Abstract
Voltage quality is a one of the major concerns in distribution systems. Distributed Generations (DGs) have the potential to improve voltage quality, if optimally planned and operated. Considering the problem of DG siting and sizing, this paper aims at integrating technical factors, particularly voltage quality, in planning of DGs. Hence, a methodology is proposed which optimizes voltage quality in the presence of DGs and can be used as one of the objectives in a multi-objective problem or as an intermediate stage in usual DG planning. Modified voltage quality indices are proposed which consider factors including voltage profile, voltage variation due to DG disconnection, voltage regulation and voltage unbalance. The indices are defined in such a manner suitable for three-phase unbalanced networks. The system voltage quality is assessed by a new comprehensive voltage quality index. By applying this index, the DGs locating and penetration problem is formulated to improve system voltage quality. The method is tested on IEEE 13-bus feeder which is an inherently unbalanced network.
Highlights
Distribution networks are facing significant technical constraints and uncertainties due to the integration of uncertain generations such as solar and wind and modern sensitive loads
Voltage quality improvement can find its place in distributed generations (DGs) planning programs either as an intermediate stage or as one of the objectives in multi-objective planning programs
The system voltage quality in the presence of DG was evaluated and a methodology was proposed which could be used as an intermediate stage in DG planning programs or as the objective function of DG planning in systems with voltage quality priorities that are system with valuable and high-sensitive loads
Summary
Distribution networks are facing significant technical constraints and uncertainties due to the integration of uncertain generations such as solar and wind and modern sensitive loads. Yammani et al [16] proposed a hybrid optimization algorithm for optimal placement and sizing of the DGs. Bus voltage profile improvement, line flow capacity, and active and reactive power loss minimization were considered as multi-objectives to be optimized under distribution load enhancement. Ochoa et al [19] presented a multi-objective performance index for distribution network with DG which considered a wide range of technical issues such as voltage, capacity of conductors and power loss. This index could be used in planning DGs from technical point of view.
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