I have a grid connected 5KW system with 16 panels, with individual panel rating ranging from 36-40 V at 8 A connectedin series give approximately 500-600 V at 8 A. In times of power outage, the Inverter usually supplies power to the load. In absence of a battery unit how do we limit the excess power produced. We thought of using a buck converter to minimize production in such power outage scenarios, but using a buck converter for close to 2KW or 3KW is practically impossible and not cost effective.
I did think of using a voltage reference based power limit control, but the inverter's MPPT is not taking the reference votlage. The inverter in question is a commercial one made by Growatt solutions with an inbuilt MPPT control.
The grid connected inverters controls the output current from the inverter. So, you need only to set the reference current of the inverter to a smaller value.
For more information about the output power grid connected inverter please refer to paper in the link:Article Simulation and Implementation of Grid-connected Inverters,
The other solution could be implemented in the design phase where one divide the array into two equal parallel strings. In this way one can connect only one of the two strings to the input of the inverter when the load is reduced.
Best wishes
Srivatsan there are several ways to accomplish what you are asking. But first, how about a better explanation from you about your requirement, and you will find more answers coming your way. Your question is incomplete without your reasoning behind the question.
Using a buck converter will lead to more losses in terms of switching losses, therefore, as suggested by Mohamed Azab , setting the reference set point to a desired value should be a better solution..... you can also curtail your power output according to your requirements by switching off individual strings or something like that?
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