As an important form of large-scale energy storage, battery energy storage systems play a variety of roles in the power system, including:
Photovoltaic self-use application scenarios
When the electricity generated by the photovoltaic system is sufficient, the priority is to supply power to the load, the excess electricity is charged to the battery, and the remaining electricity is sold to the grid. When the power generated by the photovoltaic system is insufficient or the photovoltaic system does not generate power, the battery power is preferentially used to supply power to the load, such as the battery power is insufficient, then the power grid supplies power to the load. When the photovoltaic system and the battery are unable to supply power, the power grid supplies power to the load.
Application scenarios of microgrids
The photovoltaic energy is preferentially stored in the battery, and the remaining power supplies the load. When the photovoltaic energy is insufficient, the energy storage battery supplies the load first, and then the diesel generator supplies the load when the energy is insufficient.
Backup power supply application scenario
When the mains power is off, it automatically switches to the off-grid load mode to ensure that the load does not lose power, and supports off-grid black start to ensure emergency load power supply.
Compared with traditional power supply methods, large-scale energy storage power stations can quickly adapt to load changes, which plays an important role in improving the safe and stable operation level of the power system, and the quality and reliability of the grid power supply. In addition, they can optimize the power structure, achieve green environmental protection, promote energy conservation and emission reduction of the power system, and improve the overall economic benefits.
Modular Design:
The modular design allows the system to scale according to demand, and modules can be easily added or upgraded to suit different application scenarios and power requirements without requiring large-scale changes to the entire system architecture. The modular design allows individual components to be replaced and maintained independently, reducing maintenance costs and complexity. When a module needs to be maintained or upgraded, the normal running of other modules is not affected. The modular design allows the system to continue to operate if some modules fail, as other modules can take over their functions, thus improving the overall system's availability and resilience.
Two-level topology
The two-stage topology allows for a more flexible battery pack configuration, as the battery pack can be controlled independently of the AC grid via a DC/DC converter. The two-stage topology allows each level of converter to operate at the optimal operating point, thereby increasing overall efficiency. The DC/DC converter can adjust the battery voltage appropriately, while the PWM converter is responsible for inverting the adjusted voltage to AC, which can reduce energy loss and improve energy conversion efficiency. This structure allows PCS to adapt to a wider range of battery voltages, meaning that PCS can be compatible with different types and configurations of battery systems, increasing the flexibility and applicability of the system.
Support grid-connected and off-grid operation, and with STS can realize automatic seamless switching between grid-connected and off-grid states to ensure the continuity of load power supply.
Support photovoltaic panel access, with photovoltaic maximum power tracking function.
