Energy Savings by Variable-Speed Control of Commercial Pumps

2012 ◽  
Author(s):  
Somchart Chantasiriwan
Keyword(s):  
Energy Savings ◽  
Speed Control ◽  
Variable Speed ◽  
Variable Speed Control

Mathematical modelling of supermarket refrigeration systems for design, energy prediction and control

2000 ◽  
Vol 214 (2) ◽  
pp. 101-114 ◽  
Author(s):  
Y T Ge ◽  
S A Tassou
Keyword(s):  
Energy Savings ◽  
Control Strategies ◽  
Speed Control ◽  
Variable Speed ◽  
Ambient Conditions ◽  
Energy Prediction ◽  
Head Pressure ◽  
Component Models ◽  
And Control ◽  
Variable Speed Control

This paper describes a mathematical model developed to simulate the performance of supermarket refrigeration systems. Such a model can be used for the comparison of different systems and control strategies in terms of their energy and total equivalent warming impact. The model is based on a large number of component models which have been linked together within the TRNSYS environment. Major component models include the compressor, air-cooled condenser, thermostatic expansion valve, display cabinet and control. The overall system model has been validated against monitored data obtained from both a laboratory-based system and a full-scale system in a supermarket in Scotland. The value of the model is illustrated by determining and comparing the effectiveness of head pressure and variable-speed control against fixed head pressure and constant speed control. It is shown that even at summer ambient conditions the system can be operated without problems at much lower head pressures than is done in practice under fixed-pressure control strategies. The use of variable-speed control on one of the compressors can also provide better control of the suction pressure and a substantial (up to 23 per cent) energy savings compared to on-off control.

scholarly journals Using Variable Speed Control on Pump Application

2012 ◽  
Vol 2 (1) ◽  
pp. 251
Author(s):  
Dr.Sc. Aida Spahiu ◽  
Dr.Sc. Orion Zavalani ◽  
MSc. Altin Uka
Keyword(s):  
Energy Efficiency ◽  
Energy Savings ◽  
Speed Control ◽  
Reference Points ◽  
The European Union ◽  
Variable Speed ◽  
Centrifugal Pumps ◽  
Variable Speed Drive ◽  
Carbon Dioxide Co2 ◽  
Variable Speed Control

Pumps are one of the most common variable speed drive (VSD) system applications and special interest has focused on improving their energy efficiency by using variable speed control instead of throttling or other less efficient flow control methods. Pumps are the single largest user of electricity in industry in the European Union, consuming 160 TWh per annum of electricity and accounting for 79 million tonnes of carbon dioxide (CO2) emissions [1]. Centrifugal pumps are the most likely pump style to provide a favorable return based on energy savings when applied with a variable speed drive. To help illustrate this, are conducted benchmark testing to document various head and flow scenarios and their corresponding effect on energy savings. Paper shows the relationship of static and friction head in the energy efficiency equation and the effect of motor, pump and VSD efficiencies. The received results are good reference points for engineers and managers of water sector in Albania to select the best prospects for maximizing efficiency and energy savings.

Neuroadaptive Variable Speed Control of Wind Turbine With Wind Speed Estimation

2016 ◽  
Vol 63 (12) ◽  
pp. 7754-7764 ◽  
Author(s):  
Dan-Yong Li ◽  
Wen-Chuan Cai ◽  
Peng Li ◽  
Zi-Jun Jia ◽  
Hou-Jin Chen ◽  
...  
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Speed Control ◽  
Speed Estimation ◽  
Variable Speed ◽  
Variable Speed Control

Research on Power Regulation Schedule Control System for Turboprop Engine

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Tianqian Xia ◽  
Xianghua Huang
Keyword(s):  
Control System ◽  
Steady State ◽  
Fuel Consumption ◽  
Reference Model ◽  
Sliding Mode ◽  
Speed Control ◽  
Variable Speed ◽  
Turboprop Engine ◽  
Speed Control System ◽  
Variable Speed Control

Abstract A method of variable speed control system for turboprop engine is presented in this paper. Firstly, the steady operation state of turboprop engine is analyzed, and the operating line is figured out in the steady state characteristic diagram, which is the design basis of Engine Thrust Management System (ETMS). Secondly, the reference model sliding mode multivariable control is used to design the control law to follow the speed instructions given by ETMS. Finally, the optimization of the minimum fuel consumption operating curve is realized, and the control system designed is applied to a numerical model of a turboprop engine. The simulation results show that compared with the constant speed control system, the variable speed control system can reduce the specific fuel consumption by 2.37 % on average and 3.1 % in steady state conditions. Furthermore, the method can enable the pilot to manipulate the turboprop aircraft by using only one throttle lever, which can greatly reduce the pilot operation burden.

IMPROVED INDIRECT FIELD-ORIENTED CONTROL OF INDUCTION MOTOR DRIVE BASED PSO ALGORITHM

2016 ◽  
Vol 78 (6-2) ◽  
Author(s):  
Jamal Abd Ali ◽  
M A Hannan ◽  
Azah Mohamed
Keyword(s):  
Induction Motor ◽  
Speed Control ◽  
Pso Algorithm ◽  
Pi Controller ◽  
Field Oriented Control ◽  
Variable Speed ◽  
Three Phase ◽  
Indirect Field Oriented Control ◽  
Speed Response ◽  
Variable Speed Control

Optimization techniques are increasingly used in research to improve the control of three-phase induction motor (TIM). Indirect field-oriented control (IFOC) scheme is employed to improve the efficiency and enhance the performance of variable speed control of TIM drives. The space vector pulse width modulation (SVPWM) technique is used for switching signals in a three-phase bridge inverter to minimize harmonics in the output signals of the inverter. In this paper, a novel scheme based on particle swarm optimization (PSO) algorithm is proposed to improve the variable speed control of IFOC in TIM. The PSO algorithm is used to search the best values of parameters of proportional-integral (PI) controller (proportional gain (kp) and integral gain (ki)) for each speed controller and voltage controller to improve the speed response for TIM. An optimal PI controller-based objective function is also used to tune and minimize the mean square error (MSE). Results of all tests verified the robustness of the PSO-PI controller for speed response in terms of damping capability, fast settling time, steady state error, and transient responses under different conditions of mechanical load and speed.

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