SOME INVESTIGATIONS ON CONTROL OF DISTRIBUTION STATIC COMPENSATOR

Abstract

This thesis presents work on power quality problems faced in power distribution system and ways to mitigate these problems. A three phase three wire distribution system is considered which incorporates Distribution Static Compensator (DSTATCOM) at the Point of Common Coupling (PCC). Different controls algorithms are developed verified for power factor correction and voltage regulation mode. The operation of DSTATCOM is verified in power factor correction and voltage regulation modes. The control is modeled such that DSTATCOM provides the total reactive power requirement of the load as well as mitigation of power quality problems where as the source meets only the active power requirement of the load. This thesis is presented in five chapters which include power quality issues and custom power devices used in distribution system. The second chapter presents literature review and two conventional control algorithms namely Power Balance Theory (PBT) and Instantaneous Reactive Power Theory (IRPT). Some new control techniques have been developed and presented in chapter 3 which include Linear Quadratic Regulator (LQR), Composite Observer and Proportional Resonant Controller (PR). Chapter 4 deals with the control of DSTATCOM under distorted supply mains. The last chapter discusses some modeling and design aspects of Wind connected Permanent Magnet Synchronous Generator.