Abstract
In actual multivariable control systems, controlled variables interact each other. In this case one compensation for a control loop exerts harmful influence upon another control loop through the interaction. This paper presents a noninteracting PID control for a fluid temperature and liquid level interacting system. First, a precompensator is designed to remove the interaction of the multivariable control system using the inverse Nyquist array method. Further, the integrator decoupled system with state feedback is designed in the time domain. Then the design of the control system for the interacting system results in the individual compensation for the single loop PID control system. The experimental results showed the effectiveness of the precompensator designed by the inverse Nyquist array and the integrator decoupled system for removing the interaction.
