Bess system diagram Bosnia and Herzegovina

What is a Bess system?

In each BESS there is a specific power electronic level, called PCS (power conversion system) usually grouped in a conversion unit, including all the auxiliary services needed for the proper monitoring. The next level is for monitoring and control of the system and of the energy flow (energy management system).

What are the different levels of a Bess?

A BESS is composed of different “levels” both logical and physical. Each specific physical component requires a dedicated control system. Below is a summary of these main levels:

Should a Bess be split into two or more distinct units?

It may be decided to split the BESS into two or more distinct units for connection at multiple points in the network. This can be done to allow multiple sections to function independently with BESS support, as well as provide redundancy in system design. The type of connection should be decided early.

What type of connection should a Bess use?

The type of connection should be decided early. If the BESS shall connect to a LV or MV connection point. Most battery systems will not exceed 1500 V DC, as this would bring them into the HV classification range and entail increased equipment and operational demands.

Can a Bess connect to a LV or MV connection point?

If the BESS shall connect to a LV or MV connection point. Most battery systems will not exceed 1500 V DC, as this would bring them into the HV classification range and entail increased equipment and operational demands. Additionally, it may be difficult to find DC switchgear rated to such high voltages and current.

How do I choose a Bess transformer?

Consider the voltage regulation of the transformer during full load charging and discharging of the BESS. Option to select a more optimised voltage ratio between grid and BESS AC output. This may allow for lower DC link operating voltages than a direct connection.