**Nomenclature**


#### **Appendix A. Parameters of Modular Multilevel Converter**




**Table A2.** Controller parameter.

#### **Appendix B. Simulation Results of MMC Based PV Plant at STC**

**Figure A1.** Simulation results for scenario 1 (**a**) Capacitor voltages for all the sub-modules in an arm of the MMC for all three phases. From the top, upper arm phase "a", upper arm phase "b", upper arm phase "c", lower arm phase "a", lower arm phase "b", and lower arm phase "c", respectively. (**b**) The upper and lower arm currents (*iuy* [*A*], *ily* [*A*]), output currents (*isy* [*A*]), circulating currents (*icy* [*A*] ∀ y = a, b, c), the active and reactive power injected to the grid (*P* [*kW*], *Q* [*kVAr*]) and the plot shown the voltages (*vsy* [*V*] ∀ y = a, b, c) at PCC and the phase currents (*isy* [*A*]) for 100 ms duration between 4.9 s to 5 s, ∀ y = a, b, c.

The simulation results under STC is presented. Figure A1 shows the sub-module capacitor voltages in each arm of the MMC. The voltage is retained at their respective MPP voltage at STC. Figure A1 shows the arm currents (*iuy* [*A*], *ily* [*A*]), the output phase currents (*isy* [*A*]), the insertion indexes (*nuy* ) for the upper arm in all the phases, the active and reactive power (*P* [*kW*], *Q* [*kVAr*]), along with the reference values and the voltages at PCC (*vsy* [*V*]) and output currents (*isy* [*A*]) for a 100 ms duration between 3.9 s to 4 s.
