APF and TSF hybrid compensation device for electric rig

Abstract

The invention discloses an active power filter (APF) and thyristor switched filter (TSF) hybrid compensation device for an electric rig, which comprises a passive part, an active part, an electric quantity data acquisition module of a well site and the compensation device, a control module of a TST, and a control module of an APF. The filtering characteristics of the TSF are improved by utilizing the APF, so that when the TSF works in a combined manner, 2 to 10 times of harmonic currents injected into a power supply system of the well site are controlled within a given value, and the harmonic currents of the well site are prevented from being amplified when different filtering branches of the TSF are switched in a combined manner; and by adopting the structure that the APF is connected in parallel with a fundamental resonance module of a fifth filtering branch of the TSF through a coupling transformer, the capacity of the APF is very small, so that the APF is beneficially controlled, the cost of the whole set of device is reduced, the problem of overlarge harmonic currents occurring when the TSF is switched in a combined manner is effectively solved, and then the tasks of reactive compensation and harmonic elimination of the well site can be completed more safely and more effectively.

Description

technical field [0001] The invention relates to a hybrid dynamic reactive power compensation device, in particular to a novel hybrid compensation device of an anti-resonance active filter and a thyristor switching capacitor, which is suitable for power quality control at a well site. Background technique [0002] In order to improve the automation and intelligence of oil production, the application of electric drilling rigs in the oil field industry is becoming more and more popular; at present, in the oil drilling industry, electric drilling rigs are divided into AC-SCR-DC type direct current drive drilling There are two types of drive drilling rigs; both electric drive drilling rigs have large harmonic current, low power factor and three-phase imbalance; among them, the current focus is on harmonic problems and low power factor problems. [0003] Because no matter AC-SCR-DC type DC drive motor or AC-VFD-AC AC variable frequency electric drive motor, its electric power syst...

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Problems solved by technology

[0009] Document 4 is a Chinese invention patent filed by Hunan University on December 19, 2007 and published on June 18, 2008. The publication number is CN101202448. The harmonic and reactive power comprehensive compensation system based on APF and SVC and its frequency division The phase-splitting control method specifically introduces a combination of mechanically switched capacitor MSC Mechanically Switched Capacitor, mechanically switched capacitor, separate resonant injection active filter APFActive Power Filter and thyristor controlled reactor TCR, while MSC, TCR and APF The FFCixed Capacitor coupled with it, the fixed capacitor bank part constitutes the SVCStatic Var Compensator, the static var generator performs reactive power and harmonic compensation, and the APF cooperates with the FC to improve the filtering effect of the device and the frequency division and phase division of the compensation system control methods such as Figure 4 As shown; in this system and control method, MSC and TCR are used to complete dynamic reactive power compensation, and the response time of TCR is 60~100ms, which has a poor suppression effect on voltage. The result of the combination of TCR and TCR is more complicated, and it is not suitable for the compensation system with simple load structure on the well site.

[0010] The fifth document is Tan Tianyuan, Luo An, Tang Xin, and Tu Chunming's paper "Development of High Power Parallel Hybrid Active Active Power Filter" published in the 3rd issue of "Chinese Journal of Electrical Engineering" in 2004. When the voltage distortion on the grid side is ignored, the single-phase equivalent circuit of the parallel hybrid active filter, and the single-phase output of the APF is derived from the circuit's Kirchhoff's voltage law KVL and Kirchhoff's current law KCL Voltage control is , power side Subharmonic currents and non-linear loads generated by Subharmonic current amplitude relationship, where for the power side subharmonic current signal; however, it does not give control when In addition, the harmonic current data in this document is selected as the sum of all other harmonics except the fundamental current. This method is relatively simple for the detection of harmonic current, but when the When there is a harmonic voltage, the APF bears the harmonic voltage shared by the fundamental series resonant module through the coupling transformer, and all the sub-harmonic currents flowing into the APF are multiplied by their corresponding harmonic voltages, which leads to an existence between the APF and the power supply system. One value is the energy exchange of the sum of all sub-harmonic energies, it is not easy to control the voltage on the DC side of the APF

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