CN106786635A - A kind of operation/cutting method of reactive-load compensator - Google Patents
A kind of operation/cutting method of reactive-load compensator Download PDFInfo
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- CN106786635A CN106786635A CN201510809646.9A CN201510809646A CN106786635A CN 106786635 A CN106786635 A CN 106786635A CN 201510809646 A CN201510809646 A CN 201510809646A CN 106786635 A CN106786635 A CN 106786635A
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- load compensator
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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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Abstract
The invention discloses a kind of operation/cutting method of reactive-load compensator, including：Measurement bus inlet wire current in setting time compartment, judges that whether the value of the bus inlet wire current, more than first threshold, is have motor operation in bus, without motor operation otherwise in bus, cuts off reactive-load compensator；In the case where there is motor operation, the bus inlet wire current in continuous two time intervals is measured, judge whether the change of bus inlet wire current exceedes Second Threshold, without electric motor starting otherwise in bus, keep reactive-load compensator to access；It is have electric motor starting in bus, calculates the total power factor in the loop outside reactive-load compensator；Whether total power factor is judged more than the 3rd threshold value, is then to keep reactive-load compensator to access, otherwise cut off reactive-load compensator.The present invention controls the switching of SVC, so as to avoid the generation of parallel resonance by real-time detection bus inlet wire current, reactive-load compensator electric current and busbar voltage, the total power factor of computational load.
Description
Technical field
The present invention relates to a kind of electric device maintenance technical field, especially, it is related to a kind of idle
The operation/cutting method of compensator.
Background technology
Reactive-load compensation plays very important effect in electrical power trans mission/distribution system, and it can reduce transformation
Device and electric line are lost, and improve power supplying efficiency, reduce the design capacity of controller switching equipment to subtract
Few investment, improves power supply quality.Reactive-load compensation can be divided into by its installation site：Centralized compensation,
Local compensation.There is substantial portion of reactive power consumption in low-voltage network in asynchronous motor
On, therefore, the reactive-load compensation of asynchronous motor is realized, make its idle in-situ balancing, can subtract
The loss of few distribution line, while exerting oneself for motor can also be improved, with good economy
Benefit.
SVC, abbreviation SVC, both including fixed switched capacitor, fixed switching
Reactor, also including IGCT control switched capacitor, IGCT control switching reactor.It is logical
Cross and the operational application of motor local compensation is found, when SVC is capacity cell, in electricity
When motivation starts, parallel resonance is susceptible to, increases the electric current for flowing through SVC and motor,
Burn out motor or SVC.
Parallel resonance is that in electric capacity, inductance in parallel circuit, circuit terminal voltage and total current occur
The phenomenon of same-phase.During resonance, the total current of circuit is minimum, and branch current is commonly greater than electricity
Total current in road, therefore, parallel resonance is also current resonance.Motor starting current is general
It is 3~7 times of rated current, parallel resonance is further exaggerated the starting current of motor, makes
The electric current for flowing through motor and capacitor exceeds well over the ability to bear of equipment so that burning apparatus.
Transformer belt multiple electric motors and capacitor run, wherein a motor (motor 1) starts
When electromechanical model as shown in figure 1, the equivalent resistance for setting all grid-connected motors is R, equivalent reactance
It is XL, it is the schematic form of parallel resonance by Fig. 1 letters, i.e., as shown in Fig. 2 can be with from Fig. 2
See, when certain electric motor starting, the total equivalent resistance of motor and equivalent reactance are variable.
Although current capacitor can be from motion tracking motor power (output) when being controlled automatically at motor start-up
The change of factor and compensate automatically, but its pace of change is slower in relative motor start-up procedure, this
Exacerbate XL=XCPossibility, that is, occur parallel resonance possibility increase.Once occur
Parallel resonance, it will usually cause motor or capacitor, controller switching equipment to burn, bring more
Great loss.
The content of the invention
In view of the shortcomings of the prior art, the present invention provides a kind of operation/cutting method of reactive-load compensator.
By real-time detection bus inlet wire current, reactive-load compensator electric current and busbar voltage, computational load
Total power factor, control SVC switching, so as to avoid the hair of parallel resonance
It is raw.
To realize above-mentioned goal of the invention, the invention provides a kind of throwing of SVC
Blanking method, it is characterised in that including：
S1, measurement bus inlet wire current in setting time compartment, judge the bus inlet wire electricity
Whether the value of stream is more than first threshold, is to judge there is motor operation in bus, otherwise judges institute
State without motor operation in bus, cut off reactive-load compensator；
S2, in the case where there is motor operation, the bus measured in continuous two time intervals enters
Line current, judges whether the change of the bus inlet wire current in continuous two time intervals surpasses
The Second Threshold of setting is crossed, otherwise judges, without electric motor starting in the bus, to keep reactive-load compensation
Device is accessed；To judge there is electric motor starting in the bus, measure current bus inlet wire current,
Reactive-load compensator electric current and busbar voltage, calculate the total work in the loop outside the reactive-load compensator
Rate factor；
S3, judge the total power factor whether exceed setting the 3rd threshold value, be to keep institute
Reactive-load compensator access is stated, the reactive-load compensator is otherwise cut off.
Wherein, the first threshold is set as that capacity in each motor for be connected to bus is minimum
The inlet wire current value of bus during motor operation.
Wherein, the Second Threshold changes with time according to bus with each electric motor starting electric current
Curve setting.
Wherein, the current motor general power factor is calculated as：
When there is electric motor starting, the current bus inlet wire current is measuredReactive-load compensator electricity
StreamWith current busbar voltageCalculate motor total power factor
Wherein, the 3rd threshold value is set as 0.707, whenWhen, by idle benefit
Repay device excision；WhenWhen, keep reactive-load compensator input.
A kind of reactive-load compensator operation/cutting method that the present invention is provided, can cut off nothing when bus is unloaded
Work(compensator, can avoid electric motor starting in parallel with SVC generation in bus underloading
Resonance, prevents from flowing through the current surge of motor and reactive-load compensator, protects motor and reactive-load compensation
Device.The method need to only measure two current signals and a voltage signal, and measurement is simple, algorithm
Simplicity, judges that reliability is high, it is easy to accomplish.
Brief description of the drawings
Fig. 1 shows electricity when transformer belt multiple electric motors in the prior art and capacitance operation
Motor model schematic diagram when machine starts
Fig. 2 shows the equivalent circuit diagram of all grid-connected motors in the prior art.
Fig. 3 is the operation/cutting method flow chart of the reactive-load compensator of the embodiment of the present invention.
Idle benefit when Fig. 4 is single transformer band multiple motors and reactive-load compensator of the invention
Repay the control structure figure of device.
Fig. 5 is the schematic diagram that motor starting current of the invention is changed over time.
Specific embodiment
Below in conjunction with the accompanying drawings, specific embodiment of the invention is described in further detail.With
Lower embodiment is used to illustrate the present invention, but is not limited to the scope of the present invention.
In one embodiment of the present of invention, there is provided a kind of operation/cutting method of SVC,
It is characterised in that it includes：
S1, measurement bus inlet wire current in setting time compartment, judge the bus inlet wire electricity
Whether the value of stream is more than first threshold, is to judge there is motor operation in bus, otherwise judges institute
State without motor operation in bus, cut off reactive-load compensator；
S2, in the case where there is motor operation, the bus measured in continuous two time intervals enters
Line current, judges whether the change of the bus inlet wire current in continuous two time intervals surpasses
The Second Threshold of setting is crossed, otherwise judges, without electric motor starting in the bus, to keep reactive-load compensation
Device is accessed；To judge there is electric motor starting in the bus, measure current bus inlet wire current,
Reactive-load compensator electric current and busbar voltage, calculate the total work in the loop outside the reactive-load compensator
Rate factor；
S3, judge the total power factor whether exceed setting the 3rd threshold value, be to keep institute
Reactive-load compensator access is stated, the reactive-load compensator is otherwise cut off.
Fig. 3 is the operation/cutting method flow chart of the reactive-load compensator of the embodiment of the present invention.
In a specific embodiment, as shown in figure 3, specifically, the process of the above method
For：
Step S11, sets K1And K2Value, first threshold K1Be bus institute with each motor hold
Measure the electric current of bus inlet wire when minimum motor separate unit runs；Second Threshold K2According to bus institute
With the setting of each electric motor starting electric current versus time curve.
Step S22, at interval of Δ t time measurement bus inlet wire currents, and sets sequentially in time
It is set to I1、I2。
In step S33, judge whether translator runs bus according to bus inlet wire current.
When bus inlet wire current is less than first threshold K1When, judgement is incorporated into the power networks without motor, idle
Compensator cuts off.When bus inlet wire current is more than first threshold K1When, judge one or more electricity
Machine is incorporated into the power networks.
In step S44, the change according to bus inlet wire current determines whether electric motor starting.
Usually, choose each motor speed and be less than 0.75 times of rated speed (n≤0.75nN), when
Between at intervals of Δ t when minimum value.
Electric current is more than setting value K in Δ t1And I1-I2<K2When, judge that motor stablizes fortune
OK, reactive-load compensator input.Electric current is more than setting value K in Δ t1And I1-I2≥K2When, sentence
Power machine starts.
S55, reactive-load compensator cuts off or throws when judging electric motor starting according to motor total power factor
Enter.
As shown in Fig. 2 parallel resonance frequency such as following formula：
If guarantee does not occur parallel resonance necessarily, loop parallel resistance is more than damping value：
I.e.
Under normal circumstances, XL<XC, during parallel resonance, XL=XC.Above formula is arranged to obtain：
R>XL
If guarantee does not occur parallel resonance necessarily, the total power factor of load circuit should
That is, in order to ensure parallel resonance, the general power factor of load circuit should be less than
Above-mentioned calculated value 0.707, therefore the 3rd threshold value is set as 0.707.
When there is electric motor starting, the current bus inlet wire current is measuredReactive-load compensator electricity
StreamWith current busbar voltageCalculate motor total power factor
Wherein, the 3rd threshold value is set as 0.707, whenWhen, by idle benefit
Repay device excision；WhenWhen, keep reactive-load compensator input.
Fig. 4 be single transformer with multiple motors and during reactive-load compensator reactive-load compensator control
Structure chart processed.
In industrial enterprise, transformer is through one or more motor running of bus belt.Such as Fig. 4
It show transformer T band multiple motors M operations.In the low-pressure side of transformer, nothing is installed additional
Work(compensator, reactive-load compensator is usually capacitive character, may be with the equivalent inductance of asynchronous motor
Generation parallel resonance.This method detects bus inlet wire current I＆, idle by current transformer TA
Compensator electric currentBusbar voltage is detected by voltage transformer TVController is according to setting
Fixed control strategy controlling switch S, so as to control the switching of capacitor C.
Fig. 5 is the schematic diagram that motor starting current of the invention is changed over time.
As shown in figure 5, when without motor operation, current amplitude is less than setting value K1.When one
Or during multiple electric motors startup, current amplitude is raised rapidly, and gradually decrease up to stabilization.Electric current
The process of amplitude reduction is exactly the process of electric motor starting, by rationally setting Δ t and K2, can be accurate
Really judge whether electric motor starting.
In sum, the operation/cutting method of the reactive-load compensator that the present invention is provided, only need to measure two
Current signal and a voltage signal, measurement are simple, and algorithm is easy, judges that reliability is high, easily
In realization.The method can cut off reactive-load compensator when bus is unloaded, can be kept away in electric motor starting
Exempt from motor and parallel resonance occurs with SVC, prevent from flowing through motor and reactive-load compensator
Current surge, protect motor and reactive-load compensator.
Embodiment of above is merely to illustrate the present invention, and not limitation of the present invention, it is relevant
The those of ordinary skill of technical field, without departing from the spirit and scope of the present invention,
Can also make a variety of changes and modification, therefore all equivalent technical schemes fall within the present invention
Category, scope of patent protection of the invention should be defined by the claims.
Claims (5)
1. a kind of operation/cutting method of reactive-load compensator, it is characterised in that including：
S1, measurement bus inlet wire current in setting time compartment, judge that whether the value of the bus inlet wire current, more than first threshold, is to judge there is motor operation in bus, otherwise judge in the bus without motor operation, excision reactive-load compensator；
S2, in the case where there is motor operation, measure the bus inlet wire current in continuous two time intervals, judge whether the change of the bus inlet wire current in continuous two time intervals exceedes the Second Threshold of setting, otherwise judge to be accessed without electric motor starting, holding reactive-load compensator in the bus；It is to judge there is electric motor starting in the bus, measures current bus inlet wire current, reactive-load compensator electric current and busbar voltage, calculates the total power factor in the loop outside the reactive-load compensator；
S3, judge whether the total power factor exceedes the 3rd threshold value of setting, be to keep the reactive-load compensator to access, otherwise cut off the reactive-load compensator.
2. the operation/cutting method of reactive-load compensator as claimed in claim 1, it is characterised in that
The first threshold is set as the inlet wire current value of bus during the motor operation of capacity minimum in each motor for be connected to bus.
3. the operation/cutting method of reactive-load compensator as claimed in claim 1, it is characterised in that
The Second Threshold is according to bus institute with the setting of each electric motor starting electric current versus time curve.
4. the operation/cutting method of reactive-load compensator as claimed in claim 1, it is characterised in that the current motor general power factor is calculated as：
When there is electric motor starting, the current bus inlet wire current is measuredReactive-load compensator electric currentWith current busbar voltageCalculate motor total power factor
。
5. the operation/cutting method of reactive-load compensator as claimed in claim 2, it is characterised in that the 3rd threshold value is set as 0.707, whenWhen, reactive-load compensator is cut off；WhenWhen, keep reactive-load compensator input.
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| CN201510809646.9A CN106786635B (en) | 2015-11-19 | 2015-11-19 | A kind of operation/cutting method of reactive-load compensator |
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| CN201510809646.9A CN106786635B (en) | 2015-11-19 | 2015-11-19 | A kind of operation/cutting method of reactive-load compensator |
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| CN106786635B CN106786635B (en) | 2019-04-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113328450A (en) * | 2020-12-28 | 2021-08-31 | 青岛鼎信通讯股份有限公司 | Start-stop bus compensation method for tail end low voltage treatment device |
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| CN1881730A (en) * | 2006-05-17 | 2006-12-20 | 西安汇丰电力设备有限公司 | Method for low-voltage connecting reactive-load compensation device and active filtering device by electrolysis system transformer |
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| CN104538975A (en) * | 2014-12-26 | 2015-04-22 | 西安爱科赛博电气股份有限公司 | Reactive compensation method and device having transformer reactive current real-time compensation function |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1881730A (en) * | 2006-05-17 | 2006-12-20 | 西安汇丰电力设备有限公司 | Method for low-voltage connecting reactive-load compensation device and active filtering device by electrolysis system transformer |
| CN102545221A (en) * | 2011-04-06 | 2012-07-04 | 上海华盾石油工程技术有限公司 | Full-active dynamic harmonic suppression and reactive compensation system used for direct current motor-driven drilling machines |
| CN202034780U (en) * | 2011-04-18 | 2011-11-09 | 童淮安 | 110kV filter compensation energy-saving set device |
| CN102593848A (en) * | 2012-03-15 | 2012-07-18 | 东营爱特机电技术有限责任公司 | APF and TSF hybrid compensation device for electric rig |
| CN103762604A (en) * | 2014-01-02 | 2014-04-30 | 江苏中联电气股份有限公司 | Mining power compensation device |
| CN104538975A (en) * | 2014-12-26 | 2015-04-22 | 西安爱科赛博电气股份有限公司 | Reactive compensation method and device having transformer reactive current real-time compensation function |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113328450A (en) * | 2020-12-28 | 2021-08-31 | 青岛鼎信通讯股份有限公司 | Start-stop bus compensation method for tail end low voltage treatment device |
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