Photovoltaic PID elimination circuit and method
A high-voltage induced attenuation and circuit elimination technology, applied in photovoltaic power generation, photovoltaic modules, electrical components, etc., to achieve the effect of subtracting sampling control logic, adding fault protection function, and simple system
Active Publication Date: 2015-06-03
SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD
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Problems solved by technology
At present, there are different opinions on the real reason for the PID effect of photovoltaic modules, but the actual operation of the power station and the research results show that the PID phenomenon will occur when the photovoltaic module is under negative bias voltage, and the greater the negative bias voltage, the more obvious the PID phenomenon
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[0014] refer to figure 1 , the photovoltaic PID elimination circuit is connected to the PID prevention unit 3 located between the negative pole PV- of the photovoltaic panel and the ground pole PE, and is connected to the AC or DC input power supply 1 of the grid power supply system, the switching power supply 2, the comparison circuit 4 and The output unit 5 is composed of an AC input power supply 1 connected to a switching power supply 2, and the switching power supply 2 is respectively connected to a PID prevention unit 3 and a comparison circuit 4 to convert the AC power from the AC input power supply 1 to generate an isolated DC high voltage and generate a comparison The voltage is used as a reference input terminal of the comparison circuit 4, and the PID prevention unit 3 is activated when the output isolated DC high voltage meets a preset rated value.
[0015] The other input terminal of the comparison circuit 4 is connected to the PV voltage, and controls the relay of...
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The invention discloses a photovoltaic PID (Potential Induced Degradation) elimination circuit which is mainly composed of an AC (Alternating Current) input power supply, a switching power supply, a comparison circuit and an output unit, wherein the AC power supply generates an isolated DC (Direct Current) high voltage via the switching power supply, while the switching power supply generates a comparison voltage; the comparison voltage is taken as a reference of a comparison circuit; when the PV voltage is higher than the comparison voltage, the comparison circuit disconnects a relay of the output unit, so as to close the output of a PID prevention unit; when the PV voltage is less than the comparison voltage, the comparison circuit closes the relay of the output unit, so as to open the output of the PID prevention unit. Meanwhile, the PV voltage is input to a blockade circuit, and when any PV voltage is higher than a blockade threshold, the whole circuit of the PID prevention unit is turned off.
Description
technical field [0001] The embodiment of the present invention relates to a low-cost circuit and method for eliminating the photovoltaic PID effect, belonging to the field of photovoltaic power generation manufacturing. Background technique [0002] There are PID prevention units inside or outside the photovoltaic machine to prevent the photovoltaic PID effect and are widely used in photovoltaic inverters and photovoltaic power plants. At present, there are different opinions on the real reason for the PID effect of photovoltaic modules, but the actual power plant operation and research results show that PID phenomenon will occur when photovoltaic modules are under negative bias voltage, and the greater the negative bias voltage, the more obvious the PID phenomenon. The PID phenomenon is not obvious when the photovoltaic module is under positive bias. Therefore, the PID effect can be prevented by grounding the negative electrode of the photovoltaic cell module or applying a...
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IPC IPC(8): H02S40/30
CPCH02S40/00Y02E10/50
Inventor 李新富欧余斯吴龙生
Owner SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD