Optimalisasi Performa Sistem Kontrol 3-Elemen Level Air Steam Drum Menggunakan Hybrid Fuzzy-PID Pada PLTU PT PLN Nusantara Power UP Gresik
EVANDI PRADAVI, Dr. Raden Sumiharto, S.Si., M.Kom
2024 | Skripsi | ELEKTRONIKA DAN INSTRUMENTASI
The Feed Water Flow Control System is one of the main control systems at PLTU PT PLN Nusantara Power UP Gresik for regulating the operation of the hot water boiler using 1-element or 3-element modes. The 3-element mode, which uses inputs from the steam drum level, feed water flow, and steam flow, provides better feedback compared to the 1-element mode. The existing control method, Proportional-Integral (PI), is considered less adaptive to variations in generator power load (MW) without proper and periodic tuning. The Hybrid Fuzzy-PID method is believed to speed up response time and improve system stability.
This study aims to optimize the response time of the 3-element steam drum water level control system through simulations in MATLAB by comparing the step responses produced by the PI (existing), PD, PID, and Hybrid Fuzzy-PID methods when given an input set point for the steam drum level. The response time analysis uses parameters such as rise time, settling time, overshoot, and undershoot based on the step response results from the MATLAB simulations.
Based on the simulations and testing conducted, the Hybrid Fuzzy-PID method demonstrated superior performance with an overshoot reduction of 81% to 89%, an undershoot reduction of 27% to 40%, and a faster settling time of 59% to 73% compared to the PI (existing), PD, and conventional PID control methods. However, the Hybrid Fuzzy-PID method exhibited a slower rise time, being 127% to 191% slower than the PI (existing), PD, and conventional PID control methods. From these simulation results, the Hybrid Fuzzy-PID method is capable of improving the response of the water level control system in the steam drum, thereby potentially reducing moisture in the turbine area and maintaining the stability and efficiency of the hot water boiler at PLTU PT PLN Nusantara Power UP Gresik.
Kata Kunci : Fuzzy-PID, Level, Steam Drum