Dear all, I need to develop for my PhD Thesys the basic model of an islanded microgrid comprising renewable generation sources and storage systems. Would you kindly to provide me with some advice regarding the following issues:
- In my perception, starting of main motors may unbalance the islanded grid in case these are not driven by variable speed drivers due to current peaks. I am unsure on how to model the corresponding transients, I specifically mean sample times.
- Regarding generator sources I believe you may consider different models being different because of their corresponding degree of development that you can specify by assigning a numeric order to the model e.g we then would have order-3, order-5 and following generator models. In case my perception is correct would you kindly to recommend me which in your opinion is the most adequate generator model order and some related technical literature which I can consult.
- Are there similar models for motors? Where could I consult them?
- After this initial offline simulation stage I would face real-time simulation with HIL or another means. Does this approach involve any constraint or requirement that I should need to consider in this previous off-line simulation stage?
Please feel free to comment on all the above and also to provide any suggestion that in your opinion could help me with my work.
Thanks in advance! I appreciate all you kind help and support.
Some additional comments:
- I would like to focus on possible enhancements of MG primary control rather than on the performances of the storage system.
- Could anybody kindly suggest a standard where I could review the power quality requirements for an island microgrid and the related issues? namely admissible frequency/voltage limits, conditions for active/reactive power injection for V/f regulating purposes etc..
I do appreciate your kind support!
Some additional comments:
- I would like to focus on possible enhancements of MG primary control rather than on the performances of the storage system.
- Could anybody kindly suggest a standard where I could review the power quality requirements for an island microgrid and the related issues? namely admissible frequency/voltage limits, conditions for active/reactive power injection for V/f regulating purposes etc..
I do appreciate your kind support!
Excellent documentations with very useful examples are on official Mathworks site, https://www.mathworks.com, just use it. There are nice examples for power networks, generators and motor. Sample time depend on what you want to study. In your case, I supposed that is a millisecond range suitable for your work. You can try with discrete model with 5e-05 second or 10e-05 second. After a while, you will find most suitable sampling range. With that range, you will able to model any events in your grid. You a not sure how the whole system will respond with start of main motor. So, design the model and change the type of motor or control loop you will get in that software very nice data for analyzing. In Matlab Simulink there is detail model for synchronous generator (order-5 or more). Start with them.
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