Insulation safety assessment method and system for photovoltaic low-voltage ride-through mobile detection device

Abstract

The invention relates to an insulation safety assessment method and system of a photovoltaic low-voltage crossing mobile detection apparatus. The method comprises determining the amplitude of switch overvoltage in the low-voltage crossing detection apparatus; determining the electric field intensity of the maximum overvoltage in an overvoltage crossing detection apparatus; and according to the amplitude of the switch overvoltage and the electric field intensity, determining the insulation safety coefficient of the low-voltage crossing detection apparatus. The technical scheme provided by the invention guarantees safe and reliable insulation of the low-voltage crossing detection apparatus.

Description

Technical field: [0001] The invention relates to the technical field of insulation safety assessment, and more particularly to a method and system for insulation safety assessment of a high-altitude photovoltaic low-voltage ride-through mobile detection device. Background technique: [0002] New energy power generation technology has developed rapidly around the world, and a large number of grid-connected new energy power stations have been established. In order to ensure that the grid-connected access of new energy power stations will not have a great impact on the power grid and that changes in the operating state of the power grid will not affect the equipment safety of new energy power stations, countries have formulated grid-connected access standards and grid-connected testing standards for new energy power stations. Only after passing the grid connection test of relevant institutions and obtaining the grid connection qualification, the new energy power station can be ...

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Problems solved by technology

[0005] ①: Due to the strengthening of the insulation level of the reactor, this method will generate a large cost of raw materials, and the volume and weight of the reactor will also increase accordingly, which will also have a certain negative impact during the construction and installation process

[0006] ②: Add a surge arrester, which can suppress the amplitude of the switch operation overvoltage to a certain extent, but the voltage wave head of the switch overvoltage, re-ignition overvoltage, etc. The restriction is also limited, and it has a certain impact on the inter-turn insulation level of the reactor

[0007] However, even if the above-mentioned measures are installed, it cannot completely avoid the safety and reliability of the insulation of the low-voltage ride-through detection device.

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