Analisa Kestabilan Sistem Kendali Eksitasi Generator Tipe Arus Searah Tanpa dan dengan Pengendali Berdasarkan Pendekatan Tanggapan Frekuensi

Abstract

Abstrak-Jurnal ini membahas tentang analisa kestabilan sistem kendali eksitasi generator tipe arus searah tanpa dan dengan pengendali. Analisa kestabilan yang dilakukan meliputi analisa kestabilan mutlak, analisa kestabilan relatif dan analisa kestabilan internal. Untuk analisa kestabilan mutlak ditunjukkan dengan menggunakan nilai margin penguatan dan nilai margin fasa. agar performansi sistem memuaskan maka diusahakan nilai margin penguatan ini besar dari 6 dB dan nilai margin fasa berkisar antara 30 0 sampai 60 0 . Untuk kestabilan relatif ditunjukkan dengan nilai puncak resonansi. Sistem akan bersifat stabil relatif jika nilai puncak resonansi berkisar antara 1.10 s/d 1.50. sistem akan bersifat stabil internal jika semua fungsi alih lingkar tertutup dari masukan ke keluaran internal bersifat stabil. Untuk indikator kestabilan internal ini ditunjukkan oleh angka 0 jika sistem bersifat stabil internal dan angka 1 jika sistem bersifat tidak stabil internal. Untuk pengendali yang digunakan terdiri dari pengendali Proporsional (P), pengendali Proporsional Integral (PI), pengendali Proporsional Diferensial (PD) dan pengendali Proporsional Integral Diferensial (PID). Pengendali -pengendali tersebut dirancang dengan pendekatan tanggapan frekuensi. Hasil yang diperoleh bahwa tanggapan tegangan sistem eksitasi generator tipe arus searah dengan pengendali Proporsional (P), pengendali Proporsional Integral (PI), pengendali Proporsional Diferensial (PD) dan pengendali Proporsional Integral Diferensial (PID) bersifat stabil mutlak, stabil relatif dan stabil internal.Kata kunci : sistem eksitasi, kestabilan mutlak, kestabilan relatif, kestabilan internal, tanggapan frekuensi Abstract-This journal discussed the stability analysis of generator excitation control system in type of direct current without and by using controller. The stability Analysis was conducted on absolute stability analysis, relative stability analysis and internal stability analysis. For the absolute stability analysis was demonstrated by using gain margin and phase margin value. In order to get satisfied system performance so that cultivated gain margin value was greater than 6 dB and phase margin value was in ranges from 30 0 to 60 0 . For the relative stability was shown by the peak value of resonance. The system would be relatively stable if the peak value of resonance range was between 1:10 to 1:50. The system would be internal stable if all closed circle transfer functions from input to internal output was stable. For internal stability indicator was shown by number 0 if the system is internally stable and number 1 if the system was internally unstable. For controllers used consisted of Proportional controller (P), Proportional Integral controller (PI), Proportional Differential controller (PD) and Proportional Integral Differential controller (PID). The controllers were designed with a frequency response approach. The results showed that the voltage response of generator excitation system type direct current with Proportional controller (P), Propo...

Design of PLC Based Control System for Rotary Flexible Fixture with PID Compensator

“…Another way to examine system's stability were via frequency response of its open loop equation written as G(s) H(s), the method were called Nyquist method. By turning the open loop equation into its frequency counterpart G(jω) H(jω) and plotting the result when the value of ω were zero to infinity we would end up with a graphical representation known as Nyquist diagram [5], [6]. The examination of system's stability according to Nyquist were quite simple, as long as the diagram does not encircle point (-1+j0) then the system was stable.…”