Loss minimization in the modified algorithm of load flow analysis in industrial power system

The research looks at an alternative technique of loss minimization using B-loss formula in solving load flow analysis. A modeling of electrical system elements is first developed. A literature review on the history and development of load flow analysis and loss minimization especially on the use of B-loss formula are delivered. A report on load flow in practice and loss minimization measures based on a utility visit to EnergyAustralia is given. An analysis on three types of industrial power systems is also discussed. A substantial study on EDSA was made to adapt the commercial load flow program and demonstrate voltage control methods to achieve loss minimization. The research thesis work focuses on the use of a load flow analysis program to calculate and minimize losses in large electrical power distribution system such as an industrial power system. A Matlab load flow analysis program has been developed successfully using modified polar Newton-Raphson algorithms based on bus admittance matrix Ybus and the use of B-loss coefficient method. Real power losses are calculated using Blosses coefficients for achieving loss minimization and the technique has been verified with the traditional I2R and/or differential power methods. Modified load flow algorithm is also implemented by applying voltage control methods using either a shunt capacitor or a load tap changing (LTC) transformer. Voltage level is improved whilst minimizing losses. Appropriate modeling of a capacitor and an LTC transformer have been developed proven. A network of a typical meshed secondary selective system of five bus has been chosen and used as the test case. Several case studies with different values of capacitance and tap settings of transformer have been conducted to determine minimum losses. Further sensitivity analysis is carried out by simulating a wide range of load power configurations and line and transformer resistances to verify the robustness of the proposed modified algorithms especially on the use of B-losses algorithm for the chosen network. Results showed that the proposed algorithms ,although less accurate than full I2R calculations, are robust and reliable to achieve loss minimization for various ranges of load and impedance configurations. There is confidence in applying the method to larger systems. This two-year thesis details novel contribution towards loss minimization in power systems by applying B-losses formula into a load flow program, expressing the system losses in terms of active power generations which allows coordination of transmission losses in scheduling output of each generating plant. This gives maximum economy for a given load and achieves loss minimization using voltage control methods. This technique is not possible using standard commercial load flow programs.

Grantor dc:publisher

UNSW, Sydney

Year dc:date

2002

Author dc:creator

• Lukman, Dedek

• Industrial power systems
• Commercial load flow
• Load flow analysis

Statement dc:rights

• open access
• CC BY-NC-ND 3.0
• free_to_read

Licence

• https://purl.org/coar/access_right/c_abf2
• https://creativecommons.org/licenses/by-nc-nd/3.0/au/

Language dc:language

EN

Identifier

https://doi.org/10.26190/unsworks/17830

OAI identifier oai:identifier

oai:unsworks.library.unsw.edu.au:1959.4/35453