DISTRIBUTED INSTRUMENTATION FOR OPTIMUM CONTROL OF VARIABLE SPEED ELECTRIC PUMPING PLANTS WITH CENTER PIVOTS
暂无分享,去创建一个
Pressure measurements at critical locations in the irrigation system (distributed pressure measurements) were
used to optimize operation of an electric pumping plant equipped for variable speed operation. Operation of the pumping
plant was optimized in terms of providing adequate irrigation coverage with minimum energy use. The pumping plant
supplied water to a single center pivot on undulating topography. The center pivot was equipped with a supervisory
control and data acquisition system for variable rate water application. Electrical demand of the irrigation system was
evaluated under four variable speed pumping control schemes. Disregarding inefficiencies of the variable frequency
motor controller, distributed pressure measurement resulted in 15.8 and 20.2% energy savings compared to constant
speed pumping for uniform and variable rate irrigation, respectively. When the efficiency of the variable frequency motor
controller is accounted for, distributed pressure measurement resulted in 7.5 and 12.4% energy savings compared to
conventional constant speed pumping for uniform and variable rate irrigation, respectively. Use of distributed pressure
measurements to control the variable speed pumping plant was highly effective in minimizing energy use while
maintaining the pressure required throughout the irrigation system.