SPECIAL CHARACTERISTICS AFFECTING THE SELECTION
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3
Figure 14. The need of a balance charger
A balance charger is basically the same as a bulk power device (grid converter or DC/DC converter)
but with a smaller rating to be able to reach a control accuracy of storage current of 0.01C.
3.4
System control principles
The energy storage systems are often incorporated with different layers of controls having different
responsibilities.
The Energy Management System optimizes the energy efficiency of the system. This can include
choosing and prioritization the usage of different energy sources. Normal time scales are from tens
of seconds to hours.
The Power Management System includes controlling of power balance in a system that has multiple
energy/power sources. Normal time scales are from grid cycle (20ms - 50Hz) to seconds.
The Power Conversion System of this list is the system relevant to the product. The PCS includes
Power Conversion Control and Power Conversion Hardware, which is the VACON® hardware. It is
to control power conversion between the energy storage and the system. Normal time scales are
from micro seconds to grid cycles.
The Storage System includes Battery Management System and the battery. Battery Management
System monitors the storage system as well as the storage cell level phenomena.
#
Reference
#
Reference
A
Not possible to reach 100%
SOC with big current =
Balance charger?
B
Not safe to go empty SOC
with big current. BMS to tell
when stop discharging.
A
B
120
100
80
0
20
40
60
80
100
UDC [%]
SOC [%]
Charging of battery
Discharging of battery
1C
2C
3C
6C
9C
Summary of Contents for NX6
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