STATCOM control for power system voltage control application教程.pdfVIP

IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 15, NO. 4, OCTOBER 2000 1311 STATCOM Control for Power System Voltage Control Applications Pranesh Rao, Student Member, IEEE, M. L. Crow, Senior Member, IEEE, and Zhiping Yang, Student Member, IEEE Abstract—A Static Compensator (StatCom) is a device that can provide reactive support to a bus. It consists of voltage sourced con- verters connected to an energy storage device on one side and to the power system on the other. In this paper, the conventional method of PI control is compared and contrasted with various feedback control strategies. A linear optimal control based on LQR control is shown to be superior in terms of response profile and control effort required. These methodologies are applied to an example power Fig. 1. Connection of a StatCom to a bus. system. Index Terms—Controller design, StatCom, voltage regulation. I. INTRODUCTION HE USE OF FACTS (flexible AC transmission system) Tdevices in a power system can potentially overcome limitations of the present mechanically controlled transmission systems. By facilitating bulk power transfers, these intercon- nected networks help minimize the need to enlarge power plants and enable neighboring utilities and regions to exchange power. The stature of FACTS devices within the bulk power system will continually increase as the industry moves toward a more competitive posture in which power is bought and sold Fig. 2. Equivalent circuit of StatCom. as a commodity. As power wheeling becomes increasingly prevalent, power electronic devices will be utilized more fre- quently to insure system reliabilit