Selection Of Surge Protector In Photovoltaic Energy Storage System
How to select surge protectors in photovoltaic energy storage systems? With the rapid rise of the renewable energy industry, photovoltaic energy storage systems have become a key player in energy supply. However, during operation, such systems are often disturbed by external factors such as lightning strikes, voltage fluctuations, and electromagnetic interference, which may lead to serious equipment failures and safety risks. The following are the main obstacles that affect the normal operation of photovoltaic energy storage systems:
1. Risk of lightning surge
Lightning strikes the photovoltaic array and lightning arrester, causing lightning current to invade the DC side of the inverter.
Lightning strikes the battery container and line, causing lightning current to invade the PCS (energy storage inverter) and BMS (battery management system).
LEMP (lightning electromagnetic pulse) is induced near the photovoltaic array and AC power grid, invading the DC side of the inverter and the AC side of the PCS.
2. System failure caused by surge
Causes interruption of internal system service or breakdown of components in the energy storage inverter PCS, and the protection device refuses to operate.
Causes failure of communication components of the battery cluster and the battery management system BMS, resulting in false alarms of abnormal monitoring status of the BMS.
Cause insulation breakdown electrical faults, resulting in protection device refusal to operate, short circuit arcing and fire.
In order to solve the above problems and provide lightning surge solutions for photovoltaic energy storage systems, we recommend installing suitable surge protectors in the following locations:
Photovoltaic array: Install lightning rods and grounding systems that meet industry standards to protect photovoltaic panels from direct lightning strikes.
Combiner box: Install power surge arresters in the combiner box to prevent lightning wave intrusion.
PCS (energy storage converter): Install surge protectors on the power and signal lines of the PCS to suppress lightning waves and grid disturbances.
DC distribution cabinet: Install surge protectors on the power and signal lines of the DC distribution cabinet to prevent lightning waves from intrusion.
AC distribution cabinet: Install surge protectors on the power and signal lines of the AC distribution cabinet to suppress lightning waves and grid disturbances.
Battery cluster and BMS (battery management system): Install signal surge protectors on the communication lines of the battery cluster and BMS to prevent lightning waves from intrusion and interference.
Step-up transformer: Install a lightning arrester on the step-up transformer to prevent the intrusion of lightning waves.
