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System integrators for battery energy storage systems often have to network components from different industrial sectors (energy, building automation, industry, automotive) and then connect them to higher-level control systems (SCADA, cloud). This involves a wide variety of protocols and network topologies that must be intelligently coupled, while special component protection is required during networking due to the proximity of sensitive electronic assemblies and components carrying high currents. 

The typical system integrator has to deal with the following:

  • Network design, i.e. the interconnection of different components using different protocols and network standards
  • Remote access to the BESS application and connection to higher-level SCADA and smart grid systems 
  • Component protection against internal and external disturbances, e.g. AC/DC noise or lightning strike
  • Network commissioning, testing, maintenance, and data logging

HMS Networks offers proven solutions for solving all these challenges, either with intelligent gateways and repeaters or with effective test, logging, and visualisation solutions. All by one global supplier with many years of experience in the field of industrial data communication using various communication and networking standards.

Network design

The use of components from different industries – such as batteries with BMS (Battery Management System) from the automotive sector, air conditioning units from the building sector and inverters from the industrial sector – requires the interconnection of various protocols and network standards via gateways. CAN, BACnet, KNX, Modbus and other protocols can be easily linked via intelligent gateways, which allows data exchange across all levels, and centralised control.

These gateways can selectively filter, map and, if necessary, manipulate the data to realise the best possible data networking. Anybus and Intesis gateway solutions from HMS Networks enable interconnection of devices from all relevant industries, whether building automation with its corresponding network protocols (air conditioners, fire detectors) or industrial automation (controllers, inverters). They enable the connection of more than 300 different network combinations and allow customers to integrate a wide range of devices.

When it comes to CAN-based networks, which are often used in BESS applications to interconnect the BMS units (Battery Management System), the use of different topology structures can make sense, due to their application-specific advantages.

CAN uses a bus topology, in which all nodes are connected in parallel using a two-wire bus. In battery storage systems, the CAN bus must be connected to each node, but the bus topology does not allow long stub lines due to signalling reasons. This quickly leads to very long bus systems, which has a detrimental effect on baud rates.  

The use of CAN repeaters allows the use of stub lines on the CAN bus, which can drastically reduce the bus length, since it is not necessary to loop through to all nodes. Furthermore, star and tree topologies can be realised with repeaters or bridges (with additional filter and mapping features), which often leads to much more effective line routing.

With the Ixxat brand, HMS Networks has 20 years of experience in the CAN field and offers with its CAN repeaters, bridges and gateways proven and cost-effective solutions for professional CAN networking.

The networking of battery storage systems brings together a wide range of different network standards and protocols within a very small space.

The networking of battery storage systems brings together a wide range of different network standards and protocols within a very small space. Image courtesy of Azat Valeev – shutterstock.com.

Download tthe BESS network design whitepaperhe BESS network design whitepaper to get an overview of the network topologies and networking options in the BESS area and to learn more about the possibilities for easy networking of components using different protocol and network standards. 

 

Remote access

Networking of components within battery energy storage systems – with the integration of all system levels – is a prerequisite for optimal connection to cloud networks or SCADA systems. In smart grid networks, the storage and provision of energy can be controlled centrally and battery and system data is available for predictive maintenance, ensuring optimal operation of the battery energy storage systems.

Operating data, maintenance data, energy data and many other data sources are often easily accessible in a networked battery energy storage system and can be displayed using suitable visualisation tools, e.g. the webfactory i4 solution from HMS Networks. 

For smart grid and cloud connectivity, special gateways are used that support both the energy protocols, such as IEC 61850, IEC 60870-5-104 or DNP3, and the industrial fieldbus and Industrial Ethernet standards, as well as standards for connecting to cloud systems (OPC-UA, MQTT). 

At this point, special attention must be paid to data security and access protection too. These special gateways must have robust cybersecurity features, such as firewall, OpenVPN, TLS encryption and user management.

Using Ixxat SG-gateways from HMS Networks, customers can link BESS applications with the smart grid. The combination of energy, industrial and building protocols, comprehensive security functions, various interfaces (also 3G/4G/Wi-Fi) and a Web-PLC functionality in one single device allows to replace several devices by one compact and cost-effective unit.

The battery energy storage system is one of many building blocks in modern Smart Grid Systems, which must be controlled centrally and intelligently for perfect interaction. 

The battery energy storage system is one of many building blocks in modern Smart Grid Systems, which must be controlled centrally and intelligently for perfect interaction. Image courtesy of Golden Sikorka – shutterstock.com.

Component protection

High currents as well as the use of inverters, when feeding into the grid, can cause Electro Magnetic (EM) interference within the networked components. But external influences, such as lightning, can also damage the electronic components. Protective measures must therefore be provided in the design of the systems to prevent damage to components and ensure smooth data communication. 

Galvanically isolated interfaces provide a high level of protection against overvoltage damage. If components do not have a galvanically isolated interface, the integration of galvanically isolated repeaters or gateways can provide a remedy in CAN-based networks. Ixxat CAN repeaters provide a reliable galvanic protection with up to 4kV and they refresh the signal levels on the CAN line, which are affected due to EM influences, and thus ensure reliable message detection at the nodes. The use of Ixxat CAN FO (fiber optic) repeaters can even completely prevent signals from being influenced by EM interference.

This sponsored editorial is brought to you by HMS Networks. For more information, visit hms-networks.com.

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