Abstract: Present work deals with the combination of automatic generation control (AGC) with automatic voltage regulator control (AVR) and the implementation of PI, PID and fuzzy logic controller for two area system. The purpose of the AGC is for balancing the system’s total generation against system load and losses. If any mismatch between generation and demand occur the system frequency may deviate from preset value. Thus, high value of frequency deviation may lead to failure of the system. The role of AVR is to hold terminal voltage magnitude of the generator at a preset level. The interaction between frequency deviation and voltage deviation is analyzed and studied in this paper.