Changing The Permitted Reverse Power In The Generator; Configuring The Current Limit For The Generator Depending On The Frequency; Changing The Type Of The Generator Interface - SMA SUNNY ISLAND 3.0M Installation Manual

SMA Solar Technology AG
3. Select the parameter Frequency monitoring generator lower minimum threshold / 234.05 GnFrqMin and
set to the minimum frequency of the generator voltage.
4. Select the parameter Frequency monitoring generator upper maximum threshold / 234.06 GnFrqMin and
set to the maximum frequency of the generator voltage.
8.4.1.4

Changing the Permitted Reverse Power in the Generator

If the reverse power for the set time is exceeded, all Sunny Island inverters disconnect the generator from the
stand-alone grid and block the connection of the generator to the stand-alone grid for the minimum stop time.
Generator damage
In the event of reverse power, the AC sources in the stand-alone grid drive the generator. The generator can be
damaged as a result.
• Observe the manufacturer's information on reverse power protection of the generator.
• Set the generator reverse power and permitted time for reverse power according to the manufacturer's
specifications.
Procedure:
1. Log in to the communication product as Installer (see the user manual of the communication product) or switch to
expert mode on the Sunny Remote Control (see the Sunny Island operating manual).
2. Select the parameter Voltage monitoring generator maximum reverse power / 234.13 GnRvPwr and set
to the active power of the generator reverse power.
3. Select the parameter Voltage monitoring generator maximum reverse power tripping time /
234.14 GnRvTm and set to time period of the generator reverse power.
8.4.1.5 Configuring the Current Limit for the Generator Depending on the
Frequency
The higher the generator current, the higher the torque for the generator. With unregulated generators, the
speed of rotation decreases with increasing torque. If the speed of rotation decreases, the frequency of the generator
voltage is reduced.
If the frequency of the generator voltage falls below the rated frequency, the generator management can place
additional limits on the generator current. The lower the frequency, the more the generator current is limited by the
generator management. This setting is useful if the generator is supplying other loads parallel to the Sunny Island.
This setting allows the maximum load to be placed on the generator without overloading it.
Requirement:
☐ The generator must not be an inverter generator. The output frequency of the inverter generator is fixed.
Procedure:
1. Log in to the communication product as Installer (see the user manual of the communication product) or switch to
expert mode on the Sunny Remote Control (see the Sunny Island operating manual).
2. Select the parameter Nominal generator current / 234.03 GnCurNom and set to the desired value. Tip: A
suitable value for the parameter 234.03 GnCurNom is 80% of the maximum generator current per line conductor.
3. Select the parameter Type of generator current limitation / 234.15 GnCtlMod and set to CurFrq. This will
activate the frequency-dependent current limiting.
8.4.2

Changing the Type of the Generator Interface

If you have installed a generator in the system, the type of generator interface determines how the generator
is controlled.
Installation manual SI30M-44M-60H-80H-IA-en-32
8 Commissioning
91