CN107394793A - A kind of method of high frequency ozone generator capacitive load reactive-load compensation - Google Patents
A kind of method of high frequency ozone generator capacitive load reactive-load compensation Download PDFInfo
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- CN107394793A CN107394793A CN201710599076.4A CN201710599076A CN107394793A CN 107394793 A CN107394793 A CN 107394793A CN 201710599076 A CN201710599076 A CN 201710599076A CN 107394793 A CN107394793 A CN 107394793A
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- load
- reactive
- reactor
- ozone generator
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
-
- 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
Abstract
The invention discloses a kind of method of high frequency ozone generator capacitive load reactive-load compensation.As shown in Figure of abstract dotted line frame, this method refers to that C is air-gap capacitance C in ozone generator capacitive load C both ends parallel connection air gap REgulatable reactorsgWith dielectric capacitance CdSeries equivalent capacitance.The purpose of design air gap REgulatable reactor is to carry out reactive-load compensation to the capacitive load of capacitance dynamic change.The present invention is zero condition design reactor according to load two-port network imaginary impedance and leaves air gap in reactor magnetic circuit, it is successfully realized reactive-load compensation, and by changing reactor inductance value Optimal Reactive Power compensation effect, the results showed that power supply output capacity reduces 53%；The power factor of complete machine has brought up to 0.94 by 0.88；System components temperature rise reduces, and buffering electric capacity temperature rise reduces 40 DEG C, and active loss is reduced.Significantly improve the performance of high frequency ozone generator.
Description
Technical field
The present invention relates to ozone generator technical field, more particularly to a kind of idle benefit of high frequency ozone generator capacitive load
The method repaid.
Background technology
Ozone technology is lived in health of people, industrial production and is curbed environmental pollution etc. and to be play key player,
The demand of large-scale ozone generator is increased increasingly in recent years.Scholars study reactive-load compensation more in power train commander at present
Domain, reactive-load compensation have reduction network loss in power system, improve node voltage quality, improve the significances such as power factor.
Scholars design series resonance high frequency inverter using the advantages of series resonance voltage easy starting of oscillation, from soft switch technique, reduce
Harmonic wave, working frequency and resonant frequency relation, reduction switching tube loss etc. are started with and improve ozone generator performance, although one
Determine degree and improve electric energy transmission efficiency, but also carry over transformer heating, the problems such as how complete machine power factor improves.It is right
In the capacitive loads such as neon light, fluorescent lamp are low there is also power factor the problem of.Document on capacitive load reactive-load compensation is situated between
Continue few, especially high frequency ozone generator capacitive load reactive-load compensation introduction there is not yet, the advantage of high frequency is, relatively
Discharge cell unit area injecting power is larger under the conditions of power frequency, thus small volume, and power transformer volume is also small, ozone production
Raw efficiency high.
Required power transformer capacity is smaller during small sized high frequency ozone generator normal work, and stable performance, it is not necessary to
Extra increase cost shunt reactor.But with the increase of discharge cell quantity, under high frequency condition, while discharge power increase,
Load capacity current is consequently increased, and power supply and transformer output capacity are increased with higher magnitude so that design cost improves.Compared with
A high proportion of reactive power virtually adds burden to power supply and transformer, reduces complete machine power factor, and system temperature rise increases
Add.It is therefore, significant using development of the reactive-load compensation reduction power transformer output capacity to large-scale ozone generator,
It is that researcher has to consider.
The problem of present invention increases for power transformer output capacity, and system temperature rise is increased, and power factor reduces, calmly
Property loaded work piece when the analysis of active and reactive component set out, take on the basis of series resonance, shunt compensation reactor carries out nothing
The method of work(compensation, realize to capacitive load reactive-load compensation, reduce power supply and transformer output capacity, reduce system temperature rise, carry
The target of high complete machine power factor.
The content of the invention
Present invention aims at, it is big for above-mentioned capacitive load reactive component, cause power transformer output capacity to increase,
The problem of temperature rise is increased, and complete machine power factor reduces, the method for proposing air gap REgulatable reactor in parallel, this method is to capacitive load
Reactive-load compensation is carried out, and then reduces the capacitive component in the output current of transformer and commutation inversion power supply, mitigates power supply and change
The heat condition of depressor, improve the target of complete machine power factor.
To achieve the above object, reactive-load compensation, its reactor are carried out to capacitive load using air gap REgulatable reactor in parallel
Inductance L calculated values, meet with lower part：
Wherein, CdFor dielectric capacitance, R is equivalent resistance when capacitive load works, and ω=2 π f, f are driving frequency.
Preferably, air gap is left in reactor magnetic circuit, the inductance of reactor is adjusted by changing the size of air gap
Value.
Preferably, reactive-load compensation effect is changed by adjusting inductance l values, by judging load branch electric current and reactor branch
Road electric current is equal or close, and then judges whether compensation effect is preferable.
Because ozone generator capacitive load has dynamic characteristic, capacitance changes before and after electric discharge, theoretical calculation inductance value
Reactive-load compensation effect and ideal effect have certain error, and ideal effect is unable to reach under physical condition.Inductance value size is straight
Connecing influences the output current and capacity of transformer；Grid side gives capacity and power factor.Judge whether inductance value properly mends
Repaying the whether preferable condition of effect is：Load branch electric current and Reactor Branch electric current it is equal or close to i.e. occur parallel resonance
Or current resonance.
Specifically：By theory analysis with calculating, design reactor L parameter.
Further, designed reactor is tested, verifies whether to realize the target of reactive-load compensation.
Further, because capacitive load has dynamic characteristic, so designed reactor inductance value is done further excellent
Change, adjust reactor inductance value by changing magnetic air gap so that reactive-load compensation effect is more preferable.
Further, by gathering the data after compensating, and data are handled.
Further, from power transformer output current and capacity；Power network is based on capacity and power factor；System temperature rise etc.
Parameter quantifies the effect of reactive-load compensation.
Beneficial effect：
1) shunt reactor serves good inactive power compensation, and transformer and power supply output capacity reduce, complete machine work(
Rate factor is improved.
2) after reactive-load compensation, transformer primary side, secondary total current reduce, transformer wire bag, IGBT, buffering electric capacity, lamination
Busbar temperature rise reduces.Thermal losses improves utilization rate of electrical while reduction.
In summary, ozone generator capacitive load shunt reactor realizes the effect of reactive-load compensation, reduces transformation
The output capacity of device and commutation inversion power supply, power supply and transformer temperature rise reduce substantially, improve complete machine power factor and electric energy
Utilization rate, ozone generator performance significantly improve.
Brief description of the drawings
Fig. 1 is prior art circuit of ozonator topological diagram.
Fig. 2 is the beautiful Sa of prior art such as graphical measurement method schematic diagram.
Fig. 3 is the beautiful Sa such as figure of prior art measurement.
The coordinate system that Fig. 4 is established by the beautiful Sa of prior art such as figure.
Fig. 5 is circuit of ozonator schematic diagram after shunt reactor of the embodiment of the present invention.
Fig. 6 is ozone generator load equivalent circuit diagram of the embodiment of the present invention.
Fig. 7 whether there is the contrast of reactor transformer secondary voltage current waveform when being L=75mH of the embodiment of the present invention.
Fig. 8 is the beautiful Sa such as figure of non-shunt reactor.
Fig. 9 is the beautiful Sa such as figure of shunt reactor of the embodiment of the present invention.
Figure 10 contrasts for the temperature rise of transformer primary secondary line bag of the embodiment of the present invention.
Figure 11 is IGBT of the embodiment of the present invention and the temperature rise contrast of buffering electric capacity.
Embodiment
For make present invention solves the technical problem that, the technical scheme that uses and the technique effect that reaches it is clearer, below
The present invention is described in further detail in conjunction with the accompanying drawings and embodiments.It is understood that specific implementation described herein
Example is used only for explaining the present invention, rather than limitation of the invention.It also should be noted that for the ease of description, accompanying drawing
In illustrate only part related to the present invention rather than full content.
A kind of method of high frequency ozone generator capacitive load reactive-load compensation provided by the invention, i.e. shunt reactor are to holding
Property load carry out reactive-load compensation.The theory analysis of ozone generator capacitive load reactive component is this method give, designs reactance
Device parameter simultaneously optimizes, the particular content of compensation result analysis.
(1) capacitive load reactive component is analyzed
Fig. 1 is the circuit theory diagrams of ozone generator, CdFor dielectric capacitance, CgFor air-gap capacitance, secondary electricity is kept in experiment
Press 8kV constant, measure：U2=5.5kV, I2=3.85A.Then transformer secondary output capacity is：
S2=U2I2=5.5 × 3.85=21.2kVA
Measurement for discharge power, the method for selecting beautiful Sa such as graphical measurement discharge power.Connected with reactor measurement
Electric capacity CM=1.15uF, f=8.7kHz.Fig. 2 is beautiful Sa such as graphical measurement method schematic diagram.
Beautiful Sa such as figure when measuring reactor normal work by Fig. 2, Fig. 3 are the beautiful Sa such as figure of measurement.
∮UdUMRepresent the area A of parallelogram.
P=fCM∮UdUM=fCMkxkyA
kx=2000, ky=20, area A's seeks the method that method uses vector product modulus.Fig. 4 is established by beautiful Sa such as figure
Coordinate system.
A=7.15 is calculated, discharge power during so as to calculate non-shunt reactor：
P=fCMkxkyA=8.7 × 103×1.15×10-6× 2000 × 20 × 7.15=2861W
Some thermal losses in addition to discharge power of secondary active power of output, active power of output are about 5kW,
And output capacity about 21kVA, so secondary power factor is relatively low, find that transformer secondary power factor exists by testing to accumulate
0.3 or so, thus it is idle occupy significant proportion, higher proportion is idle so that transformer capacity, commutation inversion device type selecting capacity
Increase, increase cost.Therefore, taking the method for shunt compensation reactor reduces transformer and power electronic devices output capacity.
(2) reactor parameter designing
After load balancing reactor in parallel, the circuit theory diagrams of ozone generator become shown in Fig. 5.It is equivalent during load discharge
Circuit is as shown in Figure 6.It is L that idle parameter is influenceed in load equivalent circuits, L, Cd.Ideally, in terms of transformer secondary
Two-port network impedance Z=the R to enterz+jXzOnly real part RzConsume active, and imaginary part XzIt is zero.
Wherein, ω=2 π f, f is driving frequency.Derive：
Make Xz=0 can derive：
This is a quadratic equation with one unknown ax2+ bx+c=0, L are unknown quantitys, wherein：
Ideally need to meet b2During -4ac >=0, equation has solution, just can be in the hope of L.In practice, because ozone is sent out
The load of raw device has dynamic characteristic, and load capacitance value is constantly changing；The important parameter leakage inductance L of transformersIn transformer
Different transformer L in the manufacturingsValue is different.Therefore, can in order to more easily realize the effect of reactive-load compensation in practical application
To make Ls=0, the adjustable reactor of air gap can be designed afterwards by trying to achieve L, and regulation air gap can change the inductance value of reactor
L, then to find suitable L values more convenient.
Ls=0 can obtain：
So as to derive：
C in this experimentd=11.5nF, R=2000 Ω, f=8.7kHz.It can calculate：L=75.1mH.Because matching
Reactor is connected in parallel on transformer secondary, normal working voltage virtual value 5.5kV.According to Ohm's law calculating reactance device operating current
And then determine reactor rated current.
In order that the work that reactor is steady in a long-term, the rated current that can select reactor is the 3- of running current
5 times, rated current can be set to I if choosing 4 timesN=5A.
(3) shunt compensation reactor L data comparisons
When the inductance value of reactor is L=75mH, transformer primary side and secondary current, Reactor Branch current value such as table
Shown in 1.Transformer secondary voltage max is that 8kv keeps constant.
Each branch current statistical forms of the L=75mH of table 1
Primary side current of transformer virtual value is reduced to 21.8A drops by 36.2A after shunt reactor as can be seen from Table 1
Low 39.8%, transformer secondary side current virtual value is reduced to 2.74A by 3.85A reduces 28.8%.When Fig. 7 is L=75mH
Whether there is the contrast of reactor transformer secondary voltage current waveform.
Left side figure is transformer secondary voltage and secondary total current waveform figure when being not powered on anti-device in Fig. 7, and right side is simultaneously
Oscillogram after connection reactor.By Fig. 7 contrasts it can be seen that after shunt reactor, current amplitude reduces.
(3) inductance value L is optimized
Change the inductance value observation transformer primary side and secondary current situation of change of reactor in experiment, find suitable electricity
Inductance value, make reactive-load compensation effect more preferable.Table 2 is change reactor inductance value, transformer primary side and secondary current virtual value
Situation of change.
The different induction value current values record sheet of table 2
Primary and secondary side current value is smaller during L=45mH as can be seen from Table 2, the Reactor Branch electric current as L=45mH
Virtual value is 2.55A, and reactor branch current virtual value is 2.81A, and the two has been closer to, this inductance value compensation effect reason
Think.After shunt reactor, transformer secondary diminishes with primary current, illustrates that shunt reactor serves the work of reactive-load compensation
With, while also improve the waveform of transformer secondary voltage x current.Change reactor inductance value, it is found that L values reduce transformer one
Secondary current value also reduces, and illustrates that reactive-load compensation increases.Reactor after adjustment inductance value is further analyzed, quantified
The effect of reactive-load compensation, carry out System Reactive Power Compensation Analysis.
(4) data pair of secondary voltage virtual value and current effective value when transformer secondary compensation result table 3 is L=45mH
Than.
The transformer secondary voltage x current data comparison table of table 3
| Voltage effective value | Current effective value | |
| Without reactor | 5.5kv | 3.85A |
| There is reactor | 4.97kv | 1.97A |
Secondary voltage keeps maximum 8kv constant, during non-shunt reactor, transformer output capacity：
S2=U2I2=5.5 × 3.85=21.18kVA
Transformer output capacity after shunt reactor：
S2'=U2′I2'=4.97 × 1.97=9.79kVA
Output capacity reduces before and after parallel connection：
Formula P=fCMkxkyReactor discharge power when A=2861W has calculated non-shunt reactor, Fig. 3 are electricity not in parallel
Beautiful Sa such as figure during anti-device, it is in parallel before and after Li Sa such as graphic correlations as shown in Figure 8 and Figure 9.According to Fig. 9 and formula A=| (x2-x1)
(y4-y1)-(x4-x1)(y2-y1) | calculate the beautiful Sa such as graphics area after shunt reactor：A '=7.18
Then the discharge power of the post-reactor of shunt reactor is：
P '=fCMkxkyA '=8.7 × 103×1.15×10-6× 2000 × 20 × 7.18=2873W
It can be seen that P ≈ P ', whether there is shunt reactor reactor discharge power and are basically unchanged.
The output capacity of transformer secondary reduces 53.8% under conditions of the discharge power of reactor is constant.
(5) transformer primary side compensation result
Transformer secondary total current value reduces, according to I1=nI2It can be inferred that primary side current of transformer value can also reduce,
Ideally primary current value changes amount is n times of secondary current value changes amount.Table 4 is primary voltage of transformer current data
Contrast table.
The primary voltage of transformer current data contrast table of table 4
| Voltage effective value | Current effective value | |
| Without reactor | 585v | 36.2A |
| There is reactor | 545v | 18.5A |
Primary current virtual value is calculated by table 4 and reduces 17.7A.
Transformer primary side capacity is during non-shunt reactor：
S1=U1I1=585 × 36.2=21.18kVA
Transformer primary edge capacity is after shunt reactor：
S1'=U1′I1'=545 × 18.5=10.08kVA
Capacity reduces before and after parallel connection：
The capacity of transformer primary side reduces 52.4%, illustrates to be also reduced by the capacity of commutation inversion output original defeated
Go out the half of capacity.
(6) grid side compensation result
Transformer primary side and secondary current may infer that the energy that variable-frequency power sources obtains from grid side there occurs obvious change
Amount can also change, and the change of the three-phase voltage and three-phase current of grid side is mainly manifested in, due to finding power network in measurement
There is the phenomenon of three-phase imbalance side, therefore the voltage of each phase of independent measurement and electric current are analyzed.Table 5 is grid side voltage electricity
Flow data contrast table.
The grid side voltage x current data comparison of table 5
Shunt compensation reactor parameter comparison is as follows：
Grid side gives active power：
PThree-phase=PA+PB+PC=1180+840+1260=3280W
PThree-phase'=PA′+PB′+PC'=1000+820+1100=2920W
Three-phase activity coefficient：
Three phase reactive power：
QA=627.94Var QB=484.08Var QC=695.06Var
QA'=220.86Var QB'=437.16Var QC'=423.34Var
The reactive power that grid side is given：
QThree-phase=QA+QB+QC=1807.08Var
QThree-phase'=QA′+QB′+QC'=1081.36Var
The power factor of grid side：
Find out that the apparent energy obtained after shunt reactor from grid side reduces 631VA by calculating, active power subtracts
Small 360W, power factor have brought up to 0.94 from 0.88, improve 6.8%, reactive-load compensation significant effect.
(7) reactive-load compensation and system temperature rise relation
Transformer secondary shunt reactor, serves the effect of reactive-load compensation, and the reactive current in discharge reactor is occupied
Larger proportion, after shunt reactor, there occurs energy exchange between reactor and reactor so that transformer secondary energy
Output reduces, and total current reduces.Secondary current reduces, according to Δ I1=n Δs I2, primary current can be obviously reduced.Because electric current subtracts
Small, the temperature rise of transformer secondary line bag, the temperature rise of primary side line bag, the temperature rise of commutation inversion part also can accordingly reduce.Figure 10, Tu11Wei
When whetheing there is shunt reactor, system components temperature rise contrast.The temperature rise of Figure 10 transformer primary secondary line bags contrasts；Figure 11 be IGBT and
Buffer electric capacity temperature rise contrast.After ozone generator works for two and a half hours, the temperature rise of transformer basically reaches stable state, secondary
Sideline bag temperature reduces 3 DEG C after shunt reactor.Because current amplitude reduction is larger, temperature rise reduces also compares primary side line bag
Substantially, 10 DEG C are reduced.
After shunt reactor, primary side current of transformer amplitude reduces 48.9%, flows through IGBT current reduction, IGBT
Temperature rise reduces.IGBT current amplitudes reduce after shunt reactor, have also shared " pressure " of buffering electric capacity, buffer the temperature of electric capacity
Rise and reduce 40 DEG C or so, reactive-load compensation not only reduces IGBT type selectings capacity and improves IGBT with buffering electric capacity work
Stability.
A kind of method of high frequency ozone generator reactive-load compensation of the present embodiment, from the parameter designing of reactor, theory analysis,
Calculate, the experiment proved that reactive-load compensation positive effect, be determined reactive-load compensation ideal by the optimization to inductance value
Inductance value.Power supply, the reduction of transformer output capacity, system temperature rise reduction are successfully realized, the energy obtained from power network is reduced, whole
The target that acc power factor and utilization rate of electrical improve.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
The present invention is described in detail with reference to foregoing embodiments, it will be understood by those within the art that：It is to preceding
State the technical scheme described in each embodiment to modify, either which part or all technical characteristic are equally replaced
Change, the essence of appropriate technical solution is departed from the scope of various embodiments of the present invention technical scheme.
Claims (4)
- A kind of 1. method of high frequency ozone generator capacitive load reactive-load compensation, it is characterised in that use air gap adjustable electric in parallel Anti- device carries out reactive-load compensation to dynamic capacitive load.
- A kind of 2. method of high frequency ozone generator capacitive load reactive-load compensation according to claim 1, it is characterised in that The Theoretical Design value of reactor meets following condition：<mrow> <mi>L</mi> <mo>=</mo> <msub> <mi>C</mi> <mi>d</mi> </msub> <mrow> <mo>(</mo> <msup> <mi>R</mi> <mn>2</mn> </msup> <mo>+</mo> <mfrac> <mn>1</mn> <mrow> <msup> <mi>&omega;</mi> <mn>2</mn> </msup> <msup> <msub> <mi>C</mi> <mi>d</mi> </msub> <mn>2</mn> </msup> </mrow> </mfrac> <mo>)</mo> </mrow> </mrow>Wherein, CdFor dielectric capacitance, R is equivalent resistance when capacitive load works, and ω=2 π f, f are driving frequency.
- A kind of 3. method of high frequency ozone generator capacitive load reactive-load compensation according to claim 1, it is characterised in that Change reactor inductance value change reactive-load compensation effect by adjusting reactor magnetic air gap on the basis of theoretical design load L.
- A kind of 4. method of high frequency ozone generator capacitive load reactive-load compensation according to claim 3, it is characterised in that Adjust inductance value and change reactive-load compensation effect, by judging that load branch electric current and Reactor Branch electric current are equal or close, And then judge whether compensation effect is preferable.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113067417A (en) * | 2021-04-20 | 2021-07-02 | 重庆大学 | Reactive compensation-based power-taking CT output power improving method |
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|---|---|---|---|---|
| US4680686A (en) * | 1984-12-28 | 1987-07-14 | Trailigaz "Cie Generale De L'ozone" | Electric 3-phase supply device for an ozonizer |
| JP2003180082A (en) * | 2001-12-11 | 2003-06-27 | Mitsubishi Electric Corp | Ozone generation device |
| US20070205727A1 (en) * | 2004-03-29 | 2007-09-06 | Mitsubishi Electric Corporation | Plasma-generation power-supply device |
| CN105244152A (en) * | 2015-10-28 | 2016-01-13 | 南京南瑞集团公司 | Mixedly adjusting type adjustable reactor |
| US20160234922A1 (en) * | 2013-10-04 | 2016-08-11 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Power supply apparatus |
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- 2017-07-21 CN CN201710599076.4A patent/CN107394793A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4680686A (en) * | 1984-12-28 | 1987-07-14 | Trailigaz "Cie Generale De L'ozone" | Electric 3-phase supply device for an ozonizer |
| JP2003180082A (en) * | 2001-12-11 | 2003-06-27 | Mitsubishi Electric Corp | Ozone generation device |
| US20070205727A1 (en) * | 2004-03-29 | 2007-09-06 | Mitsubishi Electric Corporation | Plasma-generation power-supply device |
| US20160234922A1 (en) * | 2013-10-04 | 2016-08-11 | Toshiba Mitsubishi-Electric Industrial Systems Corporation | Power supply apparatus |
| CN105244152A (en) * | 2015-10-28 | 2016-01-13 | 南京南瑞集团公司 | Mixedly adjusting type adjustable reactor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113067417A (en) * | 2021-04-20 | 2021-07-02 | 重庆大学 | Reactive compensation-based power-taking CT output power improving method |
| CN113067417B (en) * | 2021-04-20 | 2022-11-08 | 重庆大学 | Reactive compensation-based power-taking CT output power improving method |
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