Comment on "Optimal tuning of sigmoid PID controller using nonlinear sine cosine algorithm for the automatic voltage
Debdoot Sain1, Manoranjan Praharaj2, Jung-Min Yang1
1School of Electronic and Electrical Engineering, Kyungpook National University, 80 Daehakro, Bukgu, Daegu 41566, Republic of Korea.
ISA Transactions
|October 16, 2023
Summary
Relative stability analysis for automatic voltage regulator systems is more accurate using loop transfer functions (LTFs) than closed-loop transfer functions (CLTFs). This study highlights LTFs for reliable stability assessments in control systems.
Area of Science:
- Control Systems Engineering
- Electrical Engineering
- Systems Analysis
Background:
- Accurate relative stability analysis is crucial for designing reliable automatic voltage regulator (AVR) systems.
- Previous studies, such as Suid and Ahmad (2022), have utilized various methods for PID controller tuning in AVR systems.
- The choice of transfer function representation can impact the perceived stability of a control system.
Purpose of the Study:
- To critically analyze the relative stability results obtained using closed-loop transfer functions (CLTFs) in the context of AVR systems.
- To compare the reliability and accuracy of stability analysis using CLTFs versus loop transfer functions (LTFs).
- To provide guidance on the appropriate use of transfer functions for stability assessments in control engineering.
Main Methods:
- Re-evaluation of relative stability analyses previously performed using root locus and Bode plots.
- Comparative analysis of stability results derived from CLTFs and LTFs.
- Theoretical examination of the mathematical implications of using CLTFs versus LTFs in stability analysis.
Main Results:
- The use of closed-loop transfer functions (CLTFs) for relative stability analysis can yield less accurate and potentially misleading results.
- Stability analyses based on loop transfer functions (LTFs) demonstrate superior reliability and accuracy.
- Root locus and Bode analyses are more reliably interpreted when applied to LTFs for AVR systems.
Conclusions:
- Loop transfer functions (LTFs) are recommended over closed-loop transfer functions (CLTFs) for accurate relative stability analysis in control systems.
- The findings underscore the importance of selecting the correct transfer function representation for valid stability assessments.
- This work provides a critical perspective on established methods for analyzing the stability of automatic voltage regulator systems.
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