Facts Controllers In The Multi-machine Power System Interaction

Rising energy costs and a greater sensitivity to environment impact of a new transmission lines necessitated the search and application of new controllers to minimize losses and maximize the stable power-transmission capacity of existing lines. Flexible AC Transmission System (FACTS) technology, based on the application of a variety of new power-electronic controllers for both active and reactive power on selected lines, is becoming an integral component of modern power transmission systems.The objective of this dissertation is to analyze the interactions among FACTS controllers in multi-machine power system. The contents in the paper include the following aspects:1) The dissertation starts with an introductory review about FACTS. And Chapter 1 also contains the general introduction and benefits of different types of FACTS devices.2) In Chapter 2, an augmented Phillips-Heffron model of a multi-machine power system installed with multi-TCSC is built up; and an augmented Phillips-Heffron model of a multi-machine power system installed with SVC and TCSC is built up in Chapter 3.3) The possibility of the negative interactions between two TCSC devices operating at the same electrical area in a 4-machine 11-bus power system is analyzed using the RGA method in Chapter 4, and the time-domain simulation results demonstrate the analyzed results.4) The possibility of the negative interactions between SVC and TCSC devices in a New England 10-machine 39-bus power system is analyzed by using the RGA method in Chapter 5, and it is investigated by non-linear simulation method.