Method and device for inhibiting PID effect of photovoltaic module in inverter

A photovoltaic module and inverter technology, applied in the field of eliminating the PID effect of photovoltaic modules, can solve problems such as high cost, lower system safety level, and potential safety hazards, and achieve the effect of eliminating the ionosphere, simplifying the device structure, and suppressing the PID effect.

Active Publication Date: 2016-06-29
NANJING SCIYON AUTOMATION GRP
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  • Abstract
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Problems solved by technology

Both of the above two inventions can effectively suppress the PID effect of photovoltaic modules, but they need to be connected to an external power supply or connected to the power grid, and the cost is relatively high, and the introduction of the negative electrode into an external power supply reduces the safety level of the system, posing potential safety hazards

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  • Method and device for inhibiting PID effect of photovoltaic module in inverter

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Embodiment Construction

[0032] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0033] like figure 1 As shown, a device for suppressing the PID effect of photovoltaic modules in an inverter, which includes a voltage sampling module 1, a voltage sampling module 2, an insulation resistance detection device, a control unit, a switch S1, a switch S2, a switch S3, and a switch S4 , current limiting resistor R1, energy storage capacitor C1, grounding terminal PE. The switch S1, the switch S2, the switch S3 and the switch S4 all adopt electric control switches.

[0034] Wherein: the acquisition terminal of the voltage sampling module 1 is connected to the positive output terminal and the negative output terminal of the photovoltaic module respectively, and its signal output terminal is connected to the signal input terminal of the control unit for obtaining the sampling voltage signal 1 and transmitting it to the control unit. The acquisition end of ...

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Abstract

The invention discloses a method and device for inhibiting the PIED effect of a photovoltaic module in an inverter.The method comprises the steps that when the inverter is shut down, electric energy emitted by the photovoltaic module is used for applying a forward voltage to the position between a negative electrode of the photovoltaic module and the ground, and an ionized layer on the photovoltaic module is eliminated.According to the method and device, the electric energy emitted by the photovoltaic module is fully utilized, a forward electric field is applied to the position between the negative electrode and the ground, and the PID effect can be effectively inhibited.The device is simple in structure, safe and reliable, and the defects in the prior art are overcome.

Description

technical field [0001] The invention belongs to the field of photovoltaic power generation, and in particular relates to a method and a device for eliminating the PID effect of a photovoltaic module applied in a photovoltaic inverter. Background technique [0002] When photovoltaic cell modules work under negative bias voltage for a long time, it is easy to produce PID effect, that is, potential potential induced attenuation phenomenon. PID effect will lead to a significant drop in module power, seriously affecting the power generation capacity of the photovoltaic system, and directly affecting the actual power generation of the photovoltaic power station. [0003] The reason for the PID effect is that the aluminum alloy frame of the photovoltaic module is a metal conductor, and the tempered glass used for packaging contains a large amount of sodium and iron elements, and the volume resistivity of the photovoltaic cell packaging film (EVA) is not very high. Partial leakage c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/30
CPCH02S40/30Y02E10/50
Inventor 曹瑞峰谭理华黄存荣
Owner NANJING SCIYON AUTOMATION GRP
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