i think grid connected system(smart grid) is more beneficial .Matlab simulation is best otherwise you can also work on the PScad

I would recommend you read this: FEASIBILITY AND SIMULATION OF A SOLAR PHOTOVOLTAIC INSTALLATION IN DC FOR STANDALONE SERVICES BUILDINGS, But I think the standalone systems are feasible in both as in rural and non-rural areas. And taking into account the control perspective the standalone is easier to control than the grid connected undoubtedly. I strongly suggest read the following paper: Analysis and assessment of an off-grid services building through the usage of a DC photovoltaic microgrid. Kind regards!

Standalone/autonomous systems will give you better options for your research. Grid connected networks are almost saturated.

In remote locations, stand-alone systems can be more cost-effective than extending a power line to the electricity grid .But these systems are also used by people who live near the grid and wish to obtain independence from the power provider or demonstrate a commitment to non-polluting energy sources. Successful stand-alone systems generally take advantage of a combination of techniques and technologies to generate reliable power, reduce costs, and minimize inconvenience. Some of these strategies include using fossil fuel or renewable hybrid systems and reducing the amount of electricity required to meet your needs. In addition to purchasing photovoltaic panels, a wind turbine, or a small hydropower system, you will need to invest in some additional equipment .

I developed my own model of PV and storage system and I have also used HOMER. You may find these reports helpful for your research:

Thesis Assessment of Renewable Energy Based Micro-Grids for Small Communities