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Convergence detecting method and system for convergence box and solar power station

A detection method and technology of solar battery packs, which are applied in the field of solar power generation, can solve problems such as high current value exceeding the limit, failure to detect solar battery string faults, high fault false detection rate, etc., and achieve the effect of improving accuracy

Active Publication Date: 2015-07-08
DONGJUN NEW ENERGY CO LTD
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AI Technical Summary

Problems solved by technology

[0007] The disadvantage of this method is: for the morning and evening of every day, affected by light or shadow, it is very likely that some solar cell strings still generate electricity, but the current of the solar cell strings is small, while some components no longer generate electricity.
[0008] It can be seen that the existing fuse alarm judgment logic will introduce daily false positives
[0009] 2. Current low value cross limit method
[0011] The disadvantage of this method is that for multi-level confluence monitoring, the current value of each input terminal in the combiner box may be the sum of the currents of the multiple strings of battery components connected to the previous multi-level combiner box.
This kind of alarm signal due to changes in natural conditions will lead to a high false alarm rate
[0012] 3. Current high value over-limit method
However, first of all, this technical solution only takes into account the rate of change of one current, and does not take into account the current changes of the solar battery strings caused by the above-mentioned building shading and other conditions, and the fault false detection rate is still high; secondly, In the case of multi-level combiner boxes, this technical solution is only applicable to the current collection and detection between the output terminal of the last level combiner box and the inverter, but not for individual solar battery strings or upper level combiner boxes. The failure of the box is detected, so that the technician only knows that a failure has occurred, but does not know where the failure occurred
[0018] Regardless of any of the above detection methods, the current value or rate of change of a single input terminal or output terminal of the combiner box is measured in the time domain or frequency domain. The comparison of environmental factors cannot be ruled out, and the fault false alarm rate is high

Method used

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  • Convergence detecting method and system for convergence box and solar power station
  • Convergence detecting method and system for convergence box and solar power station
  • Convergence detecting method and system for convergence box and solar power station

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Embodiment Construction

[0035] reference figure 1 The figure shown is a part of a solar power station, that is, only a part of the photovoltaic array composed of two levels of confluence is shown. In practical applications, the photovoltaic array can continue to increase the level of confluence. The connection mode of the components in the photovoltaic array in this embodiment is: x (x≥1) solar panels form a solar battery string, and a first-level confluence of n-in-1 is adopted, that is, n solar battery strings pass through the same first-stage The input terminal 1 to the input terminal n of the combiner box are combined, and at the same time, the secondary combiner with m input 1 is adopted, that is, the current output from the output terminals of m primary combiner boxes passes through the input terminal 1 of the same secondary combiner box to the input The terminal m carries on the confluence, and finally is uniformly output from the output terminal of the secondary combiner box. i represents the...

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Abstract

The invention provides a convergence detecting method and system for a convergence box. During zero value judgment, current values of adjacent input ends or similar input ends are utilized for mutual verification, during mean value judgment, the number of solar battery pack strings actually connected to the input ends of the convergence box of the grade are taken into consideration for mean value judgment, during high-value out-of-limit and low-value out-of-limit judgment, change rates of the current values of the adjacent input ends or the similar input ends are mutually verified, and the fault judgment accuracy of the convergence box in a photovoltaic array is improved. The invention further provides a solar power station.

Description

Technical field [0001] The present invention relates to the field of solar power generation, in particular to a method and system for confluence detection for a combiner box, and a solar power station. Background technique [0002] With the increasing shortage of energy, the development and utilization of renewable green energy has attracted more and more people's attention, especially the use of solar energy is particularly favored by the world. As a clean, safe, sustainable and reliable energy source, solar photovoltaic systems are rapidly expanding their applications in energy and industrial technology development. In recent years, the development and application of photovoltaic cells and large-area photovoltaic modules as solar energy conversion media have attracted widespread attention. The wide application of solar panels represented by monocrystalline silicon, polycrystalline silicon, and amorphous silicon thin films in commercial and residential buildings has shown great...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/00H02S50/10H02S40/30
CPCH02S40/00H02S50/00Y02E10/50
Inventor 杨盛楠
Owner DONGJUN NEW ENERGY CO LTD
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