The main function of the photovoltaic grid connection cabinet.

Release time:

2023-04-10

Author:

Source:

Abstract

During operation, the photovoltaic grid-connected cabinet may experience fluctuations in grid-side voltage, frequency, and other aspects, which can impact the station, leading to phenomena such as excessive load. This not only poses a risk of damage to grid equipment but also threatens the safety of maintenance personnel. The issue of harmonics is a major problem in photovoltaic power generation. Photovoltaic power generation uses AC and DC inverters, and since inverters operate through the switching on and off of semiconductor power switches.

Chengyuan Electric producesphotovoltaic grid-connected cabinetsmainly composed of knife switches, circuit breakers, and related control components. Due to its connection between the generator system and the grid system, it is equipped with complete grid protection devices, serving the function of connecting the generator to the grid, hence called a 'grid-connected cabinet'. The photovoltaic grid-connected cabinet exists as the main export of photovoltaic power stations within the photovoltaic system. It is a distribution device that connects photovoltaic power stations to the grid, capable of protecting and measuring the total amount of photovoltaic power generation, facilitating fault maintenance management, and improving the safety and economic benefits of the power generation system. It has multiple protection functions such as loss of pressure tripping, presence of pressure closing, overcurrent protection, overvoltage protection, islanding protection, anti-backflow protection, harmonic treatment, and reactive power compensation. It also displays operating parameters and status indicators of the photovoltaic power generation system and is widely used in photovoltaic power generation systems. When used in conjunction with photovoltaic grid-connected inverters, it can form a complete photovoltaic power generation system solution.


photovoltaic grid-connected cabinetsThe main function

During operation, the photovoltaic grid-connected cabinet may experience fluctuations in grid-side voltage and frequency that impact the station, as well as excessive load phenomena. This not only can damage grid equipment but also poses a threat to the safety of maintenance personnel. The harmonic issue is a major problem in photovoltaic power generation. Photovoltaic power generation uses AC and DC inverters; since inverters convert DC to AC through the opening and closing actions of semiconductor power switches, harmonic issues arise during this process. Additionally, due to the uncertainty of photovoltaic projects, random fluctuations in output power can lead to deviations in grid frequency, voltage fluctuations, and flicker. To address these situations, by installing islanding protection devices to collect signals such as grid voltage, frequency, and incoming line current from the grid, when an islanding phenomenon occurs, it quickly disconnects from the grid connection point to separate the station from the grid side rapidly. At the same time, an online monitoring device for power quality is configured to monitor voltage harmonics, voltage fluctuations and flicker, frequency deviations, voltage imbalance, voltage sags/surges/short interruptions in real-time. The use of these two devices in the photovoltaic grid-connected cabinet ensures reliable operation of the grid.


Installation precautions for photovoltaic distribution boxes and cabinets

• Installation should be carried out under the guidance of qualified technical personnel.

• Please note that it is best to cut off power before installing and operating junction boxes.

• It is necessary to conduct risk control checks, such as securing cables that may have loosened during transport. At the same time, press down on lightning protection fuses to ensure they are in the correct position.

• Although lightning protection fuses will disconnect under full load conditions, it is recommended that you replace them after cutting off the circuit to avoid any risk of burning through conductive terminals.

 

All articles, images, and other materials we repost are copyrighted by their respective owners. Since non-original articles and images cannot be contacted one by one with copyright holders, if original authors or editors believe that their works should not be available online for public viewing or should not be used without compensation, please notify us promptly so that we can take appropriate measures quickly to avoid unnecessary economic losses for both parties.

Key words:

Previous:

The purpose and characteristics of GGD type AC low voltage distribution cabinets.

Next:

What are the common types of low-voltage distribution cabinets?

Recommended Reading

Chengyuan Electric and Siemens join forces to create a better future!

On October 23, 2024, at 2:00 PM, Chengyuan Electric successfully held a project communication and technical sharing meeting with Siemens in the first-floor exhibition hall of the factory. The purpose of this meeting was to strengthen cooperation and communication between both parties, promote innovation, and jointly advance the development of the smart electrical field.

2024-10-29

How to choose suitable box-type substations and cable branch boxes

In the power system, box substations and cable branch boxes play a crucial role and are widely used in various settings, such as industrial parks, residential areas, and commercial buildings. However, faced with a variety of models and specifications available in the market, how can one choose the box substation and cable branch box that best meet their needs?

2023-12-25

The role of cable junction boxes in automated control systems.

The cable branching box is one of the indispensable components in an automation control system, playing an important role in the system by enabling the branching and connection of cables, ensuring the normal operation of the entire system. This article introduces the function of the cable branching box and its significance in automation control systems.

2023-12-15

%E7%AC%AC%E4%B8%80%EF%BC%8C%E6%9C%80%EF%BC%8C%E4%BC%98%E7%A7%80%EF%BC%8C%E5%A2%9E%E5%BC%BA%EF%BC%8C%E4%B8%80%E6%B5%81%EF%BC%8C%E5%8D%93%E8%B6%8A%EF%BC%8C%E9%A2%86%E5%85%88%EF%BC%8C%E5%85%88%E8%BF%9B%EF%BC%8C%E5%BC%95%E9%A2%86

Sorry，当前栏目暂无内容!

您可以查看其他栏目或返回 首页

Sorry，The current column has no content!

You can view other columns or return Home