CN203135442U - APF and TSF hybrid compensation device for electric drilling machine - Google Patents
APF and TSF hybrid compensation device for electric drilling machine Download PDFInfo
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Abstract
The utility model discloses an APF and TSF hybrid compensation device for an electric drilling machine. The APF and TSF hybrid compensation device 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 thyristor switched filter TST, and a control module of an active power filter APF. The filtering characteristics of the TSF are improved by utilizing the APF, so that when the TSF works in a combined manner, second to tenth 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, the control of the APF is facilitated, the cost of the whole set of devices is reduced, the problem of amplification of the harmonic currents occurring when the TSF is switched in a combined manner is effectively solved, and then the tasks of reactive compensation and harmonic suppression of the well site can be completed more safely and more effectively.
Description
Technical field
The utility model relates to a kind of mixed type dynamic reactive compensation device, especially a kind of active filter of the novel anti-resonance that is applicable to the well site power quality controlling and the mixed type compensation arrangement of thyristor switchable capacitor.
Background technology
For improving the automation and intellectuality of recovering the oil, the application of electric drilling machine in oilfield applications is universal day by day; At present in the oil drilling industry, electric drilling machine is divided into two kinds of the DC drive rig of AC-SCR-DC type and AC-VFD-AC AC frequency conversion electric drive rigs; Two kinds of electric drive rigs all exist: harmonic current is big, power factor low and the three-phase imbalance phenomenon; Wherein, present focus is the low problem of harmonic problem and power factor.
Because no matter dc powered motor or the AC-VFD-AC AC frequency conversion electric drive motor of AC-SCR-DC type all comprise three-phase commutation bridge in its electric propulsion system, it is a large amount of to cause like this flowing in the well site
Leading subharmonic current k is natural number, and for preventing that harmonic current from flowing into electrical network electrical network is constituted pollution, a kind of simple and effective compensation arrangement is thyristor switched filter TSFThyristor Switched Filter; TSF is deployed into state at certain harmonic resonance with capacitor and reactor, finishes the purpose of filtering harmonic wave, and general TSF often is designed to be no less than the form of three groups the filter parallel connection that is tuned in 5 times or 7 times or 11 times; When each group capacity of TSF is selected can guarantee that the power factor in well site is in more than 0.92 when suitable; When TSF controls when proper, it has and does not have switching, corresponding speed is fast, compensation capacity reaches good wave filtering effect greatly the characteristics of impacting; Be that TSF can satisfy the reactive power compensation in well site and the task that harmonic wave suppresses preferably; TSF type compensation arrangement is the leading equipment that is used for well site reactive power compensation and harmonic wave inhibition work now, but because its work is only to be to judge and drop into TSF and answer the switching combination according to the reactive requirement in well site, and do not consider the relations of distribution of harmonic current between well site electric power system and filter that well site harmonic wave nonlinear load produces; In addition, well site such as equipment such as winch, slush pump also can produce other subharmonic current except leading subharmonic when operation, and the high order bank of filters presents capacitive to the low-order harmonic electric current of flowing through, and in the time of so just may causing bank of filters work, certain subharmonic current is amplified; After certain subharmonic current was exaggerated, best may be that bank of filters detects the protection module action, and this time filter branch triggering signal is blocked, and will cause the TSF capacity to can not get effective utilization like this; Secondly not action of the detection protection module of possibility bank of filters causes the capacitor of filter branch or reactor to be burnt out, and makes hardware cost increase and TSF can not finish the well site compensation work reliably; The worst may be that the electric power system in well site is destroyed, and this loss that brings is imponderable often.
The high order bank of filters of the basic reason according to the harmonic current amplification---input shows capacitive to the low-order harmonic electric current of flowing through, and when TSF was designed to the form of 5 times, 7 times and 11 times parallel connections, it may be 2 ~ 10 times with the number of times of electrical network generation resonance.
In the middle of prior art, mainly contain following several parts of documents with the related content of present patent application.
Document one is to be applied on August 22nd, 2008 by Xi'an Baomei Electric Industry Co., Ltd., on May 20th, 2009 is disclosed, publication number is the Chinese invention patent application open file of CN201243204, the special-purpose reactive power compensation of electric drilling machine and harmonic suppression apparatus comparatively system introduce a kind of by three groups of filterings 5 times respectively, 7 times and the fixed filters group of high order harmonic component and the inductance TCRThyristor Controlled Reactor of one group of thyristor control, the static passive compensation device that thyristor-controlled reactor is formed, as shown in Figure 1, utilize thyristor-controlled reactor TCR to realize the purpose of dynamic passive compensation in this device, and then the power factor in raising well site, but in TCR when work, produce harmonic wave, and during this device work may with electrical network generation harmonic phenomena.
Document two is to be applied on May 27th, 2005 by Hunan University, on July 12nd, 2006 is disclosed, publication number is the Chinese invention patent of CN2796213, the mixed type high-power active filter has specifically been introduced a kind of structure that active power filter APFActive Power Filter is in parallel through the fundamental series resonance module of coupling transformer and fixed capacitor group, as shown in Figure 2; The mixed type compensation arrangement of this structure can overcome the APF capacity and reach the high shortcoming of cost greatly, but belong to the fixed capacity group with the filter of APF coupling, cause it when dynamic compensation is worked, need thyristor-controlled reactor TCR cooperating together, and this compensation arrangement is when no-load running, TCR operates in rated current, and no-load loss is big; In addition, because the introducing of first-harmonic resonance circuit makes the APF dc bus capacitor no longer have the exchange of first-harmonic energy with electrical network, cause the wayward of dc voltage.
Document three is disclosed the 25 days July in 2007 of application on July 31st, 2006 by Hunan University, publication number is the Chinese invention patent of CN2927445, the harmonic wave injection mixed active power filter, specifically introduced and a kind ofly formed by several groups of passive filter group and one group of active filter that are tuned in different frequency, and the structure that active filter is in parallel by coupling transformer and the first-harmonic resonance module of a filter branch wherein, as shown in Figure 3; This structure can make APF bear and be approximately zero fundamental voltage, be easy to reduce capacity and the cost of APF, but since the capacitor group can not switching, make it not be suitable for the violent dynamic compensation of picture this load fluctuation of electric drilling machine, the voltage control of while for the APF DC side of this harmonic wave injection mixed active power filter do not provide a solution.
Document four is to be applied on December 19th, 2007 by Hunan University, on June 18th, 2008 is disclosed, publication number is the Chinese invention patent of CN101202448, divide phase control method based on the harmonic wave of APF and SVC and Reactive-current General Compensation system and frequency division thereof, specifically introduced a kind of mechanical switching capacitance MSCMechanically Switched Capacitor that utilizes, the machinery switched capacitor, resonance injection type active filter APFActive Power Filter and thyristor-controlled reactor TCR combine separately, and MSC, the FCFixed Capacitor that TCR and APF are coupled with it, the fixed capacitor group partly constitutes SVCStatic Var Compensator, static reacance generator carries out idle and harmonic compensation, and APF cooperate FC improve device filter effect bucking-out system and use the control method of its frequency division phase-splitting, as shown in Figure 4; Be to adopt MSC and TCR to finish dynamic passive compensation in this system and the control method, and the response time of TCR is 60 ~ 100ms, this speed is relatively poor to the inhibition of voltage, and the more complicated as a result that combines of this MSC, pouring-in APF and TCR, be not suitable for the simple bucking-out system of this load configuration in well site.
Document five is Tan Tianyuan, Luo An, Tang Xin, the paper " development of the active Active Power Filter-APF of high-power parallel connection mixed type " that Tu Chunming was published on the 3rd phase in 2004 " Proceedings of the CSEE " mainly discloses when ignoring the grid side voltage distortion, the one phase equivalent circuit of parallel connection type hybrid active filter, and when being controlled to be according to the single-phase output voltage that Kirchhoff's second law KVL and the Kirchhoff's current law (KCL) KCL of circuit derives APF, the relation of the h subharmonic current amplitude that mains side h subharmonic current and nonlinear load produce, wherein i
ShH subharmonic current signal for mains side.But, the selection principle of k value when it does not provide control; In addition; harmonic current data in the document is elected the summation of all harmonic waves of all the other times except fundamental current as; this method is comparatively easy to the detection of harmonic current; but when the power supply grid side () when having harmonic voltage; and APF bears the harmonic voltage that the fundamental series resonance module is got by coupling transformer; and all subharmonic currents harmonic voltage corresponding with it that flows into APF multiplies each other; cause like this between APF and electric power system existing a value be all subharmonic energy add and energy exchange, be not easy to control the voltage of APF DC side.
Document six is Liu Dingguo, Luo An, handsome intelligence health is published in the paper " injection mixed active filter DC voltage control new problem and solution thereof " on the 30th phase in 2008 " Proceedings of the CSEE ", the injection mixed active filter mainly has been described when work, its dc voltage can not be realized by the closed-loop control to the inverter fundamental active current to being parallel with source inventer; It is the meritorious energy of harmonic wave that exchange between switching loss, line loss and the APF of APF module and the electrical network that explanation simultaneously causes the dc voltage factors of instability; The document proposes to select, optimize methods such as injection branch parameter and the controlled finishing circuit of DC side employing PWM by filter construction and guarantees the stable of dc voltage, as shown in Figure 5, this method has kept externally adds controlled rectification circuit and keeps the stable of dc voltage, and this will cause the complexity of compensation arrangement and the cost of device.
Therefore, the well site quality of power supply is improved and the active demand of electric energy-saving in order to satisfy, study a kind of can compensating well site voltage flicker, power factor, the cost effective compensating device that well site Harmonious Waves in Power Systems electric current is injected in inhibition that again can be safe, reliable and effective has bigger Practical significance and market value.
The utility model content
The purpose of this utility model is to avoid the deficiencies in the prior art and provides a kind of electric drilling machine with TSF and APF mixed type compensation arrangement, the phenomenon of when this device effectively prevents the TSF work in combination well site harmonic current being amplified, 2 ~ 10 subharmonic current amplitudes that the well site nonlinear load injects to the well site electric power system can be controlled in a set-point, be adopted injection circuit that the capacity of APF is reduced greatly simultaneously.
The technical scheme that the utility model adopts has: a kind of electric drilling machine comprises the electric quantity data acquisition module of passive part, active part, well site and compensation arrangement, the control module of thyristor switched filter TSF and the control module of active power filter APF with APF and TSF mixed type compensation arrangement.
Wherein said passive part is thyristor switched filter TSF, it is made up of the LC filter that four groups of dihedrals connect, wherein two groups are tuned in quintuple harmonics, one group is tuned in the seventh harmonic, one group is tuned in ten first harmonics, is parallel to the outlet side of well site main transformer secondary or well site generator by antiparallel thyristor valve; Described active part is active power filter APF, and inductance is passed through in its output
Electric capacity
After the filtering, the series resonance module of one group of five filter branch by three-phase coupling transformer and thyristor switched filter TSF
Be in parallel, wherein the no-load voltage ratio of coupling transformer is 2:1; The electric quantity data acquisition module of described well site and compensation arrangement comprises well site nonlinear-load side three-phase current detection module, the former limit of well site 600/380V three-phase current detection module, well site total load three-phase current detection module, first group of five filter branch three-phase current detection module of compensation arrangement, second group of five the filter branch three-phase current detection module in well site, well site seven filter branch three-phase current detection module, well site ten filter branch three-phase current detection module, 600V bus place, well site three-phase voltage detection module, the voltage detection module of first group of five filter branch three-phase fundamental series resonance unit and well site 10000/600V main transformer secondary three-phase current detection module; The control module of described thyristor switched filter TSF comprises the computing module of well site reactive requirement and the switching judge module of thyristor switched filter TSF; The control of described active power filter APF and detection module comprise the given module of well site mains side 2 ~ 10 subharmonic current amplitudes, the computing module of active power filter APF equiva lent impedance, the computing module of the given signal of active power filter APF three-phase output voltage, the PI adjustment module of the detection module of active power filter APF three-phase output voltage and active power filter APF three-phase output voltage.
The former limit of the well site 600/380V three-phase current detection module of the electric quantity data acquisition module of described well site and compensation arrangement, first group of five filter branch three-phase current detection module of compensation arrangement, second group of five the filter branch three-phase current detection module in well site, the signal of ten filter branch three-phase current detection of well site seven filter branch three-phase current detection module and well site module is input to the DSP control chip after the A/D conversion, to after the A/D conversion, be input to the DSP control chip with the signal of moment 600V bus place, well site three-phase voltage detection module simultaneously, calculate first-harmonic and the second harmonic signal value of each module in the inner process of DSP control chip based on the subharmonic detection algorithm of instantaneous reactive power, thereby calculate the single-phase fundamental resistance value of first group of five filter branch
, the single-phase fundamental resistance value of second group of five filter branch
, seven filter branch single-phase fundamental resistance values
, ten single-phase and wave impedance value z of filter branch
111And the corresponding first-harmonic single phase impedance value Z of well site household electricity load
Load1, aforesaid operations only when corresponding module is devoted oneself to work, is gathered once, in case calculate respective value, calculates 2 ~ 10 subharmonic resistance values of counterpart impedance again, and 2 ~ 10 subharmonic resistance values of each module are stored among the RAM of DSP control chip; The current signal that well site 10000/600V main transformer secondary three-phase current detection module is detected is input to the DSP control chip after the A/D conversion, the voltage signal that 600V bus place, well site three-phase voltage detection module is detected is input to after the A/D conversion in the DSP control chip simultaneously, and is inner through calculate in-phase voltage signal and current signal 2 times, and 3 signals based on the subharmonic detection algorithm of instantaneous reactive power at the DSP control chip
,
,
And
Thereby, calculate well site electric power system first-harmonic system impedance value Z
Sa1, and then calculate 2 ~ 10 subsystem resistance value Z
Sa2~ Z
Sa10, and this value is stored among the RAM of DSP control chip.
Described well site total load three-phase current detection module and the detected electric quantity signal of 600V bus place, well site three-phase voltage detection module calculate current well site reactive requirement through well site reactive requirement computing module, organize the capacity of filter again in conjunction with each, switching judge module through thyristor switched filter TSF, judge the filter that needs to drop into and make up, respectively organized the switching signal of thyristor switched filter TSF.
The three-phase current signal that described well site 10000/600V main transformer secondary three-phase current detection module detects is input to the DSP control chip after the A/D sampling, the single-phase voltage signal that 600V bus place, well site three-phase voltage detection module is detected is input to the DSP control chip after the A/D conversion simultaneously, calculates 2 ~ 10 subharmonic current signal i of well site mains side monophase current within it by the subharmonic detection algorithm based on instantaneous reactive power
Sh2-i
Sh10Same operation detection goes out 2 ~ 10 subharmonic current signal i that frequent nonlinear load correspondence produces mutually
H2-i
H10, with signal i
Sh2-i
Sh10Amplitude and the given module of well site mains side 2 ~ 10 subharmonic current amplitudes corresponding set-point relatively, binding signal i simultaneously
H2-i
H10And calculate 2 ~ 10 subharmonic impedance datas of each module that is stored among the DSP control chip RAM in the electric quantity data acquisition module of well site and compensation arrangement, calculate the equivalent impedance K of APF through the computing module of the active power filter APF of active power filter APF equiva lent impedance equiva lent impedance; The single-phase voltage signal that the three-phase voltage signal that the voltage detection module of first group of five filter branch three-phase fundamental series resonance unit is detected detects in conjunction with 600V bus place, well site three-phase voltage detection module is through detecting 2 ~ 10 subharmonic voltage signal v of this voltage signal based on the subharmonic detection algorithm of instantaneous reactive power
2-v
10, with the equivalent impedance K of signal v2-v10 binding signal ish2-ish10 and APF, obtain the given signal of active power filter APF three-phase voltage through the computing module of the given signal of active power filter APF three-phase output voltage
,
And
With signal
,
And
With the detected three-phase output voltage signal of the detection module of active power filter APF three-phase output voltage
,
,
After correspondence was made difference, the PI adjustment module output three-phase modulations ripple through active power filter APF three-phase output voltage compared three-phase modulations ripple and the triangular wave of fixing the switching signal that produces among the trigger pulse triggers active power filter APF.
Described a kind of electric drilling machine is in parallel by the first-harmonic resonance module of five times little filter branch of the capacity among coupling transformer and the thyristor switched filter TSF with active power filter APF in APF and the TSF mixed type compensation arrangement, and the switching principle of thyristor switched filter TSF is to drop into high order after throwing low order earlier, device is in case work, thereby with the certain work of the filter branch of active power filter APF coupling active power filter APF can be worked always, contain the combination of thyristor switched filter TSF switching simultaneously in the device and change judge module, the blockade unit of timing unit and active power filter APF triggering signal, when the switching combination of thyristor switched filter TSF changes, timing unit starts, timing length is 20 ~ 30ms, in timing course, the blockade unit is effective, active power filter APF is quit work, in case timing finishes, block and lost efficacy active power filter APF operate as normal.
Described a kind of electric drilling machine is as follows with the calculation process of the A equivalent resistance value K of the control of the active power filter APF in APF and the TSF mixed type compensation arrangement and the active power filter APF equiva lent impedance computing module in the detection module: the each harmonic current limit that A phase harmonic current signal ish2-ish10 amplitude and the given module of well site mains side 2 ~ 10 subharmonic currents is given is compared, judge current out-of-limit harmonic current number of times, with current out-of-limit all subharmonic currents each through following operation: in conjunction with the filter combination of current input, be stored in each filter branch among the dsp chip RAM and 2 ~ 10 subharmonic impedance datas and 2 ~ 10 subharmonic current signal ih2-ih10 of well site household electricity, press formula
, calculate make current subharmonic current control in the given module of well site mains side 2 ~ 10 subharmonic current amplitudes to the Kx value in the scope of its set-point, wherein Ish be the given module of well site mains side 2 ~ 10 subharmonic current amplitudes to the limit value to subharmonic current,
Be electric capacity in five filter branch
Corresponding harmonic impedance value, I
hThe k subharmonic current effective value that the current harmonic source that calculates for calculating well site total load three-phase current detection module produces, Z
ShBe well site system harmonic impedance value, z
LhFor the household electricity counterpart impedance of the corresponding load of current filter branch of devoting oneself to work and well site life exists
The parallel single-phase value of subharmonic impedance,
Be out-of-limit harmonic current number of times; With 2 ~ 10 subharmonic current intermediate values surpass the given module set-point of well site mains side 2 ~ 10 subharmonic current amplitudes get do not comprise 5 times harmonic current each through a computing, respectively obtain the equivalent impedance Kx of a corresponding active power filter APF, to getting maximum in all Kx values, with 1.2Kx as the final equivalent impedance K of APF.
Described a kind of electric drilling machine is as follows with the calculation process of the given signal of a phase voltage of the computing module of the control of the active power filter APF in APF and the TSF mixed type compensation arrangement and the given signal of active power filter APF three-phase output voltage in the detection module: the harmonic current signal ish2-ish10 of a phase is removed i
H5Corresponding time signal multiplication with the harmonic voltage signal vh2-vh10 of a phase and quadrature and, calculate the algebraical sum P of the active power that active power filter APF and well site electric power system exchange
H-5, its value is added that a correspondence is opened hangs loss and the meritorious value P of line loss
Lass1/3rd, will add and get negative back divided by current harmonic voltage quintuple harmonics voltage signal v
H5Effective value square, the value of obtaining B; Multiply by signal v with B
H5, add harmonic current signal i simultaneously
Sh2-i
Sh4And i
Sh6-i
Sh10, will add the active power filter APF equivalent impedance k that calculates with APF equiva lent impedance computing module with signal times, product is the given signal of a phase in the active power filter APF three-phase output voltage
The harmonic wave that the required reactive power in well site and most of nonlinear load produced when compared with prior art, the present invention utilized the main compensate for steady state of the big capacity of TSF; Utilize APF should be apt to the filtering characteristic of TSF, when making the TSF work in combination, 2 ~ 10 subharmonic currents control of injecting to the well site electric power system in set-point, thereby when preventing the different filter branch combination of TSF switching to the amplification of well site harmonic current; APF is by the first-harmonic resonance module structure in parallel of five filter branch of coupling transformer and TSF, make the capacity of APF very little, and then be beneficial to its control and reduce the cost of package unit, the problem that the harmonic current of the existence when TSF and APF co-ordination can low-cost, effectively solve TSF combination switching amplifies, and then can safer, the more effective task of finishing well site reactive power compensation and harmonic wave control.
Description of drawings
Fig. 1 is the improvement figure of the special-purpose reactive power compensation of prior art electric drilling machine and harmonic suppression apparatus compensation principle.
Fig. 2 is the electrical schematic diagram of prior art mixed type high-power active filter.
Fig. 3 is the electrical schematic diagram of prior art harmonic wave injection mixed active power filter.
Fig. 4 divides the electrical schematic diagram of comprehensive compensation system in the phase control method based on the harmonic wave of APF and SVC and Reactive-current General Compensation system and frequency division thereof for prior art.
Fig. 5 is the topology diagram of solution in prior art injection mixed active filter DC voltage control new problem and the solution thereof.
Fig. 6 is the topological structure electrical schematic diagram that a kind of electric drilling machine of the utility model is used TSF and APF mixed type compensation arrangement.
Fig. 7 for a kind of electric drilling machine of the utility model with TSF and APF mixed type compensation arrangement when five filter branch being with coupling transformer are devoted oneself to work and are ignored the electric power system harmonic voltage, to the single-phase equivalent model circuit theory diagrams of k subharmonic current.
Fig. 8 is the k subharmonic current computing block diagram based on instantaneous reactive power.
Fig. 9 is the TSF control block diagram that a kind of electric drilling machine of the utility model is used TSF and APF mixed type compensation arrangement.
Figure 10 is a kind of electric drilling machine of the utility model with the A phase triggering signal computing block diagram of APF in TSF and the APF mixed type compensation arrangement.
Figure 11 jointly controls block diagram for a kind of electric drilling machine of the utility model with TSF and APF in TSF and the APF mixed type compensation arrangement.
Figure 12 is the computing block diagram that a kind of electric drilling machine of the utility model is used the given signal of APF modules A phase voltage in TSF and the APF mixed type compensation arrangement.
Embodiment
Below in conjunction with description of drawings embodiment of the present utility model.
A kind of electric drilling machine TSF and APF mixed type compensation arrangement, comprise: passive part and active part, wherein, passive part is thyristor switched filter TSF, it is made up of the LC filter that four groups of dihedrals connect, wherein two groups are tuned in quintuple harmonics, one group is tuned in the seventh harmonic, one group is tuned in ten first harmonics, they are parallel to the outlet side of well site 10000/600 main transformer secondary or well site generator by antiparallel thyristor valve, its task provides the harmonic current of the required transient state reactive power in well site and the nonlinear load generation of the most of well site of filtering; Active part is active power filter APF, and inductance is passed through in its output
Electric capacity
After the filtering, the series resonance module of one group of five filter branch by three-phase coupling transformer and TSF
Be in parallel, wherein the no-load voltage ratio of coupling transformer is 2:1, and its task is only for improving the filtering characteristic of filter, when preventing TSF work the well site harmonic current amplified or with well site power supply system generation parallel resonance.
The electric quantity data acquisition module of well site and compensation arrangement comprises: well site nonlinear-load side three-phase current detection module 1, the former limit of well site 600/380V three-phase current detection module 2, well site total load three-phase current detection module 3, first group of five filter branch three-phase current detection module 4 of compensation arrangement, second group of five the filter branch three-phase current detection module 5 in well site, well site seven filter branch three-phase current detection module 6, well site ten filter branch three-phase current detection module 7,600V bus place, well site three-phase voltage detection module 8, the voltage detection module 9 of first group of five filter branch three-phase fundamental series resonance unit, well site 10000/600V main transformer secondary three-phase current detection module 10; Wherein, the detection signal of module 2, module 4, module 5, module 6, module 7 is input to the DSP control chip in conjunction with the signal of while die sinking piece 8 after the A/D conversion, inner through calculating first-harmonic and the second harmonic signal value of each module based on the subharmonic detection algorithm of instantaneous reactive power at the DSP control chip, organize the single-phase fundamental resistance value that compensates branch road thereby calculate each
,
,
With
And the first-harmonic single phase impedance value Zload1 that reaches well site household electricity load correspondence, impedance of fundamental frequency value according to each module calculates its 2 ~ 10 subharmonic resistance value, and it is stored among the RAM of DSP control chip, the voltage signal that the current signal binding modules 8 that module 10 is detected detects is input to after the A/D conversion in the DSP control chip, and is inner through calculate in-phase voltage signal and current signal 2 times, and 3 signals based on the subharmonic detection algorithm of instantaneous reactive power at the DSP control chip
,
,
And
Thereby, calculate well site electric power system first-harmonic system impedance value
, and then calculate 2 ~ 10 subsystem resistance value Z
Sa2 
~ Z
Sa10, and this value is stored among the RAM of DSP control chip.
The control module of thyristor switched filter TSF comprises the computing module 11 of well site reactive requirement, the switching judge module 12 of thyristor switched filter TSF, well site total load three-phase current detection module 3 and 600V bus place, well site three-phase voltage detection module 8 detected electric quantity signals calculate current well site reactive requirement through well site reactive requirement computing module 11, organize the capacity of filter again in conjunction with each, switching judge module 12 through thyristor switched filter TSF, judge the filter that needs to drop into and make up, respectively organized the switching signal of thyristor switched filter TSF.
The control of active power filter APF and detection module comprise the given module 13 of well site mains side 2 ~ 10 subharmonic current amplitudes, the computing module 14 of active power filter APF equiva lent impedance, the computing module 15 of the given signal of active power filter APF three-phase output voltage, the PI adjustment module 17 of the detection module 16 of active power filter APF three-phase output voltage and active power filter APF three-phase output voltage; The three-phase current signal that well site 10000/600V main transformer secondary three-phase current detection module 10 detects is input to the DSP control chip after the A/D sampling, the single-phase voltage signal that 600V bus place, well site three-phase voltage detection module 8 is detected is input to the DSP control chip after the A/D conversion simultaneously, calculates 2 ~ 10 subharmonic current signal i of well site mains side monophase current within it by the subharmonic detection algorithm based on instantaneous reactive power
Sh2-i
Sh10Same operation detection goes out 2 ~ 10 subharmonic current signal i that frequent nonlinear load correspondence produces mutually
H2-i
H10, with signal i
Sh2-i
Sh10Amplitude and module 13 corresponding set-point relatively, binding signal i simultaneously
H2-i
H10And calculate 2 ~ 10 subharmonic impedance datas of each module that is stored among the DSP control chip RAM in the electric quantity data acquisition module of well site and compensation arrangement, calculate the equivalent impedance K of active power filter APF through the computing module 14 of active power filter APF equiva lent impedance; The single-phase voltage signal that the three-phase voltage signal that the voltage detection module 9 of first group of five filter branch three-phase fundamental series resonance unit is detected detects in conjunction with 600V bus place, well site three-phase voltage detection module 8 is through detecting 2 ~ 10 subharmonic voltage signal v of this voltage signal based on the subharmonic detection algorithm of instantaneous reactive power
2-v
10, with signal v
2-v
10Binding signal i
Sh2-i
Sh10And the equivalent impedance K of active power filter APF, obtain the given signal of active power filter APF three-phase voltage through the computing module 15 of the given signal of active power filter APF three-phase output voltage
,
And
With signal
,
And
With module 16 detected three-phase output voltage signals
,
,
After correspondence was made difference, the PI adjustment module 17 output three-phase modulations ripples through active power filter APF three-phase output voltage compared three-phase modulations ripple and the triangular wave of fixing the switching signal that produces among the trigger pulse triggers active power filter APF.
Active power filter APF is in parallel by the first-harmonic resonance module of five times little filter branch of the capacity among coupling transformer and the thyristor switched filter TSF, and the switching principle of thyristor switched filter TSF is to drop into high order after throwing low order earlier, assurance device is in case work, thereby with the certain work of the filter branch of active power filter APF coupling active power filter APF can be worked always, contain the combination of thyristor switched filter TSF switching simultaneously in the device and change judge module, the blockade unit of timing unit and active power filter APF triggering signal, when the switching combination of thyristor switched filter TSF changes, timing unit starts, timing length is 20 ~ 30ms, in timing course, the blockade unit is effective, brilliant active power filter APF is quit work, in case timing finishes, block and lost efficacy active power filter APF operate as normal.
The calculation process of the A equivalent resistance value K of the active power filter APF equiva lent impedance computing module 14 in the control of active power filter APF and the detection module is as follows: with A harmonic current signal i mutually
Sh2-i
Sh10The given module 13 given each harmonic current limit of amplitude and well site mains side 2 ~ 10 subharmonic currents are compared, judge current out-of-limit harmonic current number of times, with current out-of-limit all subharmonic currents each through following operation: in conjunction with the filter combination of current input, be stored in each filter branch among the DSP control chip RAM and 2 ~ 10 subharmonic impedance datas and 2 ~ 10 subharmonic current signal i of well site household electricity
H2-i
H10, press formula
, calculating is controlled in module 13 to the K in the scope of its set-point current subharmonic current
xValue, wherein I
ShBe 13 pairs of limit values of giving subharmonic current of module,
Be electric capacity in five filter branch
Corresponding harmonic impedance value, Ih is that the current harmonic source that computing module 3 calculates produces
The subharmonic current effective value, Z
ShBe well site system harmonic impedance value, Z
LhFor the household electricity counterpart impedance of the corresponding load of current filter branch of devoting oneself to work and well site life exists
The parallel single-phase value of subharmonic impedance,
Be out-of-limit harmonic current number of times; With 2 ~ 10 subharmonic current intermediate values surpass module 13 set-points get do not comprise 5 times harmonic current each through a computing, respectively obtain the equivalent impedance K of a corresponding active power filter APF
x, to all K
xGet maximum in the value, with 1.2K
xAs the final equivalent impedance K of active power filter APF.
The calculation process of the given signal of a phase voltage of the computing module 15 of the given signal of active power filter APF three-phase output voltage in the control of active power filter APF and the detection module is as follows: a harmonic current signal ish2-ish10 is mutually removed
Harmonic voltage signal v with a phase
H2-v
H10Corresponding signal multiplication and quadrature and, calculate the algebraical sum P of the active power that active power filter APF and well site electric power system exchange
H-5, its value is added that a correspondence is opened hangs loss and the meritorious value P of line loss
Lass1/3rd, will add and get negative back divided by current harmonic voltage quintuple harmonics voltage signal v
H5Effective value square, the value of obtaining B; Multiply by signal v with B
H5, add harmonic current signal i simultaneously
Sh2-i
Sh4And i
Sh6-i
Sh10, will add the active power filter APF equivalent impedance K that calculates with active power filter APF equiva lent impedance computing module 14 with signal times, product is the given signal of a phase in the active power filter APF three-phase output voltage
As the embodiment of a kind of electric drilling machine of the present invention with TSF and APF mixed type compensation arrangement, topological structure electrical schematic diagram as shown in Figure 6 specifically discloses the circuit topological structure of electric drilling machine with thyristor switched filter TSF and active power filter APF mixed type compensation arrangement; Consider by 5 times, the thyristor switched filter TSF of 7 times and 11 times filter branch compositions is when the combination switching of different branch, harmonic current amplifies or the number of times of generation resonance only may be 2 ~ 10 times, in conjunction with present hybrid injection type active power filter APF in the application technology in transformer station reactive power compensation field and the actual load situation in well site, adopt a kind of thyristor switched filter TSF that is combined with direct hanging type thyristor switched filter TSF by transformer coupled formula active power filter APF and active power filter APF mixed type compensation arrangement with the compensation of the idle and harmonic wave that improves the well site, the reactive power that it utilizes the former the main offsetting well of big capacity place to need, and carry out harmonic compensation, and utilize the former than the rapidity of low capacity the possible amplified current during to thyristor switched filter TSF combination switching make fast reaction, make 2 ~ 10 subharmonic currents control that the well site nonlinear load injects to electric power system in a set-point by suitable control, when preventing thyristor switched filter TSF work to the amplification of well site harmonic current; Because coupling transformer is in parallel with the first-harmonic resonance circuit of filter branch, the capacity of active power filter APF is reduced greatly, thereby be beneficial to the cost of control device simultaneously.
When active power filter APF being controlled to be a harmonic current that injects to electric power system with the well site load and being the harmonic voltage source of controlled quentity controlled variable, document 5 has provided that the well site nonlinear load produces k time harmonic current i when ignoring well site supply power voltage distortion
Hk, the k subharmonic current i that injects to electrical network of well site load
Shk, the relation between control no-load voltage ratio k and each the module k subharmonic impedance, this for the k subharmonic current control that realizes the well site load is injected to electrical network in given range, ask the k value that foundation is provided; The subharmonic detection algorithm based on instantaneous reactive power as shown in Figure 8 provides theoretical foundation for effectively detecting each harmonic voltage and harmonic current signal.
Control the equivalent impedance k of the active power filter APF in given range for trying to achieve the k subharmonic current value that well site load phase electrical network is injected, must try to achieve the k subharmonic current that nonlinear load produces, the k subharmonic impedance of the current household electricity correspondence in well site, the k subharmonic resistance value of well site electric power system reach the k subharmonic impedance when the switching combination of pre-filter; Utilization can conveniently be tried to achieve the k subharmonic current that nonlinear load produces based on the frequency division computational algorithm of instantaneous reactive power; And the k subharmonic impedance that the switching of working as pre-filter makes up, can be by utilizing the voltage sensor senses phase voltage signal respectively
, utilize current sensor to detect corresponding phase current signal
,
,
, will
And
,
,
Utilization calculates corresponding first-harmonic and 2 rd harmonic signal based on the frequency division computational algorithm of instantaneous reactive power, and then calculates corresponding impedance of fundamental frequency value
,
,
And
Consider, filter branches exists electric capacity and inductance simultaneously, so detect first-harmonic and second harmonic signal, try to achieve first-harmonic and second harmonic resistance value, contrast its imaginary part, what obtain inductance and electric capacity respectively organizes impedance of fundamental frequency, and then obtains k subharmonic resistance value separately, finally calculates the k subharmonic resistance value in parallel of switching combination; The k subharmonic resistance value that well site household electricity load is corresponding can be by detection three-phase current and the single-phase voltage signal of detection module 2 and module 8, the subharmonic detection algorithm based on instantaneous reactive power that it is shown in Figure 8 is tried to achieve, fundamental voltage value and fundamental current value, and then try to achieve the impedance of fundamental frequency value of well site household electricity
, and then obtain k subharmonic resistance value
When ignoring the distortion of well site supply voltage source, the harmonic voltage content of well site supply power voltage should be the k subharmonic current that flows through and the product of k subharmonic resistance value thereof, therefore can be with module 10 detected three-phase current signals and module 8 detected single-phase voltage signals through algorithm shown in Figure 8, calculate the second harmonic current that the well site system impedance flows through, and the second harmonic voltage at two ends, and then calculate its second harmonic resistance value, thereby obtain the impedance of fundamental frequency value of well site electric power system, and then obtain its k subharmonic resistance value; Ignore load variations the well site supply system impedance is worth influence, and consider that well site household electricity load harmonic impedance value changes the influence of K value very little, said process only need calculate one time, in case calculate 2 ~ 10 subharmonic resistance values of each module, just it be stored among the RAM of DSP control chip and call a next time.
As shown in Figure 9, when electric drilling machine is worked with APF and TSF mixed type compensation arrangement, gather the signal with module 3 and module 8 in real time, and module 11 is tried to achieve current well site reactive requirement
, judge the switching signal of each branch road in conjunction with the capacity of each group filter branch through module 12 simultaneously, and utilize it to trigger corresponding thyristor valve, filter branch is devoted oneself to work.
As shown in figure 11, the switching signal of respectively organizing thyristor switched filter TSF that module 18 real-time detection modules 12 calculate, in case detecting the combination of filter branch switching changes, internal clocking unit module 19 opens timing, timing length is 20 ~ 30ms, in this timing length, blocking the three-phase PWM triggering signal of 20 couples of active power filter APF of unit module module blocks, active power filter APF is quit work, to prevent the overload of active power filter APF in thyristor switched filter TSF switching process, increase the fail safe of compensation arrangement associated working.
As shown in figure 10, the given signal of the A phase output voltage of the active power filter APF that calculates of module 15
With module 16 detected A phase input voltages
Compare, after module 17, obtain modulation signal, this modulation signal and high frequency triangle wave are obtained the pwm signal of the A phase switching tube of active power filter APF after relatively; Same method can get B mutually with C PWM triggering signal mutually; When the three-phase triggering signal is failure to actuate in module 20, trigger the corresponding switching tube of active power filter APF through drive circuit, it is devoted oneself to work.
Main problem of injection mixed active power filter APF is exactly the difficult control of active power filter APF dc capacitor voltage, and dc capacitor voltage is stable most important for active power filter APF reliably working; Document 6 points out that causing the reason of dc capacitor voltage fluctuation is that active power filter APF bears the harmonic wave dividing potential drop by the first-harmonic resonance module that coupling transformer links to each other, and its interchange effluent is crossed harmonic current, corresponding subharmonic voltage and current integration effect, produce and time humorous corresponding active power mutually, in addition switching loss and line loss in addition; When switching frequency and switching characteristic fixedly the time, switching loss can be thought a normal value, and fixes and the characteristic of circuit fixedly the time in line length, and line loss also can be thought a normal value, with switching loss and line loss as a normal value p
LassThe time, the destabilizing factor that influences the dc capacitor voltage fluctuation is the each harmonic active power loss value between active power filter APF interchange side and the well site electric power system; For realizing the stable of dc capacitor voltage, the present invention adopts into method shown in Figure 12, module 10 detected three-phase voltage signal binding modules 8 are detected single-phase voltage signal in the three-phase signal, calculate harmonic signal i in the A phase current signal through algorithm shown in Figure 8
Sh2~ i
Sh4And i
Sh6~ i
Sh10, module 9 detected three-phases are pressed signal voltage signal combination module 8 detected single-phase voltage signals, calculate the harmonic signal v of 9 kinds of A phase voltage signals of module through algorithm shown in Figure 8
A2~ v
A10, with harmonic current signal i
Sh2~ i
Sh4And i
Sh6~ i
Sh10And harmonic signal v
A2~ v
A10In corresponding subharmonic amount multiply each other, and very little one
Time quadrature and, obtain harmonic energy and P except quintuple harmonics
H-5Suppose loss P
LassMean allocation between three-phase is used P
H-5With P
Lass/ 3 are poor P, with P divided by harmonic signal v
A5Square; To discuss B and harmonic signal v
A5, the K value of taking advantage of module 14 to calculate again, will amass do negative after, add harmonic signal i
Sh2~ i
Sh4And i
Sh6~ i
Sh10With the product signal of K value, always add be active power filter APF in the A given signal of output voltage mutually
Claims (5)
1. an electric drilling machine is characterized in that: comprise the electric quantity data acquisition module of passive part, active part, well site and compensation arrangement, the control module of thyristor switched filter TSF and the control module of active power filter APF with APF and TSF mixed type compensation arrangement; Passive part is thyristor switched filter TSF, it is made up of the LC filter that four groups of dihedrals connect, wherein two groups are tuned in quintuple harmonics, one group is tuned in the seventh harmonic, one group is tuned in ten first harmonics, is parallel to the outlet side of well site main transformer secondary or well site generator by antiparallel thyristor valve; Active part is APF, and inductance is passed through in its output
Electric capacity
After the filtering, the series resonance module of one group of five filter branch by three-phase coupling transformer and thyristor switched filter TSF
Be in parallel, wherein the no-load voltage ratio of coupling transformer is 2:1; The electric quantity data acquisition module of well site and compensation arrangement comprises well site nonlinear-load side three-phase current detection module, the former limit of well site 600/380V three-phase current detection module, well site total load three-phase current detection module, first group of five filter branch three-phase current detection module of compensation arrangement, second group of five the filter branch three-phase current detection module in well site, well site seven filter branch three-phase current detection module, well site ten filter branch three-phase current detection module, 600V bus place, well site three-phase voltage detection module, the voltage detection module of first group of five filter branch three-phase fundamental series resonance unit and well site 10000/600V main transformer secondary three-phase current detection module; The control module of thyristor switched filter TSF comprises the switching judge module of thyristor switched filter TSF; The control of active power filter APF and detection module comprise the PI adjustment module of detection module and the active power filter APF three-phase output voltage of active power filter APF three-phase output voltage.
2. a kind of electric drilling machine according to claim 1 is with APF and TSF mixed type compensation arrangement, it is characterized in that: the former limit of the well site 600/380V three-phase current detection module of the electric quantity data acquisition module of well site and compensation arrangement, first group of five filter branch three-phase current detection module of compensation arrangement, second group of five the filter branch three-phase current detection module in well site, the signal of ten filter branch three-phase current detection of well site seven filter branch three-phase current detection module and well site module is input to the DSP control chip after the A/D conversion, to after the A/D conversion, be input to the DSP control chip with the signal of moment 600V bus place, well site three-phase voltage detection module simultaneously, calculate first-harmonic and the second harmonic signal value of each module in the inner process of DSP control chip based on the subharmonic detection algorithm of instantaneous reactive power, thereby calculate the single-phase fundamental resistance value of first group of five filter branch
, the single-phase fundamental resistance value of second group of five filter branch
, seven filter branch single-phase fundamental resistance values
, ten single-phase and wave impedance value Z of filter branch
111And the corresponding first-harmonic single phase impedance value Z of well site household electricity load
Load1, aforesaid operations only when corresponding module is devoted oneself to work, is gathered once, in case calculate respective value, calculates 2 ~ 10 subharmonic resistance values of counterpart impedance again, and 2 ~ 10 subharmonic resistance values of each module are stored among the RAM of DSP control chip; The current signal that well site 10000/600V main transformer secondary three-phase current detection module is detected is input to the DSP control chip after the A/D conversion, the voltage signal that 600V bus place, well site three-phase voltage detection module is detected is input to after the A/D conversion in the DSP control chip simultaneously, and is inner through calculate in-phase voltage signal and current signal 2 times, and 3 signals based on the subharmonic detection algorithm of instantaneous reactive power at the DSP control chip
,
,
And
Thereby, calculate well site electric power system first-harmonic system impedance value Z
Sa1, and then calculate 2 ~ 10 subsystem resistance value Z
Sa2~ Z
Sa10, and this value is stored among the RAM of DSP control chip.
3. a kind of electric drilling machine according to claim 1 is with APF and TSF mixed type compensation arrangement, it is characterized in that: calculate current well site reactive requirement by well site total load three-phase current detection module and the detected electric quantity signal of 600V bus place, well site three-phase voltage detection module, organize the capacity of filter again in conjunction with each, switching judge module through thyristor switched filter TSF, judge the filter that needs to drop into and make up, respectively organized the switching signal of thyristor switched filter TSF.
4. a kind of electric drilling machine according to claim 1 is with APF and TSF mixed type compensation arrangement, it is characterized in that: the three-phase current signal that well site 10000/600V main transformer secondary three-phase current detection module detects is input to the DSP control chip after the A/D sampling, the single-phase voltage signal that 600V bus place, well site three-phase voltage detection module is detected is input to the DSP control chip after the A/D conversion simultaneously, calculates 2 ~ 10 subharmonic current signal i of well site mains side monophase current within it by the subharmonic detection algorithm based on instantaneous reactive power
Sh2-i
Sh10Same operation detection goes out 2 ~ 10 subharmonic current signal i that frequent nonlinear load correspondence produces mutually
H2-i
H10, with signal i
Sh2-i
Sh10Amplitude and corresponding set-point relatively, binding signal i simultaneously
H2-i
H10And calculate 2 ~ 10 subharmonic impedance datas of each module that is stored among the DSP control chip RAM in the electric quantity data acquisition module of well site and compensation arrangement, calculate the equivalent impedance K of active power filter APF; The single-phase voltage signal that the three-phase voltage signal that the voltage detection module of first group of five filter branch three-phase fundamental series resonance unit is detected detects in conjunction with 600V bus place, well site three-phase voltage detection module is through detecting 2 ~ 10 subharmonic voltage signal v of this voltage signal based on the subharmonic detection algorithm of instantaneous reactive power
2-v
10, with signal v
2-v
10Binding signal i
Sh2-i
Sh10And the equivalent impedance K of active power filter APF, with the given signal of three-phase voltage
,
And
With the detected three-phase output voltage signal of the detection module of active power filter APF three-phase output voltage
,
,
After correspondence was made difference, the PI adjustment module output three-phase modulations ripple through active power filter APF three-phase output voltage compared three-phase modulations ripple and the triangular wave of fixing the switching signal that produces among the trigger pulse triggers active power filter APF.
5. a kind of electric drilling machine according to claim 1 is with APF and TSF mixed type compensation arrangement, it is characterized in that: described a kind of electric drilling machine is in parallel by the first-harmonic resonance module of five times little filter branch of the capacity among coupling transformer and the TSF with active power filter APF in APF and the TSF mixed type compensation arrangement, and the switching principle of thyristor switched filter TSF is to drop into high order after throwing low order earlier, device is in case work, thereby with the certain work of the filter branch of active power filter APF coupling active power filter APF can be worked always, contain the combination of thyristor switched filter TSF switching simultaneously in the device and change judge module, the blockade unit of timing unit and active power filter APF triggering signal, when the switching combination of thyristor switched filter TSF changes, timing unit starts, timing length is 20 ~ 30ms, in timing course, the blockade unit is effective, active power filter APF is quit work, in case timing finishes, block and lost efficacy active power filter APF operate as normal.
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| CN2012200972673U CN203135442U (en) | 2012-03-15 | 2012-03-15 | APF and TSF hybrid compensation device for electric drilling machine |
| CN201210068168.7A CN102593848B (en) | 2012-03-15 | 2012-03-15 | APF and TSF hybrid compensation device for electric rig |
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| CN2012200972673U CN203135442U (en) | 2012-03-15 | 2012-03-15 | APF and TSF hybrid compensation device for electric drilling machine |
| CN201210068168.7A CN102593848B (en) | 2012-03-15 | 2012-03-15 | APF and TSF hybrid compensation device for electric rig |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102593848A (en) * | 2012-03-15 | 2012-07-18 | 东营爱特机电技术有限责任公司 | APF and TSF hybrid compensation device for electric rig |
| CN105811419A (en) * | 2016-04-25 | 2016-07-27 | 哈尔滨理工大学 | Control method for accurately restraining power grid harmonics |
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| CN201260080Y (en) * | 2008-08-29 | 2009-06-17 | 东莞市友美电源设备有限公司 | Device for passive compensation and harmonic wave control for intelligent electric power system |
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| CN102593848B (en) * | 2012-03-15 | 2014-08-27 | 东营爱特机电技术有限责任公司 | APF and TSF hybrid compensation device for electric rig |
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|---|---|---|---|---|
| CN102593848A (en) * | 2012-03-15 | 2012-07-18 | 东营爱特机电技术有限责任公司 | APF and TSF hybrid compensation device for electric rig |
| CN102593848B (en) * | 2012-03-15 | 2014-08-27 | 东营爱特机电技术有限责任公司 | APF and TSF hybrid compensation device for electric rig |
| CN105811419A (en) * | 2016-04-25 | 2016-07-27 | 哈尔滨理工大学 | Control method for accurately restraining power grid harmonics |
| CN105811419B (en) * | 2016-04-25 | 2018-08-21 | 哈尔滨理工大学 | A kind of accurate control method for inhibiting mains by harmonics |
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| CN108879711A (en) * | 2018-06-12 | 2018-11-23 | 广西大学 | A kind of single-phase reactive power continuous regulating mechanism of low pressure and method |
| CN108879711B (en) * | 2018-06-12 | 2022-11-22 | 广西大学 | Low-voltage single-phase reactive power continuous adjusting device and method |
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| CN102593848A (en) | 2012-07-18 |
| CN102593848B (en) | 2014-08-27 |
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