Grid-connected cabinet is an electrical device used to connect, control, and protect the power generation system and the power grid, widely applied in photovoltaic power generation, energy storage, and other fields. The following is a detailed introduction:

Definition and Function

The grid-connected cabinet is a distribution device connecting the power generation system and the power grid, mainly used at the grid connection points of photovoltaic power generation systems, energy storage power generation systems, etc. It has functions of power conversion, distribution, and control, and can also be equipped with metering, protection, and other functional components to protect and measure total power generation, facilitate fault maintenance management, and improve the safety and economic efficiency of the power generation system.

Structural Composition

Mainly composed of DC input terminal, inverter, AC output terminal, protection devices, and monitoring system. The DC input terminal receives DC power output from photovoltaic battery arrays or energy storage devices; the inverter converts DC power into AC power synchronized with the grid frequency and phase; the AC output terminal injects the converted AC power into the grid; protection devices provide overvoltage, undervoltage, overcurrent, islanding, and other protections; the monitoring system can monitor the operating status of the grid-connected cabinet in real time.

Working Principle

Taking the photovoltaic power generation system as an example, the DC power output from the photovoltaic battery array enters the grid-connected cabinet through the DC input terminal, is converted into AC power by the inverter, synchronized with the power system frequency and phase, and then injected into the power system through the AC output terminal, completing the grid connection process. Meanwhile, the monitoring system performs real-time monitoring and management of the grid-connected cabinet's operating status to ensure safe and stable system operation.

Main Technical Features

Wide capacity range: can cover different power demands, such as some grid-connected cabinets meeting user grid connection needs below 2000A.

Multiple functions: equipped with functions such as voltage closing detection, undervoltage trip, overcurrent protection, overvoltage protection, islanding protection, anti-reverse flow protection, and some also have RS485 communication interfaces for remote monitoring and data transmission.

Easy installation: lightweight, compact structure, customizable design according to actual needs, adaptable to different installation environments.

Application Scenarios

Photovoltaic power generation field: widely used in large photovoltaic power plants, distributed photovoltaic power generation, household photovoltaic grid connection points, etc., to achieve connection and power transmission between photovoltaic power generation systems and the grid.

Energy storage power generation field: used at grid connection points of energy storage power generation systems in industrial and commercial sectors, connecting energy storage power generation systems and the grid, used together with energy storage grid-connected inverters to form a complete energy storage power generation system solution.

Other fields: in the industrial field, it can seamlessly switch and operate the factory's self-owned power generation equipment with the utility power; in the commercial field, it can achieve centralized management and control of multiple power consumption areas; in residential communities, it can integrate distributed energy within the community into the grid, providing reliable power supply for public facilities.