Simulation study of mixed pressure and flow control systems for optimal operation of centrifugal pumping plants

Abstract

A Simulink/DriveSize based model for the mutual pressure and flow control of a centrifugal pumping plant with a variable speed drive is proposed. The model provides the possibility of power calculation during both throttling and speed control and to estimate the optimal working point according to these calculations. The model is developed to provide the possibility of power reduction during pressure and flow maintenance with the help of mixed pressure control strategy. To evaluate the system, a series of experiments have been conducted. After the validation of the proposed model through testing, which proved that the designed system is more beneficial from the power consumption point of view than the traditional pressure control methods, it can be stated that the system is useful for pressure and flow control optimization of the centrifugal pumping plants

Improving High Efficiency and Reliability of Pump Systems using Optimal Fractional-order Integral Sliding-Mode Control Strategy

“…The induction machine losses are classified as clearly, explained in the IEEE Standard into: stator joule losses; rotor Joule losses; friction, windage losses; core losses; stray-load losses; and brush contact losses (in wound rotor machines) [1], [2], [3], [4], [5]. In terms of d-and q-axis current components on the basis of [5], the total power losses of the induction machine can be described as follows…”

“…where ω r , L m ,(L r ; R r ),(L s ; R s ), c F e and c str are the rotor angular speed, mutual inductance, rotor self inductanceresistance, stator self inductance-resistance and the stray and iron losses coefficients respectively. Then the overall squirrel-cage induction motor electric power loss can be expressed as [4], [5]:…”

“…2) Mathematical Modelling of Pump: The polynomial approximation of a centrifugal pump, able to predict the pressure differential H created by impeller rotating speed [1], [2], [4], [5], [6], [7], [8].…”

“…include throttling valve regulation and variable speed drives (VSD), which are the two most common ways used in industry to regulate flow rate. According to research, VSDfed IM reduces energy costs by modifying the hydraulic working point [3], [4], [5], [6]. The optimization of variablespeed pumps to achieve maximum efficiency of the pump system is a challenging due to the constraints of the system, evolutionary algorithms have been widely concerned by researchers to solve the optimization problem such as, Genetic algorithms, simulated annealing, particle swarm optimization, ant colony optimization; fuzzy optimization, golden section search (GSS), neural-network-based methods, Multi-objective optimization, convex problems, and multidisciplinary optimization.…”

Optimal Control of Automatic Manipulator for Elimination of Galvanic Line Load Oscillation

“…Traditional fixed-gain Proportional-Integral (PI) and Proportional-Integral-Derivative (PID) controllers are very sensitive to parameter variations and load disturbances [39]. Control systems with standard PID controllers are widely used in different areas of manufacturing [40][41][42], but simplified to PI-controllers [43] due to simple structure and accessible calculation of regulator coefficients. The proportional gain determines are used to accelerate the transition process, as well as to counter the deviation of the controlled variable.…”