Good morning, I am trying to simulate a grid-forming inverter in a grid-connected microgrid. The inverter control comprises the nested inner voltage and current control loops, each with a PI controller, plus a conventional P/f ad Q/V conventional droop outer controller. I have barely set the controllers by trial and error but would like to study it in a more systematic way to improve said settings.
I am trying to develop a state space model to study the stability of the system. I am able to obtain the dynamic equations of the inverter but I fail to integrate the PI controllers in the model.
Could you please suggest some procedure or papers that could help me? Thanks in advance!
To integrate the PI controllers in the state space model of the grid-forming inverter, you can use the method of augmented state space, as I mentioned in my previous answer.
However, the tuning of the PI controller gains can be a challenging task, especially when you have nested inner control loops and an outer droop controller. Here are some suggestions that might help you:
As for papers that could help you, here are some suggestions:
- "A systematic approach for tuning PI controllers in power electronics" by J. Chen and R. Wang (IEEE Transactions on Power Electronics, 2014).
- "Robust and adaptive control of grid-connected inverters for renewable energy systems: a survey" by M. A. Mahmud, M. Negnevitsky, and X. Wang (Renewable and Sustainable Energy Reviews, 2017).
- "Model-based control of grid-forming inverters for microgrid applications" by G. R. Walker, G. Abad, and M. J. H. Sterling (IEEE Transactions on Power Electronics, 2019).
- "Optimal control of grid-forming inverters using model predictive control" by J. J. Guerrero, J. Matas, and M. Castilla (IEEE Transactions on Power Electronics, 2013).
I hope this helps you in your research!
Check this old 2-page document from the Electrical Engineering Department, University of Nottingham (UK)
- Badges
- Science topic
- Similar topics
- Heat