Grounding isolation device based on low-frequency power transmission system

Abstract

The invention discloses a grounding isolation device based on a low-frequency power transmission system, and the device comprises a first AC power grid which is disposed on an island; the second alternating-current power grid is arranged on the coast; the power transmission cable is used for establishing connection between the first alternating-current power grid and the second alternating-currentpower grid; the grounding isolation device is arranged between the first alternating-current power grid and the second alternating-current power grid; the input end of the AC/AC frequency conversiondevice is connected with the grounding isolation device through a power transmission cable, the output end of the AC/AC frequency conversion device is connected with the second AC power grid and usedfor converting the first frequency three-phase voltage of the first AC power grid into the second frequency three-phase voltage, and the first frequency is smaller than the second frequency. By arranging the grounding isolation device, the overvoltage phenomenon of the low-frequency power transmission system in the power transmission process can be reduced; therefore, the insulation level of the grounding isolation device of the low-frequency power transmission system is reduced, the safety of low-frequency power transmission of the low-frequency power transmission system is ensured, and zero-sequence current generated by asymmetric faults can be isolated through the reasonable wiring mode of the grounding isolation device.

Description

technical field [0001] The invention relates to the field of power system transmission, in particular to a ground isolation device based on a low-frequency power transmission system. Background technique [0002] Energy is an important material basis for economic and social development. Accelerating the establishment of a safe, reliable, cost-effective, clean and environmentally friendly modern energy supply system has become a common strategic goal of all countries in the world. In order to effectively solve the problems of energy depletion and environmental pollution, the development of new energy has become the only way to meet the three major challenges of energy security, environmental pollution, and climate change, and to realize the sustainable development of human society. Wind power generation is one of the most mature and large-scale development conditions among new energy power generation technologies. In some areas, the distribution of wind power resources and l...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the embodiments of the present invention is that in the process of long-distance power transmission in the power transmission system in the prior art, there are often some discharge phenomena in cables or electrical equipment, resulting in overvoltage in the power transmission system, which in turn causes power transmission. The insulation performance of the system is reduced, which is not conducive to the safe transmission and stable operation of the transmission system

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