Integrated Grid - connected Photovoltaic Distribution Cabinet

Integrated Grid - connected Photovoltaic Distribution Cabinet. It is a key device in the photovoltaic power generation system. 

The following will introduce it to

 you from aspects such as functions, composition, working principle, and application scenarios:

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## Definition and Functions

- **Definition**: The integrated grid - connected photovoltaic distribution cabinet is an electrical device that processes

 the direct current generated by the

 photovoltaic power generation system and connects and interacts with the power grid. It integrates multiple

 functions and realizes an efficient, safe, and 

stable connection between the photovoltaic power generation system and the power grid.

- **Functions**

- **Power Conversion and Control**: Convert the direct current generated by the photovoltaic panels into alternating

 current with the same frequency and 

phase as the power grid, and precisely control parameters such as the voltage, frequency, and phase of the electrical

 energy to ensure it meets the grid connection

 requirements.

- **Power Distribution and Metering**: Distribute the converted alternating current, transmit the electrical energy

 to different loads or power grid branches, 

and accurately measure the amount of electrical energy used for energy management and billing.

- **Protection and Monitoring**: It has multiple protection functions such as over - current protection, over - voltage

 protection, under - voltage protection, 

and leakage protection. When abnormal situations occur in the system, it can quickly cut off the circuit to protect 

the safety of equipment and personnel. 

At the same time, it monitors the operating parameters of the system in real - time, such as voltage, current, power,

 temperature, etc., to detect faults in a 

timely manner and carry out maintenance.

### Basic Composition

- **Photovoltaic Inverter**: It is the core component of the integrated grid - connected photovoltaic distribution 

cabinet. Its main function is to convert 

the direct current generated by the photovoltaic panels into alternating current.

- **Grid - connection Switch**: It is used to control the connection and disconnection between the photovoltaic 

power generation system and the

 power grid. Usually, a circuit breaker or contactor with a high breaking capacity is adopted, which can quickly 

cut off the circuit when a fault occurs 

in the system to protect the safety of the equipment and the power grid.

- **Metering Device**: It is used to measure the power generation and grid - fed power of the photovoltaic 

power generation system. Generally,

 a high - precision electricity meter is used, which can accurately record the electricity consumption situation and 

provide data support for electricity

 bill settlement and energy management.

- **Protection Device**: It includes multiple protection functions such as over - current protection, over - voltage 

protection, under - voltage protection

, and leakage protection. When abnormal situations occur in the system, the protection device will act quickly to

 cut off the circuit and prevent equipment

 damage and the expansion of accidents.

- **Monitoring System**: It monitors the operating parameters of the photovoltaic power generation system in real

 - time, such as voltage, current, 

power, temperature, etc., and uploads the data to the monitoring center or remote terminal through the communication

 interface, which is convenient

 for users to remotely monitor and manage the system.

### Working Principle

The photovoltaic panels generate direct current under illumination conditions. This direct current is first input into the

 photovoltaic inverter. Inside 

the photovoltaic inverter, through the switching actions of power semiconductor devices, the direct current is converted

 into alternating current, 

and its parameters such as voltage, frequency, and phase are adjusted to match the electrical parameters of the power 

grid. The alternating current 

converted by the inverter is connected to the power grid through the grid - connection switch. In this process, the

 metering device will measure the

 power generation and grid - fed power in real - time, the protection device will continuously monitor parameters 

such as current and voltage in the 

circuit, and cut off the circuit in a timely manner when abnormal situations occur. The monitoring system will collect

 and transmit the operating data 

of the system in real - time for users to monitor and manage.

### Application Scenarios

- **Distributed Photovoltaic Power Generation Projects**: Such as rooftop photovoltaic power generation systems

 on industrial plants, commercial

 buildings, residential houses, etc. The integrated grid - connected photovoltaic distribution cabinet can efficiently

 integrate the electrical energy 

generated by the distributed photovoltaic power generation system into the power grid, realize the feeding of

 surplus power to the grid, and bring 

additional income to users.

- **Centralized Photovoltaic Power Plants**: In large - scale centralized photovoltaic power plants, the integrated grid

 - connected photovoltaic 

distribution cabinet is a key device to realize the connection between the photovoltaic power generation system

 and the power grid. It can centrally

 convert, distribute, and control the electrical energy generated by a large number of photovoltaic panels, ensuring 

the stable transmission and 

efficient utilization of electrical energy.

- **Smart Micro - grids**: In smart micro - grids, the integrated grid - connected photovoltaic distribution cabinet 

can not only realize the

 connection between the photovoltaic power generation system and the power grid, but also operate in coordination

 with other distributed

 energy sources (such as wind power, energy storage systems, etc.), realize the optimal allocation and flexible dispatch

 of energy, and improve the

 stability and reliability of the micro - grid.