Typical medium voltage distribution system topologies in China: A review and a comparison of reliability

Cheng, Lin; Chang, Yu‐Jung; Liu, Manjun; Feng, Huicheng; Wu, Qiang

doi:10.1109/pmaps.2014.6960595

Cited by 1 publication

(1 citation statement)

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“…Three-phase distribution networks are responsible for interfacing transmission and sub-transmission networks at high-to-medium-voltage substations with end users at medium-and low-voltage levels [1,2]. These grids are typically built with a radial configuration to minimize the cost of investment in conductors and to simplify the process of protective device coordination [3].…”

Section: Introductionmentioning

confidence: 99%

Operating Cost Reduction in Distribution Networks Based on the Optimal Phase-Swapping including the Costs of the Working Groups and Energy Losses

2021

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The problem of optimal phase-balancing in three-phase asymmetric distribution networks is addressed in this research from the point of view of combinatorial optimization using a master–slave optimization approach. The master stage employs an improved sine cosine algorithm (ISCA), which is entrusted with determining the load reconfiguration at each node. The slave stage evaluates the energy losses for each set of load connections provided by the master stage by implementing the triangular-based power flow method. The mathematical model that was solved using the ISCA is designed to minimize the annual operating costs of the three-phase network. These costs include the annual costs of the energy losses, considering daily active and reactive power curves, as well as the costs of the working groups tasked with the implementation of the phase-balancing plan at each node. The peak load scenario was evaluated for a 15-bus test system to demonstrate the effectiveness of the proposed ISCA in reducing the power loss (18.66%) compared with optimization methods such as genetic algorithm (18.64%), the classical sine cosine algorithm (18.42%), black-hole optimizer (18.38%), and vortex search algorithm (18.59%). The IEEE 37-bus system was employed to determine the annual total costs of the network before and after implementing the phase-balancing plan provided by the proposed ISCA. The annual operative costs were reduced by about 13% with respect to the benchmark case, with investments between USD 2100 and USD 2200 in phase-balancing activities developed by the working groups. In addition, the positive effects of implementing the phase-balancing plan were evidenced in the voltage performance of the IEEE 37-bus system by improving the voltage regulation with a maximum of 4% in the whole network from an initial regulation of 6.30%. All numerical validations were performed in the MATLAB programming environment.

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Section: Introductionmentioning

confidence: 99%