Loading...

Using optimal controller to parallel three-phase 4-leg inverters with unbalance loads

Nazaripouya, H ; Sharif University of Technology | 2017

630 Viewed
  1. Type of Document: Article
  2. DOI: 10.1109/ICPEICES.2016.7853392
  3. Publisher: Institute of Electrical and Electronics Engineers Inc , 2017
  4. Abstract:
  5. In this paper; control and parallel operation of multi-modular 3-phase inverters are investigated. Active current sharing approach is selected as the fundamental control technique for parallel operation of inverters due to its high reliability. Among different methods for active current sharing; average load sharing is employed due to its acceptable stability. For this purpose; optimal control strategy and Linear Quadratic Regulator (LQR) method is proposed to parallel 3-phase 4-leg inverters. The system is modeled to be compatible and solvable with LQR equations. Using dq technique; 3-phase inverters are paralleled and controlled. The proposed method obtains both current sharing and voltage tracking and addresses supplying of balanced and unbalanced linear loads in spite of sudden changes. Other advantages of the suggested method include the smallest input energy; simplicity in control circuit; low output voltage Total Harmonic Distortion (THD); low circulating current; robustness to the change in the number of inverters and the possibility of parallel different inverters with different capacities. The results of the simulation verify the performance of the proposed method. © 2016 IEEE
  6. Keywords:
  7. Load Sharing ; LQR ; Optimal control ; Parallel inverters ; Unbalanced load ; UPS ; Electric inverters ; Intelligent control ; Optimal control systems ; Power electronics ; Uninterruptible power systems ; Active current sharing ; Linear quadratic regulator ; Optimal control strategy ; Optimal controls ; Parallel inverter ; Parallel operation of inverters ; Unbalanced loads ; Power control
  8. Source: 1st IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems, ICPEICES 2016, 4 July 2016 through 6 July 2016 ; 2017 ; 9781467385879 (ISBN)
  9. URL: https://ieeexplore.ieee.org/document/7853392