PID Controller, PD ( Proportional Derivative), PI ( Proportional Integral)

Two Mode Control System

Is type ke control action me do type k control ko combine karke ek controller banaya jata hai sirf on off control action ko chhod kar.

These control action are as follows:-

i) Proportional Plus Integral Control Action

 PI controller me output , input error aur time integral ke input ke proportional hota hai.

Time integral Tme changes ke liye ek nob diya hota hai jo control action ko adjust karta hai Tke inverse ko reset rate kaha jata hai. reset ko repeats per minutes me measure kiya jata hai i,e, ek minute me  control action ke proportional part ke duplicate hone ka rate.

ii) Proportional Plus Derivative Control Action

Isme, derivative action ki wajah se controller ka output badal jata hai ise wajah se rate of actuating error signal is change. Ya ham keh sakte hain ki isme, derivative action ki wajah se output vary ( badalta ) karta hai jaise jaise actuating error vary karti hai. 

Iske istemal ka main reason ye hota hai ki ye system ko ek stability provide karne ka hota hai kyuki ye future maie aane  wali errors ko prejudge kar leta hai aur uska correction provide krata hai.

PID Controller

PID Controller  ka full form Proportional Integral Derivative hota hain . Ye ek tarah ka close loop system hota hai. So jaise ki har close loop system me ek feedback control system present  hota hai  wese hi isme bhi present hota hai aur ye controller compare karta hai process valuable ko set point se aur ek  error signal generate karta hai aur is error signal ke according ye adjust karat hai system ke output ka. Aur ye process tab tak chalti hai jab tak process variable equal na ho jae set point ke.

Feed Forward Control System

Ye system maintain rakhta hai feedback control  system ke limitation ko. Is system me process ke beech me  produce hone wali disturbance measure kiue jate hain aur controlled variable ke set point se hatne se pahle hi usko correct kar diya jata hai . Inko istemal islie kiya jata hai ki controlled variable ko  zyada se zyada set point par banae rakha ja sake.

Cascade Control System

Ye ek tarah ki process hoti hai jo ki disturbance response ke liye ek integral error ko peak par or least par point par karte hue control strategies ki performance ko effecetive banati hain. Ye system kuch disturbance effects ko remove karta hai aur control loop ki dyanamic performance ko better karte hain.


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