Insulation safety assessment method and system of photovoltaic low-voltage crossing mobile detection apparatus

A mobile detection device and low-voltage ride-through technology, which is applied in the direction of measuring device, measuring electricity, measuring electrical variables, etc. The effect of ensuring system security

Active Publication Date: 2015-08-26
CHINA ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 t

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  • Insulation safety assessment method and system of photovoltaic low-voltage crossing mobile detection apparatus
  • Insulation safety assessment method and system of photovoltaic low-voltage crossing mobile detection apparatus
  • Insulation safety assessment method and system of photovoltaic low-voltage crossing mobile detection apparatus

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Example Embodiment

[0044] Example 1:

[0045] The invention of this example provides an insulation safety assessment method and system for a high-altitude photovoltaic low-voltage ride-through mobile detection device; a 35kV low-voltage ride-through detection device applied in a 3000M altitude area is used for illustration. The method includes:

[0046] Step 1: Analyzing the magnitude of the switch overvoltage in the low voltage ride through detection device through simulation software;

[0047] Step 2: Determine the correction value of overvoltage at high altitude through the altitude and voltage insulation correction table;

[0048] Step 3: Calculate the electric field strength of the overvoltage maximum value system corrected by finite element analysis software;

[0049] Step 4: Determine the insulation safety factor.

[0050] In step 1 include:

[0051] Step 1-1: constructing an equivalent circuit for switching loads in the low-voltage ride-through detection device;

[0052] Step 1-2: Ca...

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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 present invention relates to the technical field of insulation safety assessment, and more specifically to an insulation safety assessment method and system for 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 connection of new energy power stations does not have a major impact on the power grid and that changes in the operating status of the power grid do not affect the safety of equipment in new energy power stations, countries have formulated standards for grid connection and grid connection testing of new energy power stations. Only after passing the grid-connection inspection of relevant institutions and obtaining the grid-connection qualification, can the new energy power station be conn...

Claims

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Application Information

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IPC IPC(8): G01R31/00
Inventor 王德顺陈梅丁杰杨波华光辉俞斌姬联涛孔爱良赵上林刘欢桑丙玉陶以彬李官军
Owner CHINA ELECTRIC POWER RES INST
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