Investigation the Impact of Length Increase of Lines on the Dynamic Performance of Microgrids
Seyed Mehdi Baharizadeh 1, Seyed Mehdi Rezaean 2
1. Department of Electrical Engineering, Isfahan University of Technology, Isfahan, Iran
2. Department of Electrical and computer Engineering, Islamic azad University, khomeinishahr Branch, Isfahan, Iran
Abstract: This paper presents a new method to evaluate the effect of line length on the dynamic performance of the inverter based micro-grids (MG) by using eigenvalue based sensitivity approach. Due to the location of partial loads and generators, the MGs can experience increased line length. Line length could increase when micro-sources (MS) and loads either geographically or electrically are located far from each other in a micro-grid. In this paper, first the effect of line length increase is investigated analytically and then a small-signal model of a prototype micro-grid is derived and the eigenvalue sensitivity of the system is considered for line length effect analysis. The analysis shows that the dynamic performance can be deteriorated which could eventually lead to instability when the line length line increases. The analytical results are verified using linearized small-signal model of a prototype micro-grid. Time domain simulations are also used for the validation of results. Moreover, a method is proposed to improve the dynamic performance of the system in presence of line length increment.
[Baharizadeh SM, Rezaean SM. Investigation the Impact of Length Increase of Lines on the Dynamic Performance of Microgrids. Life Sci J 2013;10(1):621-627] (ISSN:1097-8135). http://www.lifesciencesite.com.100
Keywords: Microgrid; Small signal model; Distributed Generation; Droop characteristic. Full Text 100