Medium-voltage frequency conversion speed regulation device special for electric submersible pump

Abstract

The invention relates to a medium-voltage frequency conversion speed regulation device special for an electric submersible pump. A three-phase 700V-3,300V alternating current passes through the input of a rectifier module and is firstly converted into a direct current, the output of the rectifier module is connected with a direct-current filter module in parallel, the direct current is filtered, the positive voltage output, the zero voltage output and the negative voltage output of the direct-current filter module are connected to corresponding positions of an inverter module, a three-phase alternating voltage output by the inverter module is connected to a sine wave filter, and the filtered three-phase alternating voltage is connected to an electric submersible pump unit through the output of the sine wave filter. The inverter module is of a three-level topological structure formed by an IGBT module with the rated voltage of 6,500 V, direct frequency conversion speed regulation can be achieved under the 3,300V alternating voltage, a transformer does not need to be boosted, and the occupied area and cost of equipment are lowered. Meanwhile, the sine wave filter is integrated inside, the need of the electric submersible pump for long cable supply can be met, insulation damage caused by harmonic waves to a power supply cable and the electric submersible pump unit is lowered, the service life of the device is prolonged, and the maintenance cost of the device is lowered.

Description

technical field [0001] The invention belongs to the technical field of power electronic variable current, and relates to a medium-voltage variable frequency speed regulating device for a submersible electric pump, which is suitable for the special frequency conversion and speed regulating device for a submersible electric pump unit in the petroleum industry. Background technique [0002] As an important equipment in the oil production industry, electric submersible pumps have been widely used in major oil fields. The submersible electric pump unit is composed of a submersible centrifugal pump, a separator, a protector, a submersible motor and a submersible cable. The difference between the submersible motor and the ordinary asynchronous motor is that the rotor is composed of multiple identical rotor segments, central bearings and rotating shafts, so its rated voltage is in the range of 1000V to 2500V. Usually, in order to adapt to the voltage range of the submersible motor,...

AI Technical Summary

Problems solved by technology

In addition, since the submersible electric pump unit usually works underground at a depth of more than 1,000 meters, the length of the power supply cable is also more than 1,000 meters. Insulation of cables and motors shortens service life

Images