Loading...

nvestigating and Using of an Optimal Controller for Parallel 3-Phase UPS

Nazaripouya, Hamid Reza | 2009

795 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40585 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Mokhtari, Hossein
  7. Abstract:
  8. In this thesis first of all the different approaches of control and parallel of multi-modular inverter system were investigated. These methods have been categorized and examined separately, and they were compared with each other in terms of quality and quantity. Afterwards, Active current sharing technique due to its high reliability was selected as the fundamental control approach. Among different ways for active current sharing, Avarage load sharing was chosen for its acceptable stability compared with other method. Approaching this goal, for the first time optimal control strategy and LQR method was proposed to parallel 3-phase inverters.At first, the problem was edited to be compatible and solvable with LQR equation. Using dq technique, 3-phase inverters were paralleled and controlled.Then the proposed method was improved within several stages as if the supplying of balance and unbalance linear load in spite of sudden changing became possible. Therefore, both current sharing and voltage tracking are obtained. In addition, the smallest input energy, simplicity in control circuit, Low output Voltage THD, low circulating current, robustness to the change in the number of inverters and the possibility of parallel different inverters with different capacities are the other advantages of suggested method. The result of the simulation verifies the high performance of the proposed method
  9. Keywords:
  10. Optimal Control ; Uninterruptible Power Supplies ; Inverter ; Parallel Operation ; OPTIMAL CONTROL

 Digital Object List

 Bookmark