Liquid-Level Control in Single Tanks and Cascades of Tanks with Proportional-Only and Proportional-Integral Feedback Controllers

1979 ◽  
Vol 18 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Tak-Fai Cheung
Keyword(s):  
Liquid Level ◽  
Level Control ◽  
Feedback Controllers ◽  
Proportional Integral ◽  
Integral Feedback ◽  
Liquid Level Control

Integral Time Absolute Error Minimization For Pi Controller On Coupled–Tank Liquid Level Control System Based On Stochastic Search Echniques

2012 ◽  
Author(s):  
Ammar Hussam Yousif Yacoub ◽  
Salinda Buyamin ◽  
Norhaliza Abdul Wahab
Keyword(s):  
Genetic Algorithm ◽  
Simulated Annealing ◽  
Absolute Error ◽  
Pi Controller ◽  
Stochastic Search ◽  
Time Response ◽  
Liquid Level ◽  
Level Control ◽  
Proportional Integral ◽  
Liquid Level Control

Kertas ini membincangkan tentang aplikasi teknik pencarian stochastic yang dikenali sebagai Simulated Annealing bagi mengatasi masalah menala (tuning) alat pengawal Proportional plus Integral (PI) bagi pengawalan takat cecair di dalam sistem tangki berkembar. Setelah penerangan tentang prinsipal asas kepada Simulated Annealing diberikan, kertas ini mencadangkan tentang pencarian penyelesaian yang optimal bagi alat kawalan PI dengan mengoptimumkan prestasi indek, ITAE. Keberkesanan menggunakan kaedah Simulated Annealing telah dibandingkan dengan satu lagi kaedah iaitu Genetic Algorithm. Perbandingan adalah berdasarkan prestasi time response. Hasil keputusan menunjukkan perbandingan antara kaedah Simulated Annealing dan Genetic Algorithm. Kaedah yang di cadangkan tidak bergantung kepada tahap sesuatu sistem dan berupaya untuk menala walaupun tanpa diketahui parameter sesuatu proses . Di samping itu, kaedah yang di cadangkan tidak memerlukan sistem tersebut dimodelkan dalam bentuk matematik dan keseluruhan keputusan menunjukkan Simulated Annealing menghasilkan keputusan yang lebih baik dari Genetik Algorithm. Oleh itu, Simulated Annealing bolehlah dicadangkan sebagai salah satu cara bagi mengoptimumkan alat kawalan PI. Kata kunci: Penalaan proportional integral tuning; imulated annealing; genetic algorithm This paper introduces the application of a stochastic search technique, known as Simulated Annealing to the problem of tuning the proportional–integral controller for a linearized coupled tank liquid level control. After describing the basic principles of the Simulated Annealing, the proposed method concentrates on finding the optimal solution of PI controller by optimizing the performance index, the Integral Time Absolute Error, ITAE. The efficiency of Simulated Annealing algorithm for tuning the controller is compared with an evolutionary method, Genetic Algorithm. The comparison is based on the time response performance. The results shows the effectiveness and the capability of the SA to tune the proportional–integral (PI) controller for the coupled tank liquid level control. The proposed method does not depend on the system order and has the ability to tune the controller even there is unknown process parameters. In addition, the technique avoids the requirement for mathematical modeling of the system and the overall results have shown that SA yields better performance as compared to GA, hence, it is recommended for an alternative for optimizing the PI controller. Key words: Proportional integral tuning; simulated annealing; genetic algorithm

Liquid Level Control of Four-Tank System Based on Active Disturbance Rejection Technology

Measurement ◽  
2021 ◽  
Vol 175 ◽  
pp. 109146
Author(s):  
Xiangxiang Meng ◽  
Haisheng Yu ◽  
Jie Zhang ◽  
Tao Xu ◽  
Herong Wu
Keyword(s):  
Disturbance Rejection ◽  
Liquid Level ◽  
Level Control ◽  
Active Disturbance Rejection ◽  
Tank System ◽  
Liquid Level Control

scholarly journals RESEARCH OF LIQUID LEVEL CONTROL SYSTEM / SKYSČIO LYGIO VALDYMO SISTEMOS TYRIMAS

2015 ◽  
Vol 7 (3) ◽  
pp. 317-322
Author(s):  
Dominykas Beištaras
Keyword(s):  
Fuzzy Logic ◽  
Control System ◽  
Fuzzy Logic Controller ◽  
Liquid Level ◽  
Water Tank ◽  
Level Control ◽  
Level Control System ◽  
Filling Time ◽  
Control System Model ◽  
Liquid Level Control

This paper presents liquid level control system model and analysis of dynamic characteristics. The system consists of scalar controlled induction motor drive, fuzzy logic controller, water tank and centrifugal pump. Simulink models of water tank, pump and controller are presented. The simulation of the system shows that the use of fuzzy logic controller reduces valve opening time and reservoir filling time. Nagrinėjamas skysčio lygio valdymo sistemos imitacinių modelių sudarymas, analizuojamos dinaminės charakteristikos. Valdymo sistema sudaryta iš skaliariniu būdu valdomos dažninės elektros pavaros su neraiškiosios logikos reguliatoriumi, vandens rezervuaro ir išcentrinio siurblio. Sudaryti rezervuaro, siurblio ir reguliatoriaus Simulink modeliai. Atlikus imitacijas gauta nedimensinė siurblio charakteristika, apibūdinanti siurblio veikimą, esant bet kokiam sukimosi greičiui. Nustatyta, kad sistemoje su neraiškiosios logikos reguliatoriumi vožtuvas yra atidaromas greičiau nei sistemoje su proporcinguoju integraliniu (PI) reguliatoriumi, ir todėl sumažinama rezervuaro pripildymo trukmė.

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