Generation Control in Small Isolated Power Systems

Title: Generation Control in Small Isolated Power Systems This thesis is concerned with the generation control in small isolated power systems consisting of inverter interfaced generation systems. First the components of an individual distributed generation system (DGS) as well as the corresponding control schemes for active and reactive power flow are discussed and implemented. Then the contribution of multiple DGS to meet the requirement of the loads in both grid-connected and island operations are discussed. Having evaluated the performance of each developed model such as voltage source inverter, PQ and PV controlled as well as reference DGS, the impact of voltage degradation on power load control in isolated systems is analyzed. Finally a new method for generation control in a small power system based on power sharing between multiple DGS with voltage degradation consideration as the last alternative for sustaining the system is proposed and implemented. e Acknowledgements • Prof. Göran Andersson and Dr. Jost Allmeling from ETH-Zürich. Thank you for introducing me to the world of Microgrids, proposing the idea of this project, and giving the opportunity to join the power systems laboratory of ETH. • Dr. Mehrdad Ghandhari form KTH-Sweden. Thank you very much for all your time, concern, support, and kind attention. Your helpful comments on this work were of great value to me. • Dr. Valery Knyazkin form KTH-Sweden. Special thanks for your time and interest in evaluating the quality of this thesis. for spending some of your valuable time at preparing comprehensive answers to my questions. I owe my sincere gratitude to you for sharing some of your precious experiences in the field of Microgrids. ETH. It was a great honor and privilege for me to be with you for 6 months. Thank you all for your kindness. my friends in Power System Laboratory of ETH. I have been privileged to share desperate and joyful moments of this work with both of you in the lab. Thank you very much.Iran. It all started with that report on reactive power concept more than 11 years ago! You put me on the track to do research in the field of power systems for which I sincerely thank you. You have always been the source of encourage ment for continuing my studies. I very much appreciate that. It has been a distinct privilege for me to work with you during those years in Niroo Research Institute (NRI), Tehran-Iran. …