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24 Guidelines for planning the electrical installation
Selecting the energy storage
WARNING!
ABB is not responsible for the energy storage selection or protection of the energy
storage.
The energy storage does not belong to the drive delivery. The customer (or the system
integrator) must acquire a suitable energy storage system. Additional guidelines:
• If the DC feeder unit has parallel strings, connect each string to a separate energy storage.
• Dimension the energy storage so that it withstands the required current cycles and the
stored energy is sufficient. Take the depth of discharge into account in energy storage
lifetime calculations.
• The output voltage (energy storage voltage) is not allowed to exceed the drive DC bus
voltage. Add sufficient voltage margin in the design to prevent this in case of voltage dips
or grid faults.
• The recommended energy storage operating voltage is:
U
= 150 V ... 80% of U
storage
• Typical DC voltage values:
• with diode supply units:
U
= 1.35 × U
DC
• with IGBT supply units:
U
= 1.41 × U
DC
• where
U
= Drive DC voltage (in the DC bus)
DC
U
= Drive input voltage (AC)
AC
• ABB recommends to measure the energy storage voltage. If the energy storage is a
super capacitor, voltage measurement is obligatory unless the capacitor withstands the
maximum DC voltage of the drive or contains internal overvoltage protection.
• Equip the energy storage with a circuit breaker capable of opening the circuit if there is
a failure in the energy storage or cable. See
the energy storage
Implementing protections for the energy storage
General principles
￭
The requirements for the customer-defined protections at the energy storage end:
• disconnecting device between the drive and energy storage system (for example, isolation
disconnector switch, withdrawable circuit breaker)
• overload and short circuit protection for the cabling (for example, circuit breaker with
thermal or electromagnetic trip unit)
• overload and short circuit protection for the energy storage elements itself (for example,
integrated overload protection in batteries).
DC
AC
(can be changed with supply unit parameter group 123 DC volt ref.
AC
and
Energy storage disconnecting
Selecting the protective circuit breaker of
device.
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