Photovoltaic combiner box and its anti-reverse diode installation analysis method and device
A technology of anti-reverse diodes and photovoltaic combiner boxes, which is applied in photovoltaic power generation, photovoltaic modules, photovoltaic system monitoring, etc., and can solve problems such as power loss
Active Publication Date: 2018-05-25
ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY +2
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However, in this patent, while the anti-reverse diodes prevent the circulation between the strings, a certain voltage drop (about 0.7V) will be generated during the working process, and a certain power loss will be generated correspondingly.
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[0072] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0073] An embodiment of the present invention provides a photovoltaic combiner box. Multiple sets of photovoltaic module strings are divided into positive and negative poles and enter the combiner box respectively. The combiner box includes:
[0074] A plurality of cables, a plurality of fuses, a circuit breaker, a lightning arrester and at least one anti-reverse diode;
[0075] One end of the m cables is respectively connected to the positive electrode of the...
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The embodiment of the invention provides a photovoltaic combiner box and a method and device for installation analysis of defend and counterattack diodes of a photovoltaic combiner box. The method comprises: the reverse current IZDW and the work voltage UZDW of a shielded photovoltaic battery pack are obtained according to a U-I characteristic curve; the work voltage UW of the shielded photovoltaic battery pack is determined according to the reverse current IZDW; it is determined whether the difference of the work voltage UW and the work voltage UZDW is smaller than a voltage error amplitude limiting or not; and if the difference of the work voltage UW and the work voltage UZDW is smaller than a voltage error amplitude limiting, the minimum number of the defend and counterattack diodes when the reverse current passes through the reverse current verification. According to the invention, the minimum number of the defend and counterattack diodes requiring to be installed can be analyzed to reduce current flowing backwards in the combiner box, reduce the power consumption caused by the conduction pressure drop of the defend and counterattack diodes and improve the operation efficiency of the photovoltaic power generation system when the local photovoltaic module is shielded.
Description
technical field [0001] The invention relates to a photovoltaic combiner box energy efficiency analysis technology, in particular to a photovoltaic combiner box and an anti-reverse diode installation analysis method and device. Background technique [0002] With the continuous development of the economy and the aggravation of environmental pollution, the development and utilization of renewable energy has become the general trend. According to the country's energy strategy, solar photovoltaic power generation technology can effectively solve the problem of energy shortage and reduce carbon emissions. How to improve the efficiency of photovoltaic power generation, it is extremely important to analyze the energy efficiency of each component and link of photovoltaic power generation. The combiner box is an important part of combining and summarizing the currents of several photovoltaic module strings and inputting them into the inverter. It is necessary to analyze and study the...
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IPC IPC(8): H02S50/00H02J1/10
CPCH02J1/10H02S50/00Y02E10/50
Inventor 杨晓波王婷王萍李文军周丽霞袁瑞铭易忠林沈宇丁恒春徐占河席晓宇
Owner ELECTRIC POWER RES INST STATE GRID JIBEI ELECTRIC POWER COMPANY