Setting Active Power Control
If the plant has requirements of power limitation, the power grid scheduling personnel should limit the active power or disable all the active power for the plant, that is, to enable the active power derating mode.
- Choose . On the page that is displayed, check that Remote power schedule is set to Enable.
- Set the parameters for active power control and click Submit.Figure 6-71 Active power control
No Limit
Parameter |
Description |
|---|---|
If this parameter is set to No limit, the device operates at full load, and the Smart PCS limits the power based on the energy storage control policy. |
DI Active Scheduling
- When setting this function, ensure that the user-defined DI port is not occupied. Otherwise, the setting will fail.
- When setting this function, ensure that the SmartLogger is correctly connected to a ripple control receiver. (In Germany and some other European areas, a ripple control receiver is used to convert a power grid scheduling signal to a dry contact signal, in which a dry contact is needed.)
- When both Remote communication scheduling and DI are enabled, the control with a lower active power percentage value is preferentially responded.
Parameter |
Description |
|---|---|
Set this parameter to DI active scheduling. |
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Set this parameter to Start-up, DI active scheduling and remote communication scheduling work at the same time. |
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DI NOTE:
DI parameters include DI1, DI2, DI3, DI4, and Percentage(%). |
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Percentage Fixed-Value Limitation (Open Loop)
The SmartLogger provides simplified active power percentage configuration as well as power control automation, that is, to automatically adjust the active power derating percentage in different periods of a day.
Parameter |
Description |
|---|---|
Set this parameter to Percentage fixed-value limitation (open loop) to control the maximum output power of the devices by time segment. |
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If the device is required to run with specified maximum power in certain periods of a day, add records based on site requirements. When multiple time points are set, the device will run with the maximum power specified for the time point that is earlier than and the closest to the current system time. For example, if you add 00:00:00 and 12:00:00 on the WebUI and the current system time is 14:30:00, the device will run with the maximum power specified for 12:00:00. |
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Remote communication scheduling
The management system or independent power adjustment device sends scheduling commands over the communications port that supports Modbus-TCP, GOOSE, or IEC104, without the need of user configuration or operation. The SmartLogger can automatically switch between scheduling modes and send scheduling commands.
Parameter |
Description |
|---|---|
Set this parameter to Remote communication scheduling. The SmartLogger parses the scheduling command delivered by the upper-layer management system to valid instruction data that can be identified by the devices in the plant and delivers the data to all devices connected to the SmartLogger. As the Remote communication scheduling mode has a higher priority, the SmartLogger automatically changes Active power control mode to Remote communication scheduling after receiving a scheduling command from the upper-layer management system. |
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The value can be Disable, Strategy 1, Strategy 2 or Strategy 3. The default value is Strategy 1.
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Coefficient for calculating the target value of active power adjustment. The default value is 1.000. |
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The default value is Disable. If this parameter is set to Enable, the SmartLogger shuts down the device when the communication between the SmartLogger and the scheduling backend is interrupted for a period longer than the set value of Time for communication exception detection. |
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The default value is 300. This parameter is used only for shutdown protection when the communication between the SmartLogger and the scheduling backend is abnormal. If the communication is interrupted for a period longer than the set value, it is determined as abnormal. |
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The default value is Enable. If this parameter is set to Enable, the device automatically starts if the communication recovers after an exception. |
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The default value is Disable. If this parameter is set to Enable, the SmartLogger controls the device in the following ways after the communication between the SmartLogger and the scheduling backend is interrupted for a period longer than the set value of Active power scheduling timeout threshold for triggering solar inverter power limiting.
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The default value is 300.0. This parameter is used only for active power limiting protection when the communication between the SmartLogger and the scheduling backend is abnormal. If the communication is interrupted for a period longer than the set value, active power limiting protection is started. |
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The default value is 0.0. After Limit solar inverter power upon active power scheduling timeout is enabled, if the communication between the SmartLogger and the scheduling backend is interrupted for a period longer than the set value of Active power scheduling timeout threshold for triggering solar inverter power limiting, the SmartLogger limits the active power of the inverter based on the set value of this parameter. |
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The default value is 0.0. After Limit solar inverter power upon active power scheduling timeout is enabled, if the communication between the SmartLogger and the scheduling backend is interrupted for a period longer than the set value of Active power scheduling timeout threshold for triggering solar inverter power limiting, the SmartLogger limits the active power of the Smart PCS based on the set value of this parameter. |
Export Limitation (kW)
- You are advised to choose and enable the function of limiting feed-in power.
- To enable this function, you need to set meter, inverter/Smart PCS, and export limitation parameters. This section describes how to set export limitation parameters.
- Before setting the parameters, ensure that the power meter is correctly connected to the SmartLogger.
- Set export limitation parameters and click Submit.
Parameter
Description
Active power control mode Set this parameter to Export Limitation(kW).
Start control When this parameter is set to Yes, the power limiting function takes effect.
Electric meter power direction - Positive: default value.
- Cables are correctly connected to the meter.
- If cables are reversely connected to the meter and the NMS does not support reverse connection[1], set Meter access direction[2] to Reverse and Electric meter power direction to Positive.
- Reverse: applicable to export+import meters. If cables are reversely connected to the meter and the NMS supports reverse connection, set Meter access direction to Reverse_Report raw data and Electric meter power direction to Reverse.
Limitation mode Total power : controls the total power at the grid-connection point to limit the power fed to the power grid.Single-phase power : controls the power of each phase at the grid-connection point to limit the power fed to the power grid.
Maximum grid feed-in power Indicates the maximum power that the device can feed into the power grid.
Suggestion: Set this parameter based on the feed-in threshold allowed by the power grid company.
Power lowering adjustment period Specifies the period for lowering the device output power.
Maximum protection time Specifies the maximum duration from the time when the SmartLogger detects feed-in to the time when the device output power reaches 0.
Suggestion: Set this parameter based on the maximum feed-in duration allowed by the power grid company.
Power raising threshold When the power supply from the grid reaches this threshold, the devices start to raise their output power. The recommended value of this parameter is 1% to 2% of Pn.
Pn is the total rated output power of devices and can be queried on the overview page of the SmartLogger.
Fail-safe power threshold Device output power percentage is controlled by the SmartLogger when communication between the SmartLogger and the meter is abnormal.
Switch-off with 0% power limit Set whether the DO port is allowed to control switch-off.
Switch-off control port Set this parameter to the DO port that controls switch-off.
Switch-on control port Set this parameter to the DO port that controls switch-on.
Switch-off state feedback port Set this parameter to the DI port that reports the switch-off status.
Switch-on state feedback port Set this parameter to the DI port that reports the switch-on status.
Note [1]: If cables are reversely connected to the meter and the NMS can correctly display the real-time data of the meter, it is considered that the NMS supports reverse connection. That is, the NMS reverses the active power, reactive power, power factor, phase A active power, phase B active power, and phase C active power, replaces the total positive active energy and total negative active energy with each other, and replaces the total positive reactive power and total negative reactive power with each other.
Note [2]: Meter access direction is set in the meter running parameters.
- Positive: default value.
- Verify that the SmartLogger can remotely turn on and off circuit breakers in scenarios with circuit breakers.
- Click Switch off and check that the circuit breaker is switched off properly.
- Click Switch on and check that the circuit breaker is switched on properly.
Remote Output Control
Remote output control is not supported in energy storage scenarios (excluding distributed energy storage scenarios). When you attempt to set the mode to Remote output control, a failure message will be returned. If Remote output control has been set before plant expansion by adding ESSs, you need to set Active power control mode to other values.
- Synchronize the clock source of the server.
Path
Parameter
Description
Clock source Set this parameter to NTP.
Synchronization server Set this parameter to the IP address or domain name of the server for time synchronization.
NTP synchronization test You can click this button to check the time synchronization status.
- Set remote output control parameters.
Path
Parameter
Description
Active power control mode Set this parameter to Remote output control.
Control area Set this parameter to the area where the remote output control function is used. To enable the function in some areas, the license needs to be imported and enabled.
Output control duration Set this parameter to the time required for the device to change its output power from 0% to 100% or from 100% to 0%.
PV plant ID Set this parameter to the PV plant ID.
Remote output control server Set this parameter to the IP address or domain name of the server.
Enable certificate Determine whether to import and enable a certificate based on the actual situation.
Selling surplus power - Disable: The inverter output power is controlled by the SmartLogger according to the remote output control command issued by the power company. The output power of the PV plant cannot exceed the active power scheduling value issued by the power company.
- Enable: When the load power is less than or equal to the remote output control command, the inverter output power is determined according to the remote output control command. Power can be bought or sold at the grid-connection point. When the load power is greater than the remote output control command, the SmartLogger automatically adjusts the inverter output power to achieve zero-power at the grid-connection point, that is, power cannot be sold at the grid-connection point.
PV module capacity Set this parameter to the capacity of PV modules connected to the plant.
Plant AC capacity Set this parameter to the AC capacity of the limited feed-in power from the plant.
- If the connection between the SmartLogger and the server is abnormal, obtain the output control file in .data format from the website of the power company and import the file.
- After the SmartLogger connects to the server, you can export the relevant file.