Introduction:

Commercial and Industrial (C&I) energy storage systems play a crucial role in maximizing the self-consumption rate of photovoltaics,reducing electricity expenses for industrial and commercial owners,and aiding enterprises in saving energy and reducing emissions.These systems offer two main business models: self-installation or assistance from energy service companies.The latter option involves companies investing in energy storage assets and taking responsibility for operations and maintenance,while customers pay for electricity costs.Increasingly,C&I energy storage is expanding into various application scenarios,such as charging stations,data centers,5G base stations,and port shore power,showing immense potential for growth.

1.Structure of C&I Energy Storage System:

The structure of C&I energy storage systems consists of various components.The power conversion system (PCS) is built independently of the battery system.The PCS includes the inverter boost unit,grid-connected cabinets,transformers,and other necessary aspects.The battery system is contained within a container,which integrates battery cabinets,confluence cabinets,and monitoring equipment.These containers have independent power supply,lighting,temperature control,humidity control,and fire protection systems.Additionally,the power station requires a station power system to provide self-consumption power for the energy storage unit and a booster station for grid connection support.

2.Solar Panels:

Solar panels in C&I energy storage systems are designed to meet daily electricity consumption demands under average weather conditions.The annual power generation of solar cell modules must be equal to the annual electricity consumption of the load.It's important to consider factors like losses in the conversion process,controller efficiency,machine losses,and battery pack losses during charging and discharging (typically 10-15% loss).Proper design and consideration of these factors ensure efficient utilization of solar energy.

3.Battery Selection:

In C&I energy storage systems,energy-type batteries are generally preferred due to their suitability for cost-effective,long-cycle life applications.Since response time is relatively less crucial,energy-type batteries are considered for their cost-effectiveness.The battery's task is to ensure uninterrupted power consumption during periods of insufficient solar radiation.The capacity of the battery pack is designed according to the specific requirements of the system,while considering off-grid operation and backup power provisions for rainy days.

4.Power Conversion System (PCS):

The PCS used in commercial and industrial energy storage inverters is relatively compact and based on two-way conversion.It offers flexibility for battery system integration and expansion according to users' needs.The wide voltage range of 150-750V enables compatibility with various battery types such as lead-acid,lithium,and LEP batteries.Besides its basic functions,the PCS must provide grid support,including primary frequency regulation and fast dispatch of source,grid,and load.Its adaptability allows for efficient power response and management.

5.Energy Management System (EMS):

For most commercial and industrial energy storage systems,the EMS does not need to accept grid dispatching.Its functions primarily revolve around local energy management and support for battery balance and safety.The EMS ensures millisecond-level fast response,integrated management,and centralized control of energy storage subsystem equipment.Its basic yet efficient features enable seamless operation and can be customized based on specific energy management needs.

Conclusion:

The commercial and industrial energy storage market is poised for substantial growth from 2023 to 2024,with its potential to become a standard configuration in industrial production and large commercial districts.ACDC,a leader in energy battery solutions,is actively developing and providing industrial and commercial energy storage batteries.These batteries offer modular and expandable storage systems,all-in-one AC-coupled solutions,customized energy content,maximum battery cell life,and outdoor housing suitable for any installation site.ACDC's broad portfolio of energy storage solutions can be tailored to operational needs,ensuring efficient and cost-effective storage for optimum energy distribution and utilization.With expert support and specialized tools,ACDC enables the optimization of project economics and cultivates investment-grade business cases to propel the growth of commercial and industrial energy storage.

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Reference website:https://www.pv-magazine.com