CN104166418B - A kind of control method of hypervelocity energy-saving alternating current stable-pressure device - Google Patents
A kind of control method of hypervelocity energy-saving alternating current stable-pressure device Download PDFInfo
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- CN104166418B CN104166418B CN201410439118.4A CN201410439118A CN104166418B CN 104166418 B CN104166418 B CN 104166418B CN 201410439118 A CN201410439118 A CN 201410439118A CN 104166418 B CN104166418 B CN 104166418B
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Abstract
The present invention discloses a kind of hypervelocity energy-saving alternating current stable-pressure device and control method thereof, stable-pressure device comprises control module, voltage detection unit, the first electronic switch, the second electronic switch, mains connection and output end of stabilized voltage supply, the three-phase line between mains connection and output end of stabilized voltage supply is serially connected with successively the first energy storage inductor, current-limiting resistance, storage capacitor and the second energy storage inductor; Each current-limiting resistance two ends respectively and be connected to gate-controlled switch; The control input end connection control unit of gate-controlled switch; Two electronic switches comprise control input end and three current input terminals respectively, wherein control input end connection control unit, the current input terminal of the first electronic switch is connected between current-limiting resistance and storage capacitor, and the current input terminal of the second electronic switch is connected between storage capacitor and the second energy storage inductor; The input end of voltage detection unit connects mains connection, exports the voltage signal detected to control module; Control module controls the on off state of gate-controlled switch, and the conducting of the first electronic switch and the second electronic switch and cut-off.
Description
Technical field
The present invention relates to the voltage stabilizing control technology field of the technology such as combined power Electronic Control, microelectronics, high power device design and special power modular design, particularly one is applicable to the unstable place of supply voltage, the hypervelocity energy-saving alternating current stable-pressure device that can automatically adjust to unstable voltage and control method thereof.
Background technology
The terminal electricity consumption of current China is often in spread of voltage state, China's " power supply and business rules " regulation admissible deviation of supply volt-age is be no more than ratings ± 10%, and the utilization voltage of actual measurement Jiangsu Duo Di enterprise is many in about+10% fluctuations for daytime, consider that power and voltage are quadratic relationship, if utilization voltage superpressure 10%, if the impedance of load is constant, real power is by overrate 20%.
In order to avoid the energy loss that spread of voltage brings, there is corresponding voltage stabilizing product in prior art, but traditional voltage stabilizing product pays attention to voltage stabilizing function more, itself but will consume electric energy.There is no the product that voltage stabilizing also can save energy simultaneously in the market.Existing common voltage stabilizer is used in voltage-stabilizing and energy-saving aspect and there is multinomial defect: one is that pressure regulation speed is slow, pressure regulation time >=1 second, the rapid reaction for precision equipment can not adapt to; Two is that efficiency is on the low side, generally about 95%, if voltage-stabilizing and energy-saving 5%, and body consumption of only breaking even, and also time unloaded, transformer still has power consumption, may also add power consumption; Three is that to consume copper material, steel many, and weight, volume are very large.
Summary of the invention
The present invention passes through the design of power model and corresponding control framework, realizes the automatic adjustment to unstable voltage, object that can also be energy-conservation while reaching high speed pressure regulation.
The technical scheme that the present invention takes is: a kind of hypervelocity energy-saving alternating current stable-pressure device, comprise mains connection and output end of stabilized voltage supply, the three-phase line between described mains connection and output end of stabilized voltage supply is serially connected with successively the first energy storage inductor, current-limiting resistance, storage capacitor and the second energy storage inductor;
Above-mentioned each current-limiting resistance two ends respectively and be connected to gate-controlled switch;
Also comprise control module, voltage detection unit, the first electronic switch and the second electronic switch; The control input end connection control unit of gate-controlled switch; First electronic switch and the second electronic switch comprise control input end and three current input terminals respectively, wherein control input end connection control unit, three current input terminals of the first electronic switch are connected in three-phase line between current-limiting resistance and storage capacitor, and three current input terminals of the second electronic switch to be connected in three-phase line between storage capacitor and the second energy storage inductor; The input end of voltage detection unit connects mains connection to detect input voltage, then exports the voltage signal detected to control module; Control module controls the on off state of gate-controlled switch according to voltage signal, and the conducting of the first electronic switch and the second electronic switch and cut-off.
The present invention is when applying, and the unstable voltage of civil power input can be automatically adjusted based on the feedback signal as stable alternating current steady voltage plug exports to threephase load, and voltage stabilizer self power consumption is few, and voltage-regulation is rapid.
Further, the present invention also comprises filter unit, and filter unit is made up of the filter capacitor be serially connected in respectively between output end of pressure-stabilizing three-phase line and common port, can carry out filtering to the high-frequency harmonic in output voltage.
Further, in the present invention, current-limiting resistance is all Anti-surging thermistor.First electronic switch S1 and the second electronic switch S2 is the adjustable high speed electronic switch integrated chip of existing dutycycle, and it has port and control input end for regulating dutycycle.Voltage and current measurement unit can utilize existing voltage and current measurement circuit, the electric current and voltage analog quantity recorded is converted to digital quantity and is transferred to control module.Control module can select existing single-chip microcomputer, and gate-controlled switch can utilize relay auxiliary contact to realize, the power on/off of control module Single-chip Controlling relay coil, thus reaches the object controlling gate-controlled switch break-make.By the measurement of current/voltage, control module can judge the state of voltage stabilizer access power supply, thus control gate-controlled switch remains open state when plant-grid connection voltage stabilizer starts, and it is closed to control gate-controlled switch over time, thus by current-limiting resistance short circuit, avoid the electric energy loss on it.
The present invention also provides the control method based on above-mentioned hypervelocity energy-saving manostat, to the control method of the first electronic switch and the second electronic switch be wherein: the input voltage of mains connection is detected, and input voltage and set burning voltage compared:
When input voltage equals burning voltage, then the conducting of the first electronic switch and the second electronic switch is set to 50% respectively with cut-off dutycycle; And the first electronic switch is when being in conducting state, the second electronic switch is cut-off state;
When input voltage is less than burning voltage, then the dutycycle of the first electronic switch is set to be greater than 50%; And the first electronic switch is when being in conducting state, the second electronic switch is cut-off state;
When input voltage is greater than burning voltage, then the dutycycle of the first electronic switch is set to be less than 50%, and when the first electronic switch is in conducting state, the second electronic switch is cut-off state.
Beneficial effect of the present invention is: be different from traditional voltage stabilizing product: no industrial frequency transformer, can make that efficiency improves, weight saving thus improving SNR; No-ningerse transformer, structure is simple, and control flexibly, performance is good; Without controllable silicon, improve power factor, harmonic reduction disturbs.Considerably reduce weight and the size of voltage stabilizer self, product can be applicable to all electricity consumption occasions needing voltage stabilizing simultaneously, is particularly suitable for the occasion that small size is installed, will brings great economic benefit and social benefit to country.
Accompanying drawing explanation
Figure 1 shows that principle of the invention structural schematic block diagram;
Figure 2 shows that a kind of active channel schematic diagram in the course of work of the present invention;
Figure 3 shows that another kind of active channel schematic diagram in the course of work of the present invention;
Figure 4 shows that the third active channel schematic diagram in the course of work of the present invention;
Figure 5 shows that the 4th kind of active channel schematic diagram in the course of work of the present invention;
Figure 6 shows that the conducting time diagram of S1 and S2 in control method of the present invention;
Figure 7 shows that the circuit theory diagrams of S1 and S2.
Embodiment
Further illustrate below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, hypervelocity energy-saving alternating current stable-pressure device of the present invention, comprise mains connection Us and output end of stabilized voltage supply Uo, three-phase line between described mains connection Us and output end of stabilized voltage supply Uo is serially connected with successively first energy storage inductor L1, L2, L3, current-limiting resistance Rt1, Rt2, Rt3, storage capacitor C1, C2, C3, and second energy storage inductor L4, L5, L6; Each current-limiting resistance two ends respectively and be connected to gate-controlled switch K1, K2, K3; Also comprise control module, voltage detection unit, the first electronic switch S1 and the second electronic switch S2; The control input end connection control unit respectively of each gate-controlled switch K1, K2, K3; First electronic switch S1 and the second electronic switch S2 comprises control input end and three current input terminals respectively, wherein control input end connection control unit, three current input terminals of the first electronic switch S1 to be connected in three-phase line current-limiting resistance Rt1, Rt2, Rt3 and between storage capacitor C1, C2, C3, and three current input terminals of the second electronic switch S2 to be connected in three-phase line between storage capacitor C1, C2, C3 and second energy storage inductor L4, L5, L6; Voltage detection unit can adopt existing voltage sensor 1 and analog to digital converter 2 to realize, the input end of the voltage sensor 1 in voltage detection unit connects mains connection Us to detect input voltage, then convert through analog to digital converter 2 voltage signal detected to digital signal and export control module 3 to, control module 3 can select the miniature control chips such as existing single-chip microcomputer; Control module controls the on off state of gate-controlled switch K1, K2, K3 according to voltage signal, and the conducting of the first electronic switch S1 and the second electronic switch S2 and cut-off.
Also be serially connected with filter capacitor C4, C5, C6 between output end of pressure-stabilizing Uo three-phase line and common port, composition filter unit, to carry out filtering to the high-frequency harmonic in output voltage.Output end of pressure-stabilizing Uo is connected in series loop resistance R1, R2 and R3 respectively with on the three-phase line between common port.
The present invention is when applying, and the unstable voltage of civil power input can be automatically adjusted based on the feedback signal as stable alternating current steady voltage plug exports to threephase load, and without the need to transformer and the inverter circuit of traditional AC stabilizer, voltage stabilizer self power consumption is few, and voltage-regulation is rapid.
Embodiment
Current-limiting resistance Rt1, Rt2, Rt3 are all Anti-surging thermistor.The high speed electronic switch integrated chip that first electronic switch S1 and the second electronic switch S2 can adopt existing dutycycle adjustable, it has port and control input end for regulating dutycycle.Voltage and current measurement unit can utilize existing voltage and current measurement circuit, the electric current and voltage analog quantity recorded is converted to digital quantity and is transferred to control module.Control module can select existing single-chip microcomputer, and gate-controlled switch K1, K2, K3 can utilize relay auxiliary contact to realize, the power on/off of control module Single-chip Controlling relay coil, thus reaches the object controlling gate-controlled switch break-make.By the measurement of current/voltage, control module can judge the state of voltage stabilizer access power supply, thus control gate-controlled switch remains open state when plant-grid connection voltage stabilizer starts, and it is closed to control gate-controlled switch over time, thus by current-limiting resistance short circuit, avoid the electric energy loss on it.
To the method that the first electronic switch in hypervelocity energy-saving manostat of the present invention and the second electronic switch control be: the input voltage of mains connection Us is detected, and input voltage and set burning voltage are compared, this burning voltage artificially can be determined according to the electric pressure of voltage stabilizer practical application, then the comparative result utilizing voltage comparator to realize two magnitudes of voltage exports, after comparative result exports control module single-chip microcomputer to, single-chip microcomputer can control conducting and the cut-off of electronic switch according to comparative result; Or input to single-chip microcomputer after input voltage being converted into digital signal, compare with the prior set burning voltage writing single-chip microcomputer by software, and then acquisition comparative result, control electronic switch conducting or cut-off, said method all can utilize existing software engineering to realize.
Please refer to Fig. 7, electronic switch S1, S2 of the present invention also can adopt illustrated circuit principle, and each electronic switch module is made up of three groups of turn-off thyristor GTO, and GTO also can substitute with the existing controlled power device such as IGBT or MCT, IGCT.Often group is oppositely and in the turn-off thyristor GTO connect, the gate pole 1-6 of 6 GTO is the control end of electronic switch, the port of corresponding electronic switch 1.-6.; The pole, residue the two poles of the earth one of GTO is used for the phase connected respectively in three-phase line, namely port 7.-9.; Ground connection after three groups, another pole connects, namely port 10..For the electronic switch shown in Fig. 7, be prior art by the method for the turn-on and turn-off time thus adjustment dutycycle size that control 6 GTO wherein.
Please refer to Fig. 6, the concrete control method of the present invention to electronic switch is:
When input voltage equals burning voltage, then the conducting of the first electronic switch and the second electronic switch is set to 50% respectively with cut-off dutycycle;
When input voltage is less than burning voltage, then the first electronic switch dutycycle is set to be greater than 50%;
When input voltage is greater than burning voltage, then the first electronic switch dutycycle is set to be less than 50%;
And under above-mentioned three kinds of control methods, when the first electronic switch is in conducting state, the second electronic switch is cut-off state.
Control principle of the present invention is specially: the three-phase mains voltage Us for instability of mains electricity input end input, current-limiting resistance Rt1, Rt2, Rt3 are existing special Anti-surging thermistors, for preventing electric current too high when starting, play the effect of current limliting, after startup terminates, namely make its current-limiting resistance Rt1, Rt2, Rt3 short circuit by control module control gate-controlled switch K1-K3 is closed.S1 and S2 is existing high speed electronic switch device chip, within 0.02 second cycle (power frequency 50 hertz) of three-phase mains voltage, and the conducting of S1 and S2 high frequency or cut-off.
At the T of S1
oN(conducting) period, S2 cut-off simultaneously, three-phase supply passes through inductance L
1, L
2, L
3loop is formed with S1, for A phase loop, as shown in Figure 2, now:
Supply voltage U
s1all be added in inductance L
1on, so L
1on pressure drop be U
s1, can obtain according to Faraday's electromagnetic induction law:
Through T
oNafter time, L
1on current increment be:
(in formula,
for S1 dutycycle, T
s=T
oN+ T
oFFfor turn-on cycle).
And at the T of S1
oFF(cut-off) period, simultaneously S2 conducting, three-phase supply passes through inductance L
1, L
2, L
3, electric capacity C
1, C
2, C
3loop is formed with S2, for A phase loop, as shown in Figure 3, now:
L
1on pressure drop be:
Can obtain:
Through T
oFFafter time, L
1on current increment be:
(in formula,
for the dutycycle of S1 conducting, T
s=T
oN+ T
oFFfor turn-on cycle).
According to steady state conditions: Δ i
l1 (ON)=| Δ i
l1 (OFF)|
Can obtain:
Can be obtained by abbreviation:
1.
Further, consider to export loop, for A phase: at the T of next S1
oN(conducting) period, S2 cut-off simultaneously, S1, C
1, L
4with load R
1form a path, as shown in Figure 4, now:
L
4on pressure drop be: U
l4=U
c1-U
o1
Can obtain:
Through T
oNafter time, L
4on current increment be:
And at the T of next S1
oFF(cut-off) period, simultaneously S2 conducting, S2, L
4with load R
1form a path, as shown in Figure 5, now:
L
4on pressure drop be:
Through T
oFFafter time, L
4on current increment be:
Due to the conducting at S2 with between the off period, inductance L
4on electric current can not undergo mutation, so there is steady state conditions be: Δ i
l4 (ON)=| Δ i
l4 (OFF)|
So,
Can obtaining of solution:
②
(in formula,
for the dutycycle of S1 conducting, T
s=T
oN+ T
oFFfor turn-on cycle).
1. formula of inciting somebody to action substitutes into 2. formula and solves:
Therefore work as D
1when=50%, U
o1=U
s1
D
1during >50%, U
o1> U
s1
D
1during <50%, U
o1< U
s1
In other words namely:
When input voltage equals burning voltage, by D
1be set to equal 50%, can voltage stabilizing be realized;
When input voltage is less than burning voltage, by D
1be set to be greater than 50%, can voltage stabilizing be realized;
When input voltage is greater than burning voltage, by D
1be set to be less than 50%, can voltage stabilizing be realized.
D
1the occurrence arranged can by detecting current input voltage, then based on experience value or actual needs arrange, only need meet above-mentioned setting model.
Adopt structure of voltage regulation of the present invention and control method, without the need to adopting traditional transformer or inverter, only need, by the dutycycle of high speed electronic switch S1 and S2 of change, output voltage can be made to reach burning voltage, and electronic speed regulation than mechanical speed governors sooner, more accurate, weight is lighter.
Claims (3)
1. the control method of a hypervelocity energy-saving alternating current stable-pressure device, it is characterized in that, hypervelocity energy-saving alternating current stable-pressure device comprises mains connection and output end of stabilized voltage supply, the three-phase line between described mains connection and output end of stabilized voltage supply is serially connected with successively the first energy storage inductor, current-limiting resistance, storage capacitor and the second energy storage inductor;
Above-mentioned each current-limiting resistance two ends respectively and be connected to gate-controlled switch;
Hypervelocity energy-saving alternating current stable-pressure device also comprises control module, voltage detection unit, the first electronic switch and the second electronic switch;
The control input end connection control unit of gate-controlled switch; First electronic switch and the second electronic switch comprise control input end and three current input terminals respectively, wherein control input end connection control unit, three current input terminals of the first electronic switch are connected in three-phase line between current-limiting resistance and storage capacitor, and three current input terminals of the second electronic switch to be connected in three-phase line between storage capacitor and the second energy storage inductor; The input end of voltage detection unit connects mains connection to detect input voltage, then exports the voltage signal detected to control module;
Control module controls the on off state of gate-controlled switch according to input voltage, and the conducting of the first electronic switch and the second electronic switch and cut-off, that is:
Input voltage and set burning voltage are compared,
When input voltage equals burning voltage, then the conducting of the first electronic switch and the second electronic switch is set to 50% respectively with cut-off dutycycle;
When input voltage is less than burning voltage, then the dutycycle of the first electronic switch is set to be greater than 50%;
When input voltage is greater than burning voltage, then the dutycycle of the first electronic switch is set to be less than 50%;
And when the first electronic switch is in conducting state, the second electronic switch is cut-off state.
2. method according to claim 1, is characterized in that, hypervelocity energy-saving alternating current stable-pressure device also comprises filter unit, and filter unit is made up of the filter capacitor be serially connected in respectively between output end of pressure-stabilizing three-phase line and common port.
3. method according to claim 1, is characterized in that, in hypervelocity energy-saving alternating current stable-pressure device, described current-limiting resistance is all Anti-surging thermistor.
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