Distributed power supply grid connection interface device

Abstract

The invention discloses a distributed power supply grid connection interface device which comprises a shell. A field control panel and a display panel are disposed on the shell. A bus plate is disposed in the shell. The bus plate is provided with working voltage, a power supply plug-in, a CPU (central processing unit) plug-in, an alternating current sampling plug-in, a smart I/O (input/output) plug-in, a remote communication plug-in and a serial communication plug-in. The CPU plug-in is in signal connection with the alternating current sampling plug-in, the smart I/O plug-in, the remote communication plug-in and the serial communication plug-in respectively. By the distributed power supply grid connection interface device, circuit signals of secondary equipment in grid connection circuits can be processed in a centralized manner, grid connection circuit wiring can be optimized, secondary equipment intensification is facilitated, maintenance by a user is facilitated, and popularization is facilitated.

Description

technical field [0001] The invention relates to a distributed power grid-connected technology, in particular to a distributed power grid-connected interface device. Background technique [0002] Distributed power generation usually refers to small modularized, decentralized, efficient and reliable power generation units with a generating power of several kilowatts to hundreds of megawatts, arranged near users, and its core is various types of distributed power sources, mainly It refers to the power source of renewable energy such as wind energy, solar energy, water energy, natural gas, geothermal energy, ocean energy, biomass energy and so on. After a large number of distributed power sources are connected to the grid, they will have a certain impact on the grid. Therefore, it is necessary to monitor the voltage, current, active power, reactive power, and power factor of the grid-connected point, and send the relevant electrical quantity data to the local power dispatching d...

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Problems solved by technology

After a large number of distributed power sources are connected to the grid, they will have a certain impact on the grid. Therefore, it is necessary to monitor the voltage, current, active power, reactive power, and power factor of the grid-connected point, and send the relevant electrical quantity data to the local power dispatching department. The power dispatching department remotely operates the power grid circuit through the telecontrol system. Therefore, many secondary equipment (such as relay protection devices, measurement and control devices, communication management devices, telecontrol devices, and power quality monitoring devices) are required in the existing grid-connected circuits. , because there is no dedicated interface equipment for centralized processing, the secondary equipment is wired independently, the installation is difficult, the secondary circuit is cumbersome, and the investment cost of equipment is large, which is not conducive to the promotion and application of distributed photovoltaic power generation

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