Modularity in energy storage allows for incremental capacity additions and simplified maintenance. A modular range-extended energy storage system combines the scalability of modular design with the extended discharge capability of range extension. This configuration is suitable for applications where load profiles change over time or where future capacity expansion is anticipated.
INJET HanCang has developed modular architectures that allow users to start with a base system and add battery modules or supplementary source modules as demand increases. This article discusses the design principles, interconnection methods, and operational characteristics of modular range-extended systems.
1. Module Types and Functional Roles
A modular range-extended system consists of several distinct module types. Battery modules contain the electrochemical cells, thermal management, and local monitoring. Power modules contain the DC-AC inverters and DC-DC converters. Supplementary modules contain the generator set or fuel cell assembly. Control modules house the energy management system and communication interfaces.
Each module type is designed with standardized physical interfaces and communication protocols. This standardization allows modules from different production batches to be mixed within the same system. INJET HanCang's module design includes a mechanical locking mechanism and a plug-in electrical connector, reducing installation time and the potential for wiring errors. The functional role of each module is defined by its firmware, which is loaded during system commissioning.
2. Parallel Connection and Synchronization
Battery modules in a modular system are connected in parallel at the DC bus. Parallel connection requires that modules have similar voltage characteristics or that the system includes DC-DC converters to match voltages.
INJET HanCang uses a master-slave control architecture for parallel operation. One module acts as the master, managing the overall system state and communicating with the grid. Slave modules follow the master's commands for charge and discharge. This architecture ensures that current sharing between modules remains balanced. The modular design also allows for hot-swapping of modules, where a faulty module can be replaced without shutting down the entire system, reducing downtime.
Scaling the range-extension capability involves adding supplementary source modules or increasing the capacity of the battery modules. The choice depends on whether the application requires longer duration or more power capacity.
If the load increases, adding battery modules increases the total stored energy and the peak power capability. If the required discharge duration increases, adding supplementary source modules provides additional energy input during extended events. INJET HanCang's modular systems allow for independent scaling of power and energy, providing flexibility that fixed-capacity systems do not offer. The control system automatically reconfigures its operational parameters when a new module is added, adapting the charge and discharge schedules.
A modular system provides inherent redundancy. If one module fails, the remaining modules continue to operate, albeit at reduced capacity. This attribute is beneficial for critical loads where system availability is a primary design constraint.
INJET HanCang's modular systems are designed with N+1 redundancy in mind, where one additional module is included beyond the minimum required for operation. The control system continuously monitors each module's health. Upon detection of a fault, the system isolates the affected module and adjusts the output of the remaining modules. This fault-tolerant design increases the overall system reliability compared to a single-unit system.
Modular systems offer logistical advantages. Individual modules are smaller and lighter than a complete system, simplifying transportation and site handling. Modules can be shipped using standard freight methods without requiring specialized heavy-lift equipment.
The installation process involves positioning the modules on a prepared foundation, making the electrical and communication connections, and commissioning the system. INJET HanCang provides detailed installation procedures for each module type, ensuring that the system is assembled correctly. The reduced installation complexity lowers the project's overall cost and schedule.
The software layer in a modular system must recognize the system's physical configuration. The energy management system automatically detects the type and capacity of each module connected to the bus.
INJET HanCang's configuration software generates a system map that shows the available battery capacity, supplementary source capacity, and power conversion capability. The operator can then set the operating parameters, such as the discharge threshold and the generator start point. The software also handles load distribution, ensuring that each module operates within its rated limits. This automated configuration reduces the risk of programming errors.
Modular range-extended energy storage systems provide a flexible and scalable solution for growing energy needs. The ability to add modules incrementally, coupled with the range-extension capability, makes these systems suitable for a wide variety of commercial and industrial applications. INJET HanCang's modular designs emphasize standardization and ease of integration.