Loading...

An Improved Voltage and Frequency Droop Control Method for Microgrids having Inverter Based Resources, Realizing the Effect of Lines R/X

Esmaeili Atrabi, Hamed | 2016

931 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49200 (05)
  4. University: Sharif University of Technology
  5. Department: Electrical Engineering
  6. Advisor(s): Vakilian, Mehdi
  7. Abstract:
  8. The centralized and decentralized control approaches are the most effective control approaches to be applied in micro grids. However, practically to rerduce the cost and improve the reliability, decentralized control is usually employed. Initially, this thesis discusses the components and dynamic model of the micro grid in order to evaluate the stability. Then, it introduces the decentralized control methods which can be used in a micro grid. In the next step, a sample micro gird is studied (with high ratio of lines R/X). This microgrid has three DG plants having DC voltage sources, inverter, and LCL filter. The performance of AVR controls is evaluated by combining the PQ and droop control methods to preserve the stability and a suitable power sharing. Based on previous works, a new method has been presented to control the micro grid in the following scenarios: operation of micro grid isolated from main grid, under switching on and off of large active and reactive loads. In the proposed method of this work, the micro grid power equations are linearized around the stable operating point in the micro grid and also some reformations are applied in droop equations to account for magnitude of lines R/X ratio, in power sharing. These result in an improvement in frequency and voltage characteristics of the micro grid
  9. Keywords:
  10. Microgrid ; Dynamic Model ; Droop Control ; Inverter Based Distributed Generation ; Active Power Control ; Reactive Power Control ; Power Split ; Decentralized Control Strategy ; Power Function Linearzation

 Digital Object List

 Bookmark

No TOC