User manual

User Manual Page 15 of 74
(PVI-6000-OUTD-UK-W Rev.1.0)
The block diagram shows an AURORA PVI-6000-OUTD with the two input DC-DC
converters; in the Wind version the 2 converters are always connected in parallel.
Thanks to its high efficiency and excellent thermal design, the AURORA inverter
provides maximum power operation in a broad range of ambient temperatures.
The inverter is controlled by two independent DSPs (Digital Signal Processors) and
one central microprocessor.
This way, grid connection is controlled by two independent computers in full
compliance with electrical power supply and safety regulations.
The AURORA operating system continuously communicates with all functional
blocks and processes the data to ensure optimal performance, as well as the highest
possible efficiency under all wind speed and load conditions, always in full
compliance with the applicable directives, standards and regulations.
2.4 Safety Features
2.4.1 Anti-Islanding
When the local power distribution grid fails or when it is shut down for maintenance,
the AURORA inverter shall be disconnected from the grid, to protect the people
working on the grid, and in full compliance with the applicable national standards and
regulations. To avoid any possible islanding operation, the AURORA inverter is
equipped with the automatic disconnection protective system called Anti-Islanding.
The AURORA PVI-6000-OUTD-UK-W model is equipped with a state-of-the-art
anti-islanding protection system certified to the following standards and regulations:
¾ G83/1 standard
2.4.2 Wind generator Ground Fault
A sophisticated ground protection circuit continually monitors the ground connection.
When a ground fault is detected, this circuit shuts down the AURORA inverter and
turns on the red LED on the front panel to indicate a ground fault condition. The
AURORA inverter is equipped with a terminal for the system grounding conductor;
see section 3.6 for more details.
NOTE: For more details regarding the AURORA shutdown or possible
causes of malfunction, please, refer to sections 5.3 and 5.4.
2.4.3 Additional saftey features
The AURORA inverter is equipped with additional protections to guarantee safe
operation under any circumstances. The protections include:
¾ constant monitoring of the grid voltage to ensure that voltage and frequency
remain within the specified limits