For design of coordinated control system in thermal power units

first order differential is mostly used. However

there is a heavy time-delay difficulty would be overcome by this function when it faced the realistic use for pattern recognition and differential tracking. In the present work

another differential tracking method is developed and compared with the conventional first order differential. The result shows that

the new differential tracking method has a good quality in both fast differential tracking and overcoming noise disturbing. Moreover

when the new method is adopted

the controlling quality of main parameters of the unit is improved dramatically.