Variable frequency speed regulating method for multiple water injection pumps in oilfield water injection station

Abstract

The invention relates to a variable frequency speed regulating method for multiple water injection pumps in an oilfield water injection station, and the variable frequency speed regulation of multiple water injection pumps is uniformly completed by a variable frequency speed regulating system. The variable frequency speed regulating system is composed of a coiling type motor and a rotor variable frequency control system; the rotor variable frequency control system comprises a rectifier, a direct current chopper and an inverter; the rectifier is connected with a rotor winding of the coiling type motor; the rectifier is orderly connected with the direct current chopper and the inverter in series, a slip power is fed back to a power grid by the inverter; when a plurality of coiling type motors are provided, the rotor winding of every coiling type motor is connected with the rectifier and the direct current chopper orderly in series and then connected with the same one inverter; the slip powers of the plurality of motors are fed back to the power grid through the inverter; a trigger angle beta of the inverter is adjusted to the minimum angle and keeps constant, so that the high-efficient feedback of the slip power and the regeneration energy is achieved; according to the rotor variable frequency speed regulating method provided by the invention, the energy consumption of the water injection pumps can be reduced by more than 15%.

Description

technical field [0001] The invention relates to a frequency conversion speed regulation method for motors of multiple water injection pumps in an oil field water injection station. Background technique [0002] In the process of oilfield water injection, due to the consideration of later production construction deployment and changes in injection volume, the design margin of water injection capacity of water injection stations is generally too large. The energy loss is serious. Ordinary frequency conversion speed regulation technology is to adjust the β angle of the inverter to realize the speed regulation function, but the adjustment range of the angle is limited, and the accuracy is difficult to control accurately. Due to the limited adjustment range, backflow cannot be completely eliminated, and the energy-saving effect is limited. Contents of the invention [0003] The purpose of this invention is to design a "one drive multiple" rotor frequency conversion speed regu...

AI Technical Summary

Problems solved by technology

By adjusting the duty cycle of the chopper, the stepless speed regulation of the motor can be realized, and the problem of the mismatch between the actual water injection volume and the displacement of the water injection pump, the large return flow in the station, and the serious loss of energy consumption can be solved.

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