Overview
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2 Overview
2.1 PCS for energy storage systems
The PCS is suitable for large-scale energy storage applications. A typical energy
storage system with this product generally consists of battery modules, PCS (this
product), energy management systems (EMS) and AC power distribution equipment
(Figure 2-1a /Figure 2-1b). It is used to convert DC power from battery modules to
AC with the same frequency and phase as the AC grid.
The PCS is UL 1741-SB certified to IEEE 1547-2018 standards, and offers Volt-Ride
Thru, Freq-Ride Thru, Ramp-Rate, PF, Volt-Var, Freq-Watt, Volt-Watt and other grid-
support functions.
Figure 2-1b off-grid energy storage system example
When the storage system is in off-grid mode and has unbalanced single phase loads,
an external isolation transformer is necessary. If the power grid is lost, the contactor
on the grid side must be disconnected, and the PCS supplies power to the local load.
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