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Sunny Island
2.2 Functional Design of the Sunny Island
The bi-directional Sunny Island consists of a Cuk DC/DC converter, an inverter and a
control and system management.
The DC/DC converter supplies the DC link circuit with an app. constant 380 V DC.
Electric energy can charge the battery and can be extracted from the battery as well.
The inverter consists of a full bridge and provides sinusoidal output voltage through a
filter. It can be operated in all four quadrants.
For control and management of the battery inverter it has a double processor con-
cept with a closed loop control processor (DSP, digital signal processor) and a man-
agement system processor. The system management processor performs overall
control, data acquisition and communication. The power unit is mainly controlled by
the DSP.
Fig. 2.1 shows the three basic components of the battery inverter.
Battery
60 V
Bat. Temp.
DieselVoltage
Diesel Current
Service
COM 3
Communi-
COM 2
cation
Three-Phase
COM 1
Operation
BWRI33-12:EE
63 A DC
Management
Fig. 2.1: Components of the battery inverter
- 13 -
Installation & Operating Instructions
=
16 A AC
Control
System
Display
Island Grid
230 V, 50/60 Hz
Relay K1
Relay K2
Relay K3
Relay K4
Relay K5
Relay K6
Relay K7
Relay K8
SMA Regelsysteme GmbH
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