METHOD TO CONTROL POWER CONSUMPTION OF PUMPING PLANT Russian patent published in 2007 - IPC F17D3/01 F04D15/00 

FIELD: water supply systems: pumping plants.

SUBSTANCE: according to proposed method used as transfer plant is pumping plant-system of pumps operating in parallel and set into operation by electric motors with power consumption N_pp of pumping plant used as controlled parameter and head H_in at input of system of pipes or in check point of system of pipes as controlled parameter, electric and/or digital values as transmitted values, regulator and/or dispatcher control panel as control unit. Used as managerial action are number and type of pumps operating simultaneously. At first stage physical parametric characteristics H-Q, N-Q, η-Q of pumps, characteristic of maximum tolerable pressure at pipe system input, characteristic of minimum tolerable pressure at pipe system input where is maximum head at pipe system input, is minimum head at pipe system input, H, Q are development head and capacity of pumps, N is power consumed by pumps and η of efficiency is pump efficiency are measured additionally by measuring complex. Then operating conditions and components of pumping equipment are optimized and actual parametric characteristics of pumps are compared with parametric characteristics of said pumps, after cutting of runners and change of rotor speed, with similar characteristics of new pumps of the same type or pumps of other type and comaring is carried out to definite optimum efficiency of pumping plant and basing on results of comparison, optimum operating conditions and components of pumping equipment are determined. Control characteristics R is determined depending on number and type of simultaneously operating pumps in form of curve which is such that all intermediate points of minimum power consumption of plant in direction of increase of power consumption N_pp lie on characteristic curve of maximum tolerable pressure at pipe system input, and all intermediate points of maximum power consumption of plant in direction of increase of power consumption N_pp lie on characteristic curve of minimum tolerable pressure at pipe system input. Characteristics of maximum tolerable pressure and minimum tolerable pressure at pipe system input are introduced additionally into control unit at increase (decrease) of value N_{pp i} measured in real time relative to preceding value N_{pp i-1} at condition that pressure at input of pipe system number and type of pumps operating at plant is not changed. At increase of value N_{pp i} measured in real time relative to preceding value N_{pp i-1} and condition that pressure at system input is additional pump of definite type is cut into operation. At decrease of value N_{pp i} measured in real time relative to preceding value N_{pp i-1} and condition that pressure at input of pipe system is power consumption is regulated by cutting out operating of definite type.

EFFECT: reduced capital outlays and service expenses.

5 cl, 2 dwg