Procedure

1. Choose Function Menu > Settings > Grid Parameters and set grid parameters.
   Figure 7-25 Grid parameters
   
   Table 7-15 Grid parameters

   Parameter	Description	Value Range (Vn: Rated Voltage; Fn: Rated Frequency)
   Grid code	Set this parameter based on the grid code of the country or region where the SUN2000 is used and the SUN2000 application scenario.	N/A
   Isolation	Specifies the working mode of the SUN2000 according to the grounding status at the DC side and the connection status to the grid.	Input ungrounded, without TF Input ungrounded, with TF
   Output mode	Specifies whether the inverter output has a neutral wire based on the application scenario.	Three-phase three-wire Three-phase four-wire
   PQ mode	If this parameter is set to PQ mode 1, the maximum AC output power equals the maximum apparent power. If this parameter is set to PQ mode 2, the maximum AC output power equals the rated output power.	PQ mode 1 PQ mode 2
   Auto start upon grid recovery	Specifies whether to allow the SUN2000 to automatically start after the power grid recovers.	Disable Enable
   On-grid recovery time (s)	Specifies the waiting time for SUN2000 restart after the power grid recovers.	[0, 7200]
   Grid reconnection voltage upper limit (V)	The standards of certain countries and regions require that the SUN2000 must not export power to the power grid again when the grid voltage exceeds the value of Grid reconnection voltage upper limit after the SUN2000 shuts down due to a fault.	[100% Vn, 136% Vn]
   Grid reconnection voltage lower limit (V)	The standards of certain countries and regions require that the SUN2000 must not export power to the power grid again when the grid voltage is below the value of Grid reconnection voltage lower limit after the SUN2000 shuts down due to a fault.	[45% Vn, 100% Vn]
   Grid reconnection frequency upper limit (Hz)	The standards of certain countries and regions require that the SUN2000 must not export power to the power grid again when the grid frequency exceeds the value of Grid reconnection frequency upper limit after the SUN2000 shuts down due to a fault.	[100% Fn, 120% Fn]
   Grid reconnection frequency lower limit (Hz)	The standards of certain countries and regions require that the SUN2000 must not export power to the power grid again when the grid frequency is below the value of Grid reconnection frequency lower limit after the SUN2000 shuts down due to a fault.	[80% Fn, 100% Fn]
   Reactive power compensation (cosφ-P) trigger voltage (%)	Specifies the voltage threshold for triggering reactive power compensation based on the cosφ-P curve.	[100, 136]
   Reactive power compensation (cosφ-P) exit voltage (%)	Specifies the voltage threshold for exiting reactive power compensation based on the cosφ-P curve.	[70, 100]

Procedure

1. Choose Function Menu > Settings > Protection Parameters and set protection parameters.
   Figure 7-26 Protection parameters
   
   Table 7-16 Protection parameters

   Parameter	Description	Value Range (Vn: Rated Voltage; Fn: Rated Frequency)
   Unbalance voltage protection (%)	Specifies the solar inverter protection threshold when the power grid voltage is unbalanced.	[0.0, 50.0]
   10 minute OV protection (V)	Specifies the 10-minute overvoltage protection threshold.	[1 x Vn, 1.25 x Vn]
   10 minute OV protection time (ms)	Specifies the 10-minute overvoltage protection duration.	[50, 7200000]
   Level-N OV protection (V)	Specifies the level-N grid overvoltage protection threshold. NOTE: N can be 1, 2, 3, 4, 5, or 6. When HVRT is set to Enable, and the value of Level-1 OV protection is larger than that of HVRT threshold, the solar inverter may repeatedly start and shut down if the power grid voltage is between the two values.	Level-1 OV protection: [1 x Vn, 1.25 x Vn] Level-2 OV protection: [1 x Vn, 1.36 x Vn]
   Level-N OV protection time (ms)	Specifies the level-N grid overvoltage protection duration. NOTE: N can be 1, 2, 3, 4, 5, or 6.	[50, 7200000]
   Level-N UV protection (V)	Specifies the level-N grid undervoltage protection threshold. NOTE: N can be 1, 2, 3, 4, 5, or 6. When LVRT is set to Enable, and the value of Level-1 UV protection is less than that of LVRT threshold, the solar inverter may repeatedly start and shut down if the power grid voltage is between the two values.	[0.15 x Vn, 1 x Vn]
   Level-N UV protection time (ms)	Specifies the level-N grid undervoltage protection duration. NOTE: N can be 1, 2, 3, 4, 5, or 6.	[50, 7200000]
   Level-N OF protection (Hz)	Specifies the level-N grid overfrequency protection threshold. NOTE: N can be 1, 2, 3, 4, 5, or 6.	[1 x Fn, 1.15 x Fn]
   Level-N OF protection time (ms)	Specifies the level-N grid overfrequency protection duration. NOTE: N can be 1, 2, 3, 4, 5, or 6.	[50, 7200000]
   Level-N UF rotection (Hz	Specifies the level-N grid underfrequency protection threshold. NOTE: N can be 1, 2, 3, 4, 5, or 6.	[0.85 x Fn, 1 x Fn]
   Level-N UF protection time (ms)	Specifies the level-N grid underfrequency protection duration. NOTE: N can be 1, 2, 3, 4, or 5.	[50, 7200000]

Prerequisites

After you connect a Smart Power Sensor to the solar inverter by choosing Function Menu > Maintenance > Device Mgmt, you can set grid-tied control parameters to control the active and reactive power outputs of the grid-tied point.

Procedure

1. Choose Function Menu > Settings > Grid-tied Point Control, enter the app login password, and set power control parameters based on the PV plant requirements.
   Figure 7-28 Grid-tied point control
   
   Table 7-18 Grid-tied control parameters

   Parameter	Description	Value Range
   Active power control mode	Specifies the active power output mode at the grid-tied point.	No limit Grid connection with zero power Grid connection with limited power (kW) Grid connection with limited power (%)
   Closed-loop controller	Specifies the grid-tied power controller. Before setting the parameter, confirm the controller type. Incorrect setting will result in abnormal power output of the solar inverter. Solar inverter applies only to the scenario where a single solar inverter is used or where a single solar inverter is used with an SDongle.	SDongle/SmartLogger Solar inverter
   Limitation mode	Specifies the active power limitation mode as required by the power grid.	Total power Single-phase power
   PV plant capacity (kW)	Specifies the PV array capacity.	[0, 2000]
   Maximum grid feed-in power (kW)	In Grid connection with limited power (kW) mode, set the maximum power fed to the power grid from the PV array.	[–1000, PV plant capacity]
   Maximum grid feed-in power (%)	In Grid connection with limited power (%) mode, set the proportion of the maximum power fed to the power grid from the PV array to the capacity of the PV plant.	[0, 100]
   Power lowering adjustment period (s)	Specifies the interval for sending adjustment commands.	[0.2, 300]
   Maximum protection time (s)	Specifies the protection duration to determine whether the communication between the external controller and the Smart Power Sensor is interrupted.	[0.2, 300]
   Power raising threshold (kW)	Specifies the threshold for power raising.	[0, 50]
   Fail-safe power (%)	When the communication between the SDongle/SmartLogger as well as the Smart Power Sensor and solar inverter is interrupted, the solar inverter generates power based on this threshold.	[0, 100]
   Reactive power control mode	Specifies the reactive power output mode at the grid-tied point.	No output Pwr factor closed-loop control
   Power factor	Specifies the target value for the power factor of the Smart Power Sensor.	(–1, –0.8] U [0.8, 1]
   Adjustment period (s)	Specifies the interval for sending adjustment commands.	[0.2, 10]
   Adjustment deadband	Specifies the adjustment power factor precision.	[0.001, 1]
   Fail-safe power factor	When the communication between the SDongle/SmartLogger as well as the Smart Power Sensor and solar inverter is interrupted, the solar inverter generates power based on this threshold.	(–1, –0.8] U [0.8, 1]
   Communication disconnection fail-safe	When this parameter is set to Enable, and the communication between the solar inverter and the SDongle/SmartLogger is interrupted for a certain period (set by Communication disconnection detection time), the solar inverter generates power based on Fail-safe power.	Disable Enable
   Communication disconnection detection time (s)	Specifies the protection duration to determine whether the communication between the SDongle/SmartLogger and the solar inverter is interrupted.	[1, 10]

Procedure

1. Choose Function Menu > Settings > Power Adjustment and set power adjustment parameters.
   Figure 7-29 Power adjustment parameters
   
   Table 7-19 Power adjustment parameters

   Parameter	Description	Value Range (Smax: Maximum Apparent Power; Pmax: Maximum Active Power; Qmax: Maximum Reactive Power)
   Remote power schedule	If this parameter is set to Enable, the solar inverter responds to the remote power scheduling command. If it is set to Disable, the solar inverter does not respond to the command.	Disable Enable
   Schedule instruction valid duration (s)	Adjusts the time for maintaining the scheduling command.	[0, 86400]
   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.	[Pmax, Smax_limit] or [Pmax, Smax]
   Maximum active power (kW)	Specifies the output upper threshold for the maximum active power to adapt to different market requirements.	[0.1, Pmax]
   Shutdown at 0% power limit	If this parameter is set to Enable, the solar inverter shuts down after receiving the 0% power limit command. If this parameter is set to Disable, the solar inverter does not shut down after receiving the 0% power limit command.	Disable Enable
   Active power change gradient (%/s)	Adjusts the change speed of the active power of the solar inverter.	[0.1, 1000]
   Fixed active power derating (kW)	Adjusts the active power output of the solar inverter by fixed value.	[0, Pmax]
   Active power percentage derating (%)	Adjusts the active power output of the solar inverter by percentage. If this parameter is set to 100, the solar inverter generates power based on the maximum output power.	[0, 100]
   Reactive power output at night	In some specific application scenarios, a power grid company requires that the inverter can perform reactive power compensation at night to ensure that the power factor of the local power grid meets requirements.	Disable Enable
   Enable reactive power parameters at night	When this parameter is set to Enable, the inverter outputs reactive power based on the setting of Reactive power compensation at night. Otherwise, the inverter executes the remote scheduling command.	Disable Enable
   Reactive power compensation at night (kVar)	During the reactive power compensation at night, the reactive power is scheduled by fixed value.	[–Qmax, Qmax]
   Reactive power change gradient (%/s)	Specifies the change speed of the inverter reactive power.	[0.1, 1000]
   Plant active power gradient (min/100%)	Specifies the rate of active power rise due to sunlight changes.	[0, 60]
   Filter duration for average active power (ms)	Specifies the period of active power rise due to sunlight changes. This parameter is used with Plant active power gradient.	[20, 300000]
   Power factor	Specifies the power factor of the inverter.	(–1.000, –0.800] U [0.800, 1.000]
   Reactive power compensation (Q/S)	Specifies the reactive power output by the inverter.	(–1, 1]
   Overfrequency derating	If this parameter is set to Enable, the active power of the inverter will be derated according to a certain slope when the grid frequency exceeds the frequency that triggers overfrequency derating.	Disable Enable
   PF (U) voltage detection filter time (s)	Specifies the time for filtering the grid voltage in the PF-U curve.	[0.1, 120]
   Apparent power baseline (kVA)	Adjust the apparent output baseline of the inverter.	[Pmax, Smax_real]
   Active power baseline (kW)	Adjusts the active output baseline of the inverter.	[0.1, Min(Pmax_real, Smax)]