Technical Communique: PI Tuning in Terms of Gain and Phase Margins

摘要: In this paper, a simple PI controller design method is proposed which can achieve user-specified gain and phase margins if they are suitable, or otherwise the automatically adjusted alternatives for performance enhancement. Unlike reduced-order model-based tuning methods, exact margins, once specified adjusted, be accomplished regardless of process order damping nature. The response closed-loop system using hence more predictable than those methods when specifications given in margins. based on finding intersections between two graphs that plotted frequency process. achieved found, each intersection corresponds to one solution. Suggestions provided how modify achieving satisfactory responses cases where there no solution met but poor result. Simulation examples show usefulness method.