Photovoltaic system fault arc detection method under common-mode signal interference condition

A photovoltaic system and fault arc technology, which is applied in the monitoring of photovoltaic systems, photovoltaic power generation, photovoltaic modules, etc., can solve problems such as misoperation, achieve the effects of improving economic benefits, ensuring reliable and stable operation, and extending effective power generation time

Active Publication Date: 2015-07-29
CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the DC fault arc protection device is affected by the common mode signal and cause malfunction when the photovoltaic system has a fault arc, and provides a photovoltaic system fault arc detection method under the condition of common mode signal interference

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  • Photovoltaic system fault arc detection method under common-mode signal interference condition
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  • Photovoltaic system fault arc detection method under common-mode signal interference condition

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[0041] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0042] see Figure 1a , a photovoltaic system arc fault detection method under the condition of common-mode signal interference: when it is confirmed that no arc fault event occurs in the photovoltaic system, the balance gain in the balance correction output device is adjusted to avoid any gap between two adjacent photovoltaic strings in the photovoltaic system. In the case of differential signal output due to factors such as uneven illumination or the number of photovoltaic modules contained, it is ensured that the differential signal output between any adjacent photovoltaic strings in the photovoltaic system is only caused by fault arcs; The detection signals between photovoltaic strings are processed by differential conversion to eliminate the common-mode signal components contained in the detection signals of the photovoltaic system caused by facto...

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Abstract

The invention discloses a photovoltaic system fault arc detection method under the common-mode signal interference condition. The nonzero differential signal output between adjacent photovoltaic clusters through gain calibration, the situation that input signals of a direct-current fault arc detection device are influenced by differential factors except the fault arc events is excluded, detection signals between any adjacent photovoltaic clusters of a photovoltaic system are processed through differential conversion, the fault arc detection is conducted through the direct-current fault arc detection device by means of the differential signals, fault photovoltaic modules are cut off when fault arcs happen, and the photovoltaic system unceasingly runs till the balance gain exceeds the set range. The method solves the problem that when the direct-current fault arc detection module detects the electricity quantity of a normal line, due to the influences of common-mode signals, maloperation is caused. It is avoided that the full system stops running when local fault arcs happen, and the fault arc positioning and protecting capacity of the system under the interference of the common-mode signals is improved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic electrical fault detection, and specifically relates to a method based on balance gain correction to compensate for non-zero differential signal output when no fault arc event occurs, and to eliminate photovoltaic system detection based on differential conversion processing detection signals between any two adjacent photovoltaic strings The common mode signal component contained in the signal, and the operating status of the photovoltaic system are judged based on the current set value of the balance gain, so as to realize the method that the photovoltaic system can locate and remove the faulty photovoltaic module to stably output the maximum power. Background technique [0002] Along with the requirements of global non-renewable energy intensive development and sustainable development, photovoltaic power generation systems using solar energy as primary energy have been widely promoted and put...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02S50/00
CPCH02S50/00Y02E10/50
Inventor 李兴文陈思磊屈建宇
Owner CHANGSHU SWITCHGEAR MFG CO LTD (FORMER CHANGSHU SWITCHGEAR PLANT)
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