Setting Export Limitation Parameters

When the PV and energy storage plant generates power for self-consumption, countercurrent may feed into the power grid if the loads cannot consume all the power. In this case, you can set the export limitation parameters on the WebUI to prevent countercurrent.

• Scenario without a circuit breaker: The reverse current feeding into the power grid can be eliminated by sending a command from the SmartLogger to adjust the inverter/Smart PCS output power.

Figure 6-74 Network diagram (without a circuit breaker)

• Scenario with a circuit breaker: When the reverse current feeding into the power grid cannot be eliminated by sending a command from the SmartLogger to adjust the inverter or Smart PCS output power, and the Maximum protection time is exceeded, the SmartLogger drives the relay to switch off the circuit breaker by controlling the DO port. When the DI port detects that the circuit breaker is open, the DO port and relay on the SmartLogger will be switched off, and the SmartLogger will restore to the initial state.

Connect the DO ports in series to the 12 V power supply loop of the relay coils. You are advised to use the 12 V power output port on the SmartLogger to power the relay coils. You can also prepare a 12 V power supply.

Figure 6-75 Network diagram (with a circuit breaker)

In the scenario with a circuit breaker, place the power supply of the SmartLogger before the circuit breaker to avoid the SmartLogger power-off after the DO switches off the circuit breaker.