Three-phase power flow calculations using direct Z BUS method for large-scale unbalanced distribution networks

Nien-Che Yang

Three-phase power flow calculations using direct Z _BUS method for large-scale unbalanced distribution networks

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Author(s): Nien-Che Yang ¹
- Affiliations: 1: Department of Electrical Engineering, and Innovation Center for Big Data and Digital Convergence, Yuan Ze University, 135 Yuan-Tung Road, Chung-Li, Taoyuan 32003, Taiwan
Source: Volume 10, Issue 4, 10 March 2016, p. 1048 – 1055
DOI: 10.1049/iet-gtd.2015.0822 , Print ISSN 1751-8687, Online ISSN 1751-8695

Received 13/02/2015, Accepted 07/10/2015, Revised 01/09/2015, Published 10/03/2016

In this study, a three-phase power flow solution method using graph theory, injection current, and sparse matrix techniques for large-scale unbalanced distribution networks is proposed. In the bus frame of reference, a direct iterative method is adopted. To integrate the electric characteristics of transformers and step voltage regulators into the proposed method, the existing component models are modified by equivalent injected currents. To validate the performance and effectiveness of the proposed method, four three-phase IEEE test systems and random test systems are used for comparison purposes. As the size of the network increases, the proposed direct Z _BUS method drastically shows its superiority over the other methods. The results reveal that the proposed method has good potential for improving the computational efficiency of optimal planning and design as well as real-time power dispatch applications in large-scale distribution systems.

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Three-phase power flow calculations using direct Z _BUS method for large-scale unbalanced distribution networks

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