The main functions of a BMS control system, used by the final consumer of a microgrid

Monitoring the use of resources is the area in which the SIS presents the most valuable results and in which the whole system helps the consumer to make the smartest decisions regarding the use of resources in relation to their price, availability and statistically expected evolution.

We identify the best technical solution, suitable for each application and analyze the funding sources

The Smart Microgrid Controller project (project ID 2020/505837), carried out through the Norwegian funding program 2014 – 2021 under Green Industry Innovation, includes photovoltaic panels with an installed capacity of 120 kWp, two storage systems of different capacities and manufacturer (40 kWh and 56.3 kWh), the inverter that allows switching between different elements and a 120 kVA gas generator.

The microgrid developed by SIS through the project serves the Monsson office building, an inherently large energy-consuming building, even when the occupancy rate is low. A BMS will provide the necessary information and even propose the best solution for a certain situation.

Automatizare wireless vs bus

The Wireless control system is a unique solution for electrical installations in a house or apartment under renovation or reconstruction. The most common and well-known wireless networking technology for mobile systems is the IEEE 802.11 family of standards, which was introduced in 1997. It uses different frequency bands, for example, the 2.4 GHz band is used by IEEE 802.11b and IEEE 802.11. g, while the IEEE 802.11a protocol uses the 5 GHz frequency band.

The criteria by which these standards are evaluated are:

Criterion \ ProtocolWi-FiZ-WaveZigbeeBluetooth
Frequency2.4 GHz868.42 MHz Europa/908.42 MHz USA2.4 GHz2.4 GHz
Network typeAccess PointsMeshMeshStar
Range46m indoor și 92m outdoor3010100
Number of connected devices2502326500032000
Transmission speed100 Mbs9.6-100 kbps40-250 kbps1 Mbs

The essential common feature of Z-Wave, ZigBee and Bluetooth Low Energy (BLE) is that they all use an intermediate interface (hub), to which the devices (sensors, switches, etc.) connect to communicate with each other and to be able to be accessed by the user. All these interfaces (hubs) must be connected to a regular internet router so that they can be accessed by users from locations other than the local one, where the interface is installed, but data security is an issue for an office with many essential consumers, such as traders or energy dispatchers.

SIS analyzed the solution in which to implement BMS in the building that represents the final consumer of the microgrid.

The analysis indicated that for the proposed application will be used data communication via modbus and redundancy given by GSM communication. MODBUS allows you to connect a device with multiple slave devices. There are two versions: one for serial interface (RS-232 and RS-485) and one for ETHERNET. The following data transmission modes are distinguished: MODBUS TCP: ETHERNET TCP / IP communication based on client-server model; MODBUS RTU and MODBUS ASCII.

In the next stage, the additional functions will be analyzed, the functionality and the control strategy of a BMS will be described.

Ask a technical expert at SIS to evaluate the performance of a microgrid free of charge or to establish a control logic of the management system for any type of building.

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