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Research on Harmonic Suppression and Reactive Power Compension of Oil Drilling Rig Electrict Drive System

Author: ChaiLi
Tutor: DangCunLu
School: Lanzhou University of Technology
Course: Power Electronics and Power Drives
Keywords: Electric drive system Harmonic Analysis Harmonic suppression Reactive power compensation
CLC: TE926
Type: Master's thesis
Year: 2009
Downloads: 214
Quote: 1
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Abstract


Desert, marine and terrestrial environment where oil drilling equipment usually work less than in the public grid power station subsystem consists of several diesel generator sets and their corresponding control system power supply (power grid, oil rig system). Oil rig drilling equipment (winch, mud pump and dial, etc.) by the high-power AC or DC motor drive, the need to adjust the speed and torque control, according to the drilling process, usually the the VFD frequency control system or SCR DC speed system to meet the requirements of the drilling process. As we all know, the power electronic devices (the VFD frequency transmission and SCR DC drive) to bring the power system harmonic pollution, especially for small grid system of diesel generator sets, harmonic pollution problem will be more serious, and SCR electric drive system power factor is low, but also to the additional burden on small grid system, affecting the quality of power supply. Therefore, the oil rig electrical drive system for harmonic suppression and improve the power factor, it is particularly important. This thesis is the study and practice for this problem. In this paper, oil rig electrical drive system composition and working principle are introduced, and analyzed the causes and hazards of the SCR and VFD electric drive system harmonics and reactive power, combined with the research results at home and abroad, on oil rig electrical The drive system for harmonic suppression and reactive power compensation program, and apply it to the actual project. Oil rig electrical drive system typical multi-the harmonic source system, a detailed analysis of each harmonic source and synthetic superimposed multiple harmonic sources and calculation to determine the overall impact (voltage on the grid system distortion rate); the structure and characteristics of the SCR and VFD electric drive system, the SCR and VFD system harmonic suppression and reactive power compensation solutions, namely: SCR electric drive system, active filter dynamic reactive power compensation approach to eliminate harmonics and improve the power factor; VFD electric drive system, an active filter to eliminate harmonics can be. Oil rig SCR and VFD electric drive system harmonic analysis and calculations, harmonic suppression programs for both system selection and system optimization of the design basis. This selection of the active filter suitable for grid power supply system of the diesel generator set (rated voltage of 690V) to filter out the harmonics in the system structure, the use of a harmonic source configuration of an active filter method, mainly to solve the CT and PT connections, proved the system configuration, the filtering effect is good. The SCR electric drive system designed dynamic reactive power compensation device, verified by the measured data of the SCR electric drive system reactive compensation.

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CLC: > Industrial Technology > Oil and gas industry > Oil machinery and equipment and automation > Drilling machinery equipment > Circulatory system devices
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