Query about the 'Single-Phase Grid-Connected Solar Photovoltaic System' Document

Hi,

In the Document mentioned in the description, I wanted to understand how the saturation values inside the Current Control Loop had been calculated. Specifically, in the Id and Iq current control. Variable name is currentVoltMax = 722.08.

I am also adding the link to the simulink system.

Single-Phase Grid-Connected Solar Photovoltaic System

Answer 1

[Shishir Reddy]

Hi @Rainy

As per my understanding You are referring to the 'currentVoltMax = 722.08' parameter in the current control loop of the Single-Phase Grid-Connected PV System example. This value is used as a saturation limit for the PI controllers regulating the d-axis (Id) and q-axis (Iq) currents.

This saturation limit essentially defines the maximum voltage that the controller can output, ensuring that the modulation signal to the inverter stays within a valid range. If the controller tries to output a voltage beyond what the inverter can physically generate (based on the available DC bus voltage), it would cause clipping or distortion. So this limit helps to maintain stable and safe operation.

You can usually find this value defined or calculated in the model’s initialization script or data file. If you open the 'SinglePhaseGridSolarPVData' or model callbacks (like InitFcn), you may find how this value is set based on the system’s voltage levels.

I Hope this helps.