Open-loop control

The SMA products are equipped with digital inputs to which a ripple control receiver can be connected, for example. When the inverters receive setpoints in the form of digital signals via the ripple control receiver, open-loop control is used. The product reacts to the setpoints and implements them.

During open-loop control operations, the product does however not check whether the specified setpoint also matches the actual value, in other words the current value at the point of interconnection. There is therefore no actual value feedback to be processed further. It is not necessary to measure the feed-in power at the point of interconnection, and therefore systems with open-loop control do not require an energy meter.

Advantages:

• If the grid operator specifies setpoints and directly transmits these to the inverter as digital signals via a ripple control receiver, the inverter implements these specifications. If the product is used as system manager, it can run subordinate inverters using open-loop control and can transmit the specifications to the subordinate inverters.

• "Open-loop control" is a standard function.

Disadvantages:

• Open-loop control does not consider the possible self-consumption. Increased self-consumption is only possible with closed-loop control.