Composite circuit integrating rectification, active power filtering and energy feedback braking functions

An energy feedback, composite circuit technology, applied in AC network to reduce harmonics/ripple, reactive power compensation, harmonic reduction devices, etc., can solve the problems of reduced equipment utilization, high cost of fully-controlled rectification solutions, and achieve energy saving High efficiency, improve energy utilization, save the effect of braking resistor

Inactive Publication Date: 2015-09-02
江苏同芯电气科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the feedback braking power is usually about 40% of the traction power, the utilization rate of the equipment is reduced, and the cost of the fully controlled rectification scheme

Method used

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  • Composite circuit integrating rectification, active power filtering and energy feedback braking functions
  • Composite circuit integrating rectification, active power filtering and energy feedback braking functions
  • Composite circuit integrating rectification, active power filtering and energy feedback braking functions

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with specific embodiments.

[0027] Considering that there are a large number of power electronic devices in the drilling platform, and these devices will generate a large number of harmonics, in order to improve the power quality of the grid, active power filters must be used. But at the same time, there are a large number of winch equipment in the power grid. During the deceleration process of these equipment, the winch is in the state of power generation. The electricity sent out is fed back to the DC circuit after full-wave rectification by the freewheeling diode connected in reverse parallel with the IGBT tube, so that the DC voltage rises, which will damage the equipment on the DC bus. In order to solve these two main problems in the power grid of the drilling rig platform, an active filtering and energy feedback braking structure is adopted.

[0028] Such as image 3 As shown, the composite ci...

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Abstract

The invention discloses a composite circuit integrating rectification, active power filtering and energy feedback braking functions, which comprises a rectification unit, an active power filtering and reactive power compensation unit and a clamping circuit, wherein the rectification unit and the active power filtering and reactive power compensation unit are directly connected at an alternating current side, the rectification unit and the active power filtering and reactive power compensation unit are connected at a direct current side through the clamping circuit, and the clamping circuit is connected between the active power filtering and reactive power compensation unit and a DC bus and provides a circuit for feeding energy back to a power grid through an active power filtering unit from a braking load. The composite circuit disclosed by the invention can carry out good compensation on harmonic current in a power grid of a drilling platform, an overvoltage effect generated when a winch drops is also solved, the feedback load brakes energy to the power grid, and the energy-saving efficiency is high.

Description

technical field [0001] The invention relates to a rectification, active filtering and energy feedback braking circuit for an oil drilling platform (including other lifting loads, hoist loads, etc.), and belongs to the technical field of electric harmonic suppression and energy feedback braking. Background technique [0002] At present, my country uses a large number of electric drive drilling rigs in oil drilling and production projects, and the power equipment of oil drilling rig systems is mainly provided by diesel generator sets or public power grids. When the public power grid is used for power supply, the use of a large number of nonlinear electronic devices such as inverters, rectifiers and various switching power supplies causes a large number of harmonics in the 600V power grid system, thereby affecting other electrical equipment on the 600V power grid (such as lines , generators and well site lighting) bring adverse effects, and increase harmonic and reactive power ...

Claims

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Application Information

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IPC IPC(8): H02J3/01H02J3/18H02J3/38
CPCY02E40/30Y02E40/40
Inventor 刘韬周细文章辉谈浩楠
Owner 江苏同芯电气科技有限公司
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