Nice Explanation and thanks for your time Tiago Davi Curi Busarello

https://ieeexplore.ieee.org/document/7478941

thanks Myasar Alattar

Yes, it is possible to control the d-q component of GCCs using PR. The most important point is that in which loop PR is to be implemented. It can be a voltage control or a current control loop or both. My suggestion is to use PR in the current control loop. It is because PR controller reduces the dc-offset and performs better when the reference signal is ac in nature. The other advantage of using the PR is for selective harmonic compensation. The proper selection of bandwidth reduces the lower order harmonic components from the grid current. As a result, the overall grid current THD also reduces.

Yes, it is possible to control the dq component of the three-phase grid-connected PV system using Proportional Resonant control. Specifically, d component is used to regulate the active power and q axis component is used to regulate the reactive power component. However, as per the question, it is understood that reasher want to know about the solar pv power plant power flow study. As we know, the power generation is varying in naturr according to the irradiance condition. Therefore, through out the day, the power generation is not constant and contains more auxilarry component, by which the power quality of the system is badly affected. To circumvent the above problem, linear or nonlinear controolers are suggested. One of them is PR controller. For eliminating high order signals from the d axis component PR controller can be used and eliminate the harmonics. Similarly, for reactive power control, q axis component is controlled through PR controller and reagulate the highfreequency component.

Yes, it is possible.