Application of Disturbance Observer-Based Fast Terminal Sliding Mode Control for Asynchronous Motors in Remote Electrical Conductivity Control of Fertigation Systems
Abstract
:1. Introduction
2. Materials and Methods
2.1. Description of the Remote Conductivity Control System for the Fertigation Machine
2.2. Asynchronous Motor Mathematical Model
2.3. Internal Model Controller Design
2.4. Fuzzy Sliding Mode Speed Regulator Design
2.5. Fast Terminal Sliding Mode Control Method Based on Asynchronous Motor Disturbance Observer
2.5.1. Load Disturbance Observer Design
2.5.2. Fuzzy Sliding Mode Speed Controller Design
2.6. Test Platform
3. Results and Discussion
3.1. Control Results of the Asynchronous Motor
3.1.1. Motor Speed Control
- During the start-up phase of the asynchronous motor, FTSMC-DO control reaches the set speed faster than PID and SMC controls, with virtually no overshoot.
- Under sudden load conditions, the speed under PID control significantly drops, while the FTSMC-DO control demonstrates enhanced speed regulation capability, maintaining the set speed effectively.
- During acceleration and deceleration, PID and SMC controls show noticeable delays in adjustment time, whereas FTSMC-DO control exhibits rapid and accurate convergence speed.
3.1.2. Motor Torque Control
- During steady operation, traditional PID control exhibits significant fluctuations, SMC control still shows noticeable fluctuations, while FTSMC-DO control has substantially less fluctuation.
- At 25 s under sudden load, traditional SMC control takes longer to stabilize and still displays some fluctuation. FTSMC-DO control smoothly transitions and quickly reaches a steady state with minimal fluctuation.
3.2. Experimental Validation
4. Conclusions
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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NB | NS | ZO | PS | PB | |
---|---|---|---|---|---|
NB | ZO | NS | NS | NS | NB |
NS | PS | ZO | NS | ZO | NS |
ZO | PS | PS | ZO | ZO | NS |
PS | PB | PS | PS | PS | ZO |
PB | PB | PS | PS | PS | PS |
Control Method | Target EC (mS·cm−1) | Steady State EC (mS·cm−1) | Fluctuation Range (mS·cm−1) | Steady State Time (s) | Overshoot (%) |
---|---|---|---|---|---|
PID | 1.4 | 1.25~1.56 | 0.42 | 155 | 19.2 |
1.8 | 1.65~1.93 | 0.38 | 175 | 21.7 | |
2.2 | 2.10~2.30 | 0.29 | 190 | 24.9 | |
SMC | 1.4 | 1.30~1.50 | 0.31 | 115 | 15.4 |
1.8 | 1.67~1.90 | 0.28 | 120 | 16.3 | |
2.2 | 2.12~2.28 | 0.20 | 135 | 17.1 | |
FTSMC-DO | 1.4 | 1.18~1.60 | 0.20 | 95 | 14.5 |
1.8 | 1.60~1.98 | 0.18 | 100 | 15.7 | |
2.2 | 2.06~2.35 | 0.16 | 120 | 16.1 |
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Wang, H.; Zhao, J.; Zhang, L.; Yu, S. Application of Disturbance Observer-Based Fast Terminal Sliding Mode Control for Asynchronous Motors in Remote Electrical Conductivity Control of Fertigation Systems. Agriculture 2024, 14, 168. https://doi.org/10.3390/agriculture14020168
Wang H, Zhao J, Zhang L, Yu S. Application of Disturbance Observer-Based Fast Terminal Sliding Mode Control for Asynchronous Motors in Remote Electrical Conductivity Control of Fertigation Systems. Agriculture. 2024; 14(2):168. https://doi.org/10.3390/agriculture14020168
Chicago/Turabian StyleWang, Huan, Jiawei Zhao, Lixin Zhang, and Siyao Yu. 2024. "Application of Disturbance Observer-Based Fast Terminal Sliding Mode Control for Asynchronous Motors in Remote Electrical Conductivity Control of Fertigation Systems" Agriculture 14, no. 2: 168. https://doi.org/10.3390/agriculture14020168