Distributed power grid connection device

Abstract

The invention provides a distributed power grid connection device, comprising a power quality monitoring and metering module, a main processor and an execution module, wherein the power quality monitoring and metering module comprises a sampling unit and a measurement processor, the sampling unit is used for acquiring current signals and voltage signals which are output by a distributed power inverter, the current signals comprise AC current components and DC current components, and the measurement processor is used for implementing real-time power quality analysis according to the current signals and the voltage signals obtained by the sampling unit and outputting power quality analysis results; the main processor is used for outputting corresponding control signals according to the power quality analysis results output by the measurement processor; and the execution module is used for executing corresponding action based on the control signals to establish a connection between a distributed power supply and a public power grid or to break the connection therebetween. By adopting the distributed power grid connection device provided by the invention, the electric power output by a grid-connected distributed power inverter can be monitored in real time, the connection can be timely broken once the power quality is found unqualified, and thus the power utilization safety and power quality of users can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of grid connection, in particular to a distributed power grid connection device. Background technique [0002] In December 2012, the first domestic self-built distributed photovoltaic power generation system (low-voltage distributed power) was connected to the grid in Qingdao City, which opened a new chapter in the development of distributed power in my country. With the introduction of a series of national incentive policies and With the development of new power generation technology of renewable energy, distributed power supply has gradually become an ideal solution that can meet the demand of load growth and conform to the concept of green environmental protection advocated by the country. The connection of distributed power to the public grid makes the power system, especially the power distribution system, more decentralized, and the user's dependence on large power plants and transmission lines will be ...

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Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is that the existing distributed power grid connection cannot disconnect the connection with the public grid when the quality of its output power is unqualified, so it is easy to cause the power quality of the public grid to decline

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