The lithium iron phosphate battery energy storage system is controlled by a programmable logic controller (PLC) and a human-machine interface (HMI). One of the key functions of the PLC system is to control the charging time and rate of the energy storage system through standardized communication inputs, control signals, and power supply, integrated with the rest of the system. It can be accessed via dial-up or the Internet. It has multiple layers of defense to restrict access to its different functions and provides customized reporting and alarm functions for remote monitoring.
◆Power conversion system
The function of the power conversion system is to charge and discharge lithium iron phosphate batteries and provide improved power quality, voltage support, and frequency control to the local power grid. It features a multi-quadrant, dynamic controller (DSP) capable of complex and rapid operations with dedicated control algorithms, enabling it to switch outputs across the entire range of the device, cyclically switching from full power absorption to full power output. It can operate normally for any combination of reactive power and active and reactive power demands.
◆Lithium iron ion battery stack
A battery stack consists of several individual cells. Lithium iron phosphate (LFP) battery energy storage systems can economically store and supply large-scale electricity on demand, primarily in stationary configurations. It is a long-life, low-maintenance, and highly efficient technology that supports stepless scaling of power and storage capacity. Energy storage systems are particularly effective for renewable energy suppliers, grid companies, and end-users.
Lithium iron phosphate (LFP) battery energy storage systems can be used at every stage of the power supply value chain, converting intermittent renewable energy sources such as wind and solar power into stable power output; optimizing power supply in remote areas; deferring grid fixed investments; and peak shaving and valley filling. Energy storage systems can also be used as backup power for substations and communication base stations. LFP battery energy storage systems are environmentally friendly, having the lowest ecological impact among all energy storage technologies, and do not use elements such as lead or cadmium as critical reactants.
◆Power supply to remote areas
In sparsely populated remote areas, such as islands, diesel generators often serve as the sole energy source. Diesel generators frequently operate at off-rated power due to load variations, which can reduce fuel efficiency by up to 30%.
As wind and solar power increasingly account for a larger share of total diesel power generation, when this proportion reaches around 30%, the resulting instability will directly reduce the reliability of the local power grid, necessitating restrictions on further renewable energy generation. However, by configuring lithium-ion battery energy storage systems, this proportion can be achieved to 100%, while shortening the project payback period to 3 years. With rising fuel prices, the economic benefits will become even more significant.
◆Communication base station
Traditional battery systems used in communication base stations are often used as backup power to ensure that there are about 5-20 short-term or momentary power failures per year. They do not need to undergo frequent deep charge and discharge cycles.
The target market for the 5kW-8-hour deep-cycle energy storage system is communication base stations in off-grid or weak grid areas, enabling these base stations to achieve recycle power supply or use hybrid systems such as wind and solar power. The lithium iron phosphate battery energy storage system significantly reduces operating costs and diesel consumption, thereby extending diesel engine life and reducing the sensitivity of communication base stations to changes in ambient temperature.
◆Peak shaving and valley filling
Lithium-ion battery energy storage systems can reduce peak energy loads at the distribution end, which encourages grid equipment to utilize and meet end-customer demand. This improves the grid load factor. The chart below illustrates how selectively releasing electricity during peak demand periods can achieve significant energy savings.
◆Smart Grid
Smart grids are an important component of future advanced power grid management systems, and lithium iron phosphate battery energy storage technology has a huge market potential in this field.
