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PID resistant device for solar photovoltaic component using non-isolated inverter

A solar photovoltaic and inverter technology, applied in photovoltaic power generation, photovoltaic modules, electrical components, etc., to avoid adverse effects

Inactive Publication Date: 2015-04-08
JA YANGZHOU SOLAR PHOTOVOLTAIC ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The negative pole of the battery panel using the isolated inverter system can be grounded, but the negative pole of the solar photovoltaic module using the non-isolated inverter cannot be grounded, and the battery electrode voltage may be negative to the ground frame potential, which will cause serious PID Problem, due to the low potential of the negative terminal, components close to the negative terminal are more prone to PID problems

Method used

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  • PID resistant device for solar photovoltaic component using non-isolated inverter

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Embodiment Construction

[0021] Such as figure 1 As shown, the anti-PID device of the present invention can be applied to the solar photovoltaic module 11 that has adopted the non-isolated inverter 12, and it includes DC power supply, timer 4, control circuit 5, grounding switch 6, diode, sampling resistor 7 and normal closed contactor 10.

[0022] The DC power supply is provided with a power ground terminal 8, a high voltage output terminal and a working voltage output terminal. The working voltage output terminal provides the working voltage for the control circuit 5. The power supply ground terminal 8 is grounded and connected with the solar photovoltaic module 11 through the ground switch 6 and the sampling resistor 7 in turn. The frame PE is electrically connected, and the high-voltage output terminal outputs a forward-to-ground direct current close to the open-circuit output voltage value of the solar photovoltaic module 11. The high-voltage output terminal is electrically connected to the anode...

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Abstract

The present invention discloses a PID resistant device for a solar photovoltaic component using a non-isolated inverter. The device comprises a direct current power supply, a grounding switch, a diode, a timer and a control circuit. The PID resistant device of the present invention is able to automatically apply a positive to-earth direct current close to an open-circuit output voltage value of the solar photovoltaic component between the cathode at the voltage output of the solar photovoltaic component when the solar photovoltaic component is at a night inactive state, thereby counteracting the influence caused by the fact that the cathode at the voltage output of the solar photovoltaic component is at a negative voltage in the daytime, and realizing the suppression of PID phenomenon and performance recovery for the solar photovoltaic component and achieving the restoration of polarization effect generated in the daytime; furthermore, when the solar photovoltaic component is at an electricity generation state at the day time, the grounding switch 6 is automatically opened so as to effectively prevent the PID resistant device of the present invention from influencing the normal operation of the solar photovoltaic component.

Description

technical field [0001] The invention relates to an anti-PID device, and the anti-PID device can be applied to a solar photovoltaic module using a non-isolated inverter. Background technique [0002] PID effect Potential-induced attenuation means that the performance of solar photovoltaic modules will be attenuated when the electrode voltage is negative to the earth voltage. The voltage of some three-phase solar power generation systems can be as high as 1000V, and the attenuation of the modules will be more serious. In order to avoid PID potential-induced attenuation, the potential of the battery unit relative to the surrounding environment should not be less than zero. If the negative pole of the battery module is grounded, the potential of each battery unit of each module will be positive, which can well avoid the PID problem. The negative electrode of the battery panel using the isolated inverter system can be grounded, but the negative electrode of the solar photovoltaic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S40/30H02S40/32
CPCH02S40/00Y02E10/50
Inventor 龚铁裕相海涛
Owner JA YANGZHOU SOLAR PHOTOVOLTAIC ENG
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