The function of PID controller in the pressurizer water level control system

The PID controller is simple, easy adjustment, and convenient use, controlling is made from such three links as proportion, integral, differential. LabVIEW is a virtual instrument platform software, it has a simple graphical programming environment and powerful function. Pressurizer water level control system controls the water level by using two PIs. The proportion link reflects the valve position signal, reduces the deviation; the integral link eliminates the steady state error by increasing the output, improving indiscrimination degree. (authors)