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3 product overview, 1 system overview – SMA POWER PLANT CONTROLLER User Manual

Page 10

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3  Product Overview

SMA Solar Technology AG

10

PPC-BE-P7-en-13

Operating Manual

3 Product Overview

3.1 System Overview

The Power Plant Controller assumes the park management function in large PV systems. The PV system can combine both

central inverters and decentralized string inverters, which are monitored and controlled by Cluster Controllers.

Figure 1: Principle of signal transfer in a PV system with Power Plant Controller

In the Power Plant Controller, the setpoints for grid management services are received and compared with the values

measured at the point of interconnection. Based on this comparison, the Power Plant Controller calculates the required

output values and transmits these values to the central inverters and the Cluster Controllers or the Inverter Manager.
The Power Plant Controller can receive setpoints digitally, analog, and via Modbus protocol. The setpoints are

transmitted by the grid operator or by a higher-level SCADA system via Modbus protocol.
The measured values that the Power Plant Controller receives are measured at the point of interconnection, processed by

a network analyzer, and transmitted to the Power Plant Controller as analog values or via Modbus protocol.
Transmission of the output values from the Power Plant Controller to central inverters, Cluster Controllers and the

Inverter Manager takes place via Modbus protocol.