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

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 ...

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 is also higher than that of the uncontrolled rectification plus a small amount of APF scheme, and the uncontrolled rectification is more reliable than the fully controlled rectification higher

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