Intelligent flexible switching device for photovoltaic power station

Abstract

The invention provides an intelligent flexible switching device for a photovoltaic power station. The intelligent flexible switching device is used in a photovoltaic power station system and comprises a line inlet end interface, a three-phase current and voltage acquisition and detection unit, a main switching unit, a control unit and a line outlet end interface, wherein the three-phase current and voltage acquisition and detection unit is used for detecting three-phase grid-connected current and voltage station information and feeding the detection information into the control unit; the main switching unit comprises a mechanical switch and an electronic power switch and is used for controlling whether the power generation system of the photovoltaic power station is accessed to a power grid or is separated from the power grid; and the control unit is used for automatically monitoring the whole system and controlling the main switching unit to turn on / turn off according to the received current and voltage station signal detected by the three-phase current and voltage acquisition unit and the control information in the control unit. An intelligent energy-saving system is controlled by the control unit to automatically operate according to the state of the photovoltaic power station; the power consumption of the intelligent energy-saving system is reduced while the intelligent energy-saving system can control flexibly; when the power station does not generate power, loss of a high-capacity transformer and a high-capacity inverter in the power station can be effectively reduced; and huge energy-saving earnings can be provided for operators of the power station.

Description

technical field [0001] The invention belongs to the field of new energy power generation in electric power systems, and in particular relates to an intelligent flexible switch device applied to a photovoltaic power station. Background technique [0002] With the continuous increase of global new energy installed capacity, especially the rapid growth of domestic photovoltaic power generation installed capacity, China has become the world's largest installed photovoltaic power generation capacity. It is estimated that the installed capacity of photovoltaic power generation will reach 49GW by the end of 2015. However, judging from the centralized photovoltaic power plants or distributed photovoltaic power plants that have been put into operation or will soon be put into operation, there is a common problem, that is, the photovoltaic power generation system has obvious timeliness, generating power during the day and shutting down at night. And whether it is day or night, if the ...

AI Technical Summary

Problems solved by technology

[0005] Adding mechanical high-voltage switches and control devices at the grid-connected point can solve the problem of disconnection from the grid-connected grid system when the remote control power station of the photovoltaic power station is not generating power, but this method cannot solve the huge impact on the large grid when the photovoltaic power generation system is put into the grid system. Impact, even when the photovoltaic power station is put into operation, the substation protection system at the far end of the power grid system will operate and trip

It affects the stability of the power grid power supply system. It is extremely bad in nature and has a great impact on the operation of the power station. Therefore, this method is not the best method and does not conform to the future technology development trend.

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