CN86106376A - Asynchronous machine cascade adjustable-speed system with high power factor - Google Patents
Asynchronous machine cascade adjustable-speed system with high power factor Download PDFInfo
- Publication number
- CN86106376A CN86106376A CN86106376.7A CN86106376A CN86106376A CN 86106376 A CN86106376 A CN 86106376A CN 86106376 A CN86106376 A CN 86106376A CN 86106376 A CN86106376 A CN 86106376A
- Authority
- CN
- China
- Prior art keywords
- inverter
- asynchronous machine
- current
- power factor
- change
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 32
- 229910052710 silicon Inorganic materials 0.000 claims description 32
- 239000010703 silicon Substances 0.000 claims description 32
- 238000009499 grossing Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 2
- 230000007704 transition Effects 0.000 claims 1
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 9
- 230000003111 delayed effect Effects 0.000 description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000005764 inhibitory process Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Images
Landscapes
- Inverter Devices (AREA)
Abstract
" asynchronous machine cascade adjustable-speed system with high power factor ", be applicable to the power factor that improves asynchronous machine cascade adjustable-speed system, it is to use used inverter in the at present general asynchronous machine string adjusting system instead triple-frequency harmonics forced commutation formula inverter, and by the control device that is provided with in the system, guarantee that forced commutation reliably carries out, make inverter absorb leading reactive current with the reactive current of compensation asynchronous machine, reach the purpose that improves the whole system power factor from the backwardness of electrical network absorption from electrical network.Adopt this system, at constant torque load, in 1: 2 speed adjustable range, cos reaches 0.90～0.99.And in fan-type load, when speed adjustable range during at 1: 1.5, cos is 0.8～0.99.
Description
The present invention relates to asynchronous machine cascade adjustable-speed system, be used to improve the power factor of asynchronous machine cascade adjustable-speed system, be specially adapted to the asynchronous machine cascade adjustable-speed system of blower fan, the energy-conservation usefulness of pump speed control.
At present, in the cascade adjustable-speed system of asynchronous machine, adopt the bridge-type line voltage nature change of current formula inverter of forming by six controllable silicons mostly, because this inverter needs to draw more reactive current from electrical network, so make the power factor of whole governing system very low, the power factor of system has only 0.4～0.6 usually.Commercial Application association of AIEE, disclose in annual meeting collection of thesis P534～542 in 1981 a kind of with the pressure regulation of band chopper inverter or improve the power factor of asynchronous machine cascade adjustable-speed system with the inverter of being with the controllable afterflow pipe, though the reactive power that these inverters are drawn from electrical network reduces to some extent, but for whole system, power factor still improves seldom, the highlyest also is no more than 0.78.Other has a kind of, be to adopt series diode formula inverter, this inverter is owing to adopt forced commutation, though can make the power factor of system obtain improving more significantly, but its complex circuit, required element not only quantity is many, and requires the electric pressure of thyristor higher, thereby cost an arm and a leg, practical value is little.
Purpose of the present invention is intended to promote the solution of above-mentioned these problems, provides that a kind of circuit is simple, cheap, the asynchronous machine cascade adjustable-speed system of High Power Factor.
Solution of the present invention is: used inverter adopts triple-frequency harmonics forced commutation formula inverter in the asynchronous machine string adjusting system, silicon controlled main rectifier in the inverter is carried out forced commutation, in system, also be provided with control device, carrying out in good time to silicon controlled main rectifier, delay triggers control, suppress the silicon controlled overvoltage, guarantee the reliability of forced commutation, and the trigger angle of silicon controlled main rectifier is between 180 °～300 °.
The asynchronous machine string adjusting system that the present invention proposes, owing to adopted triple-frequency harmonics forced commutation formula inverter, the leading reactive current that this inverter absorbs from electrical network, compensated the reactive current of asynchronous machine from the hysteresis of electrical network absorption, thereby the overall power factor of asynchronous machine cascade adjustable-speed system is significantly improved, from having solved the low problem of asynchronous machine string adjusting system power factor in essence.
The present invention has following accompanying drawing:
Fig. 1 is the schematic diagram of asynchronous machine cascade adjustable-speed system;
Fig. 2 is synchronization pulse generator (only showing the circuit that a pulse signal takes place).
Fig. 3 is electric capacity isolation detection circuit and threshold voltage discriminator.
Fig. 4 is pulse assignment of logical device and enable logic controller.
Fig. 5 is power amplifier (only showing the circuit that amplifies a triggering signal).
Wherein Fig. 2～Fig. 5 has provided a kind of specific embodiment of control device of the present invention.
For the ease of understanding formation of the present invention, be illustrated below in conjunction with Fig. 1.With reference to Fig. 1, asynchronous machine string adjusting system is made of major loop and control device, and its major loop comprises wire-wound asynchronous motor D, rotor rectifier S, smoothing reactor L, triple-frequency harmonics forced commutation formula inverter A and contravariant transformer B, this inverter A are by six silicon controlled main rectifier T
1～T
6Increase by two auxiliary controllable silicon T in the bridge circuit of forming
7, T
8And at T
7, T
8The centre and the mid point of contravariant transformer three phase windings between insert change of current capacitor C and constitute.Control device comprises synchronization pulse generator 1, enable logic controller 2, pulse assignment of logical device 3, electric capacity isolation detection circuit 4, threshold voltage discriminator 5, power amplifier 6 and electric capacity pre-charge circuit 7.During work, before the smoothing reactor electric current is set up, enable logic controller 2 at first produces a low level, the signal of synchronization pulse generator 1 is all blocked, at this moment, pre-charge circuit 7 is given the precharge of change of current capacitor C earlier, the voltage of change of current capacitor C is sent in the threshold voltage discriminator 5 after electric capacity isolation detection circuit 4 detects, differentiate the polarity and the size of capacitance voltage, when change of current capacitance voltage reaches predetermined threshold voltage, just make corresponding output transfer high level to by low level.After the smoothing reactor electric current was set up, when reaching change of current electric current, the enable logic controller had just been removed the blockade to synchronization pulse, makes inverter startup.By pulse assignment of logical device 3 pulse signal generators of motor synchronizing in the future 1, the signal of enable logic controller 2 and threshold voltage discriminator 5 carries out comprehensively, produces control controllable silicon T
1～T
8Triggering signal.After power amplifier 6 amplifies, supply with the controllable silicon in the inverter, wherein silicon controlled main rectifier T again
1～T
6Implementation postpones to trigger control in good time, with inhibition silicon controlled overvoltage, and inverter silicon controlled trigger angle is between 180 °～300 °, to obtain higher power factor.
This inverter is by means of suitably the triggered time of auxiliary controllable silicon of control and silicon controlled main rectifier is controlled discharging and recharging of change of current capacitor C, transfer to the branch road of being formed by auxiliary controllable silicon and change of current capacitor C with the controllable silicon branch road that the load current that forces the inverter of flowing through turn-offs from needs earlier, and then load current is transferred on the controllable silicon branch road that to open by the branch road that this auxiliary controllable silicon and change of current capacitor C are formed, realize the change of current between the inverter silicon controlled main rectifier with this, and make inverter absorb leading reactive current from electrical network.
Now the basic circuit of being given with accompanying drawing is an example, specifically sets forth use-case.During the starting beginning, change of current capacitor C is passed through pre-charge circuit 7 precharge, if the polarity of change of current capacitor C is as shown in Figure 1, and the voltage u of this electric capacity
cPolarity and size through isolation detection circuit detect and the threshold voltage discriminating after (Fig. 3), at output output signal 7T, 8T supposes that when the voltage on the change of current electric capacity reached desired threshold voltage, discriminator was output as 8T and is high potential, 7T is electronegative potential.Enable logic controller 2(Fig. 4) JS in is the delayed start relay; it has only the electric current of setting up necessity when smoothing reactor; just closed in the time of can guaranteeing the change of current; before the electric current of smoothing reactor is set up; also promptly before delayed start relay J S closure; not gate 13 output electronegative potentials in the enable logic controller; at this moment; signal iT(i=1～6 that the synchronization pulse generator sends; iT=1T～6T) all be blocked; and not gate 10 and 14 produces electronegative potential, by power amplifier trigger impulse is added to controllable silicon T
1And T
6On, make their energisings.Treat current increases to certain numerical value, promptly the smoothing reactor electric current is set up, in the time of can guaranteeing the change of current; JS closure, not gate 13 arrive at 2T pulse and constantly export positive potential, thereby have removed the blockade to synchronization pulse; make inverter startup, normal operation input.Signal 1T～6T that pulse assignment of logical device sends the synchronization pulse generator, the signal 7T of threshold voltage discriminator output, the signal F of 8T and the output of enable logic controller
ACarry out comprehensively, produce control controllable silicon T
1～T
8Triggering signal T
j(j=1～8) are exaggerated in the input power amplifier.If as controllable silicon T
6To T
2During the change of current, the trigger impulse 2T that is come by the synchronization pulse generator makes controllable silicon T through pulse assignment of logical device
8Conducting, and controllable silicon T
2Trigger impulse be delayed owing to being subjected to the clamping down on of 7T electronegative potential that the threshold voltage discriminator produces, this moment, main circuit current was just by controllable silicon T
6Transfer to T
8On, make the reverse charging again of discharging before this then of change of current capacitor C, when being charged to the threshold voltage of regulation, 7T occurring and be high potential, it is controllable silicon T
2Locking signal on the passage is removed, so controllable silicon T
2The conducting that is triggered, electric current is from T
8Forward T again to
2On, thereby finished the forced commutation process.
The asynchronous machine string adjusting system that the present invention proposes, if the control circuit that cooperates the foregoing description to give, the controllable silicon of its inverter can adopt plain edition, its the highest peak-inverse voltage is only paid about 2 times of limit phase voltage peak value for contravariant transformer, than other forced commutation modes, circuit is simple, and is cheap.Test shows, adopts the present invention, and under constant torque load, in 1: 2 speed adjustable range, cos φ is 0.90 to 0.99, and in fan-type load, and when speed adjustable range during at 1: 1.5, cos φ is between 0.8 to 0.99.
Claims (2)
1, asynchronous machine cascade adjustable-speed system with high power factor, has wire-wound asynchronous motor [D], rotor rectifier [S], smoothing reactor [L], inverter [A] and contravariant transformer [B], it is characterized in that said inverter [A] adopts triple-frequency harmonics forced commutation formula inverter, this inverter is by six silicon controlled main rectifier [T
1～T
6] in the bridge circuit formed, increase by two auxiliary controllable silicon [T
7, T
8] and at [T
7, T
8] the centre and the mid point of contravariant transformer three phase windings between insert change of current electric capacity [C] and constitute; Also be provided with control device in system, the triggering signal that it produces is carried out silicon controlled main rectifier and is postponed to trigger control in good time, and the trigger angle of silicon controlled main rectifier is between 180 °～300 °.
2, by the described system of claim 1, it is characterized in that said control device comprises:
A) synchronization pulse generator (1);
B) enable logic controller (2) before the smoothing reactor electric current is set up, enforces a blockade to synchronization pulse, only after the smoothing reactor electric current is set up, just lifts a blockade.
C) electric capacity pre-charge circuit (7) is to change of current electric capacity (C) precharge.
D) electric capacity isolation detection circuit (4), the voltage of isolation detection change of current electric capacity.
E) threshold voltage discriminator (5) is differentiated the polarity and the size of change of current capacitance voltage, and when capacitance voltage reached predetermined threshold voltage, just making corresponding output was high level by low transition.
F) pulse assignment of logical device (3), from the synchronization pulse generator, the signal of enable logic controller and threshold voltage discriminator carries out comprehensively, produces control controllable silicon (T
1～T
8) triggering signal.
G) power amplifier (6), the triggering signal of paired pulses assignment of logical device output is amplified.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86106376 CN1008229B (en) | 1986-09-26 | 1986-09-26 | Asynchronous machine cascade adjustable -speed system with high power factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86106376 CN1008229B (en) | 1986-09-26 | 1986-09-26 | Asynchronous machine cascade adjustable -speed system with high power factor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN86106376A true CN86106376A (en) | 1988-04-06 |
| CN1008229B CN1008229B (en) | 1990-05-30 |
Family
ID=4803174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86106376 Expired CN1008229B (en) | 1986-09-26 | 1986-09-26 | Asynchronous machine cascade adjustable -speed system with high power factor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1008229B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1989688B (en) * | 2004-08-05 | 2010-09-15 | 西门子公司 | Method for operating a two-phase rotary current controller |
-
1986
- 1986-09-26 CN CN 86106376 patent/CN1008229B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1989688B (en) * | 2004-08-05 | 2010-09-15 | 西门子公司 | Method for operating a two-phase rotary current controller |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1008229B (en) | 1990-05-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1295668C (en) | Power converter device having starting circuits, and a method for startingthe power converter device | |
| CN103441504B (en) | There is series compensation low voltage ride through device and the control method of self-charging function | |
| CN106877709A (en) | One kind is used for high voltage converter pre-charging device and method | |
| CN103986347B (en) | A kind of three-phase semi-controlled bridge type rectification triggering circuit with defencive function | |
| CN106992535B (en) | Constant current pre-charging method for high-voltage direct-current bus capacitor of electric energy router | |
| CN106026787A (en) | Five-stage discrete frequency-conversion soft-start device based on power factor angle closed-loop control | |
| CN111669041A (en) | Slow start control method for high-power high step-up ratio direct current converter | |
| CN107276381A (en) | High voltage converter pre-charging device and charging method based on electric power electric transformer | |
| CN86106376A (en) | Asynchronous machine cascade adjustable-speed system with high power factor | |
| US4012682A (en) | Low KVA static AC motor drive | |
| Herskind | Grid controlled rectifiers and inverters | |
| CN115224724A (en) | Three-phase grid-connected connection method of energy storage system with filter capacitor | |
| CN108471261A (en) | A kind of activation system and method for digital electricity generating group | |
| CN211791248U (en) | Device for precharging frequency converter | |
| US4467259A (en) | Slip energy recovery control system using hybrid inverter to improve quadrature current consumption | |
| RU2716493C1 (en) | Control method of multi-zone rectifier-inverter converter of single-phase alternating current | |
| CN106787967B (en) | Universal frequency converter with counter-current resistor and control method | |
| CN103618490A (en) | Variable-frequency speed regulation device of six-phase alternating-current motor | |
| CN203590110U (en) | Six-phase AC motor frequency conversion speed adjusting device | |
| CN206775422U (en) | A kind of brushless dual-feed motor starts control device | |
| Belenov et al. | Investigation of the Braking Mode of an Asynchronous Frequency Electric Drive with an Energy Buffer in the DC Link | |
| CN2390351Y (en) | Voltage-regulated pulse laser power supply | |
| CN219477837U (en) | Three-level medium-voltage frequency converter direct current bus pre-charging loop | |
| CN106899242A (en) | A kind of brushless dual-feed motor starts control device and method | |
| CN115902359A (en) | Method for judging current state of stator winding in pipe-closing state of permanent magnet synchronous motor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| C14 | Grant of patent or utility model | ||
| C19 | Lapse of patent right due to non-payment of the annual fee |