battery board, and the insulation resistance detection circuit includes: a controller, a detection ci...

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Abstract

The invention discloses a method and circuit for detecting insulation resistance. A controller controls turn-on and turn-off of a PID suppression circuit and then controls turn-on and turn-off of the circuit for detecting insulation resistance, and then insulation resistance against the ground of a cell panel can be detected; whether the insulation resistance against the ground of the cell panel is larger than a preset value or not is judged; when it is judged that the insulation resistance against the ground of the cell panel is smaller than or equal to the preset value, insulation resistance faults are reported; when it is judged that the insulation resistance against the ground of the cell panel is larger than the preset value, an inverter is controlled to be started, then the PID suppression circuit is controlled to be turned on, and then suppression of the PID effect is achieved. Detection on the insulation resistance against the ground of the cell panel is achieved before grid connection of the inverter, the function of suppressing PID is achieved, and the problems in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of photovoltaic power generation, in particular to an insulation resistance detection method and circuit. Background technique [0002] At present, in the photovoltaic power generation system, for non-isolated photovoltaic grid-connected inverters, it is necessary to ensure that the insulation resistance between the photovoltaic panels and the ground (GND) is large enough before operation, so it is necessary to detect the insulation resistance of the panels to the ground . [0003] At the same time, under the action of a high voltage of a specific polarity for a long time, there will be a leakage current between the glass and the packaging material, and a large amount of charge will accumulate on the surface of the cell, which will deteriorate the passivation effect of the cell surface and cause the fill factor of the cell panel to decrease. , short-circuit current, and open-circuit voltage decrease. This p...

Claims

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Application Information

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IPC IPC(8): G01R27/02G01R27/18
Inventor 徐清清杨本和邢军耿后来李浩源梅晓东
Owner SUNGROW POWER SUPPLY CO LTD
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