Electric fracturing higher harmonic suppression device and method

Abstract

The invention discloses an electric fracturing higher harmonic suppression device and method. The device comprises a high-voltage power distribution room (4), a high-voltage power line is arranged in the high-voltage power distribution room (4), and the high-voltage power line is connected with a plurality of variable-frequency power supply rooms arranged outside the high-voltage power distribution room (4); a 12-pulse rectifier transformer and a high-voltage frequency converter are arranged in each variable-frequency power supply room, the 12-pulse rectifier transformers are connected with the high-voltage frequency converters, the high-voltage frequency converters are connected with fracturing motors arranged outside the variable-frequency power supply rooms, the fracturing motors are connected with electric fracturing pumps, every three electric fracturing pumps form a group, and the electric fracturing pumps form a group; and three 12-pulse rectifier transformers correspondingly connected with the electric fracturing pump form a multi-pulse rectifier system, and 10-degree phase differences are formed among low-voltage windings of the multi-pulse rectifier system. Higher harmonics can be suppressed to a great extent, and the problem of harmonic pollution of a power grid is avoided.

Description

technical field [0001] The invention relates to the technical field of power transmission, in particular to a device and method for suppressing high-order harmonics of electric fracturing. Background technique [0002] Inverter (Variable-frequency Drive, VFD) is a power control device that uses frequency conversion technology and microelectronics technology to control AC motors by changing the frequency of the motor's operating power supply. [0003] The frequency converter is mainly composed of rectification (AC to DC), filter, inverter (DC to AC), braking unit, drive unit, detection unit, micro-processing unit, etc. The frequency converter adjusts the voltage and frequency of the output power supply by switching off the internal IGBT, and provides the required power supply voltage according to the actual needs of the motor, thereby achieving the purpose of energy saving and speed regulation. In addition, the frequency converter has many protection functions , such as over...

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Problems solved by technology

But at the same time, it also brings negative effects. The large-scale application of a large number of 12-pulse frequency converters will greatly increase the 11th and 13th harmonics and high-order harmonics, which will cause local grid voltage distortion and cause changes in the operating parameters of various electrical equipment. Cannot operate normally, affecting the safety of the power grid

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