CN1059625A - Capacitor phase-shift triggered current converter - Google Patents
Capacitor phase-shift triggered current converter Download PDFInfo
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- CN1059625A CN1059625A CN 91109034 CN91109034A CN1059625A CN 1059625 A CN1059625 A CN 1059625A CN 91109034 CN91109034 CN 91109034 CN 91109034 A CN91109034 A CN 91109034A CN 1059625 A CN1059625 A CN 1059625A
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Abstract
A kind of capacitive character phase shift of the present invention triggers the AC-DC convertor assembly of control, its structure is a 2N zero a formula current transformer mutually, for three phase network, this current transformer is 6 zero formula mutually, the converter switches element is the controlled shutoff of controlled unblank, and the phase shift direction is opposite with traditional triode thyristor three-phase full-controlled bridge, is ° to move left to α=-150 ° from α=0, this negative sign representative moves to left, and-60 °≤α≤0 ° is the controlled rectification operating state.-150 °≤α＜-60 ° are controlled inversions or treat inverter mode.Because the phase shift direction moves to left,, realized producing the purpose of leading reactive power so the phase place of current transformer current first harmonics is leading supply power voltage of the same name.
Description
The invention belongs to a kind of phase shift and trigger the AC-DC current transformer of controlling, it is adjustable, and direct current is exported the dc motor variable voltage control.
The switch element of existing AC-DC current transformer all is common thyristor, because the shutoff of triode thyristor can only lean on nature cutout or switch element negative electrode to the reverse voltage of anode to force shutoff, from the three-phase voltage oscillogram, have only when α＞0 °, force the condition of turn-off reversal voltage just to possess, therefore, the phase shift range of triode thyristor AC-DC phase shift trigger converter is without exception without exception all is α＞0 °.Like this, from power supply, triode thyristor AC-DC current transformer to power supply grid always show as the perception.
The present invention is intended to design a kind of capacitor phase-shift triggered current converter, and it can provide leading reactive power to the supply and AC electrical network when speed-regulated DC motor provides adjustable dc voltage.
The capacitor phase-shift triggered current converter of the present invention's design is a 2N zero formula current transformer mutually with regard to its structure, power supply grid is the N phase, therefore between the zero formula current transformer primary/secondary being arranged from N phase electrical network mutually to 2N is the rectifier transformer that N phase/2N has zero line mutually, for common three phase network, described current transformer is six zero formula mutually, described rectifier transformer is that △/Y-goes into the mode of connection, all be connected to switch element Qi(i=1～6 of a controlled shutoff of controlled unblank on the six roots of sensation phase line), the switch element of the controlled shutoff of described controlled unblank can be diode that bears reverse voltage of GTR string, it can be diode that bears reverse voltage of GTO string, also can be one to be merely able to bear the GTO element of reverse voltage, the KG type GTO element that provides of Baotou Aluminium Co., Ltd. for example, six switch element outputs and the zero line that is connected into an output line and rectifier transformer constitute two DC leadouts of current transformer; It below all is the example narration with N=3.
If the switch element GTR of described current transformer, promptly high-power binode type compound transistor, its circuits for triggering are by synchronizing signal, phase sequence automatic identification unit and phase-shift trigger unit constitute; Synchronizing signal is by the secondary voltage u of synchrotrans TFSYa, b, c
A1, u
B1, and u
C1Provide, its phase place respectively with power supply grid line voltage u
AB, u
BCAnd u
CAIdentical; The phase sequence automatic identification unit is by isolating transformer TFIS1,2, comparator C MP
1～4, D door bolt circuit LT
1, LT
3With variable connector MTA
1～6Form; Phase-shift trigger unit is by phase-shifting unit APSTy, b, r, pulsewidth forms circuit MSi(i=1～6), no matter how phase sequence can both guarantee variable connector MTi(i=1～6 that last turn-on switch component trigger impulse is turn-offed in one unblank switch element trigger impulse forward position, back) and MT ' i(i=1～6), buffer circuit BFi(i=1～6), pulse power amplifier circuit QAi(i=1～6) and pulse transformer TFMAi(i=1～6) constitute.
The unit side (8) of described phase-shifting unit APSTy, b, r is introduced synchronizing signal, and end (9) is introduced shifted signal from 15K Ω resistance, and 10K Ω resistance is introduced control signal i
Out, the unit is inner to be produced by the timing slope sawtooth waveforms of synchronizing voltage control and the signal synthesis decision phase shift value of unit side (9) introducing; The width that unit side (1) and (15) are exported the 180 ° of electrical degrees of being separated by respectively is 0.4 millisecond pulse.0.4 millisecond of wide pulse of phase-shifting unit output totally six to trigger output pulse width respectively be that six pulsewidths more than 80 ° form monostable trigger-action circuit MSi(i=1～6), its Q output is by buffer BFi(i=1～6) to pulse power amplifier circuit.
Described pulse power amplifier circuit is by power tube QAi(i=1～6) and as pulse transformer TFMAi(i=1～6 of power tube collector load) form; At the beginning of the described pulse transformer on the level winding and be connected to a discharge paths by the series connection of diode and resistance, as long as resistance is suitably big, QAi is become by saturation conduction and ends when occurring behind trigger impulse, and the pulse transformer core energy storage releases energy by elementary discharge loop and turn-offs at the switch element that the sharp negative pulse of secondary generation duration 40 microsecond is beneficial to be triggered.
If the switch element GTO of described current transformer, i.e. turn-off thyristor, its circuits for triggering are by synchronizing signal, phase sequence automatic identification unit and phase-shift trigger unit constitute; Synchronizing signal is identical with the corresponding circuits that adopts above-mentioned GTR switch element circuits for triggering with the phase sequence automatic identification unit; Phase-shift trigger unit is by phase-shifting unit or claim phase shift signal comprehensive unit APSTy, b, r, and pulsewidth forms the unit, and the unblanking pulse control signal is turn-offed pulse control signal and drive circuit unit and formed; Phase-shifting unit or claim phase shift signal comprehensive unit APSTy, b, r wherein; Pulsewidth forms unit MS
11～16And variable connector MT
1～6, MT '
1～6Identical with the corresponding circuits of phase-shift trigger unit in adopting GTR switch element circuits for triggering; MS1i(i=1～6) Q output is through inverter buffer BF1i(i=1～6) control corresponding binode type triode QA1i(i=1～6), binode type transistor collector output promptly is the unblanking pulse control signal, receives special-purpose GTO drive circuit DRCi(i=1～6) unblanking pulse control end ONC; MS1(i=1～6) Q output triggers MS2i(i=1～6) monostable, MS2i(i=1～6) Q output is through inverter buffer BF2i(i=1～6) control binode type triode QA2i(i=1～6), the output of the collector electrode of binode type triode QA2i promptly is to turn-off pulse control signal, receives above-mentioned GTO drive circuit DRCi(i=1～6) shutoff pulse control end OFFC; Corresponding GTO element Qi(i=1～6 are received in the output of drive circuit DRCi) gate pole on, make the reliable unblank of QAi when ONC DRCi when+15 volts of high level sends trigger impulse to Qi, when OFFC during for+15 volts of high level DRCi be that the negative pulse of 40 microseconds makes the GTO reliable turn-off to Qi gate pole injection element cut-off current nominal value 1/3rd width.
The present invention has designed a kind of capacitor phase-shift triggered current converter, and it can provide leading reactive power to the supply and AC electrical network when speed-regulated DC motor provides adjustable dc voltage.If these cover speed regulating device are parts of certain many motor-driven work mechanism, other drive motors is the three-phase alternating current mouse cage machine of using always, so, this work mechanism is because described speed regulating device produce the function of dynamic reactive power, be that DVG function (Dynamic Var Generation) keeps the power factor higher to power supply grid, reduce the reactive energy exchange of work mechanism and power supply grid, reached the purpose that reduces power transmission loss.
Accompanying drawing 1A adopts the phase-shift triggered current converter schematic diagram of GTO switch element.
Accompanying drawing 1B adopts the phase-shift triggered current converter schematic diagram of GTR serial connection diode as switch element.
When accompanying drawing 2 load currents equal direct current Id, power supply phase voltage, the elementary phase voltage winding current of rectifier transformer, the oscillogram of the elementary line current of rectifier transformer.
The secondary phase voltage waveform figure of accompanying drawing 3 rectifier transformers
The relation of accompanying drawing 4 current transformer bridge arm voltages and corresponding electric current
Corresponding driving circuit when accompanying drawing 5 converter switches elements are GTR
Accompanying drawing 6 the phase-shift trigger circuit that to be KJ004 slice, thin piece internal wirings constitute with outer auxiliary circuit with vertical controlled function.
Accompanying drawing 7 is as power supply A, B, when C is positive sequence, the temporal and logic relation figure of phase sequence automatic identification circuit
Accompanying drawing 9 is as power supply A, B, when C is positive sequence, and switch element triggers sequential logic figure
Accompanying drawing 10 is as power supply A, B, when C is negative phase-sequence, and switch element triggers sequential logic figure
Corresponding driving circuit when accompanying drawing 11 converter switches elements are GTO
The present invention was done the description in a step below in conjunction with accompanying drawing:
Its shift direction of capacitor phase-shift triggered current converter of the present invention's design is opposite with traditional AC-DC triode thyristor convertor assembly shift direction.From oscillogram, traditional triode thyristor phase-shift triggered current converter phase shifting angle can be shifted to the right to from α=0, for example, and α=150 °, or β=30 °.If this kind current transformer output current is the direct current of stepless ripple, so, can proves from power supply grid and see that the phasor power factor of this kind convertor assembly input equals cos α.In other words, when α≤90 °, α is big more, and output dc voltage is low more, and the mains supply current first harmonics is big more to voltage delay of the same name angle, and power factor is low more.
By symbol and the implication that traditional AC-DC triode thyristor phase-shift triggered current converter uses, phase shift range of the present invention is that α=0 ° moves left to α=-150 °.During actual the use often is [120 °～0 °].
The rectifier transformer of this convertor assembly is that △/Y-goes into the mode of connection.Current transformer is made up of the switch element of six controlled shutoffs of controlled unblank, can be GTR, also can be that GTO(sees accompanying drawing 1).The longest continuous conducting interval of each switch element is 60 ° of electrical degrees, for 50Hz electrical network, i.e. 3.33ms.
Accompanying drawing 2 is load currents when equaling direct current Id, power supply phase voltage, the elementary phase voltage winding current of rectifier transformer, the oscillogram of the elementary line current of rectifier transformer.
The direct voltage of current transformer output and the relation derivation of phase shift trigger angle are as follows, suppose that the current transformer output current is continuous, from accompanying drawing 3 as can be known: θ=2 π ft, f: mains frequency
=1.35V
2sin(α+60°)
So,
In other words, phase shift range current transformer in [60 °, 0 °] are interval is operated in rectification state, and phase shift range current transformer in [150 ° ,-60 °] are interval is operated in inverter mode.Here, continuous this prerequisite of current transformer output current is self-evident.
Can prove that if current transformer output numerical value constant DC stream Id, the α angle moves to left more so, described current transformer is big more to the leading reactive power that power supply grid provides.With the secondary a of rectifier transformer is example mutually, referring to accompanying drawing 4:
θ=2 π ft wherein, f is the power supply grid frequency, amplitude is that Id square wave current width is that 60 ° of electrical degrees are by switch element Q
1Provide.Amplitude is that the square wave current of 60 ° of electrical degrees is by switch element Q for-Id width
4Provide.Phase shift trigger angle α as shown in Figure 4.
For current wave being used cosine term Fourier series expression, Y axis Y is moved on to Id square wave centre position, new coordinate system transverse axis variable is represented with φ.
Obviously, φ=θ-α-30 °
Current wave function on new coordinate system is:
Be even function, be decided to be zero so have only the cosine term coefficient to differ.The cosine term fundamental factor
= 2/(π) Id
So the fundametal compoment of current wave is:
i
1（φ）＝ 2/(π) Idcosφ
With corresponding commutating voltage function
Compare as can be known (30 °-α) electrical degree of electric current leading voltages.
This has just proved that the α angle moves to left more, and current first harmonics is leading more.From contributing the leading reactive power this point to power supply grid, this convertor assembly is very desirable to the dc drive system power supply that drives the big torque load of middling speed.
This convertor assembly switch element is controlled shutoff.For avoiding the temporary overvoltage in the switch commutation course, the shutoff of previous element is depended in the unblank of a back element.The logical design of drive circuit has guaranteed this point.It guarantees that two switch elements in the commutation course have a conducting overlapping district, make the current transformer output current continuous.
If described converter switches element is GTR, i.e. High-power Semiconductor Triode, the corresponding driving circuit is as shown in Figure 5.Can be divided into following a few part by function describes:
1, synchronizing signal
2, phase sequence is discerned automatically
3, phase shift triggers
1, synchronizing signal: the phase shift function of described converter switches element circuits for triggering is to use the phase-shift trigger ic sheet, for example, finishes with KJ004.Accompanying drawing 6 the phase-shift trigger circuit that to be KJ004 slice, thin piece internal wirings constitute with outer auxiliary circuit with vertical controlled function.Produce a sawtooth waveforms by per half grid cyclic wave of the design of this circuit, synchronizing signal is sinusoidal wave.Because of the automatic needs of identification of phase sequence, synchronizing signal must be through multicircuit switch, and MC14016 for example receives the synchronous input end of KJ004, i.e. sheet pin＜8 〉.Synchronizing signal is by the secondary signal U of isolating transformer TFSYa, b and C
A1, U
B1And U
C1Form.The root-mean-square value of these three sinusoidal signals is 4.5 volts.
2, phase sequence is discerned automatically: phase sequence is by the line voltage U
ABAnd U
CAThrough isolating transformer TFIS
1,2Isolate then through reshaper CMP
1,2Be shaped to square wave then at d type flip flop, for example MC14013 discerns automatically.When power supply A, B and C are positive sequence, d type flip flop LT
1Q be output as high level, make H with postscript, and Q is a low level, make L with postscript, because at d type flip flop LT
1In clock input pulse rising edge constantly, its D input is H.Its temporal and logic relation is seen Fig. 7.When A, B and C are negative phase-sequence, LT
1Q be output as L and Q is H.The temporal and logic relation of phase sequence is seen Fig. 8.
When A, B and C were positive sequence, converter switches conducting order should be Q
1-Q
2-Q
3-Q
4-Q
5-Q
6-Q
1Circulation.When A, B and C were negative phase-sequence, converter switches conducting order should be Q
6-Q
5-Q
4-Q
3-Q
2-Q
1-Q
6Circulation.The present invention guarantees the automatic realization of this order with the way of adjusting phase shift trigger corresponding synchronous voltage.
With reference to accompanying drawing 5, work as A, when B and C are positive sequence, variable connector MTA1,3,5 conductings and MTA2,4,6 disconnects.Phase-shift trigger ic sheet PSTy, the b and the synchronizing signal on the r that are added in model and are KJ004 are respectively U successively
C1, U
A1And U
B1Thereby, realized that switch unblank trigger impulse is Q in proper order
1-Q
2-Q
3-Q
4-Q
5-Q
6The shield ring.When A, B and C were negative phase-sequence, variable connector MTA2,4,6 conductings and MAT1,3,5 disconnects made the synchronizing signal that is added on APSTy, b and the r become U successively respectively
B1, U
C1And U
A1Thereby, realized that switch unblank trigger impulse is Q in proper order
6-Q
5-Q
4-Q
3-Q
2-Q
1-Q
6Circulation.
D type flip flop LT
1Supply voltage is ± the 9v duplicate supply variable connector MTA
1～6The supply voltage of integrated circuit chip also is ± the 9v duplicate supply.
3, phase shift triggers: phase shift triggers function and is realized by phase shift trigger APSTy, b and the r that KJ004 phase shift triggering IC and outer auxiliary circuit constitute.Phase shifting angle is determined by three signal synthesis.These three signals are: the slope sawtooth waveforms is decided in the timing that the inner saw-toothed wave generator of KJ004 produces, and sawtooth waveforms length is about 170 ° of electrical degrees of the time between the synchronizing signal two adjacent zero crossings; By KJ004 sheet pin＜9〉on the 15K Ω resistance that connect introduce fixed offset voltage and introduce phase-shifted control signal with the 10K Ω resistance on a slice pin.Offset voltage is so adjusted: the offset voltage of adjusting under the null prerequisite of control signal makes trigger impulse occur in α=-60 ° moment.If the continuous DC component of output voltage so of current transformer output current this moment is zero just.The trigger impulse phase shift had just only been depended on control signal iout after skew was adjusted.If control signal is for negative, trigger impulse ° moves to right from α=-60, and promptly α becomes big, and current transformer is operated in controlled rectification state.If control signal is being for just, trigger impulse ° moves to left from α=-60, and promptly α diminishes.If this moment, external condition possessed, current transformer will be accepted to irritate direct current energy that electric current discharges load and be transformed into interchange and return power supply grid.
The switch element Q of current transformer
1～6Trigger pulse width be the broad pulse of 60 ° of electrical degrees.Pulsewidth is by six monostable MS
1～6Decision, monostable circuit can be the MC14528 integrated circuit.Monostable temporarily steady pulsewidth is adjusted about 80 ° of electrical degrees.The back edge of previous switch element trigger impulse is by the forward position control of a back switch element trigger impulse during real work, and purpose is to guarantee that two commutation switch have a conducting to overlap and distinguish.Its technology realizes: another d type flip flop LT
3Q and Q output SYA
1And SYA
2The control sequence on edge behind the control trigger impulse.When A, B and C are positive sequence, LT
3Q be H and Q is L, monostable like this MS
1～6The RESET input C
DLast variable connector MT
1～6Conducting and MT '
1～6Turn-off.Like this, with Q
1And Q
2Commutation course is that so to say that example sets forth its process: from MS
1Temporarily steady rising edge of a pulse begins, during 60 ° of electrical degrees, and MS
2Q become H from L, switch element Q
2Obtain trigger impulse, simultaneously MS
2Q become L from H, pass through MT
1Deliver to MS
1C
0Force MS
1Temporarily steady the end, if do not have this reset signal, MS
1Surely will continue 80 ° of left and right sides electrical degrees temporarily.Like this, MS
1Q become L, power tube QA
1End pulse transformer TFMA
1The positive triggering pulse of output finishes.The level winding forms discharge loop by resistance and the diode of suitably selecting at the beginning of the described pulse transformer.Like this, the pulse transformer secondary winding sends the sharp negative pulse acceleration switch element Q that amplitude continues tens of microseconds more greatly
1Shutoff.When A, B and C are negative phase-sequence, LT
3Q be L and Q is H, variable connector MT conducting and MT
1～6Turn-off.Still with Q
1Be example, at MS
1When surely continuing 60 ° of electrical degrees temporarily, MS
6Q become H, switch element Q
6Obtain trigger impulse, simultaneously MS
6Q become L, by MT '
1And MS
1C
DEnd forces MS
1Steady temporarily the end.Switch element Q
1The unblank trigger impulse obtain quickening turn-offing the situation of negative pulse and roughly the same preceding after finishing, repeat no more.
Clearly, phase-shift trigger ic sheet APSTy, b and r(KJ004 type in the accompanying drawing 5) in described drive circuit, have only two effects: the first, produce and control signal relative trigger pulse phase shift; The second, trigger the decision pulse duration and can realize that a back trigger impulse forward position controls the monostable circuit MS on edge behind the last trigger impulse
1～6Only 0.4 millisecond of the pulse duration of APSTy, b and r output itself is with switch element Q
1～6Trigger pulse width it doesn't matter.In addition,, also can not export width and reach 80 ° trigger impulse, so for example have to select for use the monostable IC sheet of MC145228 to realize this function because KJ004 can't realize that one trigger impulse forward position, back controls the function on edge behind the last trigger impulse.
Accompanying drawing 9 and 10 is respectively A, and B and C are that the switch element of positive sequence and negative phase-sequence triggers sequential logic figure.
Another some explanation is, why MS
1～6Temporarily steady pulsewidth fixes on greater than 80 ° of left and right sides electrical degrees.Six switch element Q of described current transformer
1～6Each element conductive 60 electrical degree in a grid cyclic wave, this is meant the situation when control voltage is a certain constant.And control signal is constantly changing to guarantee that operational system has the design objective of some regulation in the system of actual motion.Like this, two adjacent switch element ON time might be than 60 ° of weak points, also might be longer than 60 °.According to triode thyristor current transformer trigger impulse pattern (broad pulse or dipulse), MS
1～6Temporarily steady pulsewidth fixes on greater than 80 ° and has just met the demands less than 100 °.
If described converter switches element is GTO, i.e. turn-off thyristor, the corresponding driving circuit is as described in the accompanying drawing 11.It is by synchronizing signal, and phase sequence is discerned automatically and phase shift triggers three parts formation.It is identical with accompanying drawing 5 that synchronizing signal and phase sequence are discerned two parts automatically.The phase shift triggering part is comprehensive by phase shift signal, and pulsewidth forms, and the unblanking pulse control signal is turn-offed pulse control signal and drive circuit unit and formed.Phase shift signal is comprehensively at integrated APST of phase shift trigger
Y, b, rOn carry out, comprehensively determine the phase shift value from the timing slope sawtooth waveforms of the control signal iout of sheet＜9〉end 15K Ω resistance input and sheet generation itself, the be separated by triggering signal of 180 ° of electrical degrees of generation is respectively held in sheet it＜1〉and＜15 〉.Pulsewidth forms: phase shift triggering signal rising edge is APST
Y, b, rIt＜1〉and＜15〉end output signal removes to trigger each monostable MS respectively
11～16, monostable pulsewidth is more than 80 °, and the edge is by monostable C behind the actual trigger impulse
DEnd letter in reply signal deciding.With switch element Q
1Trigger sequence is an example under power supply positive sequence condition, at this moment variable connector control signal SYA
1Be high level, SYA
2Be low level, so variable connector MT
1～6Logical, MT '
1～6Disconnected.As switch element Q
2The trigger impulse forward position occurs, MS
12Q pulse trailing edge pass through MT
1At MS
11C
DEnd makes MS
11Reset QA
11Output step-down level, Q
1The unblank trigger impulse finish.QA
11Collector electrode output promptly is the special-purpose drive circuit DRCi(i=1 of GTO～6) the unblanking pulse control signal of (for example KGC drive circuit of Baotou Aluminium Co., Ltd.'s development), receive the ONC end of DRCi.Turn-off pulse control signal: MS
11Q be MS
21Triggering input, MS
21Q output pass through BF
21Make QA
21Saturation conduction is exported the shutoff negative pulse control signal of 40 microsecond wide cut degree+15 volts, and this signal is received the special-purpose drive circuit DRCi(i=1 of GTO～6) shutoff pulse control end OFFC.Drive circuit is used for controlling GTO unblank and shutoff.With the KGC drive circuit is example, drive circuit triggers the GTO gate pole and makes its unblank when the unblanking pulse control signal is+15 volts, when turn-offing pulse control signal and be+15 volts, drive circuit to GTO gate pole injection element cut-off current nominal value 1/3rd and width to be the negative pulse of 40 microseconds make the GTO reliable turn-off.
Last point explanation is: general GTR or GTO have an anti-and diode, so to be a GTR connect with a diode that bears back-pressure or a GTO connects with a diode that bears back-pressure at the controlled cut-off device of controlled unblank described in this programme.Like this, by the voltage characteristic assurance of GTR or GTO, switch element reverse voltage ability to bear was guaranteed by described series diode reverse voltage ability to bear when switch element bore forward voltage.Certainly, if the KG type GTO element of employing Baotou Aluminium Co., Ltd. just can be without series diode.
Direct Current Governor System with Flow varying power supply provides the precedent of leading reactive power to have to power supply grid.For example, the patent CN87106578A of Hitachi promptly is an example, what yet this patent was discussed is a variable duration impulse system, but the current transformer of forming a three-phase full-controlled bridge form with the stopcock element, in a grid cyclic wave, each switch carries out the several times unblank and turn-offs operation, the width of each pulse in the control impuls sequence, switching frequency for example 500HZ is above to 3KHZ, thereby realizes that according to the pulse duty factor that the reactive power of general load in the detected same electric power system is controlled described converter system current transformer provides the purpose of leading reactive power to power supply grid.Described converter system belongs to current source type.
The system that the present invention relates to is a phase-shift trigger system, owing to adopted the switch element of the controlled cut-off device of controlled unblank as current transformer, the phase shift direction is opposite with traditional triode thyristor three-phase full-controlled bridge.Triode thyristor three-phase full-controlled bridge phase shift direction is for example ° to be shifted to the right to α=150 ° from α=0, wherein phase shifting angle α is at [0 °, 90 °] between the time current transformer be operated in the controlled rectification state, α is at [90 °, 150 °] between the time current transformer be operated in inverter mode, if the dc load of described current transformer has enough energy to want feedback to go into the Alternating Current Power Supply electrical network.The phase shift direction of current transformer of the present invention is for example ° to move left to α=-150 ° from α=0, wherein phase shifting angle α is at [60 °, 0 °] between the time current transformer be operated in the controlled rectification state, α is at [150 °,-60 °] between the time current transformer be operated in inverter mode, if the dc load of described current transformer has enough energy to want feedback to go into the Alternating Current Power Supply electrical network.Because this current transformer phase shift direction moves to left, so the current first harmonics phase place that current transformer provides is leading voltage of the same name, has realized sending to power supply grid the purpose of leading reactive power.Current transformer of the present invention is a 2N zero formula current transformer mutually with regard to its structure, if power supply grid is the N phase.For the three phase supply electrical network, this current transformer is six zero mutually formulas.Six roots of sensation phase line connects six controlled stopcocks of controlled unblank, and six switch outputs connect together as one of current transformer direct current output end, and the other end of direct current output promptly is a zero line.
First example of using the DVG function that the present invention sets forth will be the high-power high seam electrical haulage shearer of China drum shearer manufacturing enterprise exploitation during the 8th five-year plan.It is higher that the trailer system of coal-winning machine is updated to reliability by traditional hydraulic haulage drive system, the better electrical haulage drive system of adjusting function.State Council's decision, coal mine is divided into the power backup pressure and is kept 1140 volts, do not consider to boost (all having boosted to 2300 volts or 3000 volts abroad) during the 8th five-year plan.In addition, coal-winning machine is by powering around the trailing cable of song as down-hole reciprocating motion type production equipment.Consider fail safe around bent and towing-can not split off cable core or because of can only being 3 * 95 square millimeters around song destruction cable winding-cross-section of cable maximum.
This kind outside diameter of cable has been 76 millimeters! The safe current that uses under coal mine can not surpass 260 peaces.Like this, magnitude of voltage and lowest high-current value determine that one 1140 volts, the maximum apparent power that the power cable in 3 * 95 square millimeters of cross sections can transmit equals:
The three-phase squirrel cage machine rated power factor of considering the coal-winning machine equipment is generally all about 0.85, so the active power that described cable can transmit is
531 * 0.85=436 kilowatt
With design point of view, it is generally acknowledged one 1140 volts, 3 * 95 square millimeters of power cables can transmit 400 kilowatts of active power bases under coal mine be this.So the technical staff of research and design coal-winning machine thinks that the electrical haulage shearer of developing during the 8th five-year plan of China is powered with two 3 * 95 square millimeters of power cables, the maximum power of design can be above 800 kilowatts.
Yet coal is the topmost primary energy of China, and development and national economy increases very fast to the requirement of coal.The coal production industry is badly in need of wanting the big as far as possible coal-winning machine of gross power, such as, the total installation of generating capacity high-power coal cutter greater than 900 kilowatts.This just forces people's door to go to seek a way and makes an issue of improving on the power factor of service cable.
In the coal-winning machine fuselage, install, for example, the patented product SVS of Xi-an Coal Mine Machinery Plant type state type reactive power automatic compensator compensates to the load power factor of seeing from service cable more than 0.99, and the output of coal-winning machine active power can still remain in 260 peaces by the service cable running current up to 1000 kilowatts like this.The capacity of but this SVS device is 620 kilograms at least, and device volume is bigger, is difficult to put in the coal-winning machine fuselage, does not also say the explosion-proof that running environment proposes under the coal mine, and shock resistance etc. are to other technical problem of building-out capacitor specific (special) requirements.
If the DVG technology that adopts the present invention to set forth, this problem promptly is readily solved.
If do not adopt the DVG technology, the following configuration of coal-winning machine electric power system: 3 * 95 square millimeters of cables carry 300 kilowatts of Rolling motors, 120 kilovolt-amperes of rectifier transformers, and this transformer carries two 40 kilowatts of dc traction motors by current transformer.This cable carries 380 kilowatts of burdens with power altogether, and cable power factor is 0.85 or lower.
Another cable also is 3 * 95 square millimeters, another 300 kilowatts of Rolling motors of frame, 65 kilowatts of broken Rolling motor (short-term operation, often unloaded), a capacity below 15 kilowatts heighten pump motor (short-term operation, often unloaded).Like this, coal-winning machine overall apparatus capacity is 760 kilowatts.
If adopt the DVG technology, the coal-winning machine electric power system is configurable as follows: 3 * 95 square millimeters of cables carry 375 kilowatts of Rolling motors, 170 kilovolt-amperes of rectifier transformers, this transformer carries two 40 kilowatts of dc traction motors by the current transformer with DVG function that the present invention sets forth.This cable carries 455 kilowatts of active power loads altogether.According to calculating simulation, this cable power factor is up to 0.93 even higher.Another 3 * 95 square millimeters of cables carry 375 kilowatts of Rolling motors, and 65 kilowatts of broken Rolling motor (short-term operation, often unloaded) and one heighten pump motor (short-term operation, often zero load) below 15 kilowatts.
Like this, coal-winning machine overall apparatus capacity is 910 kilowatts.Crucial problem is, the cable current that carries 455 kilowatts of burdens with power does not increase, when middling speed traction coal cutting work, and this cable current even also low during than the same operating mode of first kind of scheme, power factor is much higher.
Claims (2)
1, a kind of capacitor phase-shift triggered current converter is made of rectifier transformer and switch element, it is characterized in that:
(1) capacitor phase-shift triggered current converter is a 2N zero a formula current transformer mutually, and power supply grid is the N phase; Between the zero formula current transformer primary/secondary being arranged from N phase electrical network mutually to 2N is N phase/2N phase (zero line is arranged) rectifier transformer; For common three phase network, described current transformer is six zero mutually formulas, and described rectifier transformer is △/Y-λ mode of connection, and the switch element Q of a controlled shutoff of controlled unblank is all arranged on the six roots of sensation phase line
i(i=1～6), the switch element of the controlled shutoff of described controlled unblank can be diode that bears reverse voltage of GTR string, it can be diode that bears reverse voltage of a GTO string, also can be one to be merely able to bear the GTO element of reverse voltage, six switch element outputs and the zero line that is connected into an output line and rectifier transformer constitute two DC leadouts of current transformer; It below all is the example narration with N=3;
(2) switch element of described current transformer adopts high-power binode type compound transistor GTR, and its circuits for triggering are by synchronizing signal, and phase sequence automatic identification unit and phase-shift trigger unit constitute; Synchronizing signal is by the secondary voltage U of synchrotrans TFSYa, b, c
A1, U
B1, and U
C1Provide, its phase place respectively with power supply grid line voltage U
AB, U
BCAnd U
CAIdentical; The phase sequence automatic identification unit is by isolating transformer TFIS1,2, comparator C MP
1～4, D door bolt circuit LT
1, LT
3With variable connector MTA
1～6Form; Phase-shift trigger unit is by phase-shifting unit APST
y, b, r, pulsewidth forms circuit MSi (i=1～6), no matter how phase sequence can both guarantee that one unblank switch element trigger impulse forward position, back turn-offs the variable connector MTi (i=1～6) and the MT ' i (i=1～6) of last turn-on switch component trigger impulse, buffer circuit BFi (i=1～6), pulse power amplifier circuit QAi (i=1～6) and pulse transformer TFMAi (i=1～6) constitute;
(3) unit side (3) of described phase-shifting unit APSTy, b, r is introduced synchronizing signal, end (9) phase shift value; The width that unit side (1) and (15) are exported the 180 ° of electrical degrees of being separated by respectively is 0.4 millisecond pulse.0.4 millisecond of wide pulse of phase-shifting unit output totally six to trigger output pulse width respectively be that six pulsewidths more than 80 ° form monostable trigger-action circuit MSi (i=1～6), its Q output by buffer BFi (i=1～6) to pulse power amplifier circuit;
(4) described pulse power amplifier circuit is formed by power tube QAi (i=1～6) with as the pulse transformer TFMAi (i=1～6) of power tube collector load; At the beginning of the described pulse transformer on the level winding and be connected to a discharge paths by the series connection of diode and resistance, as long as resistance is suitably big, QAi is become by saturation conduction and ends when occurring behind trigger impulse, and the pulse transformer core energy storage releases energy by elementary discharge loop and turn-offs at the switch element that the sharp negative pulse of secondary generation duration 40 microsecond is beneficial to be triggered.
2, a kind of capacitor phase-shift triggered current converter as claimed in claim 1, the switch element that it is characterized in that described current transformer is GTO, i.e. and turn-off thyristor, its circuits for triggering are by synchronizing signal, and phase sequence automatic identification unit and phase-shift trigger unit constitute; Synchronizing signal is identical with the corresponding circuits that adopts above-mentioned GTR switch element circuits for triggering with the phase sequence automatic identification unit; Phase-shift trigger unit is by phase-shifting unit or claim phase shift signal comprehensive unit APSTy, b, r, and pulsewidth forms the unit, and the unblanking pulse control signal is turn-offed pulse control signal and drive circuit unit and formed; Phase-shifting unit or claim phase shift signal comprehensive unit APSTy, b, r wherein; Pulsewidth forms unit MS
11～16And variable connector MT
1～6, MT '
1～6Identical with the corresponding circuits of phase-shift trigger unit in adopting GTR switch element circuits for triggering; MS1i(i=1～6) Q output is through inverter buffer BF1i(i=1～6) control corresponding binode type triode QA1i(i=1～6), binode type transistor collector output promptly is the unblanking pulse control signal, receives special-purpose GTO drive circuit DRCi(i=1～6) unblanking pulse control end ONC; MS1(i=1～6) Q output triggers MS2i(i=1～6) monostable, MS2i(i=1～6) Q output is through inverter buffer BF2i(i=1～6) control binode type triode QA2i(i=1～6), the output of the collector electrode of binode type triode QA2i promptly is to turn-off pulse control signal, receives above-mentioned GTO drive circuit DRCi(i=1～6) shutoff pulse control end OFFC; Corresponding GTO element Qi(i=1～6 are received in the output of drive circuit DRCi) gate pole on, make the reliable unblank of QAi when ONC DRCi when+15 volts of high level sends trigger impulse to Qi, when OFFC during for+15 volts of high level DRi be that the negative pulse of 40 microseconds makes the GTO reliable turn-off to Qi gate pole injection element cut-off current nominal value 1/3rd width.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91109034 CN1021609C (en) | 1991-09-24 | 1991-09-24 | Capacitor phase-shift triggered current converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91109034 CN1021609C (en) | 1991-09-24 | 1991-09-24 | Capacitor phase-shift triggered current converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1059625A true CN1059625A (en) | 1992-03-18 |
| CN1021609C CN1021609C (en) | 1993-07-14 |
Family
ID=4909599
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91109034 Expired - Fee Related CN1021609C (en) | 1991-09-24 | 1991-09-24 | Capacitor phase-shift triggered current converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1021609C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570474A (en) * | 2011-11-16 | 2012-07-11 | 郑学超 | Triggering and conducting method used for switching of capacitor of thyristor AC non-contact switch |
| CN110718201A (en) * | 2019-10-24 | 2020-01-21 | 厦门飞盈海科技有限公司 | Liquid crystal driving chip capable of reducing pin number |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7110272B2 (en) * | 2004-06-22 | 2006-09-19 | Smc Electrical Products, Inc. | Inverter bridge controller implementing short-circuit protection scheme |
-
1991
- 1991-09-24 CN CN 91109034 patent/CN1021609C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102570474A (en) * | 2011-11-16 | 2012-07-11 | 郑学超 | Triggering and conducting method used for switching of capacitor of thyristor AC non-contact switch |
| CN102570474B (en) * | 2011-11-16 | 2013-11-13 | 郑学超 | Triggering and conducting method used for switching of capacitor of thyristor AC non-contact switch |
| CN110718201A (en) * | 2019-10-24 | 2020-01-21 | 厦门飞盈海科技有限公司 | Liquid crystal driving chip capable of reducing pin number |
| CN110718201B (en) * | 2019-10-24 | 2021-09-28 | 厦门骏陆科技有限公司 | Liquid crystal driving chip capable of reducing pin number |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1021609C (en) | 1993-07-14 |
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