CN101834441B - User power supply voltage and load current control device working according to electric network requirements and user need - Google Patents
User power supply voltage and load current control device working according to electric network requirements and user need Download PDFInfo
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- CN101834441B CN101834441B CN2010101814634A CN201010181463A CN101834441B CN 101834441 B CN101834441 B CN 101834441B CN 2010101814634 A CN2010101814634 A CN 2010101814634A CN 201010181463 A CN201010181463 A CN 201010181463A CN 101834441 B CN101834441 B CN 101834441B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention relates to a user power supply voltage and load current control device working according to electric network requirements and user need, comprising a user power supply voltage control unit and a load current control unit, wherein the user power supply voltage control unit comprises a voltage transformator, a standard voltage generator, a first comparator, a first amplifier and a backcoupling transformer; and the load current control unit comprises a current transformator, a first current/voltage converter, a standard current generator, a second current/voltage converter, a second comparator, a fixing amplifier and a first coupling transformer. The user power supply voltage and load current control device is green and environment-friendly and has good quality, high efficiency, high speed, and the like, and voltage and current controlled by the user power supply voltage and load current control device can greatly increase the power quality of power supply and power utilization.
Description
Technical field
The present invention relates to a kind of user's supply power voltage and the load current controlling device that need administer by electrical network requirement and user, belong to AC power equipment.
Background technology
Bigger departing from taken place in voltage and current between some desired indicator of electrical network actual motion neutralization, therefore need administer.At present, all be single to the improvement method of voltage, electric current, do not have each other and be closely connected, and be to adopt means of different to accomplish.As administer and adopt pressurizer the voltage effective value; Administer voltage waveform and generally adopt filter; Administer current effective value and generally adopt flow straightener, administer reactive current and generally adopt reactive current compensator, administer harmonic current and generally adopt harmonic current arrester etc.These are administered all is to obtain a result through test, after analyzing, calculating to handle again, and processing speed is relatively slow, and aspect voltage improvement, is target with the rated condition just, is being to be target with bad electric current limited degree aspect the electric current improvement.
Summary of the invention
Technical problem to be solved by this invention provides a kind of user's supply power voltage and the load current controlling device of in a power frequency period, the amplitude of voltage and current and waveform being controlled that need administer by electrical network requirement and user.
The technical solution adopted for the present invention to solve the technical problems:
The present invention is made up of user's supply power voltage governance unit and load current governance unit; Said user's supply power voltage governance unit is made up of voltage transformer, standard capacitance box, first comparator, first amplifier, reverse coupled transformer; Elementary and the line voltage U of said voltage transformer
InParallel connection; A secondary input that connects said first comparator of said voltage transformer; Another input of said first comparator of output termination of said standard capacitance box; The output of said first comparator connects the elementary of said reverse coupled transformer through said first amplifier, the secondary and line voltage U of said reverse coupled transformer
InSeries connection;
Said load current governance unit is by current transformer, first current/voltage converter, standard current generator, second current/voltage converter, second comparator, fixedly amplifier, first coupling transformer are formed; Elementary and the load of said current transformer is connected; The secondary input that connects first current/voltage converter of said current transformer; An input of said second comparator of output termination of said first current/voltage converter, the output voltage of said first current/voltage converter is U
yThe input of said second current/voltage converter of output termination of said standard current generator, the output voltage of said second current/voltage converter is U
x, another input of said second comparator of output termination of said second current/voltage converter, the output voltage of said second comparator is U
XyThe output voltage U of said second comparator
XyOutput voltage U with said second current/voltage converter
xConnect said fixedly amplifier input terminal after the series connection; Said first coupling transformer of output termination of said fixedly amplifier elementary, the secondary two ends that are connected in parallel on by the elementary branch road that is composed in series of said load and current transformer of said first coupling transformer.
Operation principle of the present invention is following:
The present invention need not test calculating; But utilize normal voltage and the normalized current of changing artificial making to compare with virtual voltage and actual current respectively; Find out difference is amplified to certain power again through amplifier form fast return primary circuit; With counteracting offset voltage or electric current, thereby obtain desirable voltage and current, reached the purpose of administering voltage and current.
Beneficial effect of the present invention is following:
The normal voltage of (1) making, the normalized current stability should be more than 500ms, and as far as a power frequency period 20ms, normal voltage or normalized current are metastable.The present invention is continuous to the Signal Processing process, and the entire process process is about 1ms, and processing speed is exceedingly fast, and result can satisfy the needs of engineering.
(2) this device is to administer by the perfect condition of user and electrical network, can voltage be provided by user's needs, and the electric current that can let electrical network need according to the demand of electrical network returns electrical network, and the unwanted electric current of electrical network has the loop of one's own, has reached the harmonious state of power supply and electricity consumption.Voltage and current stability and waveform distortion after this device is administered all can reach more than 1%.
(3) this device is to realize the improvement to a certain quality of power supply through the standard of changing voltage, electric current., user's operational mode can change standard when having bigger variation by demand.
(4) voltage and the supply power voltage after the improvement is irrelevant relatively, and only relevant with the size and the waveform of normal voltage, the voltage after the improvement just looks like that the voltage that is come out by normal voltage " clone " is the same.
(5) electric current after the improvement has only ideal current to return electrical network, and its aftercurrent has the loop of one's own through this device, no longer returns electrical network, just looks like to have separated load current equally, has reduced burden and pollution to electrical network so greatly.
(6) user can be according to need of work individual tab or associating option in five voltage abatement functions and five electric current abatement functions.The power controlling of associating option is individual tab each item power controlling sum.
(7) (offset voltage rate multiply by load current or supply power voltage multiply by depart from electric current) is about 10% of whole bearing power because offset power, saidly offset power is withdrawn into normal desired indicator only needs 10% of bearing power.
(8) this device applied range utilizes the device of principles of the present invention, and its capacity is minimum, begins from 500W, and its heap(ed) capacity can supply family enterprise to use by the capacity decision of power electronic device.
In sum, this device has green, environmental protection, high-quality, characteristics such as efficient, quick, and the voltage and current after this device is administered will make the quality of power supply of power supply and electricity consumption improve greatly.
Description of drawings
Fig. 1 is a theory diagram of the present invention.
Fig. 2 is the installation site sketch map of voltage and current transformer, reverse coupled transformer and first coupling transformer.
Fig. 3 is the circuit theory diagrams of user's supply power voltage governance unit.
Fig. 4 is the circuit theory diagrams with second comparator of current stabilization effect.
Fig. 5 is for increasing the circuit theory diagrams of second comparator that the compensating reactive power function of current is arranged on the basis of Fig. 4.
Fig. 6 is for increasing the circuit theory diagrams that second comparator that suppresses the harmonic current effect is arranged on the basis of Fig. 5.
Fig. 7 is the fixing circuit theory diagrams of amplifier.
In Fig. 1-7, the model of IC1-IC8 is: μ A741, and the model of Q1-Q4 is BUS14, and A is the A phase of three-phase alternating-current supply, and N is the zero line of three-phase alternating-current supply, U
x: be the voltage (i.e. the output voltage of second current/voltage converter) of normalized current behind second current/voltage converter that standard current generator produces, U
y: be the voltage (i.e. the output voltage of first current/voltage converter) of load current behind first current/voltage converter of current transformer sampling, U
Xy: be the output voltage of second comparator, U
XyComprise U
Xy1-U
Xy3, U
Xy1: be the output voltage of second comparator, U with stabling current effect
Xy2: at U
Xy1The basis on increase the output voltage of second comparator that the compensating reactive power function of current is arranged, U
Xy3: at U
Xy2The basis on increase the output voltage that second comparator that suppresses the harmonic current effect is arranged, Ub: be the normal voltage that standard capacitance box produces, U
In: mains supply voltage, U
In/ A: the sampled voltage of voltage transformer; U1: for after treatment, by the transformer coupled voltage in the current supply circuit of reverse coupled, U2: after load is departed from current processing with the difference of mains supply voltage and normal voltage; Be coupled by first coupling transformer again; And then the voltage on the formation branch road parallelly connected with load, IBQ: standard current generator, I
b: normalized current.
Embodiment
Embodiment by shown in Fig. 1-7 can know that it is made up of user's supply power voltage governance unit and load current governance unit; Said user's supply power voltage governance unit is made up of voltage transformer, standard capacitance box, first comparator, first amplifier, reverse coupled transformer; Elementary and the line voltage U of said voltage transformer
InParallel connection; A secondary input that connects said first comparator of said voltage transformer; Another input of said first comparator of output termination of said standard capacitance box; The output of said first comparator connects the elementary of said reverse coupled transformer through said first amplifier, the secondary and line voltage U of said reverse coupled transformer
InSeries connection;
Said load current governance unit is by current transformer, first current/voltage converter, standard current generator, second current/voltage converter, second comparator, fixedly amplifier, first coupling transformer are formed; Elementary and the load of said current transformer is connected; The secondary input that connects first current/voltage converter of said current transformer; An input of said second comparator of output termination of said first current/voltage converter, the output voltage of said first current/voltage converter is U
yThe input of said second current/voltage converter of output termination of said standard current generator, the output voltage of said second current/voltage converter is U
x, another input of said second comparator of output termination of said second current/voltage converter, the output voltage of said second comparator is U
XyThe output voltage U of said second comparator
XyOutput voltage U with said second current/voltage converter
xConnect said fixedly amplifier input terminal after the series connection; Said first coupling transformer of output termination of said fixedly amplifier elementary, the secondary two ends that are connected in parallel on by the elementary branch road that is composed in series of said load and current transformer of said first coupling transformer.
The voltage transformer of said user's supply power voltage governance unit is T1; Said first comparator is made up of operational amplifier IC1, resistance R 1-R4; Negative input 2 pin of operational amplifier IC1 connect an end of T1 level of voltage transformer through resistance R 1; The other end ground connection of T1 level of voltage transformer, positive input 3 pin of operational amplifier IC1 meet the normal voltage U of the output of standard capacitance box through resistance R 2
bAn end, normal voltage U
bOther end ground connection, resistance R 4 is connected between 3 pin and ground of operational amplifier IC1, resistance R 3 is connected between 6 pin and 2 pin of operational amplifier IC1;
Said first amplifier is made up of the voltage amplifier and first power amplifier; Said voltage amplifier is made up of operational amplifier IC2, resistance R 5-R7; Negative input 2 pin of operational amplifier IC2 connect output 6 pin of operational amplifier IC1 through resistance R 5; Resistance R 7 is connected between 3 pin and ground of operational amplifier IC2, and resistance R 6 is connected between 6 pin and 2 pin of operational amplifier IC2; Said first power amplifier is the push-pull amplifier of being made up of transistor Q1-Q2, the second coupling transformer T2, resistance R 8-R10; The second coupling transformer T2 elementary is connected between output 6 pin and ground of operational amplifier IC2; The secondary base stage that meets transistor Q1 and Q2 respectively of the second coupling transformer T2, the centre cap of T2 level of second coupling transformer meets Vcc through resistance R 8 with R9 respectively
1And ground; The emitter parallel connection of transistor Q1 and Q2 is after resistance R 10 ground connection; The collector electrode of transistor Q1 and Q2 connects the elementary of said reverse coupled transformer T3 respectively, and the elementary centre cap of said reverse coupled transformer T3 meets Vcc
1
The normal voltage U of said standard capacitance box output
bBe in following any:
(1) said normal voltage U
bWaveform be sinusoidal wave;
(2) said normal voltage U
bEffective value be 220V/A, wherein A is the no-load voltage ratio coefficient of said voltage transformer T1;
(3) said normal voltage U
bEffective value be the 1/A of the voltage of user's appointment;
(4) said normal voltage U
bEffective value be 220V/A, and its waveform is sinusoidal wave;
(5) said normal voltage U
bEffective value be 220V/A, and its waveform is harmonic voltage of sine-wave superimposed.
The current transformer of said load current governance unit is T4, and the elementary L1 of current transformer T4 connects with load Z; Said first current/voltage converter is made up of resistance R 12; Resistance R 12 and an end ground connection after the secondary L2 of current transformer T4 is parallelly connected, its other end is the E point; Said second current/voltage converter is made up of resistance R 11; Resistance R 11 and an end ground connection after said standard current generator IBQ is parallelly connected, its other end is the D point;
Said second comparator is made up of operational amplifier IC3, resistance R 13-R16; Positive input 3 pin of operational amplifier IC3 connect said D point through resistance R 14; Negative input 2 pin of operational amplifier IC3 connect said E point through resistance R 13; Resistance R 15 is connected between 3 pin and ground of operational amplifier IC3; Resistance R 16 is connected between 6 pin and 2 pin of operational amplifier IC3, and the output voltage of operational amplifier IC3 is Uxy
1
Said fixedly amplifier is made up of the first reverse voltage amplifier, first phase shifter, the second reverse voltage amplifier, second power amplifier; The output of the first reverse voltage amplifier connects the input of second power amplifier successively through first phase shifter, the second reverse voltage amplifier; The said first coupling transformer T6's of the output termination of said second power amplifier is elementary, and the elementary centre cap of the first coupling transformer T6 meets Vcc
1The said first reverse voltage amplifier is made up of operational amplifier IC6, resistance R 23-R24, potentiometer RW1; The output voltage U of said second comparator
XyOutput voltage U with said second current/voltage converter
xOne end of the branch road after the series connection connects negative input 2 pin of operational amplifier IC6, the other end ground connection of said branch road through resistance R 23; Resistance R 24 is connected between positive input 3 pin and ground of operational amplifier IC6, and potentiometer RW1 is connected between 6 pin and 2 pin of operational amplifier IC6; Said first phase shifter is made up of operational amplifier IC7, resistance R 25-R26, potentiometer RW2, capacitor C 2; Negative input 2 pin of operational amplifier IC7 connect output 6 pin of operational amplifier IC6 through resistance R 25; Capacitor C 2 be connected between output 6 pin and ground of operational amplifier IC6 after potentiometer RW2 connects; The end ground connection of potentiometer RW2, positive input 3 pin of operational amplifier IC7 connect the node of capacitor C 2 and potentiometer RW2; Resistance R 26 is connected between 6 pin and 2 pin of operational amplifier IC7; The said second reverse voltage amplifier is made up of operational amplifier IC8, resistance R 27-R28, potentiometer RW3; Negative input 2 pin of operational amplifier IC8 connect output 6 pin of operational amplifier IC7 through resistance R 27, and resistance R 28 is connected between positive input 3 pin and ground of operational amplifier IC8, and potentiometer RW3 is connected between 6 pin and 2 pin of operational amplifier IC8; Said second power amplifier is the push-pull amplifier of being made up of transistor Q3-Q4, the 3rd coupling transformer T5, resistance R 29-R31; The 3rd coupling transformer T5 elementary is connected between output 6 pin and ground of operational amplifier IC8; The secondary base stage that meets transistor Q3 and Q4 respectively of the 3rd coupling transformer T5, the centre cap of T5 level of the 3rd coupling transformer meets Vcc through resistance R 29 with R30 respectively
1And ground; The emitter parallel connection of transistor Q3 and Q4 is after resistance R 31 ground connection; The collector electrode of transistor Q3 and Q4 connects the elementary of the said first coupling transformer T6 (its no-load voltage ratio is 1: 1) respectively, and the elementary centre cap of the said first coupling transformer T6 meets Vcc
1, the branch road parallel connection of forming after the elementary L1 secondary and by load Z summation current transformer of the said first coupling transformer T6 connects.
In the present embodiment, in said second comparator, be provided with the 3rd reverse voltage amplifier that is used for the compensating reactive power electric current, said the 3rd reverse voltage amplifier is made up of operational amplifier IC4, resistance R 17-R19; Negative input 2 pin of operational amplifier IC4 connect output 6 pin of operational amplifier IC3 through resistance R 17, and resistance R 18 is connected between positive input 3 pin and ground of operational amplifier IC4, and resistance R 19 is connected between 6 pin and 2 pin of operational amplifier IC4; The output voltage of operational amplifier IC4 is Uxy
2
In the present embodiment, in said second comparator, also be provided with second phase shifter that is used to suppress harmonic current, said second phase shifter is made up of operational amplifier IC5, resistance R 20-R21, potentiometer RW4, capacitor C 1; Negative input 2 pin of operational amplifier IC5 connect output 6 pin of operational amplifier IC4 through resistance R 20; Capacitor C 1 be connected between output 6 pin and ground of operational amplifier IC4 after potentiometer RW4 connects; The end ground connection of potentiometer RW4; The node of capacitor C 1 and potentiometer RW4 connects positive input 3 pin of operational amplifier IC5, and resistance R 21 is connected between 6 pin and 2 pin of operational amplifier IC5; The output voltage of operational amplifier IC5 is Uxy
3
The operation principle of user's supply power voltage governance unit is (referring to Fig. 2 and Fig. 3) as follows:
Make a normal voltage U
b, U
bIdentical with the supply power voltage frequency, phase place is identical, waveform is good, effective value is stable, and is applicable to the electronic device computing.Make normal voltage U
bBe desired voltage 1/A doubly; To supply power voltage continuous sampling, the no-load voltage ratio coefficient of voltage transformer is 1/A with voltage transformer, and sampled voltage is U
In/ A compares normal voltage and sampled voltage in first comparator, result is relatively sent into first amplifier amplify, and first amplifier comprises the voltage amplifier and first power amplifier, amplifies β altogether doubly, makes β=A; Voltage after the amplification is offset voltage.Offset voltage is transformer coupled to current supply circuit (being U1) through 1: 1 reverse coupled, then offset the part that departs from the supply power voltage, the output voltage that obtains like this is exactly to administer the desired voltage of getting well.
User's supply power voltage governance unit has following five voltage abatement functions:
(1) supply power voltage to load has pressure stabilization function:
Make a normal voltage, make its effective value be stabilized in 220V/A, wherein get A=44, U
In/ A and normal voltage are sent into the first comparator IC1 shown in Figure 3 simultaneously, and doubly (return grid power supply circuit after making β=A), offset the deviation of supply power voltage amplitude, its new supply power voltage effective value is stabilized in 220V amplify β through first amplifier again.Be that this device can be used as the AC voltage regulator use.
(2) eliminating supply power voltage because the pollution that harmonic wave causes, is electric again after will contaminated supply power voltage being reduced to sine wave:
Make a normal voltage; Make its waveform for sinusoidal wave; When supply power voltage is contaminated when containing high order harmonic component; Itself and normal voltage sent in first comparator shown in Figure 3 simultaneously compare, amplify β through first amplifier again and doubly (return power supply circuits after making β=A) find out its difference, offset supply power voltage and depart from sinusoidal part.New supply power voltage is sine wave.Be that this device can be used as the alternating current filter use.
(3) this device has the effect of output given voltage:
Make a normal voltage and make the 1/A of its effective value, during like user's given voltage U=228V, 228V/A and U for user's given voltage
In/ A sends into first comparator shown in Figure 3 simultaneously, and comparative result amplifies β through first amplifier and doubly (returns grid power supply circuit after making β=A), offset the deviation of supply power voltage effective value.Its new supply power voltage is stabilized in 228V, and like this as far as the user, product quality is best, most effective.Be that this device can be used as the use of given voltage follower.
(4) this device has played the effect of exportable rated voltage:
Make a normal voltage, make its effective value be stabilized in 220V/A, waveform is sinusoidal wave.With U
In/ A and normal voltage are sent into first comparator shown in Figure 3 simultaneously, amplify β through first amplifier again and doubly (return grid power supply circuit after making β=A), offset departing from and offsetting the part that the supply power voltage waveform departs from sine of supply power voltage effective value.Be that this device can be used as the use of rated voltage follower.
(5) this device has the effect that suppresses harmonic current in the load:
Make the normal voltage U of a harmonic voltage of stack on the basis of above-mentioned (4) normal voltage
bWith U
In/ A and U
bSend into first comparator shown in Figure 3 simultaneously; Amplify β through first amplifier again and doubly (return power supply circuits after making β=A); Obtain new supply power voltage; This voltage is added in has the electric current maximum sinusoidal rippleization that can make its retrieval system on the nonlinear load circuit, and this voltage does not influence the former situation of system's supply power voltage.
The operation principle of load current governance unit is following:
When if single phase alternating current (A.C.) voltage is added in the load two ends, in load, will have alternating current to flow through, its size and waveform are relevant with institute's making alive and impedance property, this alternating current actual current I
s, the electric current of administering needs is regarded as by two parts and formed: the electric current that promptly flows back to electrical network to hope is ideal current I
L, the electric current of not hoping to return electrical network departing from electric current I
PDeparting from electric current may cause burden to pollute in other words to electrical network.To depart from electric current I
PAfter this device electron process, become corresponding offset voltage U2, above-mentioned offset voltage is added in the two ends of load Z, this moment, offset voltage was that load provides a new current path, forced and departed from electric current I
PNo longer flow back to current supply circuit.Thereby accomplished the afterflow effect that departs from electric current.Burden and pollution have been alleviated so greatly to electrical network.
Specific practice is; With actual current I
sRegard as by two parts and form, a part is ideal current I
L, another part is for departing from electric current I
PIs＝I
L+I
P。As shown in Figure 2, be a normalized current I
b, make I
b=I
L, and make I
bIdentical with the supply power voltage frequency, waveform stabilization, phase stabilization, amplitude stability.With this normalized current I
bConvert voltage U to through second current/voltage converter
xWith I
sAfter 1: 1 current transformer sampling, convert voltage U to through first current/voltage converter again
yWith U
xWith U
ySend into the second comparison amplifier IC3 simultaneously and (see that Fig. 4-Fig. 6), the positive input of IC3 meets U
x, its negative input meets U
y, the voltage of second comparator output is offset voltage U
Xy(U
Xy1, U
Xy2, U
Xy3), with U
Xy(U
Xy1, U
Xy2, U
Xy3) and U
xResult's conduct after the stack is the input signal (see figure 7) of amplifier fixedly.Fixedly amplifier is as shown in Figure 7, and its total magnification is α times, and phase shifting angle is γ, and the no-load voltage ratio of the first coupling transformer T6 is 1: 1.
Work as U
Xy=0 o'clock, only remaining U
xWhen adjustment fixedly the amplifier amplification quantity be that α and phase shifting angle are that γ makes the output voltage U 2 of fixing amplifier and the supply power voltage U of load Z
InCan realize U2 and U when identical
InParallel connection, this moment U2 and U
InParallel connection is load Z power supply simultaneously, but U2 this moment provides electric current for load Z, just look like generator in the electrical network just be incorporated into the power networks do not generate electricity the same.
Work as U
Xy≠ 0 o'clock, said output voltage U 2 will be done corresponding variation, and U2 is the electric current I that departs from the load
PA new passage is provided, has accomplished and departed from electric current I
PThe afterflow effect.Depart from electric current I this moment
PNo longer return current supply circuit, depart from electric current I
PJust look like by new passage bypass the same.
The load current governance unit has following five electric current abatement functions:
(1) this device has played the effect of stable alternating current:
When having only active current in the load circuit, be a normalized current I
bMake it equal ideal current I
L, with normalized current I
bSend into second current/voltage converter and convert U into
x, again with actual current I
sElectric current after the sampling converts voltage U to through first current/voltage converter
y, as shown in Figure 4, with U
x, U
ySend into the input of the second comparator IC3 simultaneously; This moment, the output voltage of IC3 was U
Xy1, U
Xy1With U
xSend into fixedly amplifier input terminal after the stack, then said output voltage U 2 changes, and its result causes the electric current that departs from the load to do opposite variation, so the electric current in the load has obtained stable.Played the effect of alternating current stabilizer.
(2) device provides reactive current for load, has reduced the output of system to reactive current, has enlarged the capacity (see figure 5) of system.
When stream in the load has inductive and resistive electric current, make a normalized current I
bMake it consistent with resistive power frequency, phase place, equal and opposite in direction, waveform.With I
bConvert voltage U to through second current/voltage converter
x, getting actual current is I
sConvert voltage U to through first current/voltage converter
yAs shown in Figure 5, with U
xWith U
ySend into the second comparator IC3 simultaneously, and comparative result is sent into multiplication factor is 1 the 3rd reverse voltage amplifier, this moment, the 3rd reverse voltage discharger IC4 was output as U
Xy2, U
Xy2With U
xSend into fixedly amplifier input terminal after the stack, output voltage U 2 changes.U2 is that the reactive current in the load provides new current channel.Reactive current in the load is no longer provided by supply power voltage but is provided by U2.Alleviate the burden of system like this, played the effect of reactive current compensator.
(3) device has played the effect (see figure 6) of eliminating harmonic current in the load:
When stream in the load has active current, reactive current and non-linear current, be a normalized current I
bFor linear current (wherein contain meritorious electric current and reactive current) with I
bConvert voltage U to through second current/voltage converter
x, get actual current I
sConvert voltage U to through first current/voltage converter
yAs shown in Figure 6, with U
xWith U
ySend into the second comparator IC3 simultaneously, relatively result is sent into the 3rd reverse voltage amplifier IC4 that multiplication factor is n α after, sending into the phase shift angle again is the second phase shifter IC5 of m γ, this moment, the voltage of IC5 output was U
Xy3U
Xy3With U
xSend into fixedly amplifier input terminal after the stack, output voltage U 2 change (can adjust n α and m γ make the corresponding change of U2 make its change electric current that on load Z, produces as far as possible with to depart from electric current consistent).This device provides new current channel for the harmonic current in the load, and the harmonic current in the load no longer flows back to current supply circuit.Played the effect of harmonic current arrester.
(4) this device has limited the ratio that active current, reactive current harmonic electric current return current supply circuit, has satisfied the power supply of system safety economy.
When stream in the load has the resultant current of active current, reactive current harmonic electric current, by a certain percentage above-mentioned three kinds of electric currents are made a normalized current, handling then by said procedure, the electric current of retrieval system is exactly a normalized current ideal current just.And all the other depart from electric current and provide the path self-organizing system no longer to return current supply circuit by U2.This device has played the effect of restriction harmonic current retrieval system.
(5) when needing in the load to reduce reactive current harmonic electric current, can use passive device to reduce part reactive current harmonic electric current earlier, the way that remainder then utilizes this device to use continues to accomplish.Because this method strengthened dynamic improvement, not only economic effect but also good.
Claims (1)
1. a user's supply power voltage and the load current controlling device that need administer by electrical network requirement and user is characterized in that it is made up of user's supply power voltage governance unit and load current governance unit; Said user's supply power voltage governance unit is made up of voltage transformer, standard capacitance box, first comparator, first amplifier, reverse coupled transformer; Elementary and the line voltage U of said voltage transformer
InParallel connection; A secondary input that connects said first comparator of said voltage transformer; Another input of said first comparator of output termination of said standard capacitance box; The output of said first comparator connects the elementary of said reverse coupled transformer through said first amplifier, the secondary and line voltage U of said reverse coupled transformer
InSeries connection;
Said load current governance unit is by current transformer, first current/voltage converter, standard current generator, second current/voltage converter, second comparator, fixedly amplifier, first coupling transformer are formed; Elementary and the load of said current transformer is connected; The secondary input that connects first current/voltage converter of said current transformer; An input of said second comparator of output termination of said first current/voltage converter, the output voltage of said first current/voltage converter is U
yThe input of said second current/voltage converter of output termination of said standard current generator, the output voltage of said second current/voltage converter is U
x, another input of said second comparator of output termination of said second current/voltage converter, the output voltage of said second comparator is U
XyThe output voltage U of said second comparator
XyOutput voltage U with said second current/voltage converter
xConnect said fixedly amplifier input terminal after the series connection; Said first coupling transformer of output termination of said fixedly amplifier elementary, the secondary two ends that are connected in parallel on by the elementary branch road that is composed in series of said load and current transformer of said first coupling transformer;
The voltage transformer of said user's supply power voltage governance unit is T1; Said first comparator is made up of operational amplifier IC1, resistance R 1-R4; Negative input 2 pin of operational amplifier IC1 connect an end of T1 level of voltage transformer through resistance R 1; The other end ground connection of T1 level of voltage transformer, positive input 3 pin of operational amplifier IC1 meet the normal voltage U of standard capacitance box output through resistance R 2
bAn end, normal voltage U
bOther end ground connection, resistance R 4 is connected between 3 pin and ground of operational amplifier IC1, resistance R 3 is connected between 6 pin and 2 pin of operational amplifier IC1;
Said first amplifier is made up of the voltage amplifier and first power amplifier; Said voltage amplifier is made up of operational amplifier IC2, resistance R 5-R7; Negative input 2 pin of operational amplifier IC2 connect output 6 pin of operational amplifier IC1 through resistance R 5; Resistance R 7 is connected between positive input 3 pin and ground of operational amplifier IC2, and resistance R 6 is connected between 6 pin and 2 pin of operational amplifier IC2; Said first power amplifier is the push-pull amplifier of being made up of transistor Q1-Q2, the second coupling transformer T2, resistance R 8-R10; The second coupling transformer T2 elementary is connected between output 6 pin and ground of operational amplifier IC2; The secondary base stage that meets transistor Q1 and transistor Q2 respectively of the second coupling transformer T2, the centre cap of T2 level of second coupling transformer meets Vcc through resistance R 8 and resistance R 9 respectively
1And ground; The emitter parallel connection of transistor Q1 and transistor Q2 is after resistance R 10 ground connection; The collector electrode of transistor Q1 and transistor Q2 connects the elementary of said reverse coupled transformer respectively, and the centre cap of said reverse coupled primary meets Vcc
1
The normal voltage U of said standard capacitance box output
bBe in following any:
(1) said normal voltage U
bWaveform be sinusoidal wave;
(2) said normal voltage U
bEffective value be 220V/A;
(3) said normal voltage U
bEffective value be the 1/A of the voltage of user's appointment;
(4) said normal voltage U
bEffective value be 220V/A, and its waveform is sinusoidal wave;
(5) said normal voltage U
bEffective value be 220V/A, and its waveform is harmonic voltage of sine-wave superimposed;
A in above-mentioned (1)-(5) is the no-load voltage ratio coefficient of said voltage transformer T1;
The current transformer of said load current governance unit is T4, and the elementary L1 of current transformer T4 connects with load; Said first current/voltage converter is made up of resistance R 12; Resistance R 12 and an end ground connection after the secondary L2 of current transformer T4 is parallelly connected, its other end is the E point; Said second current/voltage converter is made up of resistance R 11; Resistance R 11 and an end ground connection after said standard current generator is parallelly connected, its other end is the D point;
Said second comparator comprises operational amplifier IC3, resistance R 13-R16; Positive input 3 pin of operational amplifier IC3 connect said D point through resistance R 14; Negative input 2 pin of operational amplifier IC3 connect said E point through resistance R 13; Resistance R 15 is connected between 3 pin and ground of operational amplifier IC3; Resistance R 16 is connected between 6 pin and 2 pin of operational amplifier IC3, and the output voltage of operational amplifier IC3 is Uxy
1
Said fixedly amplifier is made up of the first reverse voltage amplifier, first phase shifter, the second reverse voltage amplifier, second power amplifier; The output of the first reverse voltage amplifier connects the input of second power amplifier successively through first phase shifter, the second reverse voltage amplifier; Said first coupling transformer of output termination of said second power amplifier elementary, the elementary centre cap of first coupling transformer meets Vcc
1The said first reverse voltage amplifier is made up of operational amplifier IC6, resistance R 23-R24, potentiometer RW1; The output voltage U of said second comparator
XyOutput voltage U with said second current/voltage converter
xOne end of the branch road after the series connection connects negative input 2 pin of operational amplifier IC6, the other end ground connection of branch road through resistance R 23; Resistance R 24 is connected between positive input 3 pin and ground of operational amplifier IC6, and potentiometer RW1 is connected between 6 pin and 2 pin of operational amplifier IC6; Said first phase shifter is made up of operational amplifier IC7, resistance R 25-R26, potentiometer RW2, capacitor C 2; Negative input 2 pin of operational amplifier IC7 connect output 6 pin of operational amplifier IC6 through resistance R 25; Capacitor C 2 be connected between output 6 pin and ground of operational amplifier IC6 after potentiometer RW2 connects; The end ground connection of potentiometer RW2, positive input 3 pin of operational amplifier IC7 connect the node of capacitor C 2 and potentiometer RW2; Resistance R 26 is connected between 6 pin and 2 pin of operational amplifier IC7; The said second reverse voltage amplifier is made up of operational amplifier IC8, resistance R 27-R28, potentiometer RW3; Negative input 2 pin of operational amplifier IC8 connect output 6 pin of operational amplifier IC7 through resistance R 27, and resistance R 28 is connected between positive input 3 pin and ground of operational amplifier IC8, and potentiometer RW3 is connected between 6 pin and 2 pin of operational amplifier IC8; Said second power amplifier is the push-pull amplifier of being made up of transistor Q3-Q4, the 3rd coupling transformer T5, resistance R 29-R31; The 3rd coupling transformer T5 elementary is connected between output 6 pin and ground of operational amplifier IC8; The secondary base stage that meets transistor Q3 and transistor Q4 respectively of the 3rd coupling transformer T5, the centre cap of T5 level of the 3rd coupling transformer meets Vcc through resistance R 29 and resistance R 30 respectively
1And ground; The emitter parallel connection of transistor Q3 and transistor Q4 is after resistance R 31 ground connection; The collector electrode of transistor Q3 and transistor Q4 connects the elementary of said first coupling transformer respectively, and the elementary centre cap of said first coupling transformer meets Vcc
1, the branch road parallel connection of forming after the elementary L1 secondary and by load summation current transformer T4 of said first coupling transformer connects;
Be provided with the 3rd reverse voltage amplifier that is used for the compensating reactive power electric current in said second comparator, said the 3rd reverse voltage amplifier is made up of operational amplifier IC4, resistance R 17-R19; Negative input 2 pin of operational amplifier IC4 connect output 6 pin of operational amplifier IC3 through resistance R 17, and resistance R 18 is connected between positive input 3 pin and ground of operational amplifier IC4, and resistance R 19 is connected between 6 pin and 2 pin of operational amplifier IC4; The output voltage of operational amplifier IC4 is Uxy
2Also be provided with second phase shifter that is used to suppress harmonic current in said second comparator, said second phase shifter is made up of operational amplifier IC5, resistance R 20-R21, potentiometer RW4, capacitor C 1; Negative input 2 pin of operational amplifier IC5 connect output 6 pin of operational amplifier IC4 through resistance R 20; Capacitor C 1 be connected between output 6 pin and ground of operational amplifier IC4 after potentiometer RW4 connects; The end ground connection of potentiometer RW4; The node of capacitor C 1 and potentiometer RW4 connects positive input 3 pin of operational amplifier IC5, and resistance R 21 is connected between output 6 pin and 2 pin of operational amplifier IC5; The output voltage of operational amplifier IC5 is Uxy.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101814634A CN101834441B (en) | 2010-05-25 | 2010-05-25 | User power supply voltage and load current control device working according to electric network requirements and user need |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101814634A CN101834441B (en) | 2010-05-25 | 2010-05-25 | User power supply voltage and load current control device working according to electric network requirements and user need |
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| CN101834441B true CN101834441B (en) | 2012-12-12 |
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| CN1404196A (en) * | 2002-10-16 | 2003-03-19 | 武汉大学 | Harmonic, reactive and negative sequence comprehensive control method and device for complicated power system |
| CN101247046A (en) * | 2007-12-19 | 2008-08-20 | 湖南大学 | Harmonic dynamic control and reactive power dynamic compensation compound control method and its realization device |
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| CN1404196A (en) * | 2002-10-16 | 2003-03-19 | 武汉大学 | Harmonic, reactive and negative sequence comprehensive control method and device for complicated power system |
| CN101247046A (en) * | 2007-12-19 | 2008-08-20 | 湖南大学 | Harmonic dynamic control and reactive power dynamic compensation compound control method and its realization device |
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