Surge Tank System Research Articles

Comparative performance analysis of fractional-order nonlinear PID controller for complex surge tank system: tuning through machine learning control approach

Comparative performance analysis of fractional-order nonlinear PID controller for complex surge tank system: tuning through machine learning control approach

Nonlinear hydraulic coupling characteristics and energy conversion mechanism of pipeline - surge tank system of hydropower station with super long headrace tunnel

This paper aims to study the nonlinear hydraulic coupling characteristics and energy conversion mechanism of pipeline - surge tank system of hydropower station with super long headrace tunnel. Firstly, the model of hydropower station considering nonlinear hydraulic coupling of pipeline - surge tank system is established. Then, the dynamic behaviors are evaluated, and the effects of nonlinear head losses of pipeline - surge tank system on dynamic behaviors are analyzed. Finally, the energy conversion mechanism of pipeline - surge tank system is revealed. The results indicate that both the nonlinear head loss term of super long headrace tunnel and linear head loss term of penstock are unfavorable for stability. The nonlinear throttling orifice head loss of surge tank has a remarkable impact on dynamic response processes. The nonlinear head losses of pipeline - surge tank system mainly affect the kinetic energy of flow in pipeline. A part of the kinetic energy of flow in pipeline interconverts with the kinetic energy of flow in surge tank.

COMPUTERISED CALCULATIONS FOR WATER LEVEL AND VELOCITY VARIATIONS IN THE SURGE TANK SYSTEM

Water level variations in the surge tank and velocity vanatlOn in the pressure conduits in a surge tank system can be computed by using the finite difference solution of the governing differential equations. A computer program that was written in Fortran 77 is based on the solution technique. A laboratory experiment in determining the variations of water level in a surge tank was conducted to complement the development of the computer program. The results of the calculated and recorded surge tank water level variation:>are compared and a goodness of a regression curve is expected.

Optimization of hydraulic systems for pumped storage schemes – Development of a new Three chamber surge Tank system

Durch die veranderten Marktbedingungen des europaischen Strommarktes ist ein steigender Bedarf an Spitzenenergie zu verzeichnen. Kurzere Regelzeiten und haufigere Lastwechsel zeigen die Notwendigkeit einer Verbesserung in der "Wasserschlossstrategie". Das Dreikammerwasserschloss mit getrennten und durchstromten Unterkammern ist eine vollig neuartige Konfiguration fur Unterwassersysteme von Pumpspeicheranlagen. Durch Trennung und nachherige Zusammenfuhrung der Wassersaule im Triebwassersystem kann mit diesem Typus auf spezielle divergierende Auslegungskriterien eingegangen und entscheidende Kostenvorteile gegenuber herkommlichen Wasserschlosstypen erzielt werden. Im Beitrag wird die grundlegende Funktionsweise des Dreikammerwasserschlosses beschrieben, welches derzeit am Institut fur Wasserbau und Wasserwirtschaft der TU Graz im Rahmen eines Forschungsprojektes der Forschungsforderungsgesellschaft des Bundes (FFG) entwickelt wird.

A non-linear dynamic model identification challenge problem

A non-linear dynamic model identification challenge problem is proposed. The problem is to identify a dynamic model from single input single output data from a laboratory surge tank system that was built expressly for generating non-linear input output data. The problem is divided into six separate tests that challenge the ability of the modeling method to produce a model that interpolates well, degrades gracefully when extrapolating and is robust to noise in the identification data. Instructions are given for the development and testing of the models and for reporting the results. It is hoped that this problem will lead to a more constructive comparison of non-linear modeling methods than has been seen to date.

Analysis of dynamic properties of a water turbine governor and study of the stability criteria of a surge tank system in a hydraulic power station.

The speed of a water turbine is regulated by a governor and a typical feed back control system is composed of the governor, the turbine and its load. The paper deals with the characteristics of a tachometric governor with temporary speed droop. First the dynamic properties of the governing system and the controlled system are expressed in the form of a block diagram, and a few considerations such as harmonic response, step response and self-excited oscillations of the system are conducted using an electronic analogue computer. Secondly, concerning the stability criteria of a surge tank system in a hydraulic power station, theoretical studies are pursued and compared with the classical Thoma formula which is based on the governing equation of ηQH=constant. The temporary speed droop equipped in the governor has an effective function to stabilize the surge tank system, and the paper presents a new formula which gives a smaller net area of the surge tank than that obtained from the Thoma formula.

Optimal averaging level control

AbstractAn optimal averaging level control problem is defined and solved for a surge tank system. Two averaging level controllers, the ramp controller and the optimal predictive controller are developed utilizing the optimal control policy. These controllers are compared with previously reported averaging level controllers for step and sinusoidal disturbances in inlet flow rate. The OPC results in improved disturbance filtering characteristics for most of the disturbances considered and is very simple to implement.

On a non-linear differential equation common to several problems in hydraulics: An addendum

Derived in this paper is an expression relating the maximum value of the dependent variable ξ (dimensionless surge height) to the system parameter ψ (dimensionless damping parameter) for the simple surge tank system equation: d 2ξ dθ 2 +ψ dξ dθ dξ dθ + (2φ) 2 ξ = 0 The analytically derived relation gives results which are identical to those obtained from a parametric computer solution of the parent equation.

On a non-linear differential equation common to several problems in hydraulics

The equation, d 2 x d θ 2 + ψ d x d θ | d x d θ | + ω 2 x = 0 results from the analysis of several hydraulic systems having flows of significant inertia and absquare energy dissipation. In navigation locks the Venturi-Loop systems as well as the longitudinal Conduit and Lateral-Port system are reduced to this equation. In hydroelectric installations the Simple Surge Tank system is described exactly by this equation upon flow cessation in the penstock and under the same flow conditions, the Differential Surge Tank system has been approximated by it. This paper seeks to attract attention to an approximation to the envelope of the solution of this equation which envelope is much better than what is found in the literature of hydraulics; to show that this envelope fits exactly digital as well as analog computer solutions of above equation, and to show how one can apply this envelope with the aid of data from previous computer solutions.

Closure to “Design of Chute-Des-Passes Surge Tank System”

Closure to “Design of Chute-Des-Passes Surge Tank System”