Controllers For A VSC-HVDC Link Connected To A Weak AC System

Abstract

In this paper, the interconnection of a strong AC system to a weak AC system by using a Voltage Source Converter (VSC) based High Voltage DC (HVDC) transmission system is investigated. In this work, the weak AC system considered is an island system comprised of synchronous generators and passive load. Analysis is carried out for UPF load and inductive load. The ac filter requirement to achieve the required response for UPF and inductive load is carried out. For efficient functioning of the system considered, proper designing of the controllers is an important factor. The controller parameters are designed using Modulus Optimum technique and Symmetric optimum method. The performance analysis of VSC-HVDC is carried out for power transmission in the DC link for load variation in the island system. Simulations are carried out in MATLAB/ Simulink / Sim Power Systems and the results are presented. Keywords: Voltage Source Converter; PI controllers parameters; VSC-HVDC; Modulus optimum; Symmetric optimum; weak AC system; island system; Power order