Flexible AC Transmission Systems Modelling in Optimal Power Flows Using Newton's Method

Ambriz Perez, Hugo (1998) Flexible AC Transmission Systems Modelling in Optimal Power Flows Using Newton's Method. PhD thesis, University of Glasgow.

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This research project is related to the modelling of the new generation of power electronics-based plant components presently emerging as a result of the recently developed concept of Flexible AC Transmission Systems (FACTS). These new power network technologies represent the application of power electronics in AC power systems to provide adaptive power flow control under both steady state and emergency conditions. These technologies may have a profound impact on the electricity supply industry world wide over the next decade. The economical and operational benefits afforded by this form of electronic control are many, however, this is at the expense of a sharp increase in network planning and operational complexity. As the various controls present in the network interact with each other, good power system tools are required in order to carry out power system studies. In a secure operating environment, the operation of these devices would have to be well co-ordinated and advanced computational tools, such as Optimal Power Flows are required in order to aid planning and control engineers to achieve this task. This research addresses the issue of FACTS models suitable for steady state solutions of large-scale power networks. Considerable progress has been made in Load Flow studies which include realistic FACTS device models. However, very little work has been done in tackling the more complex issue of OFF solutions where FACTS devices are included. Nevertheless, it is this application tool that needs to be well developed if the value of the FACTS technology is to be demonstrated from the power system economics and security viewpoints. The aim of this research work is to develop FACTS device models suitable for large-scale Optimal Power Flow studies. The models represent the various steady state operating control features of the FACTS devices using generalised nodal admittances. Models are developed for the following FACTS devices: Phase-Shifting Transformer, Load Tap-Changing Transformer, Static Var Compensator, Thyristor Controlled Series Capacitor, Interphase Power Controller, Unified Power Flow Controller and High Voltage DC link. The FACTS models are integrated into an efficient Newton Optimal Power Flow program. The robustness of the convergence of the various steady-state FACTS device models has been thoroughly investigated. The newly developed FACTS OPF* computer program has been used to study several electrical power networks, some of the them corresponding to test networks available in the open literature, and a number of other real-life electric networks where hundreds of variables are to be optimised.

Item Type: Thesis (PhD)
Qualification Level: Doctoral
Additional Information: Adviser: Enrique Acha
Keywords: Electrical engineering
Date of Award: 1998
Depositing User: Enlighten Team
Unique ID: glathesis:1998-75947
Copyright: Copyright of this thesis is held by the author.
Date Deposited: 19 Nov 2019 17:13
Last Modified: 19 Nov 2019 17:13
URI: https://theses.gla.ac.uk/id/eprint/75947

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