Welcome to HZNRKJ!

Technical Encyclopedia

Switch

The role of photovoltaic anti-islet devices

          The State Grid has more specific regulations for distributed photovoltaic power plants, which are based on the installed capacity of the photovoltaic power and the transformer's own capacity, and installation of anti-islet devices . If no anti-islet is installed, the capacity of the connected PV can only be up to 25% of the transformer. If anti-islet equipment is installed, it can increase to 80% of the transformer. From this perspective, installing anti-islet devices is very important for distributed photovoltaic power plants and plays a very important role.

 
          First of all, the anti-islet device is in the form of a cabinet, which is different from anti-islet devices. Anti-island protection devices are generally installed in the grid-connected cabinets. When an abnormality occurs in the grid, the grid-connected switches are tripped. Therefore, there are active anti-islet and passive anti-islet in the concept of anti-islet. The anti-islet device is a power distribution cabinet. The core components inside are disturbance resistors, control components, anti-islet switches, etc. Its main function is to activate the anti-islet device if the 400V busbar still has power when the power grid loses power. The 400V bus voltage is disturbed by throwing in anti-islands, forcing the inverter to stop. Ensure the safety of maintenance personnel. The typical design specifications of the State Grid are shown in the figure below:
 
Photovoltaic anti-islet device system map
                                                                                   Photovoltaic anti-islet device system map
Photovoltaic island protection device
Photovoltaic island protection device
 
          In general, the JP cabinets used by the State Grid are all three-way feeders. In this case, anti-islet devices are required to be equipped with three sets of switches for use. Generally used for low voltage 400V voltage level. If the voltage level is 10KV or higher, anti-islet protection should be used. Today, centralized photovoltaic power stations are gradually decreasing. Roof-type photovoltaic power stations are gradually increasing. Moreover, for most poverty alleviation projects, the installation capacity is relatively small and the installation is relatively dispersed, and most of them are used for public change. As a result, the immediate power grid has lost power. The inverter may also be in a state of power generation. This kind of isolated network operation is not allowed to exist. Therefore, if there is such a phenomenon in the power grid before the maintenance, the anti-islet will be immediately put into operation.
 

 

Online Service

jibaonanrui

209585994

209585994

SHARE