Uninterrupted parallel operation grid-connected system and grid-connected method of medium-voltage power supply vehicle

Abstract

The present invention discloses an uninterrupted parallel operation grid-connected system of a medium-voltage power supply vehicle. The system comprises a pole-mounted switch and a power supply vehicle, a generator set, a mains supply input end, a load output end, a mains supply input circuit breaker and a load output circuit breaker are arranged in the power supply vehicle, and the generator setis connected to the input end of the load output circuit breaker in parallel through an oil engine input circuit breaker; the mains supply input end is connected with the power-on side of the pole-mounted switch through an input load switch, and the load output end is connected with the power transmission side of the pole-mounted switch through an output load switch. According to the invention, anIM-NT module, an IG-NT module and an IG-AVRI module are adopted to control the system, the voltage and the frequency of the generator can be controlled to be consistent with those of a mains supply,grid connection reliability and multiple safety protection are guaranteed, and values can be set according to load values to meet the requirement for sudden change of load cardinal numbers. The present invention further perfects an uninterrupted grid-connected operation method of a reliable source vehicle, the problem of mains supply backflow is avoided, accidents are reduced, and the operation failure rate is reduced.

Description

technical field [0001] The invention relates to the field of emergency power supply vehicles, in particular to a system and grid connection method for a medium-voltage power supply vehicle without power failure. Background technique [0002] In recent years, with the continuous upgrading of the power system, 10kv distribution lines and equipment have become an important part of my country's power grid. However, due to the impact of environmental factors and emergencies, sudden power outages often occur in large areas. It is also impossible to quickly repair the faults, resulting in a long-term failure of power supply and heavy economic losses. At present, power supply vehicles have been popularized and applied in emergency power protection, but in large-area 10kv distribution network without power outage operations, often due to uncertain factors of load size, the load base of power supply vehicles cannot be correctly set. When the setting is too high, it will The phenomenon...

AI Technical Summary

Problems solved by technology

[0002] In recent years, with the continuous upgrading of the power system, 10kv distribution lines and equipment have become an important part of my country's power grid. However, due to the impact of environmental factors and emergencies, sudden power outages often occur in large areas. It is also impossible to quickly repair the faults, resulting in power failure for a long time and heavy economic losses

At present, power supply vehicles have been popularized and applied in emergency power protection, but in large-area 10kv distribution network without power outage operations, often due to uncertain factors of load size, the load base of power supply vehicles cannot be correctly set. When the setting is too high, it will The phenomenon of converging to the main power grid occurs; if the setting is too low, it will cause insufficient start-up, resulting in grid-connection failure and failure to start and maintain power normally; and there is no standardized and reliable grid-connection operation process for live work without power failure during the operation, which may easily lead to operation Failure, and mains backflow phenomenon occurs, resulting in accidents

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