Setting PCS Parameters

Grid code

Set this parameter based on the grid code of the country or region where the device is used.

Output mode

Specifies the supported power grid types.

Isolation settings

Specifies the device grounding status at DC side and the connection to the power grid.

Auto start upon grid recovery

Specifies whether to allow the device to automatically start after the power grid recovers.

On-grid recovery time (s)

Specifies the time after which the device begins restarting after the power grid recovers.

Quick startup for short-time grid disconnection

Specifies whether to allow the device to quickly start after the power grid recovers from a short-time failure.

Duration for determining short-time grid disconnection (ms)

The standards of certain countries and regions require that the device should not disconnect from the power grid if the power grid experiences a short-time failure. After the fault is rectified, the device output power needs to be quickly restored.

Soft start time after grid failure (s)

Specifies the time for the power to gradually increase when the device restarts after the power grid recovers.

Upper voltage threshold (V) for grid connection

According to the standards of certain countries and regions, initial grid connection is not allowed when the grid voltage is higher than the maximum voltage for grid connection.

Lower voltage threshold (V) for grid connection

According to the standards of certain countries and regions, initial grid connection is not allowed when the grid voltage is below the minimum voltage for grid connection.

Upper frequency threshold (Hz) for grid connection

According to the standards of certain countries and regions, initial grid connection is not allowed when the grid frequency is higher than the maximum frequency for grid connection.

Lower frequency threshold (Hz) for grid connection

According to the standards of certain countries and regions, initial grid connection is not allowed when the grid frequency is below the minimum frequency for grid connection.

Grid reconnection voltage upper limit (V)

According to the standards of certain countries and regions, grid reconnection is not allowed when the grid voltage is higher than the maximum voltage for grid reconnection.

Grid reconnection voltage lower limit (V)

According to the standards of certain countries and regions, grid reconnection is not allowed when the grid voltage is below the minimum grid voltage for grid reconnection.

Grid reconnection frequency upper limit (Hz)

According to the standards of certain countries and regions, grid reconnection is not allowed when the grid frequency is higher than the maximum grid frequency for grid reconnection.

Grid reconnection frequency lower limit (Hz)

According to the standards of certain countries and regions, grid reconnection is not allowed when the grid frequency is below the minimum grid frequency for grid reconnection.

Grid automatic reconnection time

Specifies the time after which the device begins restarting after the power grid recovers.

Insulation resistance protection threshold (MΩ)

To ensure device safety, the device detects the insulation resistance of the DC side to the ground when it starts a self-check. If the detected value is less than the preset value, the device does not connect to the grid nor start.

Active islanding protection

Specifies whether to enable the active islanding protection function.

Passive islanding protection

Specifies whether to enable the passive islanding protection function.

Unbalance voltage protection (%)

Specifies the device protection threshold when the power grid voltage is unbalanced.

Phase protection threshold (°)

The Japanese standard requires that during passive islanding detection, the protection should be triggered if an abrupt voltage phase change is detected.

Phase angle offset protection

The standards of certain countries and regions require that the device needs to be protected when the phase angle offset of the power grid three phases exceeds a certain value.

10-minute UV protection

Specifies the 10-minute undervoltage protection threshold.

10-minute UV protection time

Specifies the 10-minute undervoltage protection duration.

10 minute OV protection (V)

Specifies the 10-minute overvoltage protection threshold.

10 minute OV protection time (ms)

Specifies the 10-minute overvoltage protection duration.

Level-N OV protection (V)

Specifies the level-N grid overvoltage protection threshold.

Level-N OV protection time (ms)

Specifies the level-N grid overvoltage protection duration.

Level-N UV protection (V)

Specifies the level-N grid undervoltage protection threshold.

Level-N UV protection time (ms)

Specifies the level-N grid undervoltage protection duration.

Frequency change rate protection

If this parameter is set to Enable, the device is protected when the power grid frequency changes too fast.

Frequency change rate threshold (Hz/s)

Specifies the frequency change rate protection threshold.

Duration threshold (s) for frequency change rate protection

The device is protected when the grid frequency change duration exceeds the value.

Level-N OF protection (Hz)

Specifies the level-N grid overfrequency protection threshold.

Level-N OF protection time (ms)

Specifies the level-N grid overfrequency protection duration.

Level-N UF protection (Hz)

Specifies the level-N grid underfrequency protection threshold.

Level-N UF protection time (ms)

Specifies the level-N grid underfrequency protection duration.

Communication interruption duration

Specifies the duration for determining communication interruption between the device and the SmartLogger.

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Shutdown on communication failure

The standards of certain countries and regions require that the device shut down after the communication is interrupted for a certain time.

If this parameter is set to Enable, the device automatically shuts down after the Communication interruption duration is reached.

Automatic startup upon communication recovery

If this parameter is set to Enable, the device automatically starts after communication recovers. If this parameter is set to Disable, the device needs to be started manually after communication recovers.

This parameter is displayed when the Shutdown on communication failure is set to Enable.

Protection in the case of communication failure

In reverse current prevention scenarios, if this parameter is set to Enable, the device performs active power percentage derating when the communication between the device and the SmartLogger or Smart Dongle is interrupted for a period longer than Communication disconnection detection time. The device performs protection according to the set power.

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Communication disconnection detection time (s)

Specifies the fail-safe detection time for the disconnection between the device and the SmartLogger or Smart Dongle.

This parameter is displayed when the Protection in the case of communication failure is set to Enable.

Active power mode when communication fails

Specifies the protection threshold of the active power after the communication is interrupted. The value can be a percentage or a fixed value.

This parameter is displayed when the Protection in the case of communication failure is set to Enable.

Active power limit when communication fails

(%)

Specifies the active power threshold in percentage.

This parameter is displayed when the Protection in the case of communication failure is set to Enable and Active power threshold when communication fails is set to a percentage.

Active power limit when communication fails

(kW)

Specifies the active power threshold as a fixed value.

This parameter is displayed when the Protection in the case of communication failure is set to Enable and Active power threshold when communication fails is set to a fixed value.

Reactive power mode when communication fails

Specifies the protection threshold of the reactive power after the communication is interrupted, including Q/S and power factor.

This parameter is displayed when the Protection in the case of communication failure is set to Enable.

Reactive power limit when communication fails (%)

Specifies the Q/S threshold of the reactive power (%).

This parameter is displayed when Protection in the case of communication failure is set to Enable and Reactive power mode when communication fails is set to Power factor.

Reactive power limit when communication fails

Specifies the power factor threshold of the reactive power.

This parameter is displayed when the Protection in the case of communication failure is set to Enable and Reactive power mode when communication fails is set to Q/S.

Soft start time (s)

Specifies the duration for the power to gradually increase when the device starts.

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Shutdown gradient (%/s)

Specifies the power change rate when the device shuts down.

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Shutdown at 0% power limit

If this parameter is set to Enable, the device shuts down after receiving the 0% power limit command. If this parameter is set to Disable, the device does not shut down after receiving the 0% power limit command.

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Hibernate at night

The device performs the monitoring function at night. If this parameter is set to Enable, the monitoring function of the device will hibernate at night to reduce power consumption.

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Delayed upgrade

This parameter is mainly used in the upgrade scenarios where the power supply at DC side is disconnected.

After the upgrade starts, if Delayed upgrade is set to Enable, the upgrade package is loaded first. After the DC side power supply recovers and the activation conditions are met, the device automatically activates the upgrade.

HVRT

HVRT is short for high voltage ride-through. When the grid voltage is abnormally high for a short time, the device cannot disconnect from the power grid immediately and has to work for some time.

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HVRT threshold (V)

Specifies the threshold for triggering HVRT. The threshold settings should meet the local grid standard.

This parameter is displayed when HVRT is set to Enable.

Positive-sequence reactive power compensation factor in HVRT

During HVRT, the device needs to generate positive-sequence reactive power to support the power grid. This parameter is used to set the positive-sequence reactive power generated by the device.

For example, if you set this parameter to 2, the increment of positive-sequence reactive current generated by the device is 20% of the rated current when the AC voltage increases by 10% during HVRT.

Negative-sequence reactive power compensation factor in HVRT

During HVRT, the device needs to generate negative-sequence reactive power to support the power grid. This parameter is used to set the negative-sequence reactive power generated by the device.

For example, if you set this parameter to 2, the increment of negative-sequence reactive current generated by the device is 20% of the rated current when the AC voltage increases by 10% during HVRT.

LVRT

LVRT is short for low voltage ride-through. When the grid voltage is abnormally low for a short time, the device cannot disconnect from the power grid immediately and has to work for some time.

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LVRT threshold (V)

Specifies the threshold for triggering LVRT. The threshold settings should meet the local grid standard.

This parameter is displayed when LVRT is set to Enable.

Positive-sequence reactive power compensation factor in LVRT

During LVRT, the device needs to generate positive-sequence reactive power to support the power grid. This parameter is used to set the positive-sequence reactive power generated by the device.

For example, if you set this parameter to 2, the increment of positive-sequence reactive current generated by the device is 20% of the rated current when the AC voltage decreases by 10% during LVRT.

Negative-sequence reactive power compensation factor in LVRT

During LVRT, the device needs to generate negative-sequence reactive power to support the power grid. This parameter is used to set the negative-sequence reactive power generated by the device.

For example, if you set this parameter to 2, the increment of negative-sequence reactive current generated by the device is 20% of the rated current when the AC voltage decreases by 10% during LVRT.

LVRT active current maintenance coefficient

Specifies the active current proportional coefficient before and during LVRT.

Percentage of LVRT reactive current limiting

During LVRT, the device needs to limit the reactive current.

For example, if you set Percentage of LVRT reactive current limiting to 50, the reactive current upper limit of the device is 50% of the rated current during LVRT.

Threshold of LVRT zero-current mode

When Zero current due to power grid fault is set to Enable, if the power grid voltage is less than the value of Threshold of LVRT zero-current mode during LVRT, the zero current mode is used. Otherwise, the mode configured in LVRT mode is used.

LVRT mode

Sets LVRT mode. The options are Zero-current mode, Constant current mode, Reactive power priority mode, and Active power priority mode.

LVRT characteristic curve

Specifies the low voltage ride-through capability of the device.

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Deactivate grid voltage protection during HVRT/LVRT

Specifies whether to shield the undervoltage protection function during LVRT or HVRT.

This parameter is displayed when LVRT or HVRT is set to Enable.

VRT exit hysteresis threshold

Specifies the LVRT/HVRT recovery threshold.

• This parameter is displayed when LVRT or HVRT is set to Enable.
• LVRT recovery threshold = LVRT threshold + VRT exit hysteresis threshold
• HVRT recovery threshold = HVRT threshold – VRT exit hysteresis threshold

VRT active current limiting (%)

Specifies the percentage of the maximum active current to the rated current during fault ride-through (FRT).

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VRT active power recovery gradient

Specifies the recovery rate when the active current recovers to the value at the moment before FRT.

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Zero current due to power grid fault

Specifies whether to enable the Zero current due to power grid fault function.

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Grid voltage jump triggering threshold

This parameter can be set only for the VDE4120.

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Voltage rise suppression

The standards of certain countries and regions require that when the output voltage exceeds a certain value, the device must suppress voltage rise by outputting reactive power and reducing active power.

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Reactive power adjustment threshold (%) for voltage rise suppression

The standards of certain countries and regions require that the device generate a certain amount of reactive power when the output voltage exceeds a certain value.

• This parameter is displayed when Voltage rise suppression is set to Enable.
• The value of Voltage rise suppression active derating point must be greater than that of Reactive power adjustment threshold for voltage rise suppression.

Active power derating threshold (%) for voltage rise suppression

The standards of certain countries and regions require that the active power of the device be derated by a certain slope when the output voltage exceeds a certain value.

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P-U characteristic curve

The device adjusts P/Pn (the ratio of the active power to the rated power) in real time based on U/Un(%) (the ratio of the actual power grid voltage to the rated power grid voltage).

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P-U characteristic curve adjustment time

Specifies the time from the response to the end of the adjustment based on the P-U curve.

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Frequency regulation

The standards of certain countries and regions require that if the power grid frequency fluctuates around a certain value, the device needs to fine-tune the active power output based on the frequency regulation ratio to help stabilize the power grid frequency. In this case, set this parameter to Enable.

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Adjustment ratio of frequency modulation control

Specifies the adjustment ratio of the active power output.

This parameter is displayed when the Frequency regulation is set to Enable.

Response deadband of frequency-based control

Specifies the threshold for triggering the frequency modulation control. For example, if this parameter is set to 0.1 Hz, the frequency modulation control is not triggered when the frequency is within reference frequency±0.1 Hz.

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Power change gradient of frequency-based control

Specifies the active power change gradient of frequency modulation.

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Power change limit of frequency-based control

Specifies the upper limit for active power adjustment of frequency modulation.

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Delay response time of frequency-based control

Specifies the delay response time of frequency modulation.

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Power derating caused by overfrequency

If this parameter is set to Enable, the active power of the device will be derated according to a certain slope when the grid frequency exceeds the frequency that triggers overfrequency derating.

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Cutoff frequency of overfrequency derating (Hz)

Specifies the frequency threshold for cutting off overfrequency derating.

• This parameter is displayed when the Power derating caused by overfrequency is set to Enable.
• The parameter setting should meet the following condition: Quit frequency of overfrequency derating ≤ Trigger frequency of overfrequency derating < Cutoff frequency of overfrequency derating.

Cutoff power of overfrequency derating (%)

Specifies the power threshold for cutting off overfrequency-caused derating.

Trigger frequency of overfrequency derating (Hz)

The standards of certain countries and regions require that the output active power of devices be derated when the power grid frequency exceeds a certain value.

Quit frequency of overfrequency derating (Hz)

Specifies the frequency threshold for exiting overfrequency derating.

Power drop gradient of overfrequency derating (%/s)

Specifies the decrease rate of the overfrequency derating power.

Power recovery gradient of overfrequency derating (%/min)

Specifies the recovery rate of the overfrequency derating power.

Frequency detection filter time (ms)

Specifies the frequency detection filter time.

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Recovery delay of frequency-based active power derating

Specifies the exiting delay time after the frequency reaches the quit frequency of overfrequency derating.

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Execution delay of frequency-based active power derating

Specifies the effective delay time of overfrequency derating when the frequency reaches the trigger frequency of overfrequency derating.

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Hysteresis of frequency-based active power derating

Specifies whether to enable overfrequency derating hysteresis.

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Power raising caused by underfrequency

The standards of certain countries and regions require that when the power grid frequency is lower than Trigger frequency of underfrequency rise power, the device needs to increase the active power output to help increase the power grid frequency. In this case, set this parameter to Enable.

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Recovery gradient of underfrequency rise power (%/min)

Specifies the power recovery rate of underfrequency-caused raising.

This parameter is displayed when the Power raising caused by underfrequency is set to Enable.

Cutoff power of underfrequency rise power (Hz)

Specifies the frequency threshold for stopping underfrequency-caused raising.

Cutoff power of underfrequency rise power (%)

Specifies the cutoff power of the power raising caused by underfrequency.

Trigger frequency of underfrequency rise power (Hz)

Specifies the frequency threshold for underfrequency-caused power raising.

Quit frequency of underfrequency rise power (Hz)

Specifies the quit frequency of the power raising caused by underfrequency.

O&M via USB connection

Specifies the USB O&M port status: Permanently Enabled, Disabled in Idle State, or Permanently Disabled.

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USB wakeup

Used to remotely wake up the USB O&M port. After being idle for 4 hours, the port is automatically disabled.

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Quick startup for short-time grid disconnection

The default value is Disable. Specifies whether to allow the device to quickly start after the power grid recovers from a short-time failure.

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Microgrid compatibility

The default value is Disable. If the PCS and diesel generator run in parallel and the PCS works in PQ mode, set this parameter to Enable. When Microgrid compatibility is set to Enable, the grid-connected current source PCS supports a higher ratio of PV to energy storage in addition to the feature of the original country grid code.

If this parameter is set incorrectly, the Smart PCS may run abnormally.

Working mode

The default value is PQ. You need to set the working mode during deployment. Set Working mode to VSG in off-grid scenarios and PQ in grid-tied scenarios.

After this parameter is set, the device shuts down.

Per unit armature resistance

The default value is 2. Specifies the resistance per unit value for armature windings of the virtual synchronous generator.

This parameter is displayed when Working mode is set to VSG.

Per unit armature inductive reactance

The default value is 1. Specifies the inductive reactance per unit value for armature windings of the virtual synchronous generator.

VSG inertia time constant

The default value is 1. Specifies the time required for the virtual rotor of the virtual synchronous generator to reach the rated speed from the static state under the rated torque.

P-F adjustment coefficient

The default value is 1. Specifies the frequency deviation corresponding to the rated active power of the virtual synchronous generator.

Q-V adjustment coefficient

The default value is 3. Specifies the voltage deviation corresponding to the rated reactive power of the virtual synchronous generator.

P-V adjustment coefficient

The default value is 0. Specifies the voltage deviation corresponding to the rated active power of the virtual synchronous generator.

Q-F adjustment coefficient

The default value is 0. Specifies the frequency deviation corresponding to the rated reactive power of the virtual synchronous generator.

VSG output voltage correction coefficient

The default value is 100. Corrects the deviation caused by the transformer ratio error.

VSG output frequency correction coefficient

The default value is 100. Corrects the PCS output frequency deviation.

VSG frequency damping coefficient

The default value is 7.2. Specifies the power factor that prevents the frequency change of the virtual synchronous generator.

VSG excitation time constant

The default value is 0. Specifies the time required for the excitation of the virtual synchronous generator to reach the rated voltage.

VSG excitation damping coefficient

The default value is 0. Specifies the power factor that prevents the voltage change of the virtual synchronous generator.

Wired carrier synchronization

Enables or disables wired carrier synchronization. The default value is Disable.

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Delay compensation for wired carrier synchronization

The default value is 0. Specifies the value of delay compensation for wired carrier synchronization.

This parameter is displayed when Wired carrier synchronization is set to Enable.

Wired power frequency synchronization

Enables or disables wired power frequency synchronization. The default value is Disable.

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Delay compensation for wired power frequency synchronization

The default value is 0. Specifies the value of delay compensation for wired power frequency synchronization.

This parameter is displayed when Wired power frequency synchronization is set to Enable.

Voltage adjustment value for VSG synchronous control (%)

The default value is 0. Specifies the adjustment value of the PCS control output voltage in VSG mode.

• Value range: [–10.0, 10.0]
• The value is adjusted based on the offset per unit value. For example, if the rated output voltage is 800 V and the output voltage needs to be adjusted to 805 V, the adjustment value is 5/800 x 100%.

Frequency adjustment value for VSG synchronous control (%)

The default value is 0. Specifies the adjustment value of the PCS output frequency in VSG mode.

• Value range: [–10.0, 10.0]
• The value is adjusted based on the offset per unit value. For example, if the rated output frequency is 50 Hz and the output frequency needs to be adjusted to 50.5 Hz, the adjustment value is 0.5/50 x 100%.

Remote power scheduling

If this parameter is set to Enable, the device responds to the scheduling instruction from the remote port. If this parameter is set to Disable, the device does not respond to the scheduling instruction from the remote port.

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Schedule instruction valid duration (s)

Specifies the validity period of the scheduling instruction.

When this parameter is set to 0, the scheduling instruction takes effect permanently.

Active power change gradient (%/s)

Specifies the change rate of the device active power.

This parameter is displayed when Remote power scheduling is set to Enable.

Active power (kW)

Adjusts the active power output of the device by fixed value.

Active power (%)

Adjusts the active power output of the device by percentage.

Reactive power change gradient (%/s)

Specifies the change rate of the device reactive power.

Power factor

Specifies the power factor of the device.

Reactive power compensation (Q/S)

Specifies the reactive power of the device.

Reactive power at night

In some specific application scenarios, a power grid company requires that the device can perform reactive power compensation at night to ensure that the power factor of the local power grid meets requirements.

This parameter is displayed when Isolation is set to Input ungrounded (with TF).

Enable reactive power parameters at night

When this parameter is set to Enable, the device outputs reactive power based on the setting of Reactive power output at night. Otherwise, the device executes the remote scheduling command.

This parameter is displayed when Reactive power at night is set to Enable.

Fixed nighttime reactive power

The device outputs reactive power based on this value if there is no remote scheduling command, Reactive power at night is set to Enable, and the DC input is disconnected.

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Q-U characteristic curve

The device adjusts Q/S (the ratio of the output reactive power to apparent power) in real time based on U/Un(%) (the ratio of the actual power grid voltage to the rated power grid voltage).

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Q-U characteristic curve mode

Specifies the reactive power compensation mode of the device output.

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Delay for Q-U characteristic curve to take effect

Specifies the delay time for Q-U adjustment.

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Power percentage for triggering Q-U scheduling

Specifies the reference apparent power in percentage. When the actual apparent power of the device is greater than the value of this parameter, the Q-U characteristic curve scheduling function is enabled.

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Power percentage for exiting Q-U scheduling

Specifies the P/Pn when the device exits the Q-U scheduling.

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Minimum PF of Q-U characteristic curve

Specifies the minimum power factor for Q-U adjustment.

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Q-P characteristic curve

The device adjusts Q/Pmax (the ratio of the reactive power to the maximum active power) in real time based on P/Pmax (the ratio of the active power to the maximum active power).

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PF-U characteristic curve

The device adjusts the power factor in real time based on U/Un(%) (the ratio of the actual power grid voltage to the rated power grid voltage).

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PF-U voltage detection filter time

Specifies the time for filtering the grid voltage in the PF-U curve.

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cosφ-P/Pn characteristic curve

The device adjusts the output power factor cosφ in real time based on P/Pn(%).

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cosφ-P/Pn triggering voltage

Specifies the voltage threshold for triggering reactive power compensation based on the cosφ-P curve.

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cosφ-P/Pn exit voltage

Specifies the voltage threshold for exiting reactive power compensation based on the cosφ-P curve.

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Reactive power adjustment time

Specifies the adjustment time for the reactive power to reach the target value during reactive power adjustment.

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Apparent power baseline

Set the apparent power baseline for power scheduling. The value cannot be greater than the maximum apparent power.

Active power baseline

Set the active power baseline for power scheduling. The value cannot be greater than the maximum active power.

Total energy yield adjustment

A calibrating coefficient for the total energy yield to ensure that the reported energy yield is consistent with the actual energy yield at the grid-connection point

Adjustment of total power supply from grid

A calibrating coefficient for the total power supply from the grid to ensure that the reported energy yield is consistent with the actual power supply from grid