LQ-PID Control; Combined method; Loop-Shaping; Target function
KOREAN INST ELECTR ENG
JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY, v. 10, no. 3, Page. 1244-1254
This paper proposes a new method for tuning a linear quadratic 7 proportional integral derivative controller for second order systems to simultaneously meet the time and frequency domain design specifications. The suitable loop-shape of the controlled system and the desired step response are considered as specifications in the time and frequency domains, respectively. The weighting factors, Q and R of the LQ controller are determined by the algebraic Riccati equation with respect to the limiting behavior and target function matching. Numerical examples show the effectiveness of the proposed LQ-PID tuning method.