Interaction Analysis And Research. Of Statcom And Svc Controllers

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 the two shunt FACTS devices, STATCOM and SVC, for voltage control on a transmission line. The contents in the paper include the following aspects:1) The dissertation starts with an introductory review about the problems encountered in modern power systems engineering mainly on transmission systems. And Chapter 1 also contains the general introduction and benefits of different types of FACTS devices.2) Chapter 2 outlines the principle of operation and functional operation of 2 different types of FACTS: SVC and STATCOM. In this chapter, mathematical model of a single machine infinite bus power system installed with STATCOM and SVC is derived.3) The possibility of the negative interactions among STATCOM controllers and SVC controller in this SMIB power system is analyzed by using the RGA method, and the time-domain simulation results demonstrate the analyzed results.4) A decentralized coordinated controller is designed to eliminate the negative interaction and stabilize the closed-loop power system. The detailed simulation results demonstrate the effectiveness of the proposed controller.