The operation modes of a power-efficient system of control of a pumping plant variable-frequency electric drive

The possibility of using two-parameter regulation in the system of a variable-frequency electric drive of a pumping plant, taking into account changes in the current parameters of the hydraulic network, is demonstrated. The characteristics of the pump and the pipeline network during adjusting the capacity and changing the position of the stopcock at the output of the pump unit in the pressure stabilization system at the consumer are given. A block diagram of the system of power-efficient pumping unit control is proposed. It allows adjusting the reference signal in accordance with the deviation of the parameters of the hydraulic network. The curves of changes in the technological and power characteristics of the pump with one-parameter and two-parameter regulation with variable water consumption are considered. The possibility of improving the power efficiency of a pumping plant by using two-parameter control with increased water consumption is shown. It is obtained that reducing the accuracy of pressure maintenance at the consumer makes it possible to improve the efficiency of the pumping plant.