*4.4. Signals from Simulated Plant to Controller*

The controller receives the analog signals of the plant through the analog output channels of the RTDS. The controller receives PV voltage and current signals which are required for tracking MPP. Battery voltage is required for finding out the charging current reference and battery current signal is required for closed loop current control of the battery charger. Three phase grid voltage signals are required for the PLL and inverter side voltages are monitored for synchronization purposes. Three phase inverter currents are required for the closed loop current control of the PV inverter. Based on the start-stop commands received from the user interface panel, the controller gives the ON/OFF commands to the PV switch, grid switch and battery switches through the digital input channels of RTDS. Switch status outputs to the controller are given to the controller through the digital output channels of the RTDS.
