Photovoltaic system DC side arc fault detection system and detection method thereof

Abstract

The invention relates to a photovoltaic system DC side arc fault detection system and a detection method thereof. According to the invention, a sampling inductor is connected in series on a circuit from the output of a combiner box to an inverter, a capacitor is connected in series with a primary side winding of a current transformer and then connected in parallel with two ends of the sampling inductor, a secondary side winding of the current transformer collects a characteristic alternating current signal of the DC side arc and sends the characteristic alternating current signal to a filtering and amplification circuit, and a current signal outputted and processed by the filtering and amplification circuit is sent to a digital signal processor for judgment, and then a judgment result is outputted and then transmitted through a communication module. The detection method comprises the steps of collecting an alternating current signal at the DC side of the photovoltaic system, and extracting signal characteristics in the frequency domain; pre-judging the signal; training a GAN (Generative Adversarial Network) model; and judging a DC fault arc and sending alarm information. In order to reduce the false detection rate and improve the robustness of the detection system, the generative adversarial network is introduced into the judgment of the fault arc. The false detection rate of the DC fault arc can be reduced, the detection rate is improved, and the safe and stable operation of the photovoltaic system at the DC side is ensured.

Description

technical field [0001] The invention relates to a photovoltaic DC fault arc detection technology, in particular to a photovoltaic system DC side arc fault detection system and detection method based on a Generative Adversarial Network (GAN). Background technique [0002] As a green and environmentally friendly new energy product, photovoltaic power generation system has been rapidly developed and widely used all over the world in recent years. As large "solar fields" of large numbers of solar panels continue to evolve into increasingly smaller residential and commercial installations, there is an increasing need to build in safety measures to avoid catastrophic events related to high voltages that Usually caused by an arc fault. When a line or electrical connection fails, high voltage DC lines can create electrical arcs that can electrify a device, possibly electrocuting anyone who comes into contact with the device, or even causing a fire that can cause extensive property ...

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problems that the traditional arc fault detection device on the DC side of the photovoltaic system is easily disturbed, the accuracy rate is low, and the false detection rate is high, the invention proposes a DC side arc fault detection system and detection method of the photovoltaic system. Judgment and GAN classification judgment can accurately detect the occurrence of DC fault arc during the operation of the photovoltaic system, so as to block the DC fault arc in time and ensure the safe operation of the photovoltaic system

Images