This research study focuses on improving the performance of AC voltage regulators using a variety of control methodologies. Three main control systems are investigated: Phase Angle Control (PAC), Pulse Width Modulation (PWM), and Integral Cycle Control (ICC), also known as On-Off Cycle Control. Currently, Phase Angle Control and PWM methods are widely used but generate a large number of harmonics, resulting in poor circuit performance. The paper describes the design and modeling of a thyristor-based AC voltage controller that uses Integral Cycle Control, Pulse Width Modulation, and Phase Angle Control approaches. Simulation tasks were carried out using three software platforms: MATLAB, Multisim, and PSCAD. The use of the FFT block in the PSCAD software permitted the extraction of the direct harmonic spectrum, which improved the analysis process.