Optimization of the steady voltage profile in distribution systems by coordinating the controls of distributed generations

2012 ◽  
Author(s):  
Yujun He ◽  
Marc Petit ◽  
Philippe Dessante
Keyword(s):  
Distribution Systems ◽  
Voltage Profile ◽  
Distributed Generations

scholarly journals Optimal Allocation of DGs with network reconfiguration using Improved Spotted Hyena Algorithm

2020 ◽  
Vol 15 ◽  
Keyword(s):  
Distribution Systems ◽  
Optimal Allocation ◽  
Fitness Function ◽  
Spotted Hyena ◽  
Voltage Profile ◽  
Distributed Generations ◽  
System Reconfiguration ◽  
Optimal Subset ◽  
Spotted Hyenas ◽  
The Given

Several studies of distribution network enhancement focused only on the optimization of either the integration of distributed generations (DGs) or system reconfiguration (SRC). However, very few researches have been exerted for incorporating both where this merge represents further complexities in searching for maximizing their benefits and minimizing the investments. This paper sheds light on the simultaneous allocation of DGs with SRC in distribution systems. It suggests a multi-objective formulation considering multiple objectives: active power loss minimization, total cost reduction, and voltage profile improvement. For solving this problem, an improved spotted hyena optimizer (ISHO) is developed. The SHO demonstrates a good feature in finding the optimal or nearly optimal subset with simple structure to minimize the given fitness function. To support the exploration characteristics of the proposed ISHO, it augments a switch strategy in the updating mechanism of the spotted hyena’s positions and random positions are generated instead of the violated spotted hyenas. The simulations are investigated for the integration of a single and multiple DGs with SRC for two standard systems, which are IEEE 33 and 69-node test systems. The obtained results prove the efficiency of the suggested method for the network manager to find the optimal DGs allocation with SRC considering multiple criteria. These results are compared with previous literatures to demonstrate the effectiveness of the proposed algorithm.

scholarly journals Index-based optimal DG allocation for voltage quality improvement in an unbalanced network

2021 ◽  
Vol 6 (2) ◽  
pp. 090-103
Author(s):  
Ahmadreza Eslami
Keyword(s):  
Distribution Systems ◽  
Intermediate Stage ◽  
Voltage Regulation ◽  
Voltage Profile ◽  
Distributed Generations ◽  
Voltage Unbalance ◽  
Voltage Variation ◽  
Voltage Quality ◽  
Three Phase ◽  
Unbalanced Network

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.

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