Quantitative process control theory based H-wPID controller design for boost converter

Abstract

Pulse width modulated (PWM) dc-dc boost type converter exhibits nonlinear characteristics due to switching phenomenon and is a non-minimum phase system. Due to the presence of a right half plane (RHP) zero in the control to output (c2o) transfer function; closed loop control becomes extremely difficult. Nonlinear control schemes provide flexibility and quick response to changes in the operating point of the system. The major drawback is the difficulties encountered in their practical implementation. PID based control structures are popular in the industry due to ease of implementation and simple structure. However, complex PID tuning methodologies, such as H-infinity and linear quadratic regulator (LQR), involving numerical optimization and arbitrary choice of weighting functions provides many obstacles in the development of an efficient controller for industrial purposes. This paper utilizes a quantitative process control theory (QPCT) based H-<» PID control scheme which provides a no weight, numerical optimization free approach with analytical tuning rules. Performance of the proposed controller is compared with two other popular control schemes existing in the literature. Regulatory and servo performance of the closed loop system is analyzed in MATLAB®/SIMULINK and the performance of the proposed controller is found to be satisfactory.