Distributed photovoltaic intelligent grid connection box

Abstract

The invention relates to a distributed photovoltaic intelligent grid connection box. The distributed photovoltaic intelligent grid connection box comprises an operating mechanism for driving closing and opening and a central control unit capable of receiving current information of a current detection device, performing processing and logic analysis on the current information and outputting a control instruction to control the opening and the closing of the operating mechanism after judging that the current fails, wherein the central control unit performs sampling and analytical judgment by using a conventional sampling and dense sampling combined mode; the operating mechanism performs opening driving action through a repulsion coil, a demagnetizing coil, an opening spring and an opening coil; thus, the purposes of quick action, quick outlet protection and quick fault cut-off are realized from software and hardware, the reliability of a micro-grid in the grid connection or isolated network operation state and the stable transition between grid connection / isolated network modes can be powerfully guaranteed, and the equipment cost is obviously reduced on the premise of meeting the special usage requirements of the micro-grid.

Description

technical field [0001] The invention relates to a distributed photovoltaic intelligent grid-connected box, which is mainly used for connecting photovoltaic power sources to a large power grid and realizing the intelligence of grid-connection and off-grid, and can also be used for the connection between micro-grids or other similar systems and large power grids. Background technique [0002] With the development of the national economy, the demand for electricity has grown rapidly, and the scale of the power grid has continued to expand. However, the disadvantages of the ultra-large-scale power system have become increasingly prominent, such as high cost and difficult operation, and it is difficult to adapt to the increasingly high safety and reliability requirements of users and the diverse customized power supply needs. Photovoltaic distributed power generation advocates the principle of nearby power generation, nearby grid connection, nearby conversion, and nearby use. It ...

AI Technical Summary

Problems solved by technology

[0005] (2) An unexpected island effect is produced. When the large power grid is out of power due to failure or maintenance, distributed photovoltaics still supply power to the loads on the outage line, endangering the safety of people and equipment, and affecting the operation and maintenance safety of the distribution network.

[0006] The above problems lead to obstacles to the development of grid-connected distributed photovoltaic power generation, affecting the development prospects of grid-connected distributed photovoltaic power generation

Images