Energy Control
Grid-tied Point Control
Function
Limits or reduces the output power of the PV power system to ensure that the output power is within the power deviation limit.
Procedure
- On the home screen, choose Power adjustment > Grid-tied point control.Figure 7-11 Grid-tied point controlTable 7-1 Grid-tied point control
Parameter Name
Description
Active power
Unlimited
-
If this parameter is set to Unlimited, the output power of the SUN2000 is not limited and the SUN2000 can connect to the power grid at the rated power.
Grid connection with zero power
Closed-loop controller
- If multiple SUN2000s are cascaded, set this parameter to SDongle/SmartLogger.
- If there is only one SUN2000, set this parameter to Inverter.
Limitation mode
Total power indicates export limitation of the total power at the grid-tied point.
Power adjustment period
Specifies the shortest interval for a single anti-backfeeding adjustment.
Power control hysteresis
Specifies the dead zone for adjusting the SUN2000 output power. If the power fluctuation is within the power control hysteresis, the power is not adjusted.
Active power output limit for fail-safe
Specifies the derating value of the SUN2000 active power by percentage. If the Smart Dongle does not detect any meter data or the communication between the Smart Dongle and the SUN2000 is disconnected, the Smart Dongle delivers the derating value of the SUN2000 active power by percentage.
Communication disconnection fail-safe
In the SUN2000 anti-backfeeding scenario, if this parameter is set to Enable, the SUN2000 will derate according to the active power derating percentage when the communication between the SUN2000 and the Smart Dongle is disconnected for a period longer than Communication disconnection detection time.
Communication disconnection detection time
Specifies the time for determining the communication disconnection between the SUN2000 and the Dongle.
This parameter is displayed when Communication disconnection fail-safe is set to Enable.
Grid connection with limited power (kW)
Closed-loop controller
- If multiple SUN2000s are cascaded, set this parameter to SDongle/SmartLogger.
- If there is only one SUN2000, set this parameter to Inverter.
Limitation mode
Total power indicates export limitation of the total power at the grid-tied point.
Maximum grid feed-in power
Specifies the maximum active power transmitted from the grid-tied point to the power grid.
Power adjustment period
Specifies the shortest interval for a single anti-backfeeding adjustment.
Power control hysteresis
Specifies the dead zone for adjusting the SUN2000 output power. If the power fluctuation is within the power control hysteresis, the power is not adjusted.
Active power output limit for fail-safe
Specifies the derating value of the SUN2000 active power by percentage. If the Smart Dongle does not detect any meter data or the communication between the Smart Dongle and the SUN2000 is disconnected, the Smart Dongle delivers the derating value of the SUN2000 active power by percentage.
Communication disconnection fail-safe
In the SUN2000 anti-backfeeding scenario, if this parameter is set to Enable, the SUN2000 will derate according to the active power derating percentage when the communication between the SUN2000 and the Smart Dongle is disconnected for a period longer than Communication disconnection detection time.
Communication disconnection detection time
Specifies the time for determining the communication disconnection between the SUN2000 and the Dongle.
This parameter is displayed when Communication disconnection fail-safe is set to Enable.
Grid connection with limited power (%)
Closed-loop controller
- If multiple SUN2000s are cascaded, set this parameter to SDongle/SmartLogger.
- If there is only one SUN2000, set this parameter to Inverter.
Limitation mode
Total power indicates export limitation of the total power at the grid-tied point.
PV plant capacity
Specifies the total maximum active power in the SUN2000 cascading scenario.
Maximum grid feed-in power
Specifies the percentage of the maximum active power of the grid-tied point to the PV plant capacity.
Power adjustment period
Specifies the shortest interval for a single anti-backfeeding adjustment.
Power control hysteresis
Specifies the dead zone for adjusting the SUN2000 output power. If the power fluctuation is within the power control hysteresis, the power is not adjusted.
Active power output limit for fail-safe
Specifies the derating value of the SUN2000 active power by percentage. If the Smart Dongle does not detect any meter data or the communication between the Smart Dongle and the SUN2000 is disconnected, the Smart Dongle delivers the derating value of the SUN2000 active power by percentage.
Communication disconnection fail-safe
In the SUN2000 anti-backfeeding scenario, if this parameter is set to Enable, the SUN2000 will derate according to the active power derating percentage when the communication between the SUN2000 and the Smart Dongle is disconnected for a period longer than Communication disconnection detection time.
Communication disconnection detection time
Specifies the time for determining the communication disconnection between the SUN2000 and the Dongle.
This parameter is displayed when Communication disconnection fail-safe is set to Enable.
Shutdown at high feed-in powera
Shutdown at high feed-in power
- The default value is Disable.
- If this parameter is set to Enable, the inverter shuts down for protection when the grid-connection point power exceeds the threshold and remains in this condition for the specified time threshold.
Upper feed-in power threshold for inverter shutdown (kW)
- The default value is 0. This parameter specifies the power threshold of the grid-connection point for triggering inverter shutdown.
High feed-in power duration threshold for triggering inverter shutdown (s)
The default value is 20. This parameter specifies the duration threshold of high feed-in power for triggering inverter shutdown.
- When High feed-in power duration threshold for triggering inverter shutdown is set to 5, Shutdown at high feed-in power takes precedence.
- When High feed-in power duration threshold for triggering inverter shutdown is set to 20, Grid connection with limited power takes precedence (when Active power control is set to Grid connection with limited power).
Note a: This parameter is supported only for the AS4777 grid code.
Apparent Power Control on the Inverter Output Side
On the home screen, tap Settings > Power adjustment to set inverter parameters.
Parameter |
Description |
Value Range |
|---|---|---|
Maximum apparent power (kVA) |
Specifies the output upper threshold for the maximum apparent power to adapt to the capacity requirements of standard and customized inverters. |
[Maximum active power, Smax] |
Maximum active power (kW) |
Specifies the output upper threshold for the maximum active power to adapt to different market requirements. |
[0.1, Pmax] |
The lower threshold for the maximum apparent power is the maximum active power. To lower the maximum apparent power, lower the maximum active power first.