Good morning, I refer to isolated microgrids e.g rural power systems. In these off-grid systems chances are that the starting of loads involving great in-rush currents can create power unbalances. Currently there are many applications e.g solar pumping or renevable powered reverse osmosis which incorporate inverters to drive said loads to minimise these undesirable effects by progressively start and operate them to limit the in-rush current . Still in certain areas other loads e.g dwell pumps may start in direct on line mode. Moreover inverters can create harmonics affecting the isolated grid specially in those case where costs constraint avoid the use of Low Harmonics inverters.
I would request you some advice on these issues and to recommend some related technical papers , thanks in advance.
Dear Juan Cabeza
Please take a look at these attachments paper
Best regards
http://integratedgrid.com/wp-content/uploads/2017/01/8a-Maitra-Microgrid-Design-Consideration.pdf
Article Simulation of Inrush Dynamics for Unbalanced Distribution Sy...
Article Mitigation of harmonics and unbalanced source voltage condit...
https://books.google.fr/books?id=T7OmDwAAQBAJ&pg=PA727&lpg=PA727&dq=microgrids+loads+involving+great+in-rush+currents+can+create+power+unbalanced.&source=bl&ots=t2oxFNHBSb&sig=ACfU3U1Ym2DFSYJNuM_EssIg3NvlhbJcpw&hl=ar&sa=X&ved=2ahUKEwiuo7mQnL_nAhXLyIUKHae6AWkQ6AEwAXoECAoQAQ#v=onepage&q=microgrids%20loads%20involving%20great%20in-rush%20currents%20can%20create%20power%20unbalanced.&f=false
Please check the load models given in power system stability and control by praba kandur. In addition to it type of load has impact on inverter operation, mostly in case of induction loads.
Dear Juan Cabeza
Please take a look at these attachments paper
Best regards
http://integratedgrid.com/wp-content/uploads/2017/01/8a-Maitra-Microgrid-Design-Consideration.pdf
Article Simulation of Inrush Dynamics for Unbalanced Distribution Sy...
Article Mitigation of harmonics and unbalanced source voltage condit...
https://books.google.fr/books?id=T7OmDwAAQBAJ&pg=PA727&lpg=PA727&dq=microgrids+loads+involving+great+in-rush+currents+can+create+power+unbalanced.&source=bl&ots=t2oxFNHBSb&sig=ACfU3U1Ym2DFSYJNuM_EssIg3NvlhbJcpw&hl=ar&sa=X&ved=2ahUKEwiuo7mQnL_nAhXLyIUKHae6AWkQ6AEwAXoECAoQAQ#v=onepage&q=microgrids%20loads%20involving%20great%20in-rush%20currents%20can%20create%20power%20unbalanced.&f=false
This is a common situation where the loads (even transients) on a network exceed the capacity of the network to supply the power. The only solution is as you state, to include electronics to start your motors gradually so that the total available power is never exceeded.
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