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Full-active dynamic harmonic suppression and reactive compensation system used for direct current motor-driven drilling machines

A technology of harmonic suppression and compensation system, applied in reactive power compensation, reactive power adjustment/elimination/compensation, AC network to reduce harmonics/ripple, etc. It can improve the power factor, reduce investment and reduce the power supply capacity of equipment.

Inactive Publication Date: 2014-12-03
SHANGHAI HUADUN GASOLINEEUM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned defects in the prior art, the object of the present invention is to provide a DC electric drill with full active dynamic harmonic suppression and reactive power that solves the problems of low power factor, large reactive power consumption, and serious harmonic distortion of the DC electric drill. compensation system

Method used

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  • Full-active dynamic harmonic suppression and reactive compensation system used for direct current motor-driven drilling machines
  • Full-active dynamic harmonic suppression and reactive compensation system used for direct current motor-driven drilling machines
  • Full-active dynamic harmonic suppression and reactive compensation system used for direct current motor-driven drilling machines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] The following is a set of active filtering and reactive power dynamic compensation devices, the actual record data of monitoring the power status of the grid side before and after the compensation is put into operation and not put into operation.

[0087] 1) Grid side apparent power

[0088] Three-phase total apparent power; 1765kVA before compensation and 1042kVA after compensation.

[0089] 2) Active power

[0090] The total active power is 951.9kW before compensation and 978.4kW after compensation.

[0091] 3) Grid-side reactive power

[0092] Three-phase total reactive power is 1486.0kvar before compensation and 357.7kvar after compensation.

[0093] 4) cosΦ

[0094] cosΦ=0.524 before A-phase compensation (cursor ordinate value Y1 on the lower left side: 524)

[0095] cosΦ=0.947 after phase A compensation (cursor ordinate value Y2 on the upper right side: 947)

[0096] cosΦ=0.574 before phase B compensation (Y1: 574)

[0097] cosΦ=0.939 after phase B compensa...

Embodiment 2

[0120] After the prototype trial production of the reactive power compensation and harmonic suppression device was completed, an industrial test was carried out in the well team of Chongqing Drilling Company. The test was mainly carried out under the condition of power supply from the grid. And the technical indicators and performance tests of the reactive power dynamic compensation device under various working conditions.

[0121] Below we conduct an economic analysis based on the actual situation on site, test data and data provided by equipment manufacturers:

[0122] (1) Basic data on the basis of economic analysis

[0123] (a) Technical parameters of CAT3512B diesel generator set: S=1771kVA, P=1240Kw, COSα=0.7; ZJ70-4500D drilling rig is generally equipped with 3-4 diesel generator sets;

[0124] (b) CAT3512B diesel generator set power and fuel consumption characteristics comparison table

[0125]

[0126] (c) The use of on-site generator sets: before the reactive po...

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Abstract

The invention relates to a full-active dynamic harmonic suppression and reactive compensation system used for direct current motor-driven drilling machines, which resolves the problems of lower power factor, unstable voltage, high harmonic content and the like of direct current drilling machines and alternating current drilling machines which utilizing grid electricity or a generator for power supply in the oil drilling and exploiting industry. The system combines the modern power electronic theory and actual application, utilizes an insulated gate bipolar transistor (IGBT) to serve as a power element to replace the existing capacitor and inductor frequently used in passive reactive compensation, utilizes a high speed digital signal processor (DSP) microprocessor for calculation and controls a device to provide needed reactive power and restraining harmonic current. The system can conduct quick and continuous compensation on reactive power and harmonic current with mutational capacity and can overcome the shortcoming that traditional reactive compensators and filters like an LC compensator are small in response speed, cannot accurately control compensation effect, and are apt to generate parallel connection resonance and switching oscillating with a power grid and the like. The device can effectively improve power grid stability, restrain harmonic current, improve system power factor and can be applied to petroleum, chemical engineering, railway, smelting, airports and the like in a large amount.

Description

technical field [0001] The present invention and a fully active dynamic harmonic suppression and reactive power compensation system specifically refer to a fully active dynamic harmonic suppression and reactive power compensation system for DC electric drilling rigs, especially in petroleum electric drilling rigs The operating fully active dynamic harmonic suppression and reactive power dynamic compensation device belongs to the technical field of power electronics. Background technique [0002] In the prior art, the primary main circuit of the DC electric drilling rig adopts SCR thyristor rectifier DC speed regulation (6-pulse converter), and the on-site load is mainly inductive equipment such as motors and transformers. The power demand is very large, especially when the motor is working at low speed and high current, the power factor of the system is usually only about 0.4. When the diesel generators are powered on site, often due to the limitation of the apparent power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/30Y02E40/40
Inventor 李国建
Owner SHANGHAI HUADUN GASOLINEEUM ENG TECH