Water pump power generation system in pumping station and control method

Abstract

The invention provides a water pump power generation system in a pumping station and a control method. The system comprises a plurality of water pump motors, a plurality of water pumping pipes, a four-quadrant converter and a plurality of rotational speed detection units. The four-quadrant converter comprises a phase-shifting transformer, a control unit and a plurality of power units. Each power unit is composed of a rectifier unit and an inverter unit, wherein the rectifier unit and the inverter unit are connected via a DC bus. The control unit comprises a valve control sub-unit and a feedback control sub-unit. The valve control sub-unit starts the valve of a corresponding water pumping pipe when the rotational speed of a corresponding water pump motor, measured by any rotational speed detection unit, is larger than a rotational speed preset value. The feedback control sub-unit drives the rectifier unit to run in the energy feedback mode when the voltage of the DC bus is larger than a voltage preset value. According to the technical scheme of the invention, the four-quadrant converter realizes the drive control of water pump motors and the energy feedback of the water pump motors at the same time. Meanwhile, in combination with the control of a contactor, the energy can be efficiently fed back to a public supply network.

Description

technical field [0001] The invention relates to the field of water pumps, more specifically, to a water pump power generation system and a control method for a pumping station. Background technique [0002] A water pump is a machine that transports or pressurizes a liquid and is widely used in various pumping stations. At present, in some pumping stations, there is a potential need to use upstream water for reverse power generation. A water pump with good performance can not only pump water, but also operate as a water turbine. The water pump is generally designed according to its own highest operating efficiency. In order to overcome the loss of the flow channel, the head in the high-efficiency area is generally higher; when the water pump is operated as a water turbine, the water head during reverse power generation operation is often smaller than the rated head during pumping operation. Therefore, for general water pumps, the same speed operation mode has low operating ...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a pumping station water pump system with power generation function in view of the low energy feedback efficiency of the above-mentioned water pump during power generation operation

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