On-line network reconfiguration for loss reduction in distribution networks with distributed generation

This paper proposes the Symbiotic Organism Search (SOS) algorithm to find the optimal network configuration and the placement of distributed generation (DG) units that minimize the real power loss in radial distribution networks. The proposed algorithm simulates symbiotic relationships such as mutualism, commensalism, and parasitism for solving the optimization problems. In the optimization process, the reconfiguration problem produces a large number of infeasible network configurations. To reduce these infeasible individuals and ensure the radial topology of the network, the graph theory was applied during the power flow. The implementation of the proposed SOS algorithm was carried out on 33-bus, 69-bus, 84-bus, and 119-bus distribution networks considering seven different scenarios. Simulation results and performance comparison with other optimization methods showed that the SOS-based approach was very effective in solving the network reconfiguration and DG placement problems, especially for complex and large-scale distribution networks.

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Optimal siting and sizing of distributed generation accompanied by reconfiguration of distribution networks for maximum loss reduction by using a new UVDA-based heuristic method

International Journal of Electrical Power & Energy Systems ◽

10.1016/j.ijepes.2015.11.039 ◽

2016 ◽

Vol 77 ◽

pp. 360-371 ◽

Cited By ~ 58

Author(s):

A. Bayat ◽

A. Bagheri ◽

R. Noroozian

Keyword(s):

Distributed Generation ◽

Heuristic Method ◽

Distribution Networks ◽

Loss Reduction ◽

Maximum Loss

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DISTRIBUTED GENERATION IMPACT ON DISTRIBUTION NETWORKS: A REVIEW

International Journal of Electronics and Electical Engineering ◽

10.47893/ijeee.2014.1096 ◽

2014 ◽

pp. 190-194

Author(s):

GOPIYA NAIK. S ◽

D. K. KHATOD ◽

M. P. SHARMA

Keyword(s):

Distributed Generation ◽

Power Distribution ◽

Distribution System ◽

Power Flow ◽

Distribution Networks ◽

Loss Reduction ◽

Power Distribution System ◽

Power Loss Reduction ◽

Planning Methods ◽

Voltage Support

The concept of traditional distribution networks with unidirectional power flow is weakening due to large penetration of Distributed Generation (DG). The penetration of DG may impact the operation of a distribution network in both beneficial and detrimental ways. Some of the positive impacts of DG are voltage support, power loss reduction, support of ancillary services and improved reliability, whereas negative ones include protection coordination, dynamic stability and islanding. Therefore, proper planning methods that evaluate the composite impacts, i.e. technical, economical and environmental impacts of DG integration to existing distribution networks are very much essential. This paper presents a critical review of various impacts of DG on power distribution system. For ease of reference and to facilitate better understanding this literature is categorized and discussed under five major headings.

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Optimal Network Reconfiguration in Active Distribution Networks with Soft Open Points and Distributed Generation

Energies ◽

10.3390/en12214172 ◽

2019 ◽

Vol 12 (21) ◽

pp. 4172 ◽

Cited By ~ 18

Author(s):

Ibrahim Diaaeldin ◽

Shady Abdel Aleem ◽

Ahmed El-Rafei ◽

Almoataz Abdelaziz ◽

Ahmed F. Zobaa

Keyword(s):

Distributed Generation ◽

Distribution System ◽

Distribution Systems ◽

Search Algorithm ◽

Distribution Networks ◽

Mixed Integer ◽

Network Reconfiguration ◽

Efficient Manner ◽

Optimal Network ◽

Network Losses

In this study, we allocated soft open points (SOPs) and distributed generation (DG) units simultaneously with and without network reconfiguration (NR), and investigate the contribution of SOP losses to the total active losses, as well as the effect of increasing the number of SOPs connected to distribution systems under different loading conditions. A recent meta-heuristic optimization algorithm called the discrete-continuous hyper-spherical search algorithm is used to solve the mixed-integer nonlinear problem of SOPs and DGs allocation, along with new NR methodology to obtain radial configurations in an efficient manner without the possibility of getting trapped in local minima. Further, multi-scenario studies are conducted on an IEEE 33-node balanced benchmark distribution system and an 83-node balanced distribution system from a power company in Taiwan. The contributions of SOP losses to the total active losses, as well as the effect of increasing the number of SOPs connected to the system, are investigated to determine the real benefits gained from their allocation. It was clear from the results obtained that simultaneous NR, SOP, and DG allocation into a distribution system creates a hybrid configuration that merges the benefits offered by radial distribution systems and mitigates drawbacks related to losses, power quality, and voltage violations, while offering a far more efficient and optimal network operation. Also, it was found that the contribution of the internal loss of SOPs to the total loss for different numbers of installed SOPs is not dependent on the number of SOPs and that loss minimization is not always guaranteed by installing more SOPs or DGs along with NR. One of the findings of the paper demonstrates that NR with optimizing tie-lines could reduce active losses considerably. The results obtained also validate, with proper justifications, that SOPs installed for the management of constraints in LV feeders could further reduce losses and efficiently address issues related to voltage violations and network losses.

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