Power Plant Controller (PPC) is an intelligent vendor-independent system for dynamic PV power plant control and grid code compliance, customizable to satisfy any grid requirement while ensuring interoperability with plant SCADA systems. The PPC controls the output of the PV plant at the Point of Common Coupling, using the plant inverters, meters, statcom, capacitors, breakers and peripheral controllers - providing near real-time capabilities for plant disconnection or generation stop, active and reactive power control, as well as power ramp rate control.
The PPC offers a variety of control and monitoring capabilities to the grid and plant operator, including intelligent closed-loop control of active and reactive power, circuit breaker control, as well as monitoring of electrical, meteorological quantities, breakers and power control modes and states. Interoperability is ensured for a wide variety of inverters and meters. Customization for new grid code requirements is implemented upon request. Communication with grid operator systems is performed using a number of standard IP or RS-485 protocols (IEC 60870-5-101/104, DNP3, Modbus) as well as digital or analogue interfaces.
A PPC that is integrated with a networked PV monitoring system can cover multiple architectures: with fiber-optic networks for connection to the plant subsystems or standard Ethernet with IP or RS485-based inverter connectivity. By utilizing peripheral substation units (PSSU) acting as protocol gateways, the PPC is able to satisfy grid code requirements even with low bandwidth networks.