Piece-wise linear droop control for load sharing in low voltage DC distribution grid
Authors:
- 1 December 2017
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- p. 1-6
Abstract
This paper presents load current sharing of parallel-connected sources in a low-voltage dc distribution grid. Droop control is a common technique for load current sharing in dc distribution grids. The main drawback of the conventional droop method, which has one droop value, is poor current sharing due to the resistance of distribution cables. These resistances create different voltage drops which limits the current sharing for each of the sources. This paper introduces a piece-wise linear droop control to improve current sharing during heavy load demand and decrease current sharing at light load for sources which are far away from the load. This piece-wise linear droop control does not need communications to improve current sharing and is decentralized. The number of segments of the droop curve depend on the size of converters and the requirement to minimize system oscillations. Detailed analysis and design procedures are provided in this paper. Simulations to verify the piece-wise droop concept are presented.Keywords
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