Abstract
Although the distributed generator (DG) placement and distribution network (DN) reconfiguration techniques contribute to reduce power loss, obviously the former is a design problem which is used for a long-term purpose while the latter is an operational problem which is used for a short-term purpose. In this situation, the optimal value of the position and capacity of DGs is a value which must be not affected by changing the operational configuration due to easy changes in the status of switches compared with changes in the installed location of DG. This paper demonstrates a methodology for choosing the position and size of DGs on the DN that takes into account re-switching the status of switches on distribution of the DN to reduce power losses. The proposed method is based on the runner root algorithm (RRA) which separates the problem into two states. In State-I, RRA is used to optimize the position and size of DGs on closed-loop distribution networks which is a mesh shape topology and power is delivered through more than one line. In State-II, RRA is used to reconfigure the DN after placing the DGs to find the open-loop distribution network which is a tree shape topology and power is only delivered through one line. The calculation results in DN systems with 33 nodes and 69 nodes, showing that the proposed method is capable of solving the problem of the optimal position and size of DGs considering distribution network reconfiguration.
Highlights
The distribution system has a radial or mesh configuration but operates in radial state
The loss reduction in percentage for the proposed method based on runner root algorithm (RRA) is 0.05 higher than the result gained reduction in percentage for the proposed method based on RRA is 0.05 higher than the result gained by cuckoo search algorithm (CSA) and 0.57 higher than the result gained by adaptive weighted improved discrete particle swarm optimization (AWIDPSO), which is the method of solving the by CSA and 0.57 higher than the result gained by AWIDPSO, which is the method of solving the reconfiguration and simultaneous position and capacity of distributed generator (DG)
The results showed that in the nodes network system, the percentage loss reduction for RRA method is 1.02 higher than the result nodes network system, the percentage loss reduction for RRA method is 1.02 higher than the result gained by CSA results and these results to the same with the results by the fireworks algorithm (FWA)
Summary
The distribution system has a radial or mesh configuration but operates in radial state. In [3,4,5,6,7,8,9,10,11,12], the authors only focused on optimizing the position and capacity of DGs on the DN without considering configuration of the DN which is an effective technique for reduction power loss in the DN system This technique called distribution network reconfiguration (DNR) is performed by changing the closed/open status of sectionalizing and tie switches while respecting system constraints [17].
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