Principle and Composition of Photovoltaic Storage and Charging System
The optical storage and charging system is mainly composed of PV battery modules, PV carport, grid-connected inverter, energy storage converter (PCS), energy storage battery, charging pile equipment and billing system, AC grid-connected cabinet and comprehensive monitoring system. The 380V low voltage grid connection is adopted.
The system components are described as follows:
made of crystalline silicon, its role is to convert solar radiation energy into electrical energy, with a certain degree of rain, hail, wind and other capabilities. According to the actual needs of the battery components can be connected in series with each other, parallel connection.
The power conversion device that converts the DC current from the solar cell array into AC current that meets the requirements of the national power grid.
used to store electricity. This project adopts the lithium iron phosphate battery program with good safety.
- Energy storage converter (PCS):
it can control the charging and discharging process of the battery, and carry out AC and DC conversion. the PCS controller receives the backstage control instructions through communication, and controls the converter to charge or discharge the battery according to the symbol and size of the power instruction. the PCS controller communicates with the BMS through the CAN interface to get the status information of the battery pack, and it can realize the protective charging and discharging of the battery to ensure the safe operation of the battery. operation safety.
AC Distribution Cabinet is mainly used to provide grid connection interface for inverter/ESC through power distribution, which contains grid-side circuit breaker, lightning protector, configuration of power generation meter, grid connection interface for inverter/ESC, and AC voltage and ammeter and other devices.
the charging pile is equivalent to the electrical load in the system, which can be matched according to the actual demand of the project.
- Comprehensive monitoring system:
PV inverters and energy storage systems are equipped with data acquisition modules, which can upload power generation information and operation status in real time to the management system of the Guerawatt cloud platform, through which all PV and energy storage equipment data can be centrally managed.
