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Insulation resistance detection method and device for photovoltaic inverter

A photovoltaic inverter and insulation resistance technology, which is applied in the monitoring of photovoltaic systems, impedance measurement, photovoltaic modules, etc., can solve the problems of low economic and practical considerations, low real-time monitoring, and increased complexity, and achieve a working mode Single, simplified program complexity, and reduced hardware cost

Active Publication Date: 2019-11-19
ZTE CORP
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  • Claims
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Problems solved by technology

After research, it is found that most of the current insulation monitoring methods focus on the improvement of monitoring accuracy, and these methods generally bring about increased complexity, relatively low real-time monitoring, and little consideration in terms of economic practicability

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  • Insulation resistance detection method and device for photovoltaic inverter
  • Insulation resistance detection method and device for photovoltaic inverter
  • Insulation resistance detection method and device for photovoltaic inverter

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Embodiment Construction

[0033] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0034] The invention proposes an insulation resistance detection scheme for photovoltaic inverters, which realizes multi-channel insulation resistance detection and reduces hardware costs; moreover, in the insulation resistance detection, the electronic switch is turned on in time, and the working mode is single, which not only ensures a certain Accuracy requirements, but also simplify the program complexity.

[0035] Such as figure 1 As shown in FIG. 1 , an insulation resistance detection device for a photovoltaic inverter of the present invention is shown. The insulation resistance detection device of the photovoltaic inverter includes at least two detection modules 110, a control module 120, an acquisition module 130, and an MCU unit 140; The photovoltaic array is connected, and the detection module is controlled...

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Abstract

An insulation resistance tester using a photovoltaic inverter, comprising at least two detection modules (110), a control module (120), a sampling module (130) and an MCU (140); wherein, the control module (120) controls such that at a single moment only one detection module (110) is connected to a photovoltaic array of the photovoltaic inverter, and controls the detection modules (110) to be in different detection states; the sampling module (130) samples a voltage relative to ground of a positive and negative terminal respectively of the photovoltaic array when the detection module (110) connected to the photovoltaic array of the photovoltaic inverter is in different states; and the MCU (140) calculates an insulation resistance on the basis of a sampled voltage corresponding to each detection module (110). The device realizes multi-path insulation resistance detection, decreasing hardware costs.

Description

technical field [0001] The invention relates to the field of photovoltaic inverter power generation, in particular to a method and device for detecting insulation resistance of a photovoltaic inverter. Background technique [0002] For the safe use of photovoltaic inverters, through the positive and negative busbars to ground insulation resistance detection, when the insulation resistance value exceeds the limit value R = Vmaxpv / 30mA, a fault is indicated and the photovoltaic inverter is prohibited from being connected to the grid. However, since the photovoltaic array is placed outdoors, it is greatly affected by the environment. After a long period of exposure to the sun, rain, aging of photovoltaic modules, lightning strikes and other problems can cause changes in insulation resistance, the decrease in insulation resistance will cause the DC bus to discharge to the ground. In severe cases, the inverter may be damaged and a series of failures may occur. Therefore, the pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/18H02S50/10
CPCG01R27/20Y02E10/50
Inventor 魏学海李建国
Owner ZTE CORP
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