Modified IMC for Automatic Voltage Regulator via Order Reduction Techniques

This paper presents the design, application and analysis of low order modified internal model controller (M-IMC) for automatic voltage regulator (AVR). The drawback of traditional IMC (T-IMC) is the poor input and output disturbance rejection performances that play the key role in AVR for industrial applications. The performance of AVR with M-IMC is compared to T-IMC and ZN tuned PID controller. To the design of low order IMCs, the Routh approximation, improved pole clustering, and truncation methods are applied for the reduction of order of AVR system. The low order controllers are reduces the complexity and computational time of overall system.