Performance Index Tuning based on ZN Method Tuning Based on LMI Method ISE 43.55 (Tank 1) 65.20 (Tank 2) 27.81 (Tank 1) 17.81 (Tank 2) IAE 65.599 (Tank 1) 59.33 (Tank 2) 62.82 (Tank 1) 43.22 (Tank 2)

Table 2: Response analysis by different performance index.