A realization method of preventing pid effect of photovoltaic panels

Abstract

The invention provides an achieving method for preventing photovoltaic cell panel PID effect. The method comprises the steps that first, a PID effect energy recovering unit is established; second, when voltages of N photovoltaic cell pack strings sampled by the PID effect energy recovering unit are lower than a set threshold value, the PID effect energy recovering unit is cut into a photovoltaic generating system; and any photovoltaic cell pack string voltage of the N photovoltaic cell pack string voltages sample by the PID effect energy recovering unit is larger than the set threshold value, the PID effect energy recovering unit is cut out of the photovoltaic generating system. Under the premise that working of a photovoltaic inverter is not affected, the problem of photovoltaic cell panel output power attenuation caused by a photovoltaic cell component PID phenomenon is solved.

Description

technical field [0001] The invention relates to a method for effectively recovering the problem of output power degradation of photovoltaic cell panels caused by the PID (English full name PotentialInducedDegradation) effect of photovoltaic modules, belonging to a photovoltaic module power generation system. Background technique [0002] The PID effect is a relatively new attenuation effect that has appeared in the photovoltaic field in recent years. With the gradual popularization and application of photovoltaic grid-connected systems, the system voltage is getting higher and higher, and the pressure of the cells inside the module relative to the ground is getting higher and higher. The aluminum frame of the photovoltaic module generally requires grounding, and the circuit in the crystalline silicon photovoltaic module A negative high voltage is formed between it and its grounded metal frame. Under the action of the high voltage, ion migration will occur in the encapsulati...

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Problems solved by technology

[0004] 1. Connect a PID power supply to each independent input of the photovoltaic inverter, and apply a positive voltage between the module and the ground through the power supply, but the current photovoltaic inverter generally has multiple independent MPPTs (English full name is called MaximumPowerPointTracking, maximum power point tracking) controller, if each independent component is connected to a PID power supply, it will increase the cost and cause waste of system cost

[0005] 2. The PID effect can be avoided by grounding the negative pole of the photovoltaic panel, but most of the photovoltaic systems on the roof of residential buildings and commercial buildings and the photovoltaic power generation systems that have been built in power stations, the photovoltaic panels are in the form of floating ground, and this type of system does not support Ground the negative terminal of the battery

[0006] 3. The patent title is "Passivation anti-reflection film for solar cells capable of resisting PID effect", and the patent publication number is "CN103022160A". Although the patent can prevent PID effect, it is from the perspective of battery manufacturing. of photovoltaic systems are powerless

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